18^th International Conference and Exhibition on Materials Science and Chemistry May 18-19, 2020 Berlin, Germany

Biography:

Abstract:

In recent years, the quality of surface water in the city of Fez has deteriorated day after day due to the development of various anthropogenic activities, reckless human action, the discharge of wastewater in an unregulated manner and waste. solid. This poses a worrying threat to man and the environment. Upstream treatment of this water would be desirable.

The objective of this study is to contribute to the treatment of metallic pollutants from surface water discharged into the most polluted wadis identified in the city of Fez: wadi Tghat and Zhoun, by coagulation-flocculation.

The results of the treatment of these surface waters discharged into wadis Tghat and Zhoun which downstream wadi Fez by coagulation-flocculation under optimal conditions, from pH to 6.5, a dose of Aluminum Sulphate coagulant equal to 0, 15 gL-1 and Praestol flocculant equal to 1 mg.L-1, in a time of rapid coagulation and slow flocculation of 3min at 150 rpm-1 of coagulation and 20 min at 20 rpm-1 of flocculation made it possible to reduce their overall metallic load by approximately between 90% and 94, ie: almost 94.26% Cr; 93.76% of As; 92.98% of Pb and 92.24% of Cd at wadi Tghat and 93.34% of Cr; 90.71% of As; 92.11%; from Pb and 92.94% from Cd to oued Zhoun

Biography:

Dr. Pramiti Hui have expertise on Synthesis, Characterization, Self-Assembly, Optical Wave Guiding and Device fabrication. She studied Chemistry at the Banaras

Hindu University, India and graduated as M. Sc in 2008. She then joined the research group of Prof. R. Chandrasekar at the University of Hyderabad (UoH), India with

NET-CSIR Fellow and received her PhD degree in 2015. She finished her one year postdoctoral fellowship hosted by Prof. Gullermo Orellana at the Chemical

Optosensors Group and Laboratory, Madrid, Spain. Then she obtained the second postdoc position in IIT Bombay, India. She has published 7 research articles in peer

review journals.

Abstract:

Resistive memory devices, and in particular memories based on low-cost, solution-processable and chemically tunable organic materials, are promising alternatives explored by the industry. Such devices made from materials such as CH3NH3PbBr3, CH3NH3PbCl3 and CH3NH3PbI3, exhibit high switching voltage and thereby require higher operational power. This also leads to resistive dissipation in the form of heat, leading to overheating of the devices and adversely affects their reliability. Addressing this demand, we report the organic– inorganic hybrid perovskite materials in Resistive memory devices with a remarkable appearance of switching effect which shows high reproducibility, fast switching, excellent endurance, stability and scalability. Perovskite employed memory devices were fabricated with a simple capacitor configuration (silicon-metal–dielectric) consisting of Si/Au/CH3NH3PbX3 (X = I, Br, Cl) hybrid perovskite. The device exhibited remarkable unipolar and stable resistive switching behavior with small on–off voltage of Ë‚ 2 V. In comparison to their inorganic counterparts, one noticeable advantage of organic–inorganic hybrid perovskites lies in their facile and low temperature processability. Here, we compare three different halide hybrid perovskite I/V in different temperature, variable voltage Raman spectra, SEM, PXRD, etc. These device can be used as resistive random access memory (RRAM), based on the resistive switching (RS) effect originated from a sudden resistance change, bistable state, and volatile properties. For device fabrication, first 100 nm Au was coated on RCA cleaned Si wafer by thermal evaporator. The perovskite solution (1M, DMSO solvent) was dispensed onto the Au-Si substrate and spin-coated at 3000 RPM for 30 s in air, followed by annealing at 80 °C for 10 min. In situ Raman measurements were taken to understand the mechanism behind switching behaviour of methyl ammonium lead halide perovskite devices. The variation of Raman peak signifying that it undergoes phase transition from orthorhombic to tetragonal to cubic in LRS to HRS.

