THE HAMAKER COEFFICIENT FOR TITANIUM-DIOXIDE (RUTILE) IN LIQUID-MEDIA

Authors
BUSCALL R
Citation
R. Buscall, THE HAMAKER COEFFICIENT FOR TITANIUM-DIOXIDE (RUTILE) IN LIQUID-MEDIA, Colloids and surfaces. A, Physicochemical and engineering aspects, 75, 1993, pp. 269-272
Citations number
8
Categorie Soggetti
Chemistry Physical
Journal title
Colloids and surfaces. A, Physicochemical and engineering aspects → ACNP
ISSN journal
09277757
Volume
75
Year of publication
1993
Pages
269 - 272
Database
ISI
SICI code
0927-7757(1993)75:<269:THCFT(>2.0.ZU;2-T
Abstract
The Hamaker coefficients for rutile across water and dodecane are calc ulated from optical data. At contact a value of 15.6kT at 298 K (0.064 aJ) is obtained in water; the value for dodecane is rather similar at 14kT. These values are less than one-half of that obtained in vacuo ( 38kT). The asymmetric case of rutile/water (or dodecane)/polystyrene ( or poly(methyl methacrylate) (PMMA)) is also considered (4.6kT for wat er, 3.1kT for dodecane). The effect of coatings on the Hamaker coeffic ient of rutile pigments is also discussed.