INTERACTION BETWEEN POLY(N-VINYL-2-PYRROLIDONE) AND ANIONIC HYDROCARBON FLUOROCARBON SURFACTANT ON HYDROPHOBIC GRAPHITE/

Authors
Citation
H. Otsuka et K. Esumi, INTERACTION BETWEEN POLY(N-VINYL-2-PYRROLIDONE) AND ANIONIC HYDROCARBON FLUOROCARBON SURFACTANT ON HYDROPHOBIC GRAPHITE/, Journal of colloid and interface science, 170(1), 1995, pp. 113-119
Citations number
30
Categorie Soggetti
Chemistry Physical
ISSN journal
00219797
Volume
170
Issue
1
Year of publication
1995
Pages
113 - 119
Database
ISI
SICI code
0021-9797(1995)170:1<113:IBPAAH>2.0.ZU;2-I
Abstract
The adsorption of poly(N-vinyl-2-pyrrolidone) (PVP), lithium dodecyl s ulfate (LiDS), and lithium perfluorooctanesulfonate (LiFOS) from PVP-L iDS and PVP-LiFOS binary mixed solutions on hydrophobic graphite has b een investigated by measuring the adsorbed amount, ESR spectra, and ze ta potential. The adsorption of PVP is enhanced in the presence of LiD S at low LiDS concentration due to formation of a surface complex of P VP and LiDS, followed by a decrease at high LiDS concentration. Howeve r, this increment on hydrophobic graphite is significantly smaller tha n that on hydrophilic alumina. A similar trend is observed in the PVP- LiFOS system. In both PVP-LiDS and PVP-LiFOS systems, the conformation of PVP adsorbed is estimated using a spin-labeled PVP and is changed gradually from loops and tails to trains with the surfactant concentra tion. The fraction of train segments in the PVP-LiFOS system is greate r than that in the PVP-LiDS system over the whole surfactant concentra tion region. (C) 1995 Academic Press, Inc.