Scientific Program

Conference Series Ltd invites all the participants across the globe to attend 4th European Chemistry Congress Barcelona, Spain.

Day 2 :

  • Physical Chemistry
    Biological Chemistry
    Environmental Chemistry
    Theoretical Chemistry
    Materials Chemistry

Session Introduction

Victor V. Zhirnov

Institute of Bioorganic Chemistry and Petrochemistry, Ukraine

Title: Influence of low rate β-radiation (90Sr/90Y) on transmembrane electron transport in human erythrocytes
Biography:

Institute of Bioorganic Chemistry and Petrochemistry, Ukraine

Abstract:

Protection against the reactive species generated during oxidative stress is probably main role of transmembrane electron transport (tMET). Membrane redox systems transfer electrons across the plasma membrane, resulting in the net reduction of extracellular oxidants. The low rate ionizing radiation changes of spatial organization of lipid-protein complexes of erythrocyte membranes. It can induce fluctuating of activity membrane-bound proteins. Therefore influence of low dose rate ionizing radiation on tMET in human erythrocytes was studied.

Erythrocyte tMET activity was determined by using extracellular ferricyanide as an electron acceptor. Release of ferrocyanide was measured by formation of ferrous bathophenanthroline disulfonate. The irradiation of erythrocyte suspensions carried out by applying suitable aliquots of 90Sr/90Y in incubation media.

An essential decrease the ferricyanide reductase activity (12-25%) of human erythrocytes under the radiation field with a dose rate of 100.0 µGy×h-1was observed. Phenilephrine, a selective a1-adrenoreceptor agonist, in PBS did not influence on basal activity of the ferricyanide reductase activity, and did not change substantially the effect of the ionizing field at all dose rates investigated (1.0-100 μGy∙h-1). However, phenilephrine in Krebs-Henseleit bicarbonate buffer decreased the ferricyanide reductase activity relative to control whereas the radiation field (10 µGy∙h-1) did not influence on this activity. On the contrary, naftopidil, selective α1-adrenergic receptor antagonist, in Krebs-Henseleit bicarbonate buffer increased the ferricyanide reductase activity relative to control (to24%), and the radiation field strengthened its effect up to 58%.

The findings indicate that the low dose rate ionizing field modifies cellular signaling regulating the reductase activity of erythrocyte membrane. A direction of that modification presumably depends on the initial structure of membranes, and it is determined by the quality and quantitative parameters of changes in membrane structure caused by concrete operable factors. These findings denote the necessity for monitoring of absorbed doses of ionizing radiation at the use of radionuclides in biochemical investigations of membrane bound enzymes, and signal system components.

Biography:

Simon Korte has gained his bachelor degree in chemical engineering and his master degree, specialising on material science, at the University of Applied Science Münster. Subsequently he started his PhD studies at the University of Applied Science Münster and does his research on “luminescent materials for flicker reduction of AC-LEDs“ in the working group of Prof. Thomas Jüstel.

Abstract:

AC driven LEDs show very high wall plug efficiency combined with a good colour rendering and long-term stability. For general lighting, LEDs have surpassed the traditional incandescent and fluorescent lamps years ago. (1) However, LEDs still have a tremendous drawback, which is known as flicker. Perceived flicker is caused by the time dependant variation of the luminous intensity of a light source. The consequences for humans under such illumination situations expand from headaches to neurological problems, even including epileptic seizure (2).

Since many research activities in this field are conducted to solve or to reduce problems accompanied by flicker, we came up with a possible solution to it. Since the zero point of an AC current cannot be turned out completely, the solution must be based on the used conversion layer (mostly a phosphor particle or ceramic layer) or a combination of a driver systems and the used converter in order to smoothen the Flicker to 100%.

In this work a couple of standard LED phosphors have been tested, such as Y3Al5O12:Ce3+, BaMgAl10O17:Eu2+Mn2+, CaAlSiN3:Eu2+, Ca3Sc2Si3O12:Ce3+Mn2+ and Sr2P2O7:Eu2+Mn2+ with respect to flicker reduction. It will be demonstrated why Y3Al5O12:Ce3+ won’t lead to a solution for this problem and possible solutions will be discussed. The capability of other phosphors to reduce flicker will be shown. From these findings requirements for the development of novel phosphors to reduce the flicker problem will be drawn. A prediction will be given concerning the future potential of this technique and achievments so far will be presented.

Biography:

Pierre Karam, American University of Beirut, Lebanon

Abstract:

We report a self-referencing ratiometric nanothermometer based on short conjugated polyelectrolytes (CPEs). The probe is prepared by complexing a phenylene-based polymer with polyvinylpyrrolidone (PVP), an amphiphilic macromolecule that destabilizes CPE π–π stacking. This makes it possible to shift the equilibrium between the less emissive aggregated state of the CPE (520 nm) and its more emissive single chains (450 nm) within a useful temperature range (15.0–70.0 °C). The probe was tested in solution and to map the temperature of hydrogel materials.  We believe the reported nanothermometer will prove instrumental for the ongoing efforts to accurately map and investigate heat production and dissipation at the nanoscale level.

 

Biography:

Mohamad Hmadeh, American University of Beirut, Lebanon

Abstract:

MOF-199, ZIF-8 and ZIF67 crystals were successfully prepared through the diffusion of  the outer electrolytes (metal cations or organic linkers) into an agar gel matrix, in which the inner electrolytes  were immobilized. As the electrolytes diffuse into the gel, crystals were shown to precipitate. This novel method for synthesizing MOFs and ZIFs is rapid, scalable, and environmentally friendly. Due to the reactants being initially separated and poured on the top of each other, a supersaturation gradient was established starting at the gel-solution interface and extending down the reaction tube. Nucleation, growth, and ripening of the crystalline solid is highly dependent on supersaturation, such that nucleation dominates near the interface resulting in smaller crystals whereas further down the reaction tube, growth dominates leading to larger crystals. Accordingly, the supersaturation gradient produced various crystal sizes at different heights along the reaction tube. Furthermore, by varying the temperature, the concentrations of the reagents, and the thickness of the gel matrix, control of the size and morphology of the crystals was achieved and several key parameters in the mechanism of crystal growth are discussed.

Mike Broxtermann

Munster University of Applied Sciences, Germany

Title: On the VUV luminescence and degradation of UV-C emitting phosphors
Biography:

Mike Broxtermann has completed his bachelor and master studies at the Ruhr-University Bochum, Germany. Afterwards he has started his PhD studies on the analysis and improvement of UV emitting phosphor converted Xe-excimer lamps at the Münster University of Applied Sciences. The respective research project “Hg free UV Radiation Sources for Energy Efficient Water Treatment” is supported by the German federal ministry of education and research (BMBF). Mike Broxtermann himself is an awardee of the German foundation economics (sdw).

