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졸-겔법에 의한 단분산 실리카 cap-ZnO미립자의 제조

Preparation of Monodispersed Silica cap-ZnO fine Powder by Sol-Gel Method

이창우 함영민

Lee CW Hahm YM

HWAHAK KONGHAK, December 1998, 36(6), 863-871(9), NONE

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Abstract

본 연구에서는 부정형인 ZnO 입자를 핵물질로 사용하고, ZnO 입자 주위의 코팅물질로는 TEOS[tetraethyl ortho-silicate, purity 98%]를 사용하여 졸겐법을 이용한 마이크로 캡슐화를 행하였다. 용매로는 에탄올을, 촉매로는 암모니아를 사용하였다. 이때 TEOS에 대한 용매, 촉매 및 물의 몰조성과 ZnO의 양, 반응온도에 따른 실리카 cap-ZnO 미립자의 크기와 형태에 미치는 영향을 검토하였으며, 이렇게 제조된 실리카 cap-ZnO 미립자의 표면 전기적 특성과 UV 흡수 특성변화에 대하여 고찰하였다. 연구결과 실리카 cap-ZnO 구형입자의 크기를 조절할 수 있었으며, 이때 응집이 없는 단분산의 실리카 cap-ZnO 구형입자의 크기는 0.26-0.78 μm 범위이고 표준편차는 0.020-0.063 μm으로 입도분포가 매우 좁음을 알 수 있었다.

Monodispersed silica cap-ZnO powders were prepared by Sol-Gel processing and their surface electrical and UV absorbance properties were investigated. Pseudomorph ZnO fine powders were microcapsuled by SiO₂ sol fabricated using TEOS[tetraethyl orthosilicate, purity 98%] and ethanol as a solvent with NH ₃ catalyst. The effect of experimental parameters such as molar ratio of starting materials, concentration and reaction temperature on the final particle size and shape of silica cap-ZnO powder was discussed. As a result, we could controlled the size of monodispersed silica cap-ZnO spherical powders without agglomeration. It was also shown good dispersibility in aqueous solution. The obtained powders were observed to have the mean particle size of 0.26-0.78 μm and standard deviation of 0.020-0.063 μm.

Keywords

Monodispersed Silica cap-ZnO Powders Sol-Gel Processing Microcapsuled UV Absorbance

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