GENERAL PHASE AND RHEOLOGICAL BEHAVIOR OF SILICA PEO/WATER SYSTEMS/

Authors
LIU SF LEGRAND V GOURMAND M LAFUMA F AUDEBERT R
Citation
Sf. Liu et al., GENERAL PHASE AND RHEOLOGICAL BEHAVIOR OF SILICA PEO/WATER SYSTEMS/, Colloids and surfaces. A, Physicochemical and engineering aspects, 111(1-2), 1996, pp. 139-145
Citations number
12
Categorie Soggetti
Chemistry Physical
Journal title
Colloids and surfaces. A, Physicochemical and engineering aspects → ACNP
ISSN journal
09277757
Volume
111
Issue
1-2
Year of publication
1996
Pages
139 - 145
Database
ISI
SICI code
0927-7757(1996)111:1-2<139:GPARBO>2.0.ZU;2-R
Abstract
Provided the molecular weight of the polymer is high enough (10(6) or higher), near-equilibrium bridging flocculation of silica sphere suspe nsions by poly(ethylene oxide) (PEG) can be observed at high pH (8 or above) and low ionic strength (10(-2) M or below). A diphasic zone, li mited by a closed loop, is observed. Its boundaries are highly depende nt on several parameters such as the pH, ionic strength and size of th e particles. Various and often unusual rheological behaviour is encoun tered across the different domains of the phase diagram. This behavior is closely related to the degree of polymer adsorption and the polyme r to particle size ratio.