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Langmuir. 2005 Jan 18;21(2):617-21.

Interfacial rheological studies of gelatin-sodium dodecyl sulfate complexes adsorbed at the air-water interface.

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  • 1Department of Polymer Science and Department of Polymer Engineering, The University of Akron, Akron, Ohio 44325, USA. ashwinbrao@gmail.com


The dilational rheological behavior of gelatin molecules adsorbed at the air-water interface has been studied as a function of sodium dodecyl sulfate (SDS) concentration for a 7 wt % gelatin-SDS solution at 40 degrees C. Binding of SDS molecules to the gelatin strands disrupts the cross-linked network structure of adsorbed gelatin molecules and results in a reduction of the surface elastic modulus of the adsorbed layer that continues until the bulk SDS concentration reaches 1 mM. Beyond this SDS concentration, the dilational rheological properties of the adsorbed gelatin layer are indistinguishable from those of pure SDS adsorbed layers.

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