Confinement of a hydrophilic polymer in membrane lyotropic phases

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:331

Article

Lopez-Esparza, R.¹  Guedeau-Boudeville, M. A.²  Maldonado, A.¹  Ober, R.³  Urbach, W.⁴ 

[1] Univ Sonora, Dept Fis, Hermosillo 83000, Sonora, Mexico

[2] Univ Paris Diderot, CNRS, Lab Mat & Syst Complexes, UMR 7057, Paris, France

[3] Coll France, Phys Mat Condensee Lab, F-75231 Paris, France

[4] Ecole Normale Super, Phys Stat Lab, F-75231 Paris, France

关键词: Surfactants;    Polymers;    Diffusion;    Interaction;    SAXS;    FRAPP;   

DOI  :  10.1016/j.jcis.2008.11.020

来源: Elsevier

【 摘 要 】

We Study the confinement of a hydrophilic polymer (polyethylene glycol or PEG) between the bilayers of the zwitterionic surfactant tetradecyldimethyl aminoxide (C(14)DMAO). Small angle X-ray scattering and electron microscopy experiments show that the polymer modifies the physical properties of the lyotropic smectic (L-alpha) phase. The observed effects are similar to those reported for anchored hydrophobically-modified polymers, indicating a strong interaction between PEG and the C(14)DMAO bilayers. Self-diffusion experiments performed in the lyotropic sponge (L-3) phase show that the polymer adsorbs onto the surfactant membranes. This adsorption explains earlier observations: high polymer concentrations decrease the Gaussian rigidity of the membranes and a vesicular phase is stabilized. (C) 2008 Elsevier Inc. All rights reserved.

【 授权许可】

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