COLL 145 |
| Eric W Kaler1, Beth A. Schubert1, Norman J. Wagner1, Dganit Danino2, and Belgin Baser1. (1) Chemical Engineering, University of Delaware, Colburn Lab, 150 Academy St, Newark, DE 19716, (2) Department of Food Engineering and Biotechnology, Technion, Technion City, Haifa, 32000, Israel |
| Alkyl polyglucosides are sugar-based nonionic surfactants that are used in consumer products, but their phase behavior in water limits applications. This limitation can be overcome by the addition of small amounts of an ionic surfactant, which also allows direct manipulation of micellar surface charge. Here we report on the phase behavior, microstructure and rheology of mixtures of dodecyl-b-monoclucoside (C12G1) with sodium dodecyl sulfate (SDS). The addition of C12bG1 to SDS gives an overall maximum in zero-shear viscosity, resulting from the formation, growth, and branching of wormlike micelles. Cryo-TEM reveals distinctly different morphologies on either side of the viscosity maximum, with dense network-like structures evident close to the phase boundary with a lamellar phase. These experimental results are placed within the framework of existing theories for the growth of charged micelles, with the resulting microstructure resulting from a balance between the endcap, electrostatic and branching energies. |
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Symposium in Memory of Arthur W. Adamson
2:00 PM-5:40 PM, Monday, March 29, 2004 Marriott -- Orange County 4, Oral
Division of Colloid and Surface Chemistry |