Abstract:

Xenon comprising excimer discharge lamps represent themselves as an efficient source of vacuum ultraviolet radiation, which may find an application, e.g. for disinfection purposes by the use of suitable photoluminescent conversion materials. 1,2 Among these conversion phosphors there are some doped yttrium ortho-phosphates, as well as respective lutetium or lanthanum containing derivatives, exhibiting promising properties. 3,4 A common design for phosphor converted Xe excimer lamps consists of a discharge vessel made from quartz glass, which is coated with a thin layer of phosphor particles (around 10 - 50 µm) on the inner side.


Experimental results demonstrate that all of the above mentioned PO4-based phosphor materials exhibit a distinct degradation resulting in a mayor loss of lamp UV radiation output over just a few days of operation time. Recovery of aged phosphor material enabled the investigation of that performance loss which could be traced back to a strong new absorption in the UV range. This is accompanied by well fitting excitation bands spreading over the UV spectral range as well as a corresponding broad band emission peaking in the deep red. Immersing analysis of the undoped phosphate compounds YPO4, LuPO4 and LaPO4 evidenced, that these aging effects find their origin within the phosphate host material itself being directly exposed to the plasma discharge, most probably to the existence of phosphorous III in [Ne]3s2 electron configuration. Further work is thus conducted on the understanding as well as on the obviation of phosphor aging throughout the application of protective particle coatings.

Biography:

Abstract:

In this research, the kinetics of oxidation process of carbon-monoxide on the nano-catalyst surface has been investigated. The investigation conducted in different flow conditions and temperature, by the range of T=70-350oC, dependence on kinetic  convertation of carbon monoxide to carbon dioxide in the closed system. İt is determined that speed of conversion process increases by 1.30-1.32 times as temperature increases on the surface of catalyst. At low flow rates the conversion of carbon-monooxide to carbon –dioxide runs more rapidly.

The kinetics dependent  on conversion of mix air, CO to CO2 has been shown on the surface of Nano-Al2O3+CuO  catalyst in different flows and under 70 to 200oC degrees temperatures. It has been determined that at all temperature  ranges, conversion proceeds over 90%. As a result of investigation it is known that conversion speed increases by 1.30-1.32 times, if the temperature is 70-200º C over reactor. Meanwhile, the volume of converted CO increases by 12-14%. Kinetics dependant on conversion of mix air and CO to CO2 has been shown on the surface of  catalyst in different flows and under 300oC degree temperatures. It has been determined that CO to CO2 conversion happens more rapidly in low flow rates rather than high.

At the same time, meeting time on catalyst surface also effects speed of conversion. It is shown at figure 5 that during 15 minutes the conversion at V=38 litr./min volume  carbon monoxide to carbon dioxide (N/No)*100%=50% while  at V=20 litr./min (N/No)*100% volume to be. The increase of conversion at T=300oC-temperature is cause to increase at  (N/No) 87-50=37% while the oxidation processes is occur much speed while confirmation is active in high temperature.

(Examples): Figure 5  shows conversion of carbon monooxide on mixed nano-catalyst surface dependent on  cycle speed of gaz mass at temperature of T=300oC. Figure 5. The kinetics of  arbon monoxide conversion on the catalyst surface.

Biography:

Ozge Yuksel Orhan obtained her Ph.D. in Chemical Engineering from Hacettepe University, Turkey, in December 2014. Her thesis is entitled “The Absorption Kinetics of CO2 into Ionic Liquid-CO2 Binding Organic Liquid Hybrid Solvents”. Currently, she is a Research and Teaching Assistant at Chemical Engineering Department of Hacettepe University. Her research topics have dealt with the study of carbon dioxide capture by novel solvents.

Abstract:

CO2 emissions into atmosphere is a global concern and a recent theoretical model provides a quantitative approach for its connection with global warming and climate change.  CO2 is potentially a suitable resource of carbon which can partially replace oil and gas in many synthetic applications. Benefits can also extend to safety considerations since it is not toxic. It can replace certain toxic building blocks such as CO and phosgene in several commercially important processes, such as methanol or polyurethane manufactures. In addition, it can be used as a viable technological fluid with distinct advantages over other possible solutions in applications such as enhanced oil recovery and supercritical solvent. In near future, the use in carboxylation processes (synthesis of carbonates, carbamates and carboxylates, including cyclic compounds in both monomeric and polymeric forms) appears to be the most likely synthetic applications. In these cases, CO2 serves as both carbon and oxygen sources. Replacing CO for making acrylic acid and use as a mild oxidant are other interesting applications. Reduction by catalytic and electrocatalytic hydrogenation necessitates energy from non-fossil fuels and solar and renewable energy resources should then be incorporated. The photocatalytic reduction of CO2 in water under solar light irradiation, which is known as artificial photosynthesis, is a potential option that would increase carbon recycling.

 A unique aspect of this paper is the exploitations of reactions of CO2 which stems from existing petrochemical plants-with the commodity petrochemicals (such as, methanol, ethylene and ethylene oxide) produced at the same or nearby complex in order to obtain value-added products while contributing also to CO2 fixation simultaneously. Exemplifying worldwide ethylene oxide facilities, it is recognized that they produce about 3 million tons of CO2 annually. Such a CO2 resource, which is already separated in pure form as a requirement of the process, should best be converted to a value-added chemical there avoiding current practice of discharging to the atmosphere.

Koo Thai Hau

Form 6 centre of SMK Taman Johor Jaya 1, Malasiya

Title: Allium cepa.L As Acid-Base indicator
Biography:

Gan Lui Nam is a teacher from Form 6 Centre of SMK Taman Johor Jaya 1,having 13 years teaching experiences in pre-university education. She actively promotes learning through research among students. She is currently pursing Doctoral in University Technology Malaysia. Koo Thai Hau and Ling Jia Yi are students from Form 6 Centre of SMK Taman Johor Jaya 1. They had been the members of Science and Mathematics Society. From the society, their interest towards the science is sparkling and leaded them to the path of keeping learning science after secondary studies. In their pre-university education, they obtained a chance to join the research team of the school ( Form 6 Centre of SMK Taman Johor Jaya 1). The research is mainly based on the natural plants functioning as acid-base indicators and the main materials are Allium cepa L. (onions). The research is done in the wish that the cost of acid-base indicator using commonly can be reduced. This research had successfully won a silver medal in the Third International Innovation, Design and Articulation competition.

