کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1516683 | 1511577 | 2011 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Enhancement in hydrophobicity of silica films using metal acetylacetonate and heat treatment Enhancement in hydrophobicity of silica films using metal acetylacetonate and heat treatment](/preview/png/1516683.png)
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 (tg) 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 °C for 2 h. The heat treated films showed a dramatic increase in the static water contact angle from 82° to as high as 142°.
Journal: Journal of Physics and Chemistry of Solids - Volume 72, Issue 1, January 2011, Pages 45–49