Day 1 :
Keynote Forum
Mohammad Banyan
Kuwait Institute for Scientific Research, Kuwait
Keynote: Application of cold spraying technique for catalyzing cold rolled metal rods with Ni for use as a metal hydride solid storage medium
Biography:
M. Banyan is a Research Assistant working with the Department of Nanotechnology and Advanced Materials at Kuwait Institute for Scientific Research, KISR. He completed his Bachelors study in Mechanical Engineering from Cleveland State University.
Abstract:
Utilization of hydrogen energy in real applications comes with many challenges like solving problems faced in the field of hydrogen storage. Solid state hydrogen storage is suitable for overcoming some of the problems present in other storage methods. Mg metal is a cheap solid-state hydrogen storage medium with high hydrogen capacity and operational cost effectiveness. Because of its poor hydrogenation/dehydrogenation kinetics and high values of decomposition temperature and apparent activation energy, MgH2 has not been employed in real fuel cell applications yet. The present work reports for the first time application of cold spray coating for doping plastically deformed Mg-strips by different concentrations of fine Ni powders. For present study, Mg rods were cold-rolled for 300 passes and then coated by Ni fine powders, using a cold spray process operated at 150_C under high argon gas pressure. The Ni powders were pelted into Mg-substrate through a high-velocity jet at a speed of 500 m/s. Under these preparation conditions, Ni powders were plastically deformed at the surface of Mg strips to create numerous pores and cavities which worked as a hydrogen diffusion gateway. The as-coated Mg sheets with 3-Ni layers (5.28 wt%) possessed good hydrogenation/dehydrogenation kinetics, implied by a short absorption/desorption time (5.1/11 min) of 6.1 wt% hydrogen at 150_C/10 bar and 200_C/200 mbar, respectively. The fabricated solid-state hydrogen storage nanocomposite strips revealed good cyclability of achieving 600 cycles at 200_C without failure of degradation.
Keynote Forum
Moussa Camara
Keynote: Comparison of the effect of Poly (N-vinyl caprolactam) and Poly (N-isopropylacrylamide) trimers on the stability of hydrated Na-montmorillonite: A molecular dynamics study
Biography:
Moussa Camara is well-known author in the field of Clay and Clay Minerals, Clay Polymer Nanocomposites and Drilling and Completion Fluids Chemistry for over 6 years and currently pursuing a Ph.D. in Rheological Control Mechanisms of Poly (N-vinyl caprolactam) in Water Based Drilling Fluids in the department of Oil & Gas Well Engineering at China University of Petroleum (East China). He graduated from Felix Houphouet Boigny University (Ivory Coast) with a Bachelor and Master degree in Physical Sciences, then a Master of Oil & Gas Well Engineering (Drilling and Completion Fluids Chemistry) from China University of Petroleum (East China). He has published four (4) original articles in journals such as Applied Clay Sciences, Molecular Simulation, Polymer, and Material Sciences & Engineering in the area of molecular dynamics simulation, clay and clay minerals stability in humid environment, polymer clay nanocomposites, drilling and completion fluids chemistry, and wellbore stability. He is currently working in the area of polymer nanocomposites; water based drilling fluid system for deep-water drilling and completion. His research interest include in polymer nanotechnology, especially thermosensitive polymers. x
Abstract:
In the current study, we performed a Molecular Dynamics (MD) simulation of the intercalation of poly (N-isopropyl acrylamide) (NIPAM)3 and poly (N-vinylcaprolactam) (NVCL)3 trimers into Na-montmorillonite (Na-Mt) to evaluate their effect on the interlayer structure and the stability of hydrated Na-Mt. The impact of both trimers on the interlayer species and their dynamics properties at different temperature in a canonical ensemble (NVT) were investigated. The results showed that the electrostatic forces exerted by Na cations on H2O molecules and the interlayer H2O molecules arrangement are not affected by the rise in temperature after adding both trimers. Trimers addition reinforced the structure of interlayer H2O molecules so that the effect of temperature increase on them became negligible. The structural dynamics evolution of the radius of gyration of both trimers showed the existence of conformation changes when temperature increased. These conformational changes are more complex in the case of (NVCL)3 than (NIPAM)3 due to its large monomers. Both trimers reduced the mobility of interlayer particles with a better inhibition effect obtained for (NVCL)3 compared to (NIPAM)3. The concentration profile of interlayer’s species showed the affinity of Na cations for clay mineral surfaces while H2O molecules moved away. Compared these two trimers, the most stable state of Na-Mt is achieved with (NVCL)3. These results could help highlight the inhibition properties of (NIPAM)3 and (NVCL)3 on hydrated Na-Mt and to predict its stability against environmental condition changes.
