Mineo Hiramatsu is a Full Professor of Department of Electrical and Electronic Engineering and the Director of Research Institute, Meijo University, Japan. His main fields of research are plasma diagnostics and plasma processing for the synthesis of thin films and nanostructured materials. He served as chairman and member of organizing and scientific committees of international conferences on plasma chemistry and plasma processing. He was awarded the Japan Society of Applied Physics Fellow in 2017.
Graphene-based materials such as carbon nanotube (CNT) and graphene itself have attracted much attention due to their emerging applications. Graphene-based materials can be synthesized by several plasma enhanced chemical vapor deposition (PECVD) techniques on heated substrates. For example, plane graphene can be formed by low-pressure PECVD on Cu and Ni in the remote plasma configuration. However, excess flux of carbon precursors causes supersaturation and ion bombardment induces the defects. Previously a microwave-excited non-epuilibrium atmospheric pressure plasma source with high electron density of ~1015 cm-3 and low electron temperature of ~1 eV was applied to the synthesis of CNTs. This type of plasma has a great potential for realizing the new material processing because the larger amount of radicals is estimated by a few orders of magnitude compared with the conventional low-pressure and high-density plasmas. Furthermore, the effect of ion bombardment on the growing surface can be removed due to the high-pressure operation. Here, microwave-excited atmospheric pressure plasma employing He/H2/CH4 mixture was applied to the synthesis of graphene-based materials. A schematic of atmospheric pressure PECVD system is shown in Fig. 1. The microwave (2.45 GHz) propagates from the top of the deposition chamber to the micro-slit electrode. The micro-slit electrode width is 0.2 mm. Formation of plane graphene was carried out on Cu substrate for 10-300 sec at microwave power of 100 W, total pressure of 1 atm and substrate temperature of about 700 ËšC. In spite of the localized plasma shape, graphene was formed uniformly on the whole substrate. Moreover, the number of graphene layers did not increase even in the increase of formation period. Results indicated that the self-limiting growth of few-layer graphene could be attained on the Cu substrate by the supply of long-lived hydrocarbon radicals without ion bombardment using atmospheric pressure plasma.
He is a Professor at the Department of Materials Engineering, Hubei University of Automotive Technology
Texture and grain size was of crucial importance to fatigue crack propagation in aluminum alloys due to boundary character between neighboring grains and crack-closure effect. The current understanding of the relationship among texture, grain size, slipping and crack propagation at fatigue stage I to III was reviewed and discussed. This includes understanding slip band formation, twist boundary character and corresponding fatigue mechanism. The recommendations for improving fatigue property were also proposed. Intensifying Goss, P and Q texture and moderating these grains was an effective method to improve the resistance of fatigue crack propagation in Paris regime. However, in fatigue stage I, due to predominated effect of crack-closure effect, large grain is beneficial for improving the threshold value of crack propagation.
Yasser Mohamed Mahmoud Moustafa has completed his PhD in Organic Chemistry, Ain Shams University, Egypt and postdoctoral studies at Department of Analysis & Evaluation, Egyptian Petroleum Research Institute. He has published more than 65 papers in reputed journals and has been serving as Organizing Scientific Committee, Conference General Secretary, Chairperson for Plenary Session, Conference Coordinator for International Conference on “Petroleum & Mineral Resources and Development. Also, he acts as Editor- in-chief of Egyptian Journal of Petroleum.
