Keynote Speakers
Prof. Mohamed Abdel-Hady Gepreel
Prof. Mohamed Abdel-Hady Gepreel
Egypt-Japan University of Science and Technology
Speech title: Recent trends in the design, phase formation and properties of low-cost high entropy alloys
Abstract: New category of alloys is the High-entropy alloys (HEAs) that contain five or more principal elements in equal or near-equal percentages with high configuration entropy (ΔSconf > 1.5 R, where R is the gas constant). Different methodologies to design new HEAs are applied. The phase equilibrium prediction by commercial software like ThermoCalc is a useful tool for researchers. Also, the empirical relations between metastable phases formation, alloy properties and the thermodynamic parameters are widely used. Recently, machine learning and artificial intelligence techniques are being developed by many researchers to support medium and high entropy alloys’ design. One of the new HEAs which possesses a good combination of low-cost alloying elements, has single FCC solid solution structure, good cold workability and mechanical properties is Al5Cr12Fe35Mn28Ni20 alloy. The design considerations to strengthen Al5Cr12Fe35Mn28Ni20 HEA with alternating the Al, Mn, Fe and Ni content as well as thermomechanical processes will be emphasized. The role of alloying the low-cost HEAs with Si, which is a BCC stabilizer and silicide former, to improve the corrosion and oxidation resistance will be discussed. The modification of the low-cost HEAS with Ti addition to achieve higher mechanical properties at room and high temperatures will be explored as well. Finally, using artificial neural network approach in designing new medium entropy alloys with low Young’s modulus and high strength and corrosion resistance will be presented.
Short Biography:Prof. M. Gepreel got his PhD from Nagoya University, Japan in 2008. He worked in Nagoya University then Tohoku University, Japan, till 2010 when he moved to E-JUST. He works as Professor of advanced materials at E-JUST since 2019. He is specialist in alloy design and microstructure control. He worked in developing New generation of Ti-alloys for biomedical applications, Ultra-high strength Ti-alloys, Negative and zero thermal expansion alloys and recently developing new functional High entropy alloys. He received the State's Award (Egypt) in Engineering, 2014, beside 17 more national and international awards. He was visiting professors to many well-known institutes, such as; Tohoku University, Japan, IIT-Madras, India, Michigan State University, USA, Korean Basic Science Institute, Korea, Joint Institute for Nuclear Research, Russia. He supervised 16 M.Sc. and 15 PhD thesis. He shared in organizing 15 International conferences. He was invited as Keynote speaker /invited speaker for more than 20 international conferences worldwide. He had 19 funded research projects (national and international) and more than 150 publications [including filed 8 Patents, 5 Book chapters, 67 Journal papers, and 73 international conferences].
Prof. Ashanendu Mandal
Dr. Ashanendu Mandal
University of Calcutta
Speech title: Potential application of innovative solid waste materials for adsorptive removal of toxic phenol from wastewater for ensuring cleaner environment and also for generating circular economy
Abstract:This research aims for adsorptive removal of phenol from wastewaters by solid waste materials viz. guava tree bark, rice husk, neem leaves, activated carbon from coconut coir, rice husk ash, red mud, clarified sludge from basic oxygen furnace and activated alumina. The characterizations of the adsorbents are performed by SEM, XRD, FTIR and BET analyzers. The experiments of phenol removal are carried out in batch process with the variation of initial phenol concentration (5-500 mg/L), initial pH (2-12), adsorbent dose (0.10-20 gm/L), temperature (25-50°C) and contact time (30-600 min). The maximum phenol removal percentage was found with neem leaves used as adsorbent and it was 97.50%. The kinetics study shows that the pseudo-second order model is best fitted for all adsorbents except red mud. The kinetic modeling shows that the adsorption mechanism is supportive of film diffusion, intra-particle diffusion and chemisorption for all adsorbents. The isotherm analysis suggests that Freundlich isotherm model is best supportive for guava tree bark, rice husk, neem leaves, activated carbon, red mud and activated alumina, whereas Langmuir and D-R isotherm are best supportive for rice husk ash and clarified sludge respectively. The thermodynamics shows the spontaneity, randomness and endothermic/exothermic nature of the adsorption processes. The ANN modelings using Levenberg-Marquardt and Scaled Conjugate Gradient algorithms establish that the experimental and predictive data are within allowable range. The studies of scale-up designs, the regeneration of adsorbents and the safe disposal of used adsorbents show that these adsorbents can be used for commercial applications. Further, the column study of phenol removal is also carried out using the most efficient batch adsorbent neem leaves. The study concludes that the wastewater treatment for ensuring cleaner environment is commercially possible using solid waste materials as adsorbents, which in turn can also generate circular economy.
Short Biography: Ashanendu Mandal has graduated as B. Sc in Chemistry and B. Tech in Chemical Engineering from University of Calcutta. He has got his M. Tech Degree in Chemical Engineering from IIT, Kharagpur. He has acquired MBA degree in Finance from IGNOU, New Delhi and has undertaken an Advanced Management Program from IIM Calcutta. He has also acquired the Degree of Ph. D. (Tech) in Chemical Engineering from University of Calcutta. Dr. Mandal has worked in ONGC for more than 34 years and his experience includes commissioning, modifications, safety, operations, artificial lifts, pressure maintenance, EOR and planning in offshore and onshore oilfields. He has also vast experience in marketing of upstream and downstream petroleum products. Dr. Mandal has published technical papers in Chemical Weekly and research papers in many international journals. He has visited more than 25 countries for attending training programs and for participating in international conferences as invited speaker or panelist. Dr. Mandal is a lifetime member of Indian Chemical Society and Indian Science Congress.
