Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/68664
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Type: Journal article
Title: Laser light scattering and isothermal titration calorimetric studies of poly(ethylene oxide) aqueous solution in presence of sodium dodecyl sulfate
Author: Dai, S.
Tam, K.
Citation: Journal of Colloid and Interface Science, 2005; 292(1):79-85
Publisher: Academic Press Inc Elsevier Science
Issue Date: 2005
ISSN: 0021-9797
1095-7103
Statement of
Responsibility: 
Sheng Dai and Kam Chiu Tam
Abstract: The aqueous solution of poly(ethylene oxide) (PEO) in the presence of different concentrations of sodium dodecyl sulfate (SDS) was examined by laser light scattering and isothermal titration calorimetric techniques. A small fraction of PEO aggregates were found to coexist with unimeric PEO chains in dilute solution. The presence of monovalent salt does not alter the hydrodynamic properties of PEO in aqueous solution. Addition of a monovalent anionic surfactant, such as SDS, induces cooperative binding of surfactant monomers to PEO backbones at SDS concentrations ranging from 4.0 mM (critical aggregation concentration) to 16.5 mM (saturation concentration). The hydrodynamic radius of PEO unimers decreases initially and then increases with SDS concentration, resulting from the structural reorganization of the PEO/SDS complex. Beyond the saturation concentration, the hydrodynamic radii of PEO/SDS complex are independent of SDS concentration.
Keywords: Poly(ethylene oxide); SDS; dynamic light scattering; isothermal titration calorimetry; aggregation
Rights: © 2005 Elsevier Inc. All rights reserved.
RMID: 0020112539
DOI: 10.1016/j.jcis.2005.05.079
Appears in Collections:Chemical Engineering publications

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