only a Japanese version



2013年2月18日(月)14:20 理学研究科Z302講義室

Modelling the interface of water with insulating surfaces
Prof. Adam Foster
Department of Applied Physics
Aalto University, Helsinki, Finland

Surface science techniques, and particularly high-resolution Scanning Probe Microscopy (SPM) approaches, now offer unprecedented levels of understanding and control of solid/vacuum interfaces. By contrast, the physics of liquid/solid interfaces is less developed, although it is much more relevant for real-world applications. It is important in such diverse fields as heterogeneous catalysis, next generation battery technology and corrosion. The solid/liquid interface is also particularly relevant to biological systems, where measurements are made in physiological conditions. In this work we apply first principles and atomistic simulation approaches to study how water interacts with a variety of insulating surfaces, providing atomic-scale insight into hydration structures, dissolution and high-resolution imaging.

FM-AFM study of calcite (104) surface in solutions
Hirotake Imada

Department of Chemistry
Kobe University, Japan

The dissolution and deposition of calcite attract attention in relation to the biomineralization. In the present study, (104) wafers of calcite were immersed in the solutions of water, ethanol, or propanol. The topography of the substrate and the structure of the solutions at interfaces were probed with frequency-modulation atomic force microscopy (FM-AFM). The interfacial solution structure was modified by the presence of the alcohols, while the topography of the substrate remained intact.

The surface-interfacial science for lithium ion battery
Mitsunori Kitta
Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology (AIST), Japan

Rechargeable lithium-ion batteries are used for many portable electric devices such as cell phones and laptop computers. Recently, a lot of efforts are concentrated on the development of large-scale high-power lithium-ion batteries for electric or hybrid electric vehicles. In lithium-ion batteries, one of the key issues is to understand and control the electrochemical reactions at electrode/electrolyte interfaces. It is crucial to clarify the interfacial structures and reactions at the atomic scale. For this purpose, we are engaged in the surface and interface studies of lithium titanium oxides (Li4Ti5O12; LTO), which is one of the most promising anode materials for high-power lithium-ion batteries. In this talk, we show our recent results of preparation of well-defined LTO surfaces for atomistic studies of surfaces and electrolyte/LTO interfaces [1].

[1] M. Kitta, T. Akita, Y. Maeda, M. Kohyama Appl. Surf. Sci. 258 (2012) 3147– 3151.