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  • 08월 28일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

Ice and Like-Ice: Challengeable and Mysterious Material

2008년 8월 22일 20시 09분 11초
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목 09시 : 40분
저자 및
Huen Lee
Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology (KAIST) 373-1 Guseong-dong yuseong-gu, Daejeon 305-701, Republic of Korea, Korea

Ice appears in nature in forms as varied as snowflakes and hail, icicles, glaciers, pack ice, and entire polar ice caps. It is an important component of the global climate, particularly in regard to the water cycle. Furthermore, ice has numerous cultural applications, from the ice cooling one's drink to winter sports and ice sculpture. Called methane hydrate, or gas hydrate, it's an ice-like substance composed of methane, the main constituent of natural gas, trapped inside cages of water molecules. It forms under pressure, with deposits found underneath permafrost in Arctic regions and beneath deep ocean floors. But flammable ice is a fair description of the planet's most abundant, if least recognized, form of fossil energy.

At moderate temperature and pressure conditions small guest molecules are entrapped in pure ice powders to form the mixed icy hydrate materials, followed by ion inclusion in confined empty ice-cages. For the complete accomplishment of anion transfer the ions or electrons are migrated through ice lattice, establishing the powerful and highly efficient ionic transport. First of all, the pure ice is transformed to the ionized ice by imprisoning ionic species into the confined space of icy cages. As the first attempt we synthesize the ionic icy materials (IIM) containing energy gases such as H2 and CH4. The formed IIMs are recommended to exhibit high ionic conductivity comparable to Nafion, a commercial electrolyte, and high capacity for storing energy gases. A variety of ionic icy materials will be tested until we find the best one with amazing performance. The unique behavior of IIM is deeply examined to prove its promising application to highly sensitive energy devices. For the first time we attempt to establish energy storage and production systems as icy nano-reactors in which the active reactions between active ice lattice and active guest molecules or between active guest molecules can take place. More significantly, the novel design and synthesis of reactive icy hydrates are expected to open a new field for inclusion chemistry and ice-based science and technology. The return after success might be quite surprising and unimaginable. The energy-related breakthrough technologies will significantly overcome the critical limitations of the existing future energy approaches.