Water-ions induced nanostructuration of hydrophobic polymer surfaces.
Water-ions induced nanostructuration of hydrophobic polymer surfaces.
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DOI：
10.1021/nn103564e
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发表时间：
2011-03
期刊：
影响因子：
17.1
通讯作者：
I. Sîretanu;J. Chapel;C. Drummond
中科院分区：
文献类型：
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作者：
I. Sîretanu;J. Chapel;C. Drummond
当疏水表面在环境条件下与水接触时，在界面上存在一层密度降低的层，防止两相之间的密切接触。通过脱气水来减少这一层的范围可以对两相之间的相互作用产生显著的影响。疏水聚合物薄膜与水溶液之间的接近性增强，由于水离子（水合氢离子和羟基）在界面上的吸附，导致电-水动力学不稳定性的发展，从而在固体表面诱导自组装纳米结构。在室温下放置几周后，自组装结构会自发松弛回原来的扁平形态。这种不稳定性和自组装结构是由疏水表面电荷控制的，而疏水表面电荷是由水相的pH值和溶解气体的量决定的。这种效应可以很容易地在亚微米水平上调整以修饰不同的疏水性聚合物基质，从而在单个简单的水性步骤中打开在纳米尺度上产生受控图案的途径。
When hydrophobic surfaces are in contact with water in ambient conditions a layer of reduced density is present at the interface, preventing the intimate contact between the two phases. Reducing the extent of this layer by degassing the water can have remarkable implications for the interaction between the two phases. The enhanced proximity between a hydrophobic polymer film and an aqueous solution can induce a self-assembled nanostructure on the solid surface through the development of an electro-hydrodynamic instability, due to the adsorption of the water-ions (hydronium and hydroxyl) at the interface. The self-assembled structure spontaneously relaxes back to the original flat morphology after few weeks at room temperature. This instability and the self-assembled structure are controlled by the hydrophobic surface charge, which is determined by the pH of the aqueous phase, and by the amount of gas dissolved. This effect can be easily adjusted to modify different hydrophobic polymeric substrates at the submicrometer level, opening pathways for producing controlled patterns at the nanoscale in a single simple waterborne step.