Keynote Forum
Munkhbayar Baatarsukh Gyeonsang
Keynote: Phase stablilty and properties of Ti-nb-zr thin films and their dependence on Zr addition
Biography:
Munkhbayar Baatarsukh received the B.S degree of science from the National University of Mongolia with major in petroleum chemicals, 2015 and the M.S degree of material production engineering at the age of 25 years from Gyeongsang National University (South Korea), 2018. Before joining Gyeongsang National University, he worked at the Petroleum Transhipment Facility SOC in Mongolia. His research focus is related to Ni-free Ti-based shape memory thin film alloy and passion to remove hypersensitivity nickel element from biomaterials or replaces them with non-toxic biocompatible elements. He has published 3 papers about Ti-based SMA in reputed journals during M.S degree.
Abstract:
Shape memory alloys are commonly used for various applications, e.g. aerospace, automotive, robotics and biomedical. Presence of low Young’s modulus and biocompatibility factors are two important criteria in biomedical applications. Although Ti-Ni SMAs are commercialized, however, due to the possibility of hypersensitivity of Ni, the β type Ti-based SMAs have been developed and investigated as a potential replacement of Ti-Ni alloys in biomedical applications. The β type titanium alloys attracted to attention for biomedical because of their low stiffness, good corrosion resistance, biocompatible, and superelasticity. The binary Ti-(12.2-35.9)Nb at.% and ternary Ti-Nb-(3.6-12.7)Zr at.% thin-film alloys were prepared by magnetron sputtering method. The structures of the thin films were analyzed by EDS and SEM. Phase constitutions were confirmed by XRD. Mechanical properties of the Ti-Nb-Zr thin film specimens were investigated by nanoindentation test. In bulk, in order to control porous structure, there is used to space holder (NH4HCO3) in sintering method. However, in the present porous structures were observed in some ternary thin film alloys. We expected to porous structure dependent on Zr composition. The Young’s modulus of ternary thin films (80-95Gpa) lower than binary alloys (108-123GPa). The Young’s modulus decreases with the addition of Zr elements for the ternary alloys. The d-electron alloy theory is an effective method of designing titanium alloys with Young’s modulus proposed by Morinaga. The results for Young’s modulus confirms that the d-electrons alloy theory holds for these ternary alloys. Furthermore, we discussed the comparing results of the binary Ti-Nb and Ti-Nb-Zr ternary thin films.
- Advanced Materials| Materials Science
Session Introduction
Wei Cui
Wei Cui, Northeast Petroleum University, China
Title: Numerical simulation of the interference effect of double cracks in X80 pipeline weld
Biography:
Mainly engaged in the field of ferromagnetic functional materials damage and fracture mechanics research, chaired the national natural science foundation, China postdoctoral foundation and other projects.
Abstract:
A multi-field coupling method based on virtual crack closure is proposed to detect weld crack propagation in X80 pipeline by magnetic flux leakage method, in order to analyze the interference effect of double cracks. Under the dynamic application of fluid pressure, crack initiation and propagation cause the change of weld structure of pipeline, and then affect the distribution of magnetic field in the surrounding computational domain. Every time the fluid pressure load is increased, the crack increment is completed, the crack geometry is updated, the grid is reconstructed, and the crack growth calculation and magnetic field analysis are carried out circularly. Taking the collinear double crack growth in the heat affected zone as a numerical simulation example, the finite element models of the single crack propagation in the outer wall of the pipe weld and the single crack propagation in the inner weld of the pipe are established respectively for comparative analysis. The results show that according to the characteristic values of fluid pressure, crack tip energy release rate, crack growth length, and peak value of magnetic induction intensity component, which are needed to describe crack growth in the propagation results, the process of crack growth is accelerated due to the interference effect of collinear double cracks. The realization of this method can provide technical reference for the fracture analysis of multi-crack long-distance oil and gas pipeline weld, and also provide a theoretical basis for the safety assessment of the weld seam with multiple cracks in oil and gas pipeline.