纳米TiN在水中的分散行为研究

稀有金属材料与工程, 2009, 38(z2): 1105-1108.

纳米TiN在水中的分散行为研究

丰平 ^1, , 郑立允 ^2, , 李晓贺 ^3, , 张晓明 ^4, , 赵玉玲 ^5,

1.三峡大学,湖北,宜昌,443002

2.河北工程大学,河北,邯郸,056038

3.三峡大学,湖北,宜昌,443002

4.三峡大学,湖北,宜昌,443002

5.三峡大学,湖北,宜昌,443002

基金项目: 湖北省教育厅自然科学研究重点项目(200713005)

关键词：纳米TiN , 分散性 , PEI , Zata电位

Dispersity of Nano TiN in Water

Feng Ping ^1, , Zheng Liyun ^2, , Li Xiaohe ^3, , Zhang Xiaoming ^4, , Zhao Yuling ^5,

1.三峡大学,湖北,宜昌,443002

2.河北工程大学,河北,邯郸,056038

3.三峡大学,湖北,宜昌,443002

4.三峡大学,湖北,宜昌,443002

5.三峡大学,湖北,宜昌,443002

Keywords： nano TiN , dispersity , polyethylene imine (PEI) , Zeta potential

通过测定沉降体积和粘度,研究了纳米TiN在水中的分散行为和表面活性剂聚乙烯亚氨(PEI)对分散的影响,用Zeta电位测定了颗粒表面的荷电变化,提出了分散机理.结果表明:pH值对纳米TiN在水中的分散性有很大的影响,等电点在pH=5.2左右;碱性环境下的分散性显著优于酸性环境,在pH=10左右,获得良好的分散效果,对应的Zeta电位绝对值最高,表明纳米TiN在水中的分散行为遵循静电稳定机制.研究也发现,PEI对纳米TiN在水中的分散行为有重要影响,PEI能够进一步改善料浆的分散性,合适的添加量为0.0614%(质量分数,下同).PEI不仅改变了颗粒表面的荷电性质,而且增大了Zeta电位的绝对值.PEI改善分散性的原因归结于静电空间位阻效应.

Disperse behavior of nano TiN in water and the effect of surfactant polyethylene imine (PEI) on dispersity were investigated by sedimentation and viscosity measure, charge variation on particle surface was analyzed through Zeta potential, and the dispersion mechanisms were suggested. Results showed that pH value and dispersant PEI concentration have significant effect on dispersity for nano TiN dispersed in water. Isoelectric point is about pH = 5.2. Optimal dispersitive effect is obtained when PEI concentration is about 0.0614wt% with pH = 4.02. PEI changes charged property on the surface of particle. Electrostatic stability mechanism associates with the disperse behavior of nano TiN dispersed in water, electrostatic-steric effect contributes to the dispersity improved by PEI.

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