Title: Dispersion of nanoscale BaTiO3 suspensions by a combination of chemical and mechanical grinding/mixing processes
Authors: Ying, Kuo-Liang
Hsieh, Tsung-Eong
Department of Materials Science and Engineering
Keywords: BaTiO3;nanometer-scale dispersion;chemical;dispersant;nanogrinding
Issue Date: 5-Nov-2007
Abstract: The colloidal stability of aqueous nanometer- and micrometer-scale barium titanate (BaTiO3) utilizing poly (methacrylic acid) (PMAA-Na) and polyacrylamide/(alpha-N,N-dimethyl-N-acryloyloxyethyl)ammonium ethanate (PDAAE) was investigated. In addition to chemical dispersants, the effects of mechanical milling using either conventional ball milling or nanogrinding/-mixing on the dispersion of BaTiO3 suspensions were also studied. Characterization of the particle size distribution (d(50)), viscosity, and morphology of BaTiO3 particles in the suspensions revealed that a sole chemical dispersant or mechanical milling was insufficient to achieve nanometer-scale dispersion. The best dispersion results were obtained with a combination of PMAA-Na dispersant and nanogrinding/-mixing, which could provide sufficient electronic repulsive force and shear force to disperse the 80-nm BaTiO3 powders uniformly in the aqueous suspension. (C) 2007 Wiley Periodicals, Inc.
URI: http://dx.doi.org/10.1002/app.24935
ISSN: 0021-8995
DOI: 10.1002/app.24935
Volume: 106
Issue: 3
Begin Page: 1550
End Page: 1556
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