서지주요정보
혼합 알콕시실란으로부터 제조된 건조 겔의 구조와 특성 및 겔 막에 도입된 Disperse orange 25의 열적 안정성 = Structures and properties of dried gels prepared form the mixture of alkoxysilanes and the thermal stability of disperse orange 25 incorporated into the gel film
서명 / 저자 혼합 알콕시실란으로부터 제조된 건조 겔의 구조와 특성 및 겔 막에 도입된 Disperse orange 25의 열적 안정성 = Structures and properties of dried gels prepared form the mixture of alkoxysilanes and the thermal stability of disperse orange 25 incorporated into the gel film / 황영주.
저자명 황영주 ; Hwang, Young-Ju
발행사항 [대전 : 한국과학기술원, 1993].
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소장정보

등록번호

8003865

소장위치/청구기호

학술문화관(문화관) 보존서고

MCHE 93013

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Tetraethoxysilane (TEOS) and diethoxydimethylsilane (DEDMS) with ethanol and water were used as starting materials to prepare a gel by the sol-gel method. In order to find the film formation condition of sol, the sol was coated on a slide glass with its viscosity range of 5-10 centipoises and then the thermal stability of Disperse Orange 25 in gel matrix was investigated. The film thickness was ranged from 0.4 to 2 μm by controlling the compositions of starting materials. The structures and physical properties the of gels were also investigated by measuring the bulk density, nitrogen adsorption and FTIR spectroscopy. The bulk density became lower by the addition of DEDMS, which would be resulted from the methyl group interrupting the shrinkage and the ring formation of DEDMS. From the test of nitrogen adsorption,it was recognized that micropores rather than macropores formed mainly in the gel. All the sols showed the transition behaviors from Newtonian to shear thinning with the increase in the sol concentration by the vaporization. The transition would be caused by the agglomeration of polysilicate particles. A nonlinear optical material, Disperse Orange 25, was added to the sol, coated on a ITO glass, and poled during the drying process. The order parameter of DO25 molecules in the gel film was calculated from UV absorbance spectrum as an indirect measure of thermal stability and compared with that in the organic polymer film including the poled DO25 molecules. The order parameter of DO25 molecules in the gel film was diminished more slowly than that in the polymeric film. The order parameter abruptly increased above threshold field strength (7.5 KV). When poling time increased from 40 to 60 min, the absorbance intensity was unchanged. From this result, it was shown that the gelation of sol coated on ITO glass took place before 40 min.

서지기타정보

서지기타정보
청구기호 {MCHE 93013
형태사항 viii, 70 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Young-Ju Hwang
지도교수의 한글표기 : 정인재
지도교수의 영문표기 : In-Jae Chung
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 68-70
주제 Colloids.
Filmstrip.
Polymers.
콜로이드. --과학기술용어시소러스
박막. --과학기술용어시소러스
고분자. --과학기술용어시소러스
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