Abstract:

In this study, a facile and environmentally friendly method was reported for manufacturing of natural acid-base indicator by preparing Allium cepa. L juice, which provided the anthocyannins pigment. The anthocyannins pigment was extracted via boiling process. In detailed, the Allium cepa. L was cut into small fragments. Then, the small fragments of Allium cepa. L was boiled in distilled water in order to extract the anthocyannin pigment. This process was followed by the addition of different solutions, acidic solution, base solution as well as neutral solution were added into separate test tubes filled with extraction of Allium cepa. L juices. The obtained Allium cepa. L juice was then used as the pigment for the acid-base indicator. The pH of the solution can be determined by observing the colour change in the Allium cepa. L juice. The light purplish colour of Allium cepa. L juice turned into red colour when added with hydrochloric acid; its purplish colour of the juice turned into yellow when added with sodium hydroxide; the original colour of Allium cepa. L did not undergo any observable colour change when distilled water is added into it. The Allium cepa. L exhibited excellent colour change property with chemical solutions. These colour changes make the Allium cepa. L be attractive for applications in acid-base indicators.

Biography:

Batric Pesic is a Distiguished Professor (teaching) at the University of Idaho.  He has received BS degree in metallurgical engineering from University of Belgrade-Campus Bor; MS (1976) and PhD (1982) from University of Utah, USA. Upon graduation, Dr. Pesic moved to Canada and worked for H.B.M.S., Flin Flon, Manitoba.  In 1983, he returned to the USA to join the University of Idaho.  His research interests have been, initially in extractive metallurgy, followed by environmental subjects.  Most current research is in electrochemistry in molten salts. He has extensive consulting experience with major chemical and metallurgical corporations in North America, Europe, and Africa.

Abstract:

Electrodeposition of nickel was studied by using rotating disk technique.  The electrode substrate was glassy carbon disk cut from a glassy carbon wafer produced by Toshiba.  The disk was mounted on a rotation speed controlled rotator made by IBM Instruments.  The electrochemical deposition was studied from nickel ammonium sulfate solutions of different concentrations and pH, as the reaction parameters.  The electrochemical techniques used were cyclic voltammetry, linear sweep voltammetry, and chronoamperometry.  The key feature of this study is that amount of electrodeposited disk was determined by two methods.  These are charge passed and amount of nickel deposited at particular time intervals, such as 15, 30 and 60 seconds.  Charge was determined by using a coulometer wired in line with the working electrode.  Nickel deposited was determined by dissolution in nitric acid and analysis by atomic absorption.   Both types of data were used in Levich equation for determination of kinetic parameters, such as reaction order, activation energy, etc.  For example, it was found that electrodeposition of nickel is of the first order, and that the activation energy was only 2.7 kcal/mol, indicating a mass transfer controlled reaction.  The current efficiency was a function of concentration, increasing with the increase of nickel concentration.  Morphology of electrodeposit was very smooth as confirmed by atomic force microscopy.

Biography:

Solhe Alshahateet has completed his PhD at the age of 33 years from the the University of New South Wales (Australia) and postdoctoral studies from Institute of Chemical and Engineering Sciences (Singapore). He is the dean of Scientific research at Aqaba University of Technology (Jordan), associate proffesor of chemistry at Mutah University (Jordan). He has published more than 70 papers in reputed journals and has been serving as an editorial board member of repute international journals.         

Abstract:

Adsorption studies were performed on selected heavy metals ((Pb(II), Co(II), Cu(II), Mn(II) and Zn(II)) using synthetic adsorbent (C-4-bromophenylcalix[4]resorcinarene 3) to investigate the effect of different parameters such as adsorbate dose, agitation time, and pH. Selectivity of the adsorbents towards a mixture of heavy metals adsorbates was investigated. Results showed that optimum agitation time of 30 min at pH of 5.6 at initial concentration of 1 ppm for all investigated heavy metals. Different kinetic models of Santosa first order, Lagergren pseudo first order and Ho pseudo second order were applied on the adsorption experimental data. Results proved that all adsorption processes were followed and adopted pseudo second order kinetic model. The adsorption capacity of C-4-bromophenylcalix[4]resorcinarene towards the selected heavy metal ions was 84.55%, 84.29%, 84.06%, 79.76%, 75%, for Cu(II), Pb(II), Zn(II), Mn(II) and Co(II), respectively. Selectivity of adsorption was tested on a mixture of Cu(II), Mn(II), Zn(II), Pb(II) and Co(II) with initial concentration of 1 ppm of each heavy metal and agitated time of 10 min with the adsorbent, removal percentage of each metal showed different values from each heavy metal alone as it was in decreasing order Cu(II)  > Co(II) > Mn(II) > Pb(II) > Zn(II). The rate constant value for each heavy metal adsorption mechanism obtained from Ho pseudo second order model was in the order Co(II) > Cu(II) > Zn(II > Mn(II) > Pb(II).

Biography:

Lars Baltzer is a professor in organic chemistry at uppsala university since 2004. He has a well-documented and longstanding interest in research topics related to catalysis and molecular recognition based on fundamental principles of physical-organic chemistry. He has introduced catalytic sites, demonstrated rate enhancements of several orders of magnitude and proven the formation of enzyme-substrate complexes in proteins he has designed from scratch. More recently he has become engaged in research on the molecular recognition of proteins by polypeptide conjugates, for the purpose of increasing affinities and selectivities for proteins of biomedical interest. Affinity enhancements due to peptide conjugation of four orders of magnitude, increased selectivities as well as improved pharmacokinetic and pharmacodynamic properties have been demonstrated. He has expertise in molecular design and the quantitative evaluation of structure and activity relationships especially those related to protein recognition.  Aleksandra Balliu obtained her Ph D in the laboratory of Lars Baltzer, working on aspects of the polypeptide conjugate technology.

Abstract:

Organic synthesis has reached a level of proficiency that allows the efficient preparation of molecules of high complexity but the design of small organic molecules and peptides with sufficient affinities and selectivities for proteins in biomedical applications lags behind. We have developed a technology where polypeptide conjugation to small organic molecules or peptides provides affinities increased by as much as four orders of magnitude in comparison to those of the small molecules. Selectivities between highly homologous proteins, measured as ratios of dissociation constants, have been shown to increase by between one and two orders of magnitude. The aspect of the technology that appears to be the most surprising, while it at the same time makes it the most attractive to use, is that a single sixteen membered set of polypeptides is enough to improve affinities and selectivities for essentially any protein. We have recently begun to focus our attention on problems related to in vivo applications, addressing a) the risk of elicitation of immune responses and b) the problem of fast renal clearance. To this end, chemical modifications were introduced that allowed us to reduce the size of the polypeptides from the original 42-residue scaffolds to 11-mers without loss of affinity. We have identified a small molecule ligand that will provide tight binding of peptides to human serum albumin, a carrier protein present in human blood at a concentration of 0.6 mM. HSA binding will keep peptides in circulation thus reducing the problem of fast renal clearance and, in addition, the rate of proteolytic degradation. The peptide conjugates to be discussed may be used e.g. in clinical imaging or as radiotherapeutic agents, but also as guides for the redesign of small molecule drugs or for target validation purposes.

