Laser textured surface gradients
Laser textured surface gradients
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DOI：
10.1016/j.apsusc.2016.03.054
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发表时间：
2016-05-15
影响因子：
6.7
通讯作者：
Shephard, Jonathan D.
中科院分区：
文献类型：
--
作者：
Van Duong Ta;Dunn, Andrew;Shephard, Jonathan D.
这项工作展示了一种新的技术，用于制造表面的粗糙度和润湿性梯度及其随后的化学传感器的应用。利用纳秒激光毛化技术直接获得了黄铜薄板的表面粗糙度梯度。当这些结构化表面暴露于空气中时，它们的润湿性随着时间（最多20天）而降低，从而实现空间和时间润湿性梯度。表面对有机溶剂有反应。一系列稀异丙醇溶液的接触角随浓度呈指数衰减。特别地，当异丙醇浓度从0增加到15.6wt%时，在表面梯度上观察到接触角下降132，比未处理表面观察到的14高一个数量级。随着润湿性在表面上逐渐改变，接触角也相应地改变。这种效应在表面上的不同区域提供多灵敏度，并且对于精确测量化学浓度是有用的。(C)2016年6月，作者。由爱思唯尔公司出版
This work demonstrates a novel technique for fabricating surfaces with roughness and wettability gradients and their subsequent applications for chemical sensors. Surface roughness gradients on brass sheets are obtained directly by nanosecond laser texturing. When these structured surfaces are exposed to air, their wettability decreases with time (up to 20 days) achieving both spatial and temporal wettability gradients. The surfaces are responsive to organic solvents. Contact angles of a series of dilute isopropanol solutions decay exponentially with concentration. In particular, a fall of 132 in contact angle is observed on a surface gradient, one order of magnitude higher than the 14 observed for the unprocessed surface, when the isopropanol concentration increased from 0 to 15.6 wt%. As the wettability changes gradually over the surface, contact angle also changes correspondingly. This effect offers multi-sensitivity at different zones on the surface and is useful for accurate measurement of chemical concentration. (C) 2016 The Authors. Published by Elsevier B.V.