期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 72, 期 1, 页码 45-49出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2010.10.086
关键词
Amorphous materials; Surfaces; Sol-gel growth; Electron microscopy
资金
- Board of Research in Nuclear Sciences (BRNS), Department of Atomic Energy (DAE), Mumbai, Government of India [2007/37/18/BRNS/604]
- CSIR, New Delhi
Water is one of the most affecting chemicals that can cause damage to the solid surface. To protect the surface due to the action of water, the surface should be made hydrophobic. In the present study, the improvement in hydrophobicity of silica films using metal acetylacetonate (M-acac) by employing heat treatment to methyltrimethoxy silane (MTMS) based silica coatings is reported as a novel attempt. Instead of following the established trends of the surface derivatization or co-precursor method, iron acetylacetonate Fe(acac)(3), copper acetylacetonate Cu(acac)(2) and heat treatment were used to incorporate hydrophobicity with silica coatings. As M-acac is readily soluble in organic solvents, Fe(acac)(3) and Cu(acac)(2) were dissolved in methanol (MeOH) and their concentration was varied from 0 to 0.025 M. The coating solution was prepared by optimizing molar ratio of MTMS:MeOH:basic H2O to 1:7.15:6.34, respectively. Gelation time (t(g)) for Cu(acac)(2) containing silica sol and that containing Fe(acac)(3) were noted to be 30 and 55 min, respectively. The substrates were taken out after gelation and heat treated at 150 degrees C for 2 h. The heat treated films showed a dramatic increase in the static water contact angle from 82 degrees to as high as 142 degrees. (C) 2010 Elsevier Ltd. All rights reserved.
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