Biography:

Abstract:

The preparation process is divided into two main groups depending on the phase composition of the polycrystalline reaction product: the formation of Ln2O2S as the only polycrystalline phase and the preparation of several polycrystalline Ln2O2S phases. Based on the established chemistry of the interaction of metallic samarium with sulfur in a sealed ampoule, phase equilibria in the Sm – Sm2S3 – Sm2O3 system, the synthesis parameters of a mixture containing more than 98.5 mol.% Solid solution are determined Sm1+x S1-x ([Sm])1-y [ ]x)2x (Ñ… = 0–0,035, y = 0–1), saturated with excess samarium. According to the results of MSA, the composition of the eutectic was 65 mol% Sm3S4. The composition of the double eutectic has coordinates 0.65 Sm3S4, - 0.35 Sm2O2S and a calculated melting point of 1700K. As a result, the goal of the work was achieved.

Keywords: REE, X-ray diffraction patterns, Van Laar equation, diffractometer, kinetic properties, oxysulfide, double eutectic, phases, phase

equilibria, polycrystalline.

Biography:

Jinyuan has her expertise in evaluation and passion in improving the collagen fibers. Her use peptide induced self-assembly of collagen proteins into periodic fiber and use the sequence dependence model prediction the interaction of collagen protein. At the same time, he improved the diffusion limited aggregation model for the process of collagen self-assembly.

Abstract:

Statement of the Problem: The potential applications of recombinant bacterial collagen-like proteins are limited by lacking high order structures to form biomaterials. Findings: To improve the self-assembly ability of collagen-like proteins, we have designed collagen-like engineered proteins flanked by N- and C-terminal (PPG)10 sequences. Upon expression in E. coli, these designs self-assembled into axial D-periodic fibers with spacing matching the length of the bacterial collagen domain. Computational analysis of self-assembly has given insight into the mechanism behind the banded fiber morphology.  The interactions between collagen designs and cultured fibroblasts are being studied to determine how fiber morphology affects cell structure and viability.  This study provides a design strategy for the production of collagen proteins with functional sequences and tunable morphology for biomimetic materials in tissue engineering applications. Conclusion & Significance: The collagen proteins flanked by N- and C-terminal (PPG)10 sequence can be successfully expressed in E.coli and self-assembled into D-periodic fibers regardless of collagen-like domain. Through regulated the length of the collagen domain, we can change the length of D-periodicity. Computational analysis of self-assembly has given insight into the mechanism behind the banded fiber morphology, which utilized the most stable combination method, a full overlap of (PPG)10. The design strategy modulated the length and diversity of collagen fiber at the molecular level directly, expanding the flexibility of the collagen proteins self-assembly. 

Biography:

Abstract:

Flexible biosensors with high accuracy and reliable operation in detecting pH and uric acid levels in body fluids are fabricated using well-engineered metal doped porous carbon as electrode material. In this work, gold nanoparticles @N-doped carbon in situ are prepared using natural proteins such as wool keratin (WK) as both a novel carbon precursor and a stabilizer. The reaction parameters are optimized to control size and shape ultimately properties of composite materials. The series of composite materials were prepared and applied for the estimation of biomolecules in the biological fluids such as urine, sweat, saliva. The gold nanoparticles @N-doped which fabricated at 500 °C under customized parameters, mimics A-B type (two different repeating units) polymeric material and displays excellent deprotonation performance (pH sensitivity). Conversely, the composite carbon material with sp² structure prepared at 700 °C is doped with nitrogen and gold nanoparticles, which exhibits good conductivity and electrocatalytic activity for uric acid oxidation. These results will provide new avenues where biological material will be the best start, which can be useful to target contradictory applications through molecular engineering at mesoscale.