Illustration of concept. Conjugate formed from small molecule ligand and 42-residue polypeptide binds target protein due to small molecule-protein interactions supplemented by those between peptide and protein in close proximity to the small molecule binding site. Protein is human Carbonic Anhydrase II and small molecule ligand is benzenesulphonamide.

Serag Ahmed Farag

National Centre for Radiation Research &Technology, Egypt

Title: Mitigation strategies of furan in coffee beans by irradiation process
Biography:

Farag has completed his PhD during 1986 from Ain Shams University ,Fac. Of Agric.And postdoctoral studies from Central Institute of food, Budapest ,Hungary.Also, extended to German grant in detection of irradiated food , Berlin.He works as Agric. Expert in Africa ,Tanzania for five years.Besides different presentation in International conference ,published more than 120 articles and  was supervision for many Master,PhD thesis.

Abstract:

     Worldwide Food Safety Agencies have classified furan as carcinogenic and cytotoxic due to its effects in animal studies, and it has been associated with harmful effects to human health. It has been pointed out that coffee consumption is the major contributor to dietary furan exposure for adults. In the present work , furan  analysis  in different  imported coffee samples was done. For that reason, in recent years this compound has received special attention from Food Safety Agencies and data on furan concentrations in commercial food products have been collected. In addition, technological strategies in order to prevent or mitigate furan formation in foods and, furthermore, to remove the already formed furan from the food product have been performed (EFSA, 2010; FAO/WHO, 2010; US FDA, 2004).

   In the present work, different coffee beans ( green,light and dark roasted beans) samples were irradiated  with different doses (5.0,10.0 and 20.0 kGy).Then, furan content was analysis by  HS-GC-MS for all treatments irradiated or not.  The obtained results proved that green coffee beans were less content in furan which increased linearly by thermal process ,whereas  irradiation doses   decreased linearly with high significant correlation coefficient (R2) .

    Therefore, γ- irradiation doses(5,10,20 kGy) were used for decontamination of molds in collected coffee green coffee beans for decontamination at 10 -20 kGy than using  roasted beans .In this respect ,the irradiated green coffee beans become more safety with low furan besides free of mould contamination.

Finally it could be recommended that using low dose (10kGy ) of γ- irradiation are the ideal solution to reduce the toxic substances besides  decontamination, disinfestations  of green coffee beans as safe alternative of using harmful chemical for human consumption besides decreasing furan content.

Biography:

H. Manuspiya has completed her PhD from Pennsylvania State University, USA, in 2003. She has been selected to receive L’Oréal Thailand’s For Woman in Science 2011 fellowships in recognition of her role as female scientists who make a great contribution to the science field. At the present, she is also appointed as Duputy Director of Center of Excellence in Petrochemical and Materials Technology, Thailand. She has published more than 40 papers in reputed journals and has been invited to contribute her knowledge in several committees for Thai government and agency.

Abstract:

The separator is a porous membrane placed between negative and positive electrodes which can be permeable to ionic flow while preventing electric contact of the opposite polarity electrodes. Conventionally, tit was fabricated by thermoplastic polyolefins. Among environmental concerns, the biodegradable materials were used instead of the conventional materials, known as green separator membrane. Poly(lactic acid) (PLA) is the one type of alternative biodegradable polymer derived from renewable resources which has high mechanical properties and high dimensional change.  However, there are several limitations of PLA including non-stable chemical resistance and low thermal stability. Poly(butylene succinate) (PBS) is commercially available aliphatic polyester with high flexibility, good toughness, high chemical resistance, and has a good biodegradability. Therefore, PBS was blended to improve the chemical resistance of PLA. Subsequently, cellulose was filled to improve the thermal stability and wettability of PLA. To provide more specific properties, cellulose was modified to sulfonated cellulose via oxidation/sulfonation reaction and plasma surface treatment. The obtained modified cellulose provided high hydrophilicity, biocompatible and surface area given an opportunity for using in wide applications, especially improved thermal properties, wettability and air permeability. The results indicated that cellulose extracted from sugarcane bagasse can be modified the high value added of agriculture waste in Thailand. PLA/PBS blended with modified cellulose and then fabricated to be a separator membrane via phase inversion method which creating the porous membrane. The green separator membranes were used instead of traditional separator membranes in the battery cell to test the performance of Li-ion battery.

Biography:

Hwan Kyu Kim received Ph. D from Carnegie Mellon University. After postdoctoral associate in Materials Science and Engineering at Cornell University, he joined ETRI as a project leader of polymeric photonic device group. After his career at Hannam University where he became Professor of Polymer Science and Engineering, he was invited as a distinguished professor to Korea University in 2007. He had executed the president-ship of both Korean Society of Photoscience and Korean Organic Photovoltaics Society. His current research focuses on developing advanced organic and polymeric semiconductors for dye-sensitized solar cells, perovskite solar cells as well as solar energy conversion.

Abstract:

Dye-sensitized solar cells (DSSCs) have attracted much interest as a promising renewable energy supply device based on the merits of low-cost, flexibility and easy fabrication. Very recently, a variety of organic dyes using inexpensive metals has been prepared for DSSCs. A state of the art DSC based on porphyrin-baseed solar cells with cobalt-based electrolyte has exceeded the conversion efficiency of 13.1%. For the high PCE of D-p-A sensitizer-based DSSCs, the structural modifications of a p-bridge, including tuning the energy levels and the improvement of intramolecular charge transfer (ICT) from D to A of the sensitizer, are particularly essential. We demonstrate that new thieno[3,2-b][1]benzothiophene (TBT)-based D-p-A sensitizers and D–π–A structured Zn(II)–porphyrin sensitizers based on the structural modification of SM315 as a world champion dye for efficient retardation of charge recombination and fast dye regeneration were synthesized. The device with new porphyrin sensitizers exhibited the higher photovoltaic conversion efficiency (PCE) than those of the devices with SM315 as a world champion porphyrin dye. To further improve the maximum efficiency of the DSSCs, by replacing the TBT p-bridge with the alkylated thieno[3,2-b]indole (TI) moiety, the TI-based DSSC exhibits a highest PCE (12.45%) than does TBT-based DSSC (9.67%). Furthermore, the first parallel-connected (PC) tandem DSSCs in the top cell with a TI-based sensitizer and bottom cell with a porphyrin-based sensitizer were demonstrated and an extremely high efficiency of 14.64% was achieved. In this presentation, new strategy on materials paradigm for low-cost, long-term stable, highly efficient dye-sensitized solar cells will be described.

