纳米粒子悬浮液中分散剂选择的实验研究

Experimental investigation of dispersant selection for preparing nano-particle suspension fluids

针对纳米粒子比表面积大、表面能高、在水中易自动团聚下沉的特点,提出了选择分散剂的一些建议,并对体积分数为2%、4%、5%、8%的纳米Cu、Ag、TiO2粒子悬浮液分别进行了实验.结果表明:将聚乙烯醇和十二烷基苯磺酸钠配合使用能够有效地将各种体积分数的纳米Cu、Ag粒子稳定分散在水中;但是无论是聚乙烯醇,还是十二烷基苯磺酸钠都不能使体积分数为8%的TiO2粒子稳定悬浮在水中;在实验范围内,纳米铜粒子的体积分数对悬浮液的稳定性影响不大.

Abstract. Some suggestions on selection of dispersants were proposed against the characteristics of nanos- ized particles such as their large specific surface, high surface energy, and easiness of self-agglomeration and settlement in water. Subsequent experiments were conducted on selection of dispersants in suspensions with nanosized particles of copper, silver and titanium dioxide of volumetric fractions of 2~, 4~, 5~, and 8~ respectively. The results indicate that, using the mixture of polyvinyl alcohol and sodium dodecyl- benzenesulfonate-6 as the solvant, the nanosized copper and silver particles of above volumetric fractions can be effectively suspended in water for over 100 and 24 hours, respectively. However, the nanosized ti- tanium dioxide particles can not be suspended in water with either polyvinyl alcohol, or sodium dodecyl- benzenesulfonate-6, or combination of both as the solvant. The volumetric fraction of nanosized particles has little effect on the stability of the suspended fluids within the experimental range.