氮化钛在水介质中的分散
Dispersion of TiN in aqueous media.
作者信息
Zhang Jingxian, Duan Liping, Jiang Dongliang, Lin Qingling, Iwasa Mikio
机构信息
National Institute of Advanced Industrial Science and Technology, AIST Kansai, Osaka 563-8577, Japan.
出版信息
J Colloid Interface Sci. 2005 Jun 1;286(1):209-15. doi: 10.1016/j.jcis.2005.01.009.
The dispersion of TiN powders in aqueous media was studied through XPS, zeta potential, adsorption, sedimentation, and rheology measurements. XPS showed that there are TiO2, TiN, and TiOxNy sites on the TiN particle surface. In the absence of dispersant, the isoelectric point (pH(IEP)) of the TiN particles was at pH 2.2. Based on the surface properties of TiN particles, a cationic polymer, polyethylene imine (PEI), was selected as a dispersant. In the presence of PEI, the pH(IEP) shifted from pH 2.2 to pH 11.10. It was evidenced that TiN slurries could be stabilized around pH 9.50 with 1-2 wt% PEI as dispersant. Subsequently, TiN slurries with solid content as high as 57 vol% were developed and exhibited dilatant rheological behavior at high shear rate. The results showed that PEI is an effective dispersant for TiN in aqueous media.
通过XPS、zeta电位、吸附、沉降和流变学测量研究了TiN粉末在水介质中的分散情况。XPS表明，TiN颗粒表面存在TiO2、TiN和TiOxNy位点。在没有分散剂的情况下，TiN颗粒的等电点（pH(IEP)）为pH 2.2。基于TiN颗粒的表面性质，选择了阳离子聚合物聚乙烯亚胺（PEI）作为分散剂。在PEI存在的情况下，pH(IEP)从pH 2.2移至pH 11.10。有证据表明，以1-2 wt%的PEI作为分散剂时，TiN浆料在pH 9.50左右可以稳定。随后，开发了固体含量高达57 vol%的TiN浆料，并在高剪切速率下表现出膨胀流变行为。结果表明，PEI是TiN在水介质中的有效分散剂。
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