Biography:

Cheolmin Park is an underwood distinguished professor at Yonsei University, professor of the Department of Materials Science and Engineering at Yonsei university. He received his B.S. and M.S. degree in the Department of Polymer and Fiber Engineering from Seoul National University in 1992 and 1995, respectively and a PhD degree in the Department of Materials Science and Engineering from Massachusetts Institute of Technology in 2001. He was a research scientist at Korea Institute of Science and Technology. After the postdoctoral fellowship at Harvard University in the Department of Chemistry and Chemical Biology, he joined at Yonsei University in 2002. His research has focused on self assembled polymers and their applications to organic photo-electronics. He has published over 130 SCI articles, delivered over 60 invited seminars.

Abstract:

Self-assembled nanostructures generated from synthetic polymer systems such as controlled polymer blends, semi-crystalline polymers and block copolymers have gained a great attention not only because of the variety of nanostructures they can evolve but also because of the controllability of these structures by external stimuli. In this presentation, various novel photo-electronic materials and devices are introduced based on the solution-processed nanomaterials such as networked carbon nanotubes (CNTs), reduced graphene oxides (rGOs) and 2 dimensional transition metal dichalcogenides (TMDs) with self assembled polymers including field effect transistor, electroluminescent device, non-volatile memory and photodetector. For instance, a nanocomposite of networked CNTs and a fluorescent polymer turned out an efficient field induced electroluminescent layer under alternating current (AC) as a potential candidate for next generation displays and lightings. Furthermore, scalable and simple strategies employed for fabricating rGO as well as TMD nanohybrid films allowed for high performance and mechanically flexible non-volatile polymer memories and broad band photo-detectors, respectively.

Biography:

Eunkyoung Kim is s professor at the Department of Chemical and Biomolecular Engineering,and the director of APCPI in Yonsei Unversity.  She has published more than 200 papers in reputed journals and has been serving as an editorial board member.         
 

Abstract:

The conversion of photons to heat in the conductive polymer films causes local heating to increase temperature at the light exposed area. The resultant heat can be converted into other type of energy such as electrical, mechanical, or chemical energy. In particular the photothermal energy conversion into mechanical energy gives a unique method for reversible change of a 2 dimensional to 3 dimensional structure on command. The challenge is the design of the photothermal architecture of the conductive polymer layer and their integration into a device, to optimize the light-to-heat-to-energy conversion efficiency as well as to maximize the long-term stability of the integrated system exposed to the light. Herein we present programmable bilayers prepared from conjugated polymers which was transferred onto a soft polymeric film, to form a bimorph. The resultant 2D programmable bilayers were reversibly folded into a 3 D structure through photothermal stimuli, to afford biomimetic 3 D structures. Effect of the chemical structure and composition in the bimorph on the sensitivity of structural conversion will be discussed.

Biography:

Reem Khalid AlBilali is an assistant professor in physical chemistry at the University of Dammam, Saudi Arabia since 2012. Her research interests are the synthesis and characterisation of supported metal nanoparticles and their catalytic applications, corrosion and corrosion inhibitions of metals and the adsorption of photoactive materials on clay surfaces. In September 2015, she joined Cardiff Catalysis Institute at Cardiff University, UK, as a postdoctoral researcher associate as she is still working there. AlBilali has many publications in both Arabic and English language, and she is a (MRSC) member in the Royal Chemical Society (RSC) and a member in the American Chemical Society, Saudi Chemical Society and the National Association of Corrosion Engineers (NACE).

Abstract:

An interesting alternative to aerobic conditions for the production of oxygenated products, such as aldehydes and ketones, can be the use of unsaturated organic molecule as a hydrogen acceptor, instead of molecular oxygen. In this case, the oxidative dehydrogenation is changed to transfer dehydrogenation, which overcomes the safety limitations of aerobic oxidation. In the majority of reported works, researchers represent the catalytic activity of supported metals such as palladium and ruthenium on the transfer dehydrogenation of alcohols. This work demonstrated the catalytic activity of supported palladium nanoparticles and the influences of different parameters, such as controlling particle size, changing the stabilizer, thermal treatment of the catalyst on the liquid phase transfer dehydrogenation of 1-phenyl ethanol as a model reaction under mild conditions. Varying catalyst loading, stirring rate, and the 1-Phenyl ethanol/palladium molar ratio have determined the different regimes. The apparent activation energy of 5%Pd/C was determined. Moreover, the influence of varying the stabilizer type, and concentration, during the synthesis of palladium nanoparticles via sol immobilization technique on the resulted particles, and their catalytic activity on the liquid phase transfer dehydrogenation of 1-phenyl ethanol was investigated. The chemical composition and morphology of the catalyst were determined using XRD, XPS, TEM and SEM-EDX. The results illustrated that the two main parameters which can mainly control the catalytic activity of the liquid phase transfer dehydrogenation of 1-phenyl ethanol are the ratio between metallic palladium to palladium oxide, and the particle size of the catalyst.

Biography:

Felipe Sánchez following my studies in Chemical Engineering in Málaga, I joined Cardiff University. Currently, I am a 3rd year PhD student.

Abstract:

Searching for a safe and efficient H2 generation/storage material has become a serious challenge toward a fuel-cell-based H2 economy as a long-term solution. Herein we report the development of Pd nanoparticles catalysts supported on 5 different carbon nanofibers (CNFs): three different grades and nitrogen and oxygen functionalisations; each one via sol-immobilisation and impregnation techniques. Thorough characterisation has been carried out by XRD, XPS, TEM, SEM-EDX. The catalysts have been evaluated for the formic acid dehydrogenation, which has potential to be a safe and convenient H2 carrier under mild conditions.
 

Those catalysts prepared by sol-immobilisation technique exhibit more activity when compared with catalysts prepared by impregnation due to the higher metal loading and higher Pd0/Pd ratio, smaller particle size (Fig. 1) and lower binding energies, leading to an improved activity due to the weaker interaction between the Pd nanoparticles and the formic acid. The heat treatment on CNFs has an important effect on catalyst activity, increasing with the annealing temperature (Fig. 2). Oxygen functionalities present a higher initial activity that could be addressed to a favoured deprotonation step due to the presence of O- on the surface, leading to an easier dehydrogenation of formic acid. However, deactivation was observed after 30 minutes due to CO evolution.
 

