벤젠 유기물 도입에 따른 실리카 기반 에어로겔의 소수성 및 기계적 특성 연구

김태희; 이지훈; 박형호; 최하령; WANG QI; Rushikesh P. Dhavale

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벤젠 유기물 도입에 따른 실리카 기반 에어로겔의 소수성 및 기계적 특성 연구

Study on the Hydrophobicity and Mechanical Properties of Silica-Based Aerogel by Introducing Organic Benzene

김태희|이지훈|박형호|최하령|WANG QI|Rushikesh P. Dhavale

한국마이크로전자및패키징학회 (The Microelectronics And Packaging Society)|2020.12|마이크로전자 및 패키징학회지 (Jornal of the Microelectronics and Packaging Society)|제27권 제4호|pp. 135-141

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mechanical property sol-gel hydrophobic benzene-bridged textural property

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초록

실리카-벤젠 에어로겔은 균일하고 정렬된 네트워크 기공 구조, 개선된 기계적 특성을 갖도록 합성되었다. 실리카 에어로겔의 기계적 특성을 향상시키기 위해 유기물을 첨가하는 것이 일반적인 방법이지만, 기공 특성이 유-무기 상분리 현상으로 인해 감소한다. 본 연구에서는 실리카 기반 에어로겔의 기공 특성을 유지하면서 동시에 기계적 물성을 높이기 위해 간단하고 저렴한 방법을 사용하였다. 기공 및 기계적 특성에 대한 하이드록실 결합수의 영향을 연구하기 위해 두가지 유형의 벤젠 브리지 전구체를 사용하였다. 다공성 실리카 에어로겔은 간단하고 비용-효율적이며 무공해인 졸-겔방법으로 제조되었다. 최종적으로 제조된 실리카-벤젠 에어로겔은 추가적인 silylating reagents없이 우수한 기공 특성, 높은비 표면적(1,326 m2/g), 다공성 구조 및 소수성(>140°)을 가졌다. 일부 샘플(2T4)의 경우 기계적 강도는 순수 실리카 에어로겔의 5 배 이상을 보였다.

Abstract

The silica aerogels with benzene-bridged were designed to have uniform network structure, ordered pore structure, improved mechanical properties and excellent textural properties. Adding organic to enhance the mechanical properties of silica aerogels is a common method, but textural properties of aerogels with organic are reduced due to the organic-inorganic phase separation. In this paper, we use a simple and low-cost method to increase mechanical properties while maintaining textural properties of SiO2 aerogels. Two types of benzene-bridged precursors were prepared to study the effect of the number of hydroxyl band on the textural and mechanical properties. The porous silica aerogel was prepared by a simple, cost effective and pollution-free sol-gel method. This method does not require additional silylating reagents. The benzene-bridged silica aerogel samples prepared had excellent textural properties, high specific surface area (1,326 m2/g), porous structure and hydrophobicity (>140°). The mechanical strength of 2T4 is more than 5 times that of pure silica aerogel.

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