Artigo
Rheological properties of tin oxide suspensions
Fecha
2002-08-01Registro en:
Journal of the European Ceramic Society, v. 22, n. 8, p. 1297-1306, 2002.
0955-2219
10.1016/S0955-2219(01)00440-X
WOS:000175329300014
2-s2.0-0036680765
Autor
Universidade Federal de São Carlos (UFSCar)
Universidade Federal da Paraíba (UFPB)
Universidade Estadual Paulista (Unesp)
Resumen
The rheological properties of tin oxide slurries were studied experimentally and theoretically. The deflocculants used were ammonium polyacrilate (PAA) and the copolymer poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate) (PVB-PVA-PVAc), in water and ethanol, respectively. The amount of deflocculant was optimized for different solid contents by means of viscosity measurements. In spite of the high stability of PVB-dispersed slurries, a high solid concentration was not obtained. On the other hand, a slurry with a 56.4 vol.% of solids was attained when PAA was used. A theoretical study of the adsorption of PAA in its dissociated (basic solution) and non-dissociated (acidic solution) forms on SnO 2 (110) is presented. This analysis was made by means of the PM3 method using a large cluster Sn 15O 28 for the surface model. The calculated adsorption energy is larger for the ionized PAA than for the non-ionized form, indicating that alkaline slurries favor PAA adsorption on the SnO 2 surface. © 2002 Elsevier Science Ltd. All rights reserved.