The most active catalyst reached a remarkable TOF of 979 h-1 and high selectivity (>99%) at 30 °C. Being this a great value for formic acid dehydrogenation at mild conditions however, further investigation is necessary in order to decrease the CO formation and improve reusability.

   

Figure 1. Bright field TEM micrograph of PdSI/CNF-HHT                                                               

Nevin Kaniskan

Anadolu University, Turkey

Title: Modelling of low band gap polymers
Biography:

Nevin Kaniskan has completed her PhD in 1989 from Anadolu University. She is associated proffessor of Anadolu University at Chemistry Department.

Abstract:

Conducting polymers, superior electrical, electronic, magnetic, and optical properties of compounds are very important in the industry. They are named as the "synthetic metal" or "organic metal". Thiophene can be prepared easily and have high conductivity. Therefore, too much theoretical work has been done until now. However, it is very little theoretical work about derivatives of these compounds. Since the interaction between alternating donors and acceptors results in a diminished band gap, a low band gap (<1.8 eV) will be expected in polymers containing donor–acceptor (D–A) repeating units. In order to predict the band gaps for guiding the synthesis of novel materials with low band gaps, we apply quantum-chemical techniques to calculate the band gaps in several polythiophene homo- and copolymers: poly{3-methylthiophene} (P1), poly{2,3-dihydrothieno[3,4-b][1,4]dioxine}, EDOT (P2) and polypyren (P3), poly{5-(4-methylthiophen-2-yl)-2,3-dihydrothieno[3,4-b][1,4]dioxine} (P3), poly{3-methyl-2-(pyren-1-yl)thiophene} (P4), and poly{5-(4-methyl-5-(pyren-1-yl)thiophen-2-yl)-2,3-dihydrothieno[3,4-b][1,4]dioxine} (P5). The geometries of the oligomers were optimized using semi-empirical PM6 method. The band gap calculations on these oligomers were performed by density functional theory (DFT) (B3LYP/6–31G(d,p). Band gaps of the corresponding polymers were obtained by extrapolating oligomers gaps to infinite chain lengths. The results indicate that calculated band gaps are in good agreement with the experimental values. In addition, depending on the type of substituent and the substitution pattern, large differences in the delocalization pattern are observed between the substituted and unsubstituted oligomers. It is found that the band gaps critically depend on the chemical structures.

Biography:

Rochd Sanaa, Hassan II University, Morocco

Abstract:

  Access to drinking water and resource management are major challenges of the coming decades. In a social and industrial purpose, it seems therefore vital for some people, particularly, in remote site to develop new facilities for drinking water production.

Membrane distillation is one of the latest developments in the distillation desalination. It is based on the principle of vapor migration of water through a hydrophobic microporous membrane by a vapor difference between a heated solution and the air in a cold channel (the condensation channel) cooled by the initial temperature solution. Air gap membrane distillation (AGMD) is considered one of the five configurations of the Membrane distillation.

Our contribution is to study the effect of NaCl concentration, porosity, and membrane pore size on the production of the flux .The results have been carried using polynomial approximations through MATLAB and the results show a good agreement with the experience.

Biography:

Abstract:

Synthesis of algae-silica hybrid material from Nitzschia sp. biomass was performed through sol-gel and silica coating with magnetite nanoparticles (MNPs).  The material produced of  algae-silica hybrid from Nitzschia sp. algae biomass covered with magnetite nanoparticles (AS-MNPs) was characterized by infrared (IR) spectroscopy to identify the functional groups existed in this material, X-ray diffraction (XRD) to analyze the structure of the material, and scanning electron microscope (SEM) to investigate the surface morphology of the material.  Adsorption process on AS-MNPs to Pb(II) ion was carried out by batch method.  Adsorption data obtained show that AS-MNPs is able to adsorb Pb(II) ion up to 97% at pH 5 with contact time of 30 minute at temperature of  27 oC.

Biography:

Hyunwook Jung has completed his BS at department of chemical & biomolecular engieering in Yonsei University. After serving as marine for two years he joined graduate program of Yonsei University. He was invited to the 10th International Conference on Computational Physics (ICCP10) held at Macao in China, January, 2017.    

Abstract:

Lethal accidents caused by explosive reactions of toxic chemicals should be prevented and once happened, fast and safe control is of importance. An accurate understanding of thermodynamic properties and kinetic rates is the first step toward accomplishing the purpose 

Using first principles density functional theory (DFT) and ab-initio molecular dynamic (AIMD) simulations we study hydrolysis reactions of two archetype chemicals, PCl3 and POCl3, to unveil potential energy surface over reaction cooardinates. By calculating the intermediates and Gibbs free energy diagrams reaction mechanism and activation barriers.

Our results indicate that H2O molecules nearby the chemical species play a key role in catalyzing the hydrolysis reaction as a proton donor or acceptor. The catalytic mechnisms is explained as more water molecules attach the charge separation at the transition state is enhanced, leading to higher polarity and stabilization via hydrogen bonding network. It could dramatically reduce the activation energy of reactant complex. The effect is, however, mitigated by disordering entropic effect resulting in only slight reduction of activation energy upon increasing H2O molecules. 

It is noteworthy that PCl3 react with H2O molecule by interplay of the proton transfer and dissociation of chlorine, while POCl3 first forms a six-coordinated complex and then, quickly decomposes to HCl. Reaction rate constants are calculated from calculated activation energy using a transition state theory.

David L Officer

University of Wollongong, Australia

Title: Moving microdroplets in 3D using photochemopropulsion
Biography:

David Officer is professor of organic chemistry in the intelligent polymer research institute and the australian research council centre of excellence for electromaterials science at the university of wollongong, wollongong, australia. he joined the lecturing staff at massey university, new zealand in 1986 and during the following 20 years, he became founding director of the nanomaterials research centre and professor in chemistry in the institute of fundamental sciences. in 2007, he moved to the university of wollongong. he has published more than 200 papers in the areas of graphene and porphyrin chemistry, conducting polymers, nanomaterials and solar cells.

