选用油酸(OA)、硬脂酸(SA)和12-羟基硬脂酸(HAS) 3种脂肪酸在正辛烷溶液中分散纳米铋粉.用紫外可见光分光光度计表征了脂肪酸修饰后的粉体在正辛烷溶液中的分散稳定性.结果表明:3种脂肪酸都能将粉体表面改性成Bi-脂肪酸型疏水性表面;悬浮液的分散稳定性随着分散剂在粉体表面吸附量的增多而增强,12-羟基硬脂酸在纳米铋粉表面吸附量最大,其悬浮稳定性最好;脂肪酸对悬浮液的稳定机制是,不仅能减小粉体间的范德华吸引力而且能产生一定的空间位阻作用.
Three types of fatty acids-oleic acid, stearic acid, and 12-hydroxystearic acid-were used to disperse nano-sized bismuth powders in octane solvents. The surface characteristics of bismuth powders were modified to be hydrophobic in nature, and the bismuth-fatty acid formed on the surface. Stability property of the suspension was measured by ultraviolet-visible spectrophotometer. Results indicate that better suspension stabilization can be achieved when the 12-hydroxystearic acid is used. Adsorption behavior reveals that a greater affinity at the solid/liquid interface occurred for the 12-hydroxystearic acid than that for stearic acid or oleic acid. This observation suggests that the adsorption of 12-hydroxystearic acid may lead to a better packing of the acid molecules onto the solid surface than others and also results in better suspension stability. It is also evidenced by the results of theoretical calculation of potential energies that the colloidal stability of organic bismuth suspension is caused by fatty acid reducing the attractive interparticle potential and by steric repulsion mechanism.
参考文献
| [1] | Lu K;Kessler C .Colloidal dispersion and rheology study of nanoparticles[J].Journal of Materials Science,2006(17):5613-5618. |
| [2] | Lee E H;Lee M K;Rhee C K .[J].Materials Science Forum,2007,534-536(01):117. |
| [3] | 江成军,段志伟,张振忠,王超.不同表面活性剂对纳米银粉在乙醇中分散性能的影响[J].稀有金属材料与工程,2007(04):724-727. |
| [4] | 殷波,张振忠,高建卫,周建秋,张少明.油酸对金属纳米镍、铜及铜镍复合粉体的分散性能影响[J].铸造技术,2006(02):105-107. |
| [5] | Liu D M .[J].Journal of the American Ceramic Society,1999,82(05):1162. |
| [6] | Doroszkowski A;Lambourne R .[J].Journal of Polymer Science Part C:Polymer Letters,1971,65:252. |
| [7] | Bergstrom L.;Tomiyama H.;Mizutani N.;Shinozaki K. .COLLOIDAL PROCESSING OF A VERY FINE BATIO3 POWDER - EFFECT OF PARTICLE INTERACTIONS ON THE SUSPENSION PROPERTIES, CONSOLIDATION, AND SINTERING BEHAVIOR[J].Journal of the American Ceramic Society,1997(2):291-300. |
| [8] | 高建卫,张振忠,张少明.直流氢电弧等离子体蒸发法制备Cu-Ni纳米复合粉体[J].铸造技术,2005(04):261-263,267. |
| [9] | Liu, JC;Jean, JH;Li, CC .Dispersion of nano-sized 7-alumnina powder in non-polar solvents[J].Journal of the American Ceramic Society,2006(3):882-887. |
| [10] | 高濂;孙静;刘洋桥.纳米粉体的分散及表面改性[M].北京:化学工业出版社,2003 |
| [11] | 任俊;卢寿慈;沈健.颗粒分散科学与技术[M].北京:化学工业出版社,2003 |
| [12] | Sato T;Ruch R;江龙.聚合物吸附对胶态分散体稳定性的影响[M].北京:科学出版社,1988 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%