[en] Upon addition of silica to aqueous solutions of poly(ethylene oxide)-b-poly(epsilon-caprolactone) copolymers (PEO-b-PCL) and sodium dodecyl sulfate (SDS), adsorption of the solutes occurs at the silica-water interface. The amount of the adsorbed constituents has been measured by the total concentration depletion method. Small-angle neutron scattering experiments (SANS) have been carried out to investigate the structure of the adsorbed layer. Although SDS is not spontaneously adsorbed onto hydrophilic silica, adsorption is observed in the presence of PEO-b-PCL diblocks, in relation to the relative concentration of the two compounds. Conversely, SDS has a depressive effect on the adsorption of the copolymer, whose structure at the interface is modified. Copolymer desorption is however never complete at high SDS content. These observations have been rationalized by the associative behavior of PEO-b-PCL and SDS in water.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering Chemistry
Author, co-author :
Vangeyte, Patrick; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Leyh, Bernard ; Université de Liège - ULiège > Department of Chemistry > Laboratoire de dynamique moléculaire
De Clercq, C.; Université de Liège - ULiège > Department of Chemistry > Laboratoire de Dynamique Moléculaire
Auvray, Loïc; Laboratoire Léon Brillouin (Saclay) and University of Evry, France > Laboratoire des Matériaux Polymères aux Interfaces (Evry)
Misselyn-Bauduin, Anne-Marie; Université catholique de Louvain (UCL)
Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Concomitant adsorption of poly(ethylene oxide)-b-poly(epsilon-caprolactone) copolymers and sodium dodecyl sulfate at the silica-water interface
Publication date :
16 August 2005
Journal title :
Langmuir
ISSN :
0743-7463
eISSN :
1520-5827
Publisher :
Amer Chemical Soc, Washington, United States - Washington
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