Abstract:

The ability to selectively transport chemical species in a controlled fashion, typically against chemical and electrochemical gradients, has been the cornerstone of the development of complex natural systems. In 2013, the Nobel Prize in Physiology or Medicine was awarded to Rothman, Schekman and Südhof "for their discoveries of machinery regulating vesicle traffic, a major transport system in our cells".  Vesicles are closed cellular structures formed from lipid bilayers that are used to actively transport macromolecules from inside cells to the outside fluid by a process known as exocytosis or between cells by a variety of mechanisms. In exocytosis, the macromolecules are contained in the vesicle that isolates them from the rest of the cell and which eventually fuses with the cell membrane to release the macromolecular cargo to the outside of the cell.  Emulating such structures and processes in the fluid environment is considered one of the grand challenges confronting nanoscience today and has the potential to add revolutionary capabilities to fluidic platforms that could be used to transport medicine in the human body, act as chemical messengers for signal transduction in sensing or other systems, move cargo around microfluidic devices, or even be utilized for transport in artificial cellular systems.

We have developed lipophilic droplets whose movement and direction can be controlled on or in an aqueous medium solely by photo-driven “chemopropulsion” (photochemopropulsion). In this presentation, we will demonstrate how the droplets can be “pushed” or “pulled” by light in 3D, are able to carry “cargo”, and undertake sequential chemical reactions through the interaction of two or more droplets.

Biography:

Diana Ciuculescu-Pradines completed her PhD from Paul-Sabatier University in 2007 and carried out postdoctoral studies at University of Liverpool. She has been assitant professor at Paul–Sabatier University, Toulouse, France since 2008. Her reserch interests concern the engineering of well-defined and functionalized nanostructures by taking advantage of coordination chemistry concepts and the study of their physical properties for their application in biology and nanomedicine. She has published more than 25 papers including a review and a book chapter.
 

Abstract:

Iron-based nanoparticles are very popular materials due to their interest for biomedical applications such as magnetic resonance imaging, magnetic hyperthermia, drug delivery or in other areas of nanomedicine. However the potential of these nanoparticles is limited by the poor magnetic properties of iron oxides from which they are made of.  Zerovalent iron nanoparticles would be more suited given their higher magnetization properties but the synthesis of stable colloidal solutions in water is very challenging due to dipolar interactions and oxidation.

Zerovalent iron nanoparticles, with good control of size and cristallinity, are synthetised in non biological media (organic solvants) and present at their surface different coordinated ligands used as stabilizers. Their transfer into water which is mandatory for biomedical applications requires to master the complexity of their surface chemistry in order to avoid their dissolution or total oxidation in aqueous medium.[1] Few work has been  done in this direction and only silica coating was succesfully experimented up-to-now,[2] confirming that aggregation of zerovalent iron nanoparticles could be prevented and their oxidation limited in water.

As an alternative to silica coating we present here the potential of a poly(ethylene oxide)-phosphonic acid ligand [3] to coordinate onto the surface of zerovalent iron nanoparticles. The anchoring of this ligand allows to passivate the iron nanoparticles and to impart them with water solubility thus affording a well-suited nanomaterial for biomedical applications. The strategy of the synthesis which takes benefit from coordination chemistry concepts [4] and the characterization of the so-obtained nanomaterial will be detailed.

Pavel Sorokin

National University of Science and Technology MISiS, Russian Federation

Title: The features of diamond nucleation on nanolevel. Prediction of diamondization of multilayered graphene
Biography:

Pavel Sorokin has completed his PhD at the age of 25 years from Lebedev Physical Institute of RAS, Moscow and postdoctoral study from Rice University. He is the leading researcher of Inorganic Nanomaterials Laboratory in National University of Science and Technology "MISIS". He has published more than 80 papers in reputed journals.           

Abstract:

Since the isolation in 2004 graphene continues to attract significant attention from the scientific community. Despite of the fact that graphene is under detailed investigation more than 10 years it still serve as a source for unusual effects.

Here I will show that multilayer graphene surface can be used a base for formation of diamond nanofilms facilitated by chemical adsorption of adatoms on the multilayer graphene surface, and explain how the pressure of phase transition is reduced and formally turns negative. For the first time we obtain, by ab initio computations of the Gibbs free energy, a phase diagram (PT ,h) of quasi-two-dimensional carbon—diamond film versus multilayered graphene. It describes accurately the role of film thickness h and shows feasibility of creating novel quasi-2D materials. In such “chemically induced” phase transition both chemistry and compression concurrently serve as the driving factors for diamond film formation. I will continued to discuss this effect through the ultrastiff films with hexagonal diamond (lonsdaleite) type structure and further show that under the particular external conditions and using particular adsorbate atoms films with the specific structure can be formed. The process of diamond phase nucleation was further investigated on the atomic level. The critical size of graphene hydrogenated region which can initiate graphene diamondization was estimated. The nonlinear dependence of size of graphene hydrogenated region upon the number of layers predicted the maximal thickness of the film which can be formed by chemically induced phase transition.

This research was supported by Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of  NUST «MISiS» (№ К2-2015-033).

Biography:

Ozge Yuksel Orhan obtained her Ph.D. in Chemical Engineering from Hacettepe University, Turkey, in December 2014. Her thesis is entitled “The Absorption Kinetics of CO2 into Ionic Liquid-CO2 Binding Organic Liquid Hybrid Solvents”. Currently, she is a Research and Teaching Assistant at Chemical Engineering Department of Hacettepe University. Her research topics have dealt with the study of carbon dioxide capture by novel solvents.

Abstract:

CO2 emissions into atmosphere is a global concern and a recent theoretical model provides a quantitative approach for its connection with global warming and climate change.  CO2 is potentially a suitable resource of carbon which can partially replace oil and gas in many synthetic applications. Benefits can also extend to safety considerations since it is not toxic. It can replace certain toxic building blocks such as CO and phosgene in several commercially important processes, such as methanol or polyurethane manufactures. In addition, it can be used as a viable technological fluid with distinct advantages over other possible solutions in applications such as enhanced oil recovery and supercritical solvent. In near future, the use in carboxylation processes (synthesis of carbonates, carbamates and carboxylates, including cyclic compounds in both monomeric and polymeric forms) appears to be the most likely synthetic applications. In these cases, CO2 serves as both carbon and oxygen sources. Replacing CO for making acrylic acid and use as a mild oxidant are other interesting applications. Reduction by catalytic and electrocatalytic hydrogenation necessitates energy from non-fossil fuels and solar and renewable energy resources should then be incorporated. The photocatalytic reduction of CO2 in water under solar light irradiation, which is known as artificial photosynthesis, is a potential option that would increase carbon recycling.

