Spontaneous formation of linearly arranged microcraters on sol−gel-derived silica−poly(vinylpyrrolidone) hybrid films induced by Bénard−Marangoni convection
Spontaneous formation of linearly arranged microcraters on sol−gel-derived silica−poly(vinylpyrrolidone) hybrid films induced by Bénard−Marangoni convection
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Bénard-Marangoni 对流诱导溶胶凝胶衍生的二氧化硅-聚（乙烯基吡咯烷酮）杂化膜上自发形成线性排列的微坑
DOI：
10.1021/la3020332
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发表时间：
2012
期刊：
影响因子：
3.9
通讯作者：
Hiromitsu Kozuka
中科院分区：
文献类型：
--
作者：
Hiroaki Uchiyama;Yuto Mantani;Hiromitsu Kozuka
当溶剂从含有滴在固体基底上的非挥发性溶质的溶液中蒸发时，可以获得微米和纳米尺度上的复杂、精密的表面图案。这种蒸发驱动的图案形成已被用作薄膜中高度有序图案的制造工艺。在这里，我们提出了自发图案形成诱导的Be 'nard-Marangoni对流引发溶剂蒸发作为一种新的图案化过程的溶胶-凝胶衍生的有机-无机杂化膜。采用控温浸涂法制备的SiO2-聚乙烯吡咯烷酮杂化膜表面自发形成了高度为1.0-1.5 μm、宽度为100-200 μm的微坑，其表面图案平行于衬底提拉方向呈直线排列。这种高度有序的微图案是通过在高温下激活的Be 'nard-Marangoni对流和浸涂过程中涂层溶液在基材上的单向流动实现的。
Complex, sophisticated surface patterns on micrometer and nanometer scales are obtained when solvent evaporates from solutions containing nonvolatile solutes dropped on a solid substrate. Such evaporation-driven pattern formation has been utilized as a fabrication process of highly ordered patterns in thin films. Here, we suggested the spontaneous pattern formation induced by Bénard–Marangoni convection triggered by solvent evaporation as a novel patterning process of sol–gel-derived organic–inorganic hybrid films. Microcraters of 1.0–1.5 μm in height and of 100–200 μm in width were spontaneously formed on the surface of silica–poly(vinylpyrrolidone) hybrid films prepared via temperature-controlled dip-coating process, where the surface patterns were linearly arranged parallel to the substrate withdrawal direction. Such highly ordered micropatterns were achieved by Bénard–Marangoni convection activated at high temperatures and the unidirectional flow of the coating solution on the substrate during dip-coating.