Photogelling fluids based on light-activated growth of zwitterionic wormlike micelles
Photogelling fluids based on light-activated growth of zwitterionic wormlike micelles
复制标题
DOI：
10.1039/b809452g
复制
发表时间：
2009-01-01
期刊：
影响因子：
3.4
通讯作者：
Raghavan, Srinivasa R.
中科院分区：
文献类型：
--
作者：
Kumar, Rakesh;Raghavan, Srinivasa R.
使用简单、廉价的化学物质创造具有光可调神学性质的流体是我们实验室最近的一个重点。这种流体可用于从传感器到微流体阀的各种应用。为此，我们在本文中报告了一类表现出“光凝胶”的含水流体，即在暴露于光下时流体粘度大幅（10,000倍）增加。这种粘度的增加是由样品中蠕虫状胶束的光激活生长引起的。上述液体中的关键成分是两性离子表面活性剂，芥子基二甲基酰胺丙基甜菜碱（EDAB）和光响应分子，反式邻甲氧基肉桂酸（OMCA），两者都是市售的。OMCA与EDAB结合，当两者以高（bbb2: 1） OMCA与EDAB的摩尔比结合时，在水溶液中形成短柱状胶束。经紫外线照射后(
The creation of fluids with light-tunable theological properties using simple, inexpensive chemicals has been a recent focus of our laboratory. Such fluids could be useful in applications ranging from sensors to microfluidic valves. Towards this end, we report in this paper a class of aqueous fluids that exhibit "photogelling", i.e., a substantial (10 000-fold) increase in fluid viscosity upon exposure to light. Such an increase in viscosity is triggered by the light-activated growth of wormlike micelles in the sample. The key components in the above fluids are the zwitterionic surfactant, erucyl dimethyl amidopropyl betaine (EDAB) and the photoresponsive molecule, trans-ortho-methoxy-cinnamic acid (OMCA), both of which are commercially available. OMCA binds to EDAB, and when the two are combined at high (>2 : 1) OMCA : EDAB molar ratios, short cylindrical micelles are formed in aqueous solution. Upon irradiation by UV light (