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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。
The dispersion behavior of nano-TiN in water and the influence of polyethyleneimine (PEI) on the dispersion were studied by measuring the sedimentation volume and viscosity. The dispersion of the surface was measured by Zeta potential. The results showed that the pH value had a great effect on the dispersibility of nano-TiN in water. The isoelectric point was about 5.2. The dispersibility in alkaline environment was better than that in acidic environment. At pH = 10, Dispersion effect, corresponding to the highest absolute value of Zeta potential, indicating that the dispersion of nano-TiN in water follow the electrostatic stability mechanism. The study also found that PEI has an important influence on the dispersion behavior of nano-TiN in water. PEI can further improve the dispersion of the slurry. The suitable addition amount is 0.0614% (mass fraction). PEI not only changes the charged nature of the particle surface but also increases the absolute value of Zeta potential. PEI to improve the dispersion due to steric steric effect.