Adsorption property of citrate dispersant on BaTiO3 particles in aqueous solution
- 64 Downloads
Dispersion behavior of ultra fine BaTiO3 particles in the aqueous solution of ammonium citrate (NH4-CA) or citric acid lanthanum chelate (NH4-La-CA) was investigated. The dispersion property was characterized with sedimentation value. It is easier to obtain well dispersed slurry with NH4La-CA than NH4-CA. In an attempt to better understand the role of citric acid radical, simulation of the dispersant adsorption on BaTiO3 particle was performed with universal force field (UFF). It is demonstrated that the interaction between citric acid radical and BaTiO3 particle surface is a weak chemical adsorption. Trivalent citric acid radical is adsorbed on BaTiO3 particle surface with maximal adsorption energy. And, larger molecules of NH4-La-CA formed by adding La3+ lead to better dispersion property than NH4-CA.
Key wordscitrate dispersant BaTiO3 adsorption
Unable to display preview. Download preview PDF.
- RAPPÉ A K, CASEWIT C J, COLWELL K S, et al. UFF, a full periodic table force field for molecular mechanics and molecular dynamics simulations[J]. J Am Chem Soc, 1992, 114: 1002410029.Google Scholar
- ZHEN S L. Surface Modification of Power [M]. Beijing: China Building Materials Press, 2003. (in Chinese)Google Scholar
- ZHAO Z G. Colloid and Surface Chemistry[M]. Beijing: Chemical Industry Press, 2003: 9. (in Chinese)Google Scholar
- ZHANG D L, GONG S P, ZHOU D X. Speciation in electroless nickel solutions for BaTiO3-based PTCR ceramics and the roles of complexing agents[J]. Electronic Component and Materials, 2000, 19(1): 17–19. (in Chinese)Google Scholar