Manipulation of small particles at solid liquid interface: light driven diffusioosmosis.
Manipulation of small particles at solid liquid interface: light driven diffusioosmosis.
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DOI：
10.1038/srep36443
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发表时间：
2016-11-03
影响因子：
4.6
通讯作者：
Santer S
中科院分区：
文献类型：
--
作者：
Feldmann D;Maduar SR;Santer M;Lomadze N;Vinogradova OI;Santer S
亚微米尺寸的颗粒对表面的强粘附对于从表面去除污染胶体和有意识地操纵颗粒以产生和测试新的微米/纳米级组件两者都是有害的。使用洗涤剂来缓解这些过程的明显想法缺乏控制：任何常规表面改性剂的作用都是直接和全面的。使用含光敏偶氮苯的表面活性剂，我们克服了这些限制。这种光皂含有光开关（偶氮苯分子），其在用适当波长的光照射时经历可逆的反-顺光异构化，导致随后的物理化学分子性质的变化。在这项工作中，我们表明，当反式和顺式异构体组成的空间梯度在固液界面附近产生时，可以启动大量的流体动力学流动，其空间范围可以设定，例如，通过激光点的形状。我们提出了光诱导扩散渗透驱动流动的概念，它可以在固液界面处去除、聚集或图案化颗粒组装体。换句话说，除了提供肥皂之外，我们还实现了选择性：粒子在照明时被动员和移动，并且仅穿过照明区域。
The strong adhesion of sub-micron sized particles to surfaces is a nuisance, both for removing contaminating colloids from surfaces and for conscious manipulation of particles to create and test novel micro/nano-scale assemblies. The obvious idea of using detergents to ease these processes suffers from a lack of control: the action of any conventional surface-modifying agent is immediate and global. With photosensitive azobenzene containing surfactants we overcome these limitations. Such photo-soaps contain optical switches (azobenzene molecules), which upon illumination with light of appropriate wavelength undergo reversible trans-cis photo-isomerization resulting in a subsequent change of the physico-chemical molecular properties. In this work we show that when a spatial gradient in the composition of trans- and cis- isomers is created near a solid-liquid interface, a substantial hydrodynamic flow can be initiated, the spatial extent of which can be set, e.g., by the shape of a laser spot. We propose the concept of light induced diffusioosmosis driving the flow, which can remove, gather or pattern a particle assembly at a solid-liquid interface. In other words, in addition to providing a soap we implement selectivity: particles are mobilized and moved at the time of illumination, and only across the illuminated area.
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影响因子：
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作者：
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通讯作者：
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作者：
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通讯作者：
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