纳米TiN粉末在水溶液和无水乙醇中的分散行为

通过粒径和颗粒表面电性质的测定，探讨了纳米TiN粉末在水溶液和无水乙醇中的分散特性及表面活性剂对分散的影响. 实验结果表明，纳米TiN颗粒在水中分散，溶液的pH值对颗粒的分散性有很大的影响，在pH 8处，能得到最好的分散效果. 随pH值变化，颗粒表面的荷电性质从正变化为负，等电点为3.7. 其分散行为遵循双电层静电稳定机制. 纳米TiN颗粒在无水乙醇中的分散行为受pH值的影响相对较小. 在整个pH范围内，颗粒表面荷正电，颗粒表面的溶剂化作用对分散起主导作用. 表面活性剂聚氧乙烯十二烷基醚可作为纳米TiN颗粒在水溶液中分散的分散剂，聚乙二醇可作为在水溶液和无水乙醇中分散的分散剂.

Dispersion Behavior of Nanosized TiN Powder in Water and Absolute Ethyl Alcohol

By means of the measurement of particle size and z potential of particles, the dispersion of TiN nanoparticles and the effect of surfactants on the dispersion in water and absolute ethyl alcohol were investigated. It was revealed that pH value had a strong influence on the dispersibility for TiN nanoparticles in water, and at pH=8, dispersed result was optimal. With the increase of pH, the carried charge of particles was altered from positive to negative state, and IEP equaled 3.7. The dispersibility followed the mechanism of electrostatic stabilization. However, the pH value had a week effect on the dispersibility of TiN nanoparticles in absolute ethyl alcohol, in the whole range of pH, the particles carried positive charges. Solvent layer dominated the dispersibility. Surfactant polyoxyethylene do-decyl ether might be acted as dispersant in water, and polyethylene glycol as dispersant in water and absolute ethyl alcohol.