Keynote Speakers

Abstract

Keynote 1Prof. Ke Wang, East China University of Technology, Nanchang, ChinaSpeech Title:Magnetic and Perpendicular Exchange Coupling Properties of Rare-earth Transition Metal Alloy Films:In this talk, we will present some work we are carrying out on perpendicularly magnetized rare-earth transition metal alloy films (e.g., TbFeCo or Gd FeCo), which are currently attracting more attention for applications in low-power spintronic devices, ultrafast switching and logic memories. The perpendicular exchange coupling properties of TbFeCo/GdFeCo hard/soft bilayers are systematically investigated and some new results will be presented.Keynote 2Prof. Rangsu Liu, Hunan University, ChinaSpeech Title:Visualizing Study for Formation, Evolution and Hereditary Mechanisms of Nano-Clusters during Solidification Processes of Liquid Alloy under High Pressures:In recent years, we have deeply investigated the solidification processes of liquid metals of Al, Ag, Cu, Mg Na, Pb, Zn and alloys of Mg-Zn, Mg-Y, Al-Mg, Al-Zn, Ca-Zn by molecular dynamics simulation for the systems with different sizes of 100,000, 1,000,000 and 10.000,000 atoms, respectively. By using the visualizing method, the formation, evolution and hereditary mechanisms of nano-clusters, especially, under high pressures the large-scale microstructurel evolution, the crystallization and the hereditary mechanisms during their solidification processes have been clearly analyzed and described by the cluster type index method (CTIM) proposed by authors. Recently, many important results obtained. Highly interesting, for liquid alloy Mg-Y, it is found that all the simulation systems are directly solidified into crystal structures, and the crystallization temperature Tc is enhanced almost linearly with the increase of pressure. Highly interesting, there is an important phase transformation point from FCC to BCC structures between 15 ~ 20GPa during the solidification processes. And the structures formed at 20GPa possess the admirable microstructure configurations and excellent mechanical properties of materials.Keynote 3Prof. Chen Hsu, Lungwha University of Science and Technology, TaiwanSpeech Title:Small Molecular Sensing with Graphene, Zinc oxide, and Zinc Oxalate:Small molecules such as hydrogen and methane are able to be sensible using graphene, zinc oxide (ZnO), and zinc oxalate (ZnC2O4) via Van der Waals force. First of all, graphene is generally regarded as to have the function of adsorbing hydrogen molecules, but in really the adsorbing effect is not fit the demand. Graphene does not have the function of attracting hydrogen molecules. Graphene does not have the function of bullying hydrogen molecules. The main reason is that its plane is fully occupied by functional group. The graphene reduction exhibits many defect structures and residual oxidized groups, so even if many reduction methods are proposed, it is impossible to obtain a structure close to the perfect lattice of graphene. The basal plane and the edge of the reduced graphene oxide will contain a large number of oxygen functional groups; epoxy (C=O) and hydroxyl (hydroxyl, C)-OH is formed on the base surface, and carboxyl groups (COOH) and carbonyl groups (CO, CO) are distributed at the boundary.Keynote 4Prof. Chen-Kuei Chung, Department of Mechanical Engineering, National Cheng Kung University, TaiwanSpeech Title:Fabrication and Characteristics of Nanoporous Anodic Aluminum Oxide at High Temperature:The nanoporous anodic aluminum oxide (AAO) is one important nano-template used for synthesis of nanocomposite materials or as an etching mask for pattern transfer in a variety of applications. Conventional AAO templates were synthesized using two-step potentiostatic method of direct current anodization (DCA) at low temperature (0-10°C) to avoid dissolution effect. In this talk, an effective method of hybrid pulse anodization (HPA) with normal-positive and small-negative voltages has been proposed for AAO synthesis at relatively high temperature of 15-25°C for enhancing performance of AAO structure for both the cheap low-purity (99%) and costly high-purity (99.997%) aluminum foils. The pore size distribution and circularity of AAO by HPA is much better than DCA due to its effective cooling at relatively high temperature. The HPA not only merits manufacturing convenience and cost reduction but also promotes pore characteristics of AAO at severe conditions of cheap low-purity Al foils and high temperature. Moreover, the pore diameter can be enlarged by wet etching. A new finding of AAO pore diameter highly linked to the electrolyte anions contaminated AAO prepared by HPA at low-to-high concentrations (0.3~0.9 M) of oxalic acid at 25°C. The increase of widened diameter decreased with concentration due to AAO walls containing more anions high oxalic acid concentration to decrease etching rate during widening. Some application in humidity sensing and SERS will be presented.