In this review, it was showed how by developing a facile one-pot co-precipitation process, the granule activated carbon (gAC)/Kraft lignin (KL) biocomposite (gAC/KLx) was constructed from recycling industrial wastes of both palm-date pits and pulping black liquor as a new eco-friendly sorbent. The ATR-FTIR, XRD, SEM, BET, TGA, DLS and Zeta potential analyses were used to characterize the gAC/KL biocomposite prepared to be used as an effective sorbent of environmentally toxic (BTX) compounds (benzene, toluene and xylene) from petroleum wastewater effluents. Also, using high performance liquid chromatography (HPLC), the sorption behavior of BTX over gAC/KLxbiocomposites with different ratios of Kraft lignin (x = 33, 50 and 67%) in batch experiments were evaluated. It was noticed that, the gAC/KL showed the highest sorption capacity of BTX at lignin blended ratio of 50%, even from broad ranges of water salinity (up to 100,000 mg/L) and pH values (pH 4 - 9).The sorption behaviorof BTX compounds were found to fit better to a type twopseudo-second kinetic (adsorption kinetic rate of BTX at 0.104 g.mg-1.min-1) and Langmuir isotherm models, as confirmed by the higher coefficient of R2> 0.98. The sorption affinities of the gAC/KL0.5 biocomposite with respect to 250 mg/L BTX can be ordered in the sequence Xylene > Toluene ≥ benzene with highestmonolayer capacities reached to 170.5, 160.5 and 159.7 mg/g, respectively after 6 h. The adsorption mechanism was found to follows the diffusion and hydrophobic sorption mechanisms. Particularly, the possibilities of BTX elution for gAC/KL0.5 reuse was evaluated up to five cycles without high significant loss in sorption efficiencies during multiple wastewater treatment.As such, on the basis of batch BTX sorption studies, the gAC/KL0.5 is expected to be a promising low cost and high performance new sorbentto be reutilize for real wastewater treatment process and petroleum hazardousdecontamination with higher thermal stability (up to 350 oC) and aqueous stability (10% - 21% efficiency loss).
He is a Professor in IST, Portugal
Over 90% of all Polymeric Materials now in production use Petrochemical raw materials. It is well known that in the future, renewable and sustainable raw materials will be mandatory, for a large number of reasons. Amongst the different primary sources of raw materials for Polymeric Materials, wood appears to be a very interesting one since the forests are the more efficient and natural alternative for Carbon Dioxide capture, with consequent carbon fixation. A new process of Wood Liquefaction, by simultaneous catalytic depolymerization of Lignin and celluloses, in liquid phase and atmospheric pressure was developed, with one overall yield around 94% on a dry wood basis. The obtained “liquid Wood” after extraction with water to remove the soluble oligosacharides, proved to be one excellent starting material for adhesives and reactive polymers. A short review of other alternative sources of sustainale raw materials is presented.
Gulfam Nasar currently works at BUITEMS, Quetta Pakistan as Assistant Professor. His research interests are mainly Material Chemistry, Polymer Chemistry and Nanotechnology. His current project is on 'polymer-ferrites nanocomposites'. Dr. Gulfam Nasar is a member of editorial boards of a number of research journals. He has presented his work in many international conferences around the world. He has published more than 20 publications in internationally reputed journals.
Terbium doped magnesium spinel ferrites (Mg1-xTbxFe2O4) and PVA/Mg1-xTbxFe2O4 composites having composition x=0.12, 0.14, 0.16, 0.18 were synthesized using micro-emulsion method and in-situ polymerization technique respectively. The structural properties were demonstrated using X-ray diffraction (XRD) and Fourier transform infra-red spectroscopy (FTIR). XRD analysis confirmed the fabrication of small concentration of Terbium into the spinel lattice whereas FTIR exposed the developed interactions between ferrite nanoparticles with polyvinyl alcohol matrix. The peaks obtained in both the above characterization techniques quite matched with those as reported in the literature and confirmed the formation of resulting nanocomposites. The dielectric and resistivity analyses were performed by determining dielectric parameters and current-voltage measurements. The values of dielectric constant, dielectric loss and tan δ were inversely proportional to the frequency under applied electric field at room temperature but become constant at higher frequency values. The lower values of dielectric constant of terbium incorporated magnesium ferrite polymer composites (MgFe2O4/PVA) are because of hindrance in electron exchange mechanism created by lockup among iron and terbium ions. The resistivity values of all the composites were found from 2.5x109 â„¦cm to 18.8x109 â„¦cm which showed a non- linear behavior.
