Spatial and temporal control of surfactant systems

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:339

Article

Liu, Xiaoyang¹  Abbott, Nicholas L.¹ 

[1] Univ Wisconsin, Dept Chem & Biol Engn, Madison, WI 53706 USA

关键词: Surfactants;    Active control;    Self-assembly;    Redox-active surfactants;    Light-sensitive surfactants;    Spatial and temporal control;    Ferrocene;    Azobenzene;    Photosensitive;   

DOI  :  10.1016/j.jcis.2009.07.006

来源: Elsevier

【 摘 要 】

This paper reviews some recent progress on approaches leading to spatial and temporal control of surfactant systems. The approaches revolve around the use of redox-active and light-sensitive surfactants. Perspectives are presented on experiments that have realized approaches for active control of interfacial properties of aqueous surfactant systems, reversible control of microstructures and nanostructures formed within bulk solutions, and in situ manipulation of the interactions of surfactants with polymers, DNA and proteins. A particular focus of this review is devoted to studies of amphiphiles that contain the redox-active group ferrocene - reversible control of the oxidation state of ferrocene leads to changes in the charge/hydrophobicity of these amphiphiles, resulting in substantial changes in their self-assembly. Light-sensitive surfactants containing azobenzene, which undergo changes in shape/polarity upon illumination with light, are a second focus of this review. Examples of both redox-active and light-sensitive surfactants that lead to large (>20 mN/m) and spatially localized (similar to mm) changes in surface tensions on a time scale of seconds are presented. Systems that permit reversible transformations of bulk solution nanostructures - such as micelle-to-vesicle transitions or monomer-to-micelle transitions - are also described. The broad potential utility of these emerging classes of amphiphiles are illustrated by the ability to drive changes in functional properties of surfactant systems, such as rheological properties and reversible solubilization of oils, as well as the ability to control interactions of surfactants with biomolecules to modulate their transport into cells. (C) 2009 Elsevier Inc. All rights reserved.

【 授权许可】

Free