Engineering Functionality Gradients by Dip Coating Process in Acceleration Mode
Engineering Functionality Gradients by Dip Coating Process in Acceleration Mode
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DOI：
10.1021/am504770x
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发表时间：
2014-10-08
影响因子：
9.5
通讯作者：
Grosso, David
中科院分区：
文献类型：
--
作者：
Faustini, Marco;Ceratti, Davide R.;Grosso, David
在这项工作中，独特的功能器件，表现出受控的性能梯度的浸涂工艺在加速模式下制造。通过这种新方法，以一种简单和通用的方式制备具有亚毫米级“按需”厚度梯度分布的薄膜，与大规模生产兼容。该技术适用于几种相关材料，包括溶胶-凝胶致密和介孔金属氧化物，嵌段共聚物，金属有机框架胶体，和商业光刻胶。在文章的第一部分，浸涂速度的变化对厚度分布的影响的调查报告一起的蒸发速率和粘度上的流体排水诱导的膜的形成所起的关键作用。在第二部分中，浸涂在加速模式是用来诱导控制功能的变化，通过发挥在纳米和微米系统的结构，化学或尺寸变化。为了证明该技术的全部潜力和多功能性，原始的梯度功能器件，包括光学干涉镜与双向梯度，一维光子晶体与阻带梯度，梯度微流体通道，和润湿梯度诱导液滴运动。
In this work, unique functional devices exhibiting controlled gradients of properties are fabricated by dip-coating process in acceleration mode. Through this new approach, thin films with "on-demand" thickness graded profiles at the submillimeter scale are prepared in an easy and versatile way, compatible for large-scale production. The technique is adapted to several relevant materials, including sol-gel dense and mesoporous metal oxides, block copolymers, metal-organic framework colloids, and commercial photoresists. In the first part of the Article, an investigation on the effect of the dip coating speed variation on the thickness profiles is reported together with the critical roles played by the evaporation rate and by the viscosity on the fluid draining-induced film formation. In the second part, dip-coating in acceleration mode is used to induce controlled variation of functionalities by playing on structural, chemical, or dimensional variations in nano- and microsystems. In order to demonstrate the full potentiality and versatility of the technique, original graded functional devices are made including optical interferometry mirrors with bidirectional gradients, one-dimensional photonic crystals with a stop-band gradient, graded microfluidic channels, and wetting gradient to induce droplet motion.