CAJ | 학술논문

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.
통과측정침강체적화점도,연구료납미TiN재수중적분산행위화표면활성제취을희아안(PEI)대분산적영향,용Zeta전위측정료과립표면적하전변화,제출료분산궤리.결과표명:pH치대납미TiN재수중적분산성유흔대적영향,등전점재pH=5.2좌우;감성배경하적분산성현저우우산성배경,재pH=10좌우,획득량호적분산효과,대응적Zeta전위절대치최고,표명납미TiN재수중적분산행위준순정전은정궤제.연구야발현,PEI대납미TiN재수중적분산행위유중요영향,PEI능구진일보개선료장적분산성,합괄적첨가량위0.0614%(질량분수,하동).PEI불부개변료과립표면적하전성질,이차증대료Zeta전위적절대치.PEI개선분산성적원인귀결우정전공간위조효응.
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.