V O Fadipe holds a PhD degree in Chemistry (Organic/Natural Product) from University of Zululand, South Africa. He is presently Principal Research Fellow /Assistant Director, Federal Ministry of Science and Technology, Abuja, Nigeria. He has several research publications in chemistry of natural product for the treatment of TB. His research interest is in the bio-prospecting for drug lead candidates from natural products (plant and animal) for management & treatment TB and repositioning of existing drugs for infectious diseases. He is a member of several learned society in chemistry.
Tuberculosis (TB) is highly endemic disease world-wide. One of the commonly used first line drugs for anti-TB therapy (ATT) is isoniazid (INH). Isoniazid is known to be majorly metabolized and detoxified in liver by both phases I and phase II group of drug metabolizing enzymes. The drug and along with its metabolite are toxic and during its assimilation process cause injury to liver. The work presented here involves investigation of co-crystals involving isoniazid and oleanolic acid. A 1:1 co-crystal involving isoniazid, a foremost first-line drugs recommended by the World Health Organisation for the treatment of tuberculosis, which causes damage to the liver and Oleanolic acid, a hepatotoxicity naturally occurring compound, have been synthesized for the first time. Considering drug combination perspective, this is an interesting pharmaceutical co-crystal because of the known side effect of isoniazid therapy which might be improved upon by the presence of the oleanolic acid. The co-crystal compound was characterized using PXRD, TGA and SEM which were further evaluated for in vitro anti-TB and cytotoxicity index, using Human Embryonic Kidney (HEK 293) and Human Hepatocellular carcinoma (HepG2) cells. The PXRD of the synthesized co-crystal compound maintained crystalline nature like isoniazid for the three methods, TGA for all the three methods have cleavage values from 2200 C- 360O C, and the SEM images obtained from the three synthetic methods appears rod-like in nature. The co-crystal of OA with INH, increased the anti-TB MIC values for the three synthetic methods used as follows(a) Solvent evaporation(1.06µM) ;(b) Solvent drop (0.50µM) ;(c) Direct grinding (0.61 µM). The cytotoxicity tests of the co-crystal system on the two-human cell lines (HEK 293 and HepG2) were found to be IC50 ≥ 300ug/ml. The finding of the current work is that, co-crystal compound of OA with INH is probable and could be utilized to design better treatment for tuberculosis disease, which can further be extended to the treatment of HIV/TB co-infection.
He is a Professor from National Agency for Science & Engineering Infrastructure, Abuja, Nigeria.
Studies have shown that nanomaterials remain one of the most promising materials for modern and advance in the development of science and technology. In medicine particularly, cure and management of chronic diseases have been discovered through application of nanochemistry. Development of synthesis protocols for realising nanomaterials over a range of sizes, shapes, and chemical compositions and biological activity is therefore an important application of nanochemistry in medicine. The remarkable biological activity dependent physico-chemical properties of co-crystal system have fascinated and inspired research activity in this direction. In this presentation therefore, attention will be focused on the background introduction, the synthesis methods to prepare a co-crystal system from two solid organic compounds for better management and treatment of infectious diseases particularly tuberculosis, and its various characterization techniques will be discussed.
Yosef Geberab is working in Yosef technology solution as G / manager.
