| 학회 |
한국화학공학회 |
| 학술대회 |
2006년 봄 (04/20 ~ 04/21, 대구 인터불고 호텔) |
| 권호 |
12권 1호, p.924 |
| 발표분야 |
재료 |
| 제목 |
The Effect of Surface Modification on the Dispersion Stability of Alumina Nanoparticles in Transformer Oil |
| 초록 |
The transformer oils with dispersed nano-sized(〈20㎚) alumina particles were prepared by mechanical milling and hydrophobic surface modification. The agglomerated alumina nanopowders, diameters from ㎛ to ㎜, were ground in a vertical super-fine grinding mill and surface-treated with oleic acid. The surface characteristics of modified nanoparticles were analyzed by FTIR spectroscopy. It showed that the hydrophobicity of nanoparticles was caused by esterification between hydroxyl groups on the particle surface and functional groups of the oleic acid. The dispersion stability of modified nanoparticles in oils was investigated by stability analyzer which was performed with the centrifugal force. The results indicated that the dispersion stability was highly affected by the surface modification conditions. In the surface modification procedure, elimination of H2O as a byproducts of esterification and excess oleic acid which did not form stable chemical bonds with powder surface is very important to get a high dispersion stability. |
| 저자 |
조강옥1, 송현우2, 최 철2, 오제명2
|
| 소속 |
1충남대, 2한전 전력(연) |
| 키워드 |
Nanofluids; Dispersion; Surface Modification; Transformer Oil
|
| E-Mail |
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| 원문파일 |
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