Korea Institute of Science and Technology

Dae Ki Choi

Hyoung-Juhn Kim

Jong Hyun Jang

Dirk Henkensmeier

So Young Lee

Jin Young Kim

Jonghee Han

Suk Woo Nam

Sung Jong Yoo

Tae Hoon Lim

Suk-Woo Nam

Eun Ae Cho

Chang Won Yoon

Myung-Suk Chun

Eun Ki Kim

Min Suk Shim

Disclosed are a method for preparing a pure isophthalaldehyde bisulfite adduct free from impurities through a specific purification process, and use thereof as a starting material for polymerizing polybenzimidazole under a mild condition. According to the present disclosure, it is possible to obtain a pure isophthalaldehyde bisulfite adduct free from impurities, such as unreacted materials or byproducts. In addition, it is possible to accomplish industrial mass production of a high-molecular weight polybenzimidazole by using the adduct as a starting material for polymerizing polybenzimidazole under a mild condition in an organic solvent.

Pure isophthalaldehyde bisulfite adduct and novel preparation method thereof

Provided is poly(benzimidazole-co-benzoxazole) having polybenzimidazole to which benzoxazole units are introduced, as a polymer electrolyte material. The polymer electrolyte material has both high proton conductivity and excellent mechanical properties even when it is obtained by in-situ phosphoric acid doping. The polymer electrolyte material may substitute for the conventional phosphoric acid-doped polybenzimidazole in a polymer electrolyte membrane fuel cell, particularly in a high-temperature polymer electrolyte membrane fuel cell.

Poly(benzimidazole-co-benzoxazole) and method for preparing the same

Disclosed is a micro power cell capable of being applied as an energy source and utilizing a streaming potential phenomenon occurring in accordance with an electrokinetic principle when an electrolyte aqueous solution flows in the microchannels piled up in several layers. The streaming potential cell consists of a PDMS microfluidic-chip fabricated by MEMS process as well as micromachining technology. The microfluidic-chip is formed with multi microchannels radially arranged in parallel with each other around a center of a disk at a regular interval. The disk type multi microchannel can achieve uniform inflow and outflow effects. According to the invention, there is provided a cell device comprising a pile-up chip having a number of disk type microfluidic-chips with the optimal structure of flow-in and flow-out of a fluid, a distributor, a collector, an electrode insertion part, etc.

Electrokinetic micro power cell using pile-up disk type microfluidic-chip with multi-channel

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Seoul, South Korea

Dae Ki Choi