COMPETITIVE ADSORPTION OF POLYMER AND SURFACTANTS ON SOLID SUBSTRATES

Citation
Bm. Moudgil et Ts. Prakash, COMPETITIVE ADSORPTION OF POLYMER AND SURFACTANTS ON SOLID SUBSTRATES, Colloids and surfaces. A, Physicochemical and engineering aspects, 133(1-2), 1998, pp. 93-97
Citations number
8
Categorie Soggetti
Chemistry Physical
ISSN journal
09277757
Volume
133
Issue
1-2
Year of publication
1998
Pages
93 - 97
Database
ISI
SICI code
0927-7757(1998)133:1-2<93:CAOPAS>2.0.ZU;2-J
Abstract
Polymer and surfactant adsorption on substrates has important applicat ions in a variety of fields such as solid-solid separations, dispersio n and flocculation of particulate suspensions, and controlled drug del ivery systems. In pharmaceutical applications coating of different mol ecules in controlled amounts on a given carrier substrate may be desir ed to achieve the necessary efficacy of the drug molecules. On the oth er hand, the concept of different substrates (e.g., minerals) competin g for a given polymer/surfactant molecule is governing phenomena for p hysicochemical separation processes such as selective flocculation and flotation. Selective flocculation process involves selective adsorpti on of flocculant (high molecular weight polymer) on the flocculating c omponent of the mixture. Modifications in the substrate properties (e. g., charge density, wettability), polymer characteristics (e.g., molec ular weight, charge density, wettability) and solvent properties (e.g. , pH, ionic strength, temp.) may all be employed to achieve the floccu lant adsorption only on the desired component of the particulate mixtu re. Confining the adsorption of a flocculant to the desired complement of the particulate mixture using site blocking agents (SBAs - low mol ecular weight polymers) is discussed. (C) 1998 Elsevier Science B.V.