Biography:

Abstract:

Misfit layered compounds (MLCs) are consist of two alternating sub-lattices with different lattice constants in at least one of the directions. One can selectively alter one of the sub-lattices without affecting the structure of the other one but can tune the properties of the overall compound. Among them calcium cobaltite (Ca3Co4O9) 1 and strontium cobaltite (Sr3Co4O9) 2 are gained tremendous interest as potential thermoelectric materials in their bulk state. Bringing them to low-dimensions could drastically enhance their properties. Synthesizing them in one-dimensional structure is extremely difficult. Recently, we have synthesized cobalt-based misfit oxide nanotube3 and found out metal to semi-conductor transition from bulk to nanotube. 3 However, the yield of these nanotubes is low. Physical properties of these nanotubes have not been studied yet. Here, we present the synthesis of 1D nanaotubes (NT) from oxide misfit compounds with a very high yield (80%) by a combination of solid-state and solution-based synthesis. We have also studied their electrical properties on individual nanotube level by using electron beam lithography. To synthesize CaxCoO2 tubular (CCO) structures, we have applied conversion of high energy face-sharing cobalt octahedron (Ca3Co2O6) to relatively low-energy edge-sharing octahedron by hydrothermal synthesis. The starting material, Ca3Co2O6, is synthesized by the solid-state method using respective nitrates. By applying a similar strategy, we could synthesize nanotubes of SrxCoO2 (SCO) from Sr6Co5O15. It is found that the crystal structure widely varies in case of nanotubes from the bulk. Absorption studies show the band gap of 2.7 eV and 1.7 eV in case of CCO and SCO NTs, respectively. We have fabricated sourcedrain channels on individual nanotubes by electron beam lithography to find out the electronic properties of individual nanotube. In case of CCO nanotubes, it is found that the nanotubes are of p-type semiconductor with a high charge carrier concentration of 7.05*1019 per cm3 , which leads these NTs as a promising conductive material with a current-carrying capacity of 6.5*105 A/cm2 (for an individual nanotube). Surprisingly, in the case of SCO nanotube, it show a very high current carrying capacity of 0.8*108 A/cm2 for a single NT. These values are close to the reported WS2 NTs having a highest current capacity value of 2.4*108 A/cm2 among the inorganic nanotubes.4 Temperature dependent resistivity measurements show that both the nanotubes are semiconducting in nature. However, we have observed a voltage-induced semiconductor to metal transition in the case of SCO NT. We have observed the fourprobe resistance for the SCO nanotube to be 10 kOhm which is lowest among the existing oxide-based inorganic nanotubes. We believe electronic properties can be further tuned by changing the chemical composition between Ca/Co and Sr/Co. These results demonstrates that the high conductivity of these nanotubes could be a potential building block for future thermoelectric devices.

Biography:

Dr. Mahmoud Abdelnaby has experience and skill in reticular chemistry, nanotechnology, and organic chemistry. His efforts in these fields contribute to the fight against climate change. Abdelnaby currently works as a post-doc fellow under the Yaghi Group at KFUPM’s Center of Excellence in Nanotechnology. He completed his B.S.with honors in Chemistry, Faculty of Science, Cairo University, Egypt (2008). He earned his M. Phil in organic chemistry from the Faculty of Science, Cairo University, Egypt (2013).

Abstract:

As environmental damage continues to increase with time, research must be conducted with environmental applications in mind. TiO2 has been extensively studied for photocatalysis due to its feasible synthesis as well as its chemical and thermal stability. A main drawback of TiO2 is its large bandgap, which leads to its poor photocatalytic activity in visible light. This can be overcome by using TiO2 in conjunction with low bandgap semiconductors. Recent studies proved that doping TiO2 with copper-based material has shown to display better photocatalytic activity in visible light than pure TiO2 1,2. In this study, we synthesized Cu2S@TiO2 nano-heterostructures of different copper ratios utilizing the sonochemical method. The composites were characterized using numerous techniques. The use of the Scanning Electron Microscope showed the preservation of the structural integrity of the TiO2. Powder X-Ray Diffraction and Raman Spectra confirmed the presence of both materials and their crystalline nature. UV-Vis proved the capability of Cu2S to enhance the light absorption of Cu2S@TiO2 towards the visible region with a decrease in the bandgap up to 3.1eV. Previous research has shown the application of TiO2 for water splitting and chemical degradation via photocatalysis3,4. Sulfur doped copper nanoparticles exhibited promising applications towards a selective reduction of CO2 to formate5,6. Thus, the newly developed Cu2S@TiO2 nanocomposite has great promise of application for water splitting and CO2 reduction. Consequently, helping the cause of decreasing environmental damage.

