表面活性剂系统的空间和时间控制。

Spatial and temporal control of surfactant systems.

作者信息

Liu Xiaoyang, Abbott Nicholas L

机构信息

Department of Chemical and Biological Engineering, University of Wisconsin, 1415 Engineering Drive, Madison, WI 53706-1691, United States.

出版信息

J Colloid Interface Sci. 2009 Nov 1;339(1):1-18. doi: 10.1016/j.jcis.2009.07.006. Epub 2009 Jul 7.

Abstract

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 (>20mN/m) and spatially localized ( approximately 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.

摘要

本文综述了在实现表面活性剂体系时空控制方法方面的一些最新进展。这些方法围绕氧化还原活性和光敏感表面活性剂的使用展开。文中介绍了一些实验的观点,这些实验实现了对水性表面活性剂体系界面性质的主动控制、对本体溶液中形成的微观结构和纳米结构的可逆控制,以及对表面活性剂与聚合物、DNA和蛋白质相互作用的原位操纵。本综述特别关注含有氧化还原活性基团二茂铁的两亲分子的研究——二茂铁氧化态的可逆控制会导致这些两亲分子的电荷/疏水性发生变化,从而使其自组装发生显著改变。含有偶氮苯的光敏感表面活性剂是本综述的第二个重点,偶氮苯在光照下会发生形状/极性变化。文中给出了氧化还原活性和光敏感表面活性剂的例子,它们能在数秒的时间尺度上使表面张力产生大于20mN/m的大幅且空间局部化(约毫米级)变化。还描述了允许本体溶液纳米结构进行可逆转变的体系,如胶束到囊泡的转变或单体到胶束的转变。这些新型两亲分子的广泛潜在用途体现在能够驱动表面活性剂体系功能性质的变化,如流变性质和油的可逆增溶,以及能够控制表面活性剂与生物分子的相互作用以调节它们向细胞内的转运。

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