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  • 02월 23일 15시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

Cationic Polymers for Biosilicification on the Surface

등록일
2009년 3월 3일 14시 30분 47초
접수번호
1566
발표코드
금26K6구 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 11시 : 10분
발표형식
구두발표
발표분야
유기화학 - Oral Presentation for Young Organic Chemists
저자 및
공동저자
양성호, 최인성
KAIST 화학과, Korea

Diatoms are a plankton, whose shells are made of silica. Their ability to make silica structures, biosilicification, has been of interest in nanotechnology and materials sciences,  because biosilicification occurs under ambient conditions at slightly acidic pH values, and the degree of complexity of the resulting nanometer-scale structures has never been matched by artificial materials. Biosilicification in diatoms is achieved by specific interactions between silicic acid derivatives and cationic polypeptides named silaffins containing long-chain polyamines. Biosilicification, therefore, has mainly been achieved by controlling the structure of cationic polymers.  Quaternized poly(2-(dimethylamino)ethyl methacrylate) films formed by surface-initiated atom transfer radical polymerization were chose as a synthetic counterpart of the long-chain polyamines in silaffins. Counteranion exchange controlled the structure of the silica films. In addition, we demonstrated that poly(2-(dimethylamino)ethyl methacrylate) film could be used for the formatio of nonbiogenic oxide thin films, such as TiO2.

On the other hand, the spatio- and chemoselective deposition of silica was achieved on the poly(diallyl dimethyl ammonium chloride) film formed by layer-by-layer processes.  With a help of the physiological conditions of the layer-by-layer processes and biosilicification, a living cell was individually encapsulated by silica without loss of viability.

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