Biography:

Abdeen Mustafa Omer (BSc, MSc, PhD) is an Associate Researcher at Energy Research Institute (ERI). He obtained both his PhD degree in the Built Environment and Master of Philosophy degree in Renewable Energy Technologies from the University of Nottingham. He is qualified Mechanical Engineer with a proven track record within the water industry and renewable energy technologies. He has been graduated from University of El Menoufia, Egypt, BSc in Mechanical Engineering. His previous experience involved being a member of the research team at the National Council for Research/Energy Research Institute in Sudan and working director of research and development for National Water Equipment Manufacturing Co. Ltd., Sudan. He has been listed in the book WHO’S WHO in the World 2005, 2006, 2007 and 2010. He has published over 300 papers in peer-reviewed journals, 200 review articles, 7 books and 150 chapters in books.

Abstract:

The move towards a de-carbonised world, driven partly by climate science and partly by the business opportunities it offers, will need the promotion of environmentally friendly alternatives, if an acceptable stabilisation level of atmospheric carbon dioxide is to be achieved. This requires the harnessing and use of natural resources that produce no air pollution or greenhouse gases and provides comfortable coexistence of human, livestock, and plants. This article presents a comprehensive review of energy sources, and the development of sustainable technologies to explore these energy sources. It also includes potential renewable energy technologies, efficient energy systems, energy savings techniques and other mitigation measures necessary to reduce climate changes.

There is strong scientific evidence that the average temperature of the earth’s surface is rising. This is a result of the increased concentration of carbon dioxide and other GHGs in the atmosphere as released by burning fossil fuels. This global warming will eventually lead to substantial changes in the world’s climate, which will, in turn, have a major impact on human life and the built environment. Therefore, effort has to be made to reduce fossil energy use and to promote green energy, particularly in the building sector. Energy use reductions can be achieved by minimising the energy demand, rational energy use, recovering heat and the use of more green energy. This study was a step towards achieving this goal.

Globally, buildings are responsible for approximately 40% of the total world annual energy consumption. Most of this energy is for the provision of lighting, heating, cooling, and air conditioning. Increasing awareness of the environmental impact of CO2, NOx and CFCs emissions triggered a renewed interest in environmentally friendly cooling, and heating technologies. Under the 1997 Montreal Protocol, governments agreed to phase out chemicals used as refrigerants that have the potential to destroy stratospheric ozone. It was therefore considered desirable to reduce energy consumption and decrease the rate of depletion of world energy reserves and pollution of the environment. This article discusses a comprehensive review of energy sources, environment and sustainable development. This includes all the renewable energy technologies, energy efficiency systems, energy conservation scenarios, energy savings and other mitigation measures necessary to reduce climate change.

Biography:

Abstract:

In this work, nickel nanoparticles (NiNPs) and graphene oxide (GO) were synthesized and characterized independently using UV-Vis, FTIR, high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) techniques. Then, a new glassy carbon electrode modified with electrochemically reduced graphene oxide decorated with nickel nanoparticles (NiNPs/ERGO/GCE) was constructed by electrodeposition. The novel platform, NiNPs/ERGO/GCE, was characterized using SEM, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). SEM analysis clearly revealed efficient incorporation of NiNPs into the graphene sheets on the surface of the electrode. The prepared platform was used for the determination of diclofenac (DIC), a nonsteroidal anti-inflammatory drug (NSAID). A significant enhancement in the peak current response for DIC was observed at the composite modified electrode compared to the unmodified electrode. The NiNPs/ERGO composite modified electrode demonstrated excellent square wave voltammetric response towards the determination of DIC in the working range of 0.25‒125 µM. The limit of detection (LOD) and limit of quantification (LOQ) of the proposed method was found to be 0.09 and 0.3 µM, respectively. The developed sensor was validated successfully for real sample analysis in pharmaceutical formulation and human urine samples with good recovery results. The proposed sensor also displayed good repeatability, reproducibility, longterm stability and selectivity towards potential interferents. Hence, it is a promising material for electrochemical sensing of diclofenac and other similar drugs and biologically active compounds in real samples.