Ethiopia has been striving in devising various strategies that assist it in gearing towards achieving this goal. Among the strategies that exist is delivering quality, equitable accessible and relevant education to its citizens. This was taken as a panacea to the problems. Far areas of the country were suffered a lot due to lack of qualified and competent teachers, laboratory equipment and reference materials. It’s had been a very challenging task to address more that 75% of student in different education issues Due to these. The government has made a reform in the education sector. the need for these reform was targeted in tacking problem related to the shortage of qualified and experienced teachers at all level , lack of instructional aids , laboratories and the required chemicals and apparatuses, lack of ICT centers and poor curricular orientation have been hampering the access, relevance, equality and quality of education in Ethiopia for decades. As part of education reform the government has started to implement education satellite program by deploying and installing different ICT accessories to receive and send signals from central station to each school at every corner of the country through VSAT communication. As the ICT domination in our day to day life is increasing. the Ethiopia government convinced to utilize its opportunity for improving quality of education by introducing Plasma Television learning Media in high schools which are located in different and very far a part of country .in order to increase the quality of education throughout the country .the government has implemented education satellite television broadcast program and proved through the impact assessment made by different stakeholder that there is an interesting and promising improvement in the quality of education throughout the country. Now a day our company collaborate with government developing ICT sector in education and social life. Today more than 36000 PLASMA TV are installed throughout the country in secondary schools. ICT has now playing a vital role in education sector of in Ethiopia.
Originally physics was a science of observing all phenomena, including those whose existence was not proved experimentally. However, since the introduction of the laws of Newton, based upon observations of massive objects, like bullets, physics became a purely deteministic science. If phenomena could not be measured, they were ignored. When a century ago experimental results became increasingly counter-intuitive, scientists accepted that physics was going beyond human imagination. Later we continued to consider elementary particles as massive objects like tiny bullets, glued together by a rather mysterious medium called force. Since the discovery of nanomaterials it is incomprehensible that they behave in a different way than matter in massive objects. To be able to understand the behavior of new materials, the Newtonian way of thinking is expanded with an indeterministic way of thinking, based upon insights from quantum mechanics. The notion of indeterminism started with the uncertainty principle of Heisenberg. He was convinced that physics can be described entirely in a complementary way. However, not until forty years later a definition of complementarity was introduced by Jammer. Applied to everyday life, it opens a new window to the world. Having enhanced our comprehension with this new view, we constructed a complementary foundation for physics, called twin physics. The elementary item is the Heisenberg-unit, being a unit of potential energy. Only by interaction with another H-unit it can partly or fully be transformed into actual energy. Space is considered as a finite physical item being as important as mass. Twin physics is connected with classical physics by the laws of Maxwell, emerging from it. Four types of electrons are described, two of them being related to electricity in new materials. Also finite magnetic fields around them are described, restricted to a space of about molecular size.
I developed an early interest in international relations and interdisciplinary studies. I developed a curious mind as to with regards to international relations. Due to this, I decided to take up a course that is related to world modern-knowledge. In 2010, I received my degree in BA Chemical Engineering during three years in Shiraz University of Iran so I have completed my MSc in Nanoscience and Nanotechnology from Sharif University of Technology with the highest honors.I deeply believe in cooperation because working together increase the qualification of research. I have started my group work from 2013 with the best colleagues in Iran and Egypt and we are working on environmental friendly procedure to recycle polymer wastes and nano composite membranes
The preparation and characterization of a new type of nano composite polyelectrolyte membrane (PEM), based on DuPont TM Nafion ® / imidazole modified nanosilica (Im-Si), for direct methanol fuel cell (DMFC) applications is described. Related to the interactions between the protonated imidazole groups, grafted on the surface of nanosilica, and negatively charged sulfonic acid groups of Nafion, new electrostatic interactions can be formed in the interface of Nafion and Im- Si which result in both lower methanol permeability and also higher proton conductivity. Physical characteristics of these manufactured nanocomposite membranes were investigated by scanning electron microscopy (SEM), thermogravimetry analysis (TGA), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), water uptake, methanol permeability and ion exchange capacity, as well as proton conductivity. The Nafion/Im-Si membranes showed higher proton conductivity, lower methanol permeability and, as a consequence, higher selectivity parameter in comparison to the neat Nafion or Nafion/silica membranes. The obtained results indicated that the Nafion/Im-Si membranes could be utilized as promising polyelectrolyte membranes for direct methanol fuel cell applications.