 A unique aspect of this paper is the exploitations of reactions of CO2 which stems from existing petrochemical plants-with the commodity petrochemicals (such as, methanol, ethylene and ethylene oxide) produced at the same or nearby complex in order to obtain value-added products while contributing also to CO2 fixation simultaneously. Exemplifying worldwide ethylene oxide facilities, it is recognized that they produce about 3 million tons of CO2 annually. Such a CO2 resource, which is already separated in pure form as a requirement of the process, should best be converted to a value-added chemical there avoiding current practice of discharging to the atmosphere.

Biography:

Byungchan Han obtained his Phd degree in mit at the dept. of mater. sci. & eng. he was research associate in mit and stanford university fir four years. from 2015 he has been working at yonsei university as an associate professor. his research interests are developing emerging energy materials for renewable energy devices. He was introduced as 10 most leading young scientists from korean newspaper. his research work was reported by the korea national research foundation in 2016. he was awarded a medal from international advanced association of materials in 2016. He is an associater editor of scientific reports.

Abstract:

First principles-based computational modelings propose key dscriptors and design concepts for discovering highly active materials in renewable energy system application. Density functional thoery calculations combined with statistical mechanical formalism identify optimum catalysts for oxygen (hydrogen) reduction (oxifation) and evolution reactions beyond concentional Pt used in fuel cell and Li-ion batteries. In this talk, it is unveiled reaction mechanism of environmentally toxic gases with water and suggest how to remove them by designing efficient filters. Organic iodine and POCl3 are introduced as the examples

Biography:

Sara Mousavi is from ZHAW Life Sciences und Facility Management, Switzerland

Abstract:

The use of synthetic dyes in different industries such as paper, textile, paint, printing, and plastics is inevitable. Environmental concerns due to their UV and temperature stability together with their inhibiting effects on photosynthetic activities ask for improved dye removing processes.

Dye adsorption is a promising method in dye removing process, as it is cost efficient, easy and flexible without any new toxic by-products. Difficulties such as separating the adsorbent after the removal process together with their low efficiency were overcome by the development of new adsorbents based on electrospun nanofiber membranes.

However, besides all the outstanding properties of electrospun nanofiber membranes such as their huge specific surface area tailored surface functionality and fiber uniformity, they are still facing challenges such as low mechanical stability and unfavorable mass transport properties.

To overcome these problems, a robust 3D sponge like aerogel with high porosity, mechanical stability, and flexibility as well as low density was developed using pullulan: nanofibers are electrospun from the natural and edible polysaccharide pullulan followed by cutting in dioxane, proceeding with a freeze casting process and finally thermally crosslinked.

The pullulan based super elastic and environmentally friendly aerogel is used as a highly efficient adsorbent to remove cationic dyes from aqueous solutions. Dye adsorption is pH dependent and recycling of the aerogel adsorbent is demonstrated.

Biography:

Sara Mousavi is from ZHAW Life Sciences und Facility Management, Switzerland

Abstract:

The use of synthetic dyes in different industries such as paper, textile, paint, printing, and plastics is inevitable. Environmental concerns due to their UV and temperature stability together with their inhibiting effects on photosynthetic activities ask for improved dye removing processes.

Dye adsorption is a promising method in dye removing process, as it is cost efficient, easy and flexible without any new toxic by-products. Difficulties such as separating the adsorbent after the removal process together with their low efficiency were overcome by the development of new adsorbents based on electrospun nanofiber membranes.

However, besides all the outstanding properties of electrospun nanofiber membranes such as their huge specific surface area tailored surface functionality and fiber uniformity, they are still facing challenges such as low mechanical stability and unfavorable mass transport properties.

To overcome these problems, a robust 3D sponge like aerogel with high porosity, mechanical stability, and flexibility as well as low density was developed using pullulan: nanofibers are electrospun from the natural and edible polysaccharide pullulan followed by cutting in dioxane, proceeding with a freeze casting process and finally thermally crosslinked.

The pullulan based super elastic and environmentally friendly aerogel is used as a highly efficient adsorbent to remove cationic dyes from aqueous solutions. Dye adsorption is pH dependent and recycling of the aerogel adsorbent is demonstrated.

Biography:

Zahoor Ahmad is a faculty member in department of chemistry at Kuwait University, Kuwait.

Abstract:

The preparation and properties of the aramid-multiwalled carbon nanotubes (Ar-MWCNT) nano-composites using functionalized and pristine CNTs will be discussed.  In-situ polymerization technique was used to link chemically the amine-terminated high molecular weight aramid chains with acid-functionalized MWCNTs.  The effect of functionalization on composite morphology has been investigated by scanning electron microscope.  Dynamic mechanical thermal analysis (DMTA) showed a higher increase in the storage modulus and the temperature involving α-relaxations on CNTs loading in comparison to the system where pristine CNTs were used.  The depression in the tan delta peak indicates the polymer chains participating in the glass transition were reduced in the composite film on loading with the MWCNT.  Thermal mechanical analysis showed a drop in coefficient of thermal expansion, prior to glass transition temperature that is consistent with immobilization of polymer material present at the CNT interface.  The thermal decomposition temperature of these composites was around 533 oC.  The strong interfacial interactions of the matrix with the functionalized CNTs in the composite material resulted in higher visco-elastic properties and a more reduction in the coefficient of thermal expansion of aramid on loading the MWCNTs. The chemically bonded composites where acid-functionalized CNTs were used showed better results than the pristine CNTs.

Biography:

Zahoor Ahmad is a faculty member in department of chemistry at Kuwait University, Kuwait.

Abstract:

The preparation and properties of the aramid-multiwalled carbon nanotubes (Ar-MWCNT) nano-composites using functionalized and pristine CNTs will be discussed.  In-situ polymerization technique was used to link chemically the amine-terminated high molecular weight aramid chains with acid-functionalized MWCNTs.  The effect of functionalization on composite morphology has been investigated by scanning electron microscope.  Dynamic mechanical thermal analysis (DMTA) showed a higher increase in the storage modulus and the temperature involving α-relaxations on CNTs loading in comparison to the system where pristine CNTs were used.  The depression in the tan delta peak indicates the polymer chains participating in the glass transition were reduced in the composite film on loading with the MWCNT.  Thermal mechanical analysis showed a drop in coefficient of thermal expansion, prior to glass transition temperature that is consistent with immobilization of polymer material present at the CNT interface.  The thermal decomposition temperature of these composites was around 533 oC.  The strong interfacial interactions of the matrix with the functionalized CNTs in the composite material resulted in higher visco-elastic properties and a more reduction in the coefficient of thermal expansion of aramid on loading the MWCNTs. The chemically bonded composites where acid-functionalized CNTs were used showed better results than the pristine CNTs.