Keywords: Nickel nanoparticles, electrochemically reduced graphene oxide, square wave voltammetry, non-steroidal anti-inflammatory drug, diclofenac

Biography:

Michalina Ehlert. I am a participant of implementation PhD studies in the field of chemistry, which I carry out both at the Faculty of Chemistry of Nicolaus Copernicus University in Toruń and in Nano-implant Ltd. The aim of my PhD thesis is to design and optimize the processes of producing nanocoatings based on titanium dioxide/titanates on the surface of metal implants produced in 3D technology and to enrich the produced systems with both chemical (silver nanoparticles, nanostructured hydroxyapatite) and biological (mesenchymal stem cells) individuals

Abstract:

Recent efforts in the field of implantology have highlighted the significance of modifying implant surface topography and biomaterial composition to improve their biocompatibility. Titanium and its alloys are commonly used as biomaterials for orthopedic, dental or neurosurgical applications. Even though titanium based implants are typically expected to last ten years or more, their longevity is not assured and the lack of integration into the bone for long-term survival often occurs and leads to implant failure. Therefore, a planned modification of the surface of the alloys is strived to obtain a highly biocompatible coating with a strictly defined structure and architecture.

The goal of the presented study was to optimize the production of titania-based biomaterials with high porosity and defined nanostructure, which supports the cell viability and growth. We assessed the bioactivity of amorphous titania coatings of different nanoarchitectures (nanoporous, nanotubular and nanosponge-like) (TNTs), produced on the surface of Ti6Al4V alloy by electrochemical oxidation. Samples were structurally and morphologically analyzed. They were also characterized in terms of wettability and mechanical properties. In-vitro biological research has been carried out of modified titanium alloy surfaces, aimed at assessing their ability to communicate with adipose derived mesenchymal stem cells (ADSC) and affect their activity. In parallel, proliferation of bone tissue cells - human osteoblasts MG-63 and connective tissue cells - mouse fibroblasts L929, as well as cell viability in cocultures (osteoblasts/ADSCs and fibroblasts/ADSCs) has been studied. The cell proliferation was studied using the MTT assay.

The results of our experiments proved that the nanoporous surface is favorable for ADSC, which produced huge amounts of extracellular matrix when they were cultured on the scaffolds alone or co-cultured with MG-63 osteoblasts. The number of osteoblasts seeded and cultured with ADSCs on TNT5 surface after 72h culture almost doubled when compared with unmodified scaffold and rose by 30% when compared with MG-63 cells growing alone.

Biography:

Manal M Kamel is a Professor of Immunology at Theodor Bilharz Research Institute (TBRI), Giza, Egypt. She has graduated from the Faculty of Medicine, Cairo University. Her Postgraduate studies were in Immunology and Clinical Pathology. She has a great experience in the fields of antigen preparation, nanotechnology, monoclonal production, CB MSCs transplantation. She has supervised (9) MSc and PhD thesis, two of them in the field of nanotechnology with stem cells and monoclonal antibodies. She has published more than 23 papers in reputed journals and has been serving as Member in the selected referee lists of: The International Journal of Immunological Studies-Cell proliferation

Abstract:

Objective: Development of new sandwich based lateral flow immunochromatographic strip (LFIS) to detect circulating Schistosoma mansoni antigen (CSA) in serum and urine samples of patients with active schistosomiasis. Methods: This highly sensitive LFIS was prepared by using anti – S. mansoni soluble egg antigen monoclonal antibody conjugated gold nanoparticles (MAb-AuNps) as a primary antibody while mobile crystalline material (MCM)-41-MAb bioconjugate was immobilized at the test line as secondary antibody. Primary and secondary antibodies formed a sandwich complex with CSA in the sample, immobilized at the test line and resulting in a distinct red color. The assay reliability was examined by using urine and serum samples of 60 S. mansoni infected patients, 20 patients with other parasites, 20 healthy individuals and results were compared with those obtained via sandwich ELISA. Results: The visual detection limit of CSA by LFIS was 3ng/ml compared to 30ng/ml low detection limit by ELISA .The sensitivity and specificity of LFIS in urine samples were 98.3% and 97.5 % respectively compared to 93.5% and 90% by ELISA. In serum samples, it was 100% and 97.5% respectively compared to 97%and 95% by ELISA

