Preparation of monodispersed plate-like particles of tungstic acid |
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Authors: | A B D Brown S M Clarke A R Rennie |
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Institution: | (1) Polymers and Colloids Cavendish Laboratory Madingley Road Cambridge, CB3 0HE United Kingdom, GB;(2) Industrial Materials Group Department of Crystallography Birkbeck College Malet street London WC1E 2BH United Kingdom, GB |
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Abstract: | To understand the properties of colloidal dispersions it is often vital to prepare model materials with particles that have
a small polydispersity in order to make experimental tests of theories or models. However few preparations have been developed
that yield anisotropic particles with a narrow size distribution and precise shape. In this paper the preparation of a dispersion
of charge stabilized, tungstic acid particles is described. The particles are rectangular and have a length of 7.0 μm, a width
of 2.8 μm and a thickness of 0.2 μm. The polydispersity is 8% in length and 10% in width, making it one of the most monodisperse
dispersions of anisotropic particles. Each particle is monocrystalline and the crystal orientation is fixed with respect to
the particle morphology. Some interesting behavior is observed: these particles aggregate perpendicular and parallel to each
other to give flat, ordered flocs when the stability is reduced.
Received: 22 January 1998 Accepted: 4 February 1998 |
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Keywords: | Disc-shaped particles colloidal dispersion flocs tungsten oxide |
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