Biography:

Guldem Utkan is currently working at Marmara University, Chemical Engineering department. Her research and interest areas include graphene and its derivatives, synthesis and characterization of nanomaterials (magnetic, metallic and polymeric), composites, nanoparticle applications for bioseparation, biosensor, non-viral gene delivery, controlled drug release and use in diagnostic kits.

Abstract:

Since graphene and graphene-related materials have found many uses from electronics to health, they attract a lot of attention in various fields of science. With the use of these materials and increasing demand from the industry, scientists have begun to look for a new, scalable and environmentally friendly techniques to produce graphene. In this study, lactic acid bacteria, Lactococcus lactis and Lactobacillus plantarum, were used for the production of graphene. These bacteria are fed with graphene oxide produced from graphite by Hummer’s method, which is then converted to graphene by removing different oxide groups. Compared to existing chemical methods for producing graphene, this process requires less energy and gives a thinner and more stable material. Graphene having different physical and surface properties and different surface area thickness ratio could be produced since the reduction of functional oxide groups by using three different bacteria were provided differently and the capacity of each bacterium was different from each other.  Therefore, microbial reduction of graphene oxide appears to be a promising method for the development of new types of graphene-based materials and devices, avoiding the use of hazardous chemicals. These methods used environmentally friendly chemicals in a variety of types and applications, including nano-composites, conductive inks and biosensors.

Biography:

My name is Dovydas Karoblis. I’m a second Master’s course student at Vilnius University. In my first four years in Bachelor’s studies I was most focused on layered double hydroxide structures, their synthesis and determination. After that, my focus shifted on perovskite structure materials, expecially multiferroic manganites. In a short span of my scientific carrier I have attended several conferences (including  Open Readings 2019, Chemistry and Chemical Technology and etc.) and participated in several projects (like BUNACOMP and TransFerr). Also I have one article in Journal of Sol-Gel Science with the title Novel synthetic approach to the preparation of single-phase BixLa1−xMnO3+δ solid solutions.

Abstract:

Recently, there has been a lot of interest in multiferroic materials, which exhibit two or more “ferroic” (ferromagnetism, ferroelasticity and ferroelectricity) properties at once. Those materials offer new range of applications like AC/DC magnetic field sensors, microwave resonators, new data storage media, gyrators and etc One of those materials is YMnO3. It has a relative high Curie temperature (TC ~ 900 K) and low Neel temperature (TN ~ 70 K). It was shown, that this material can couple both ferroelectric and antiferromagnetic properties. Other perovskite type material, where magnetic and ferroelectric orders coexist is GdMnO3. It was demonstrated that synthesis of different composition solid solutions is a promising tool for tuning of physical properties of functional materials.

In this study, solid solutions of YMnO3-GdMnO3 have been synthesized using an aqueous sol-gel method. The conditions for obtaining pure single-phase compounds were determined. The thermal behaviour of precursor gels was investigated by thermogravimetric and differential scanning calorimetry (TG-DSC) measurements. X-ray diffraction (XRD) analysis was performed for the characterization of phase purity and crystallinity. Rietvield analysis was employed to calculate lattice parameters of the synthesized species. For the investigation of structural properties of obtained solid solutions by Mössbauer spectroscopy, Mn ions were partially substituted with 57Fe. Scanning electron microscopy (SEM) was employed for the estimation of morphological features. Moreover, YMnO3-GdMnO3 specimens were also characterized by FT-IR, Raman spectroscopy. Also magnetization measurements were carried out for all samples.