Authors: Yao Fang Jiale Yong Feng Chen Jinglan Huo Qing Yang Hao Bian Guangqing Du Xun Hou
Publish Date: 2016/08/17
Volume: 122, Issue: 9, Pages: 827-
Abstract
Tunable adhesive superhydrophobic materials have attracted increasing research interest due to their applications in microdroplet manipulation biological detection and microfluidic system However most of the artificial materials easily lose superhydrophobicity in harsh environments The durability of superhydrophobic materials is very important to extend their lifetime in practical applications In this paper bioinspired durable superhydrophobicity with tunable adhesion on polytetrafluoroethylene surfaces is realized via a onestep femtosecond laser irradiation On the laserinduced superhydrophobic surfaces the sliding angle can be tuned from 1° to 90° water droplet is pinned on the surface at any titled angles The tunable water adhesion results from different contact states which change from the lotus state to the transition state and then to the composite state with increasing average distance of irradiation points Water droplet quick localization and noloss droplet transportation were achieved through designing surface adhesion In addition the resultant surfaces are so stable that they can maintain superhydrophobicity even after storing in harsh environments without dramatical superhydrophobicity decay for a long timeThis work was supported by the National Science Foundation of China under the Grant Nos 61275008 51335008 and 61475124 the SpecialFunded Program on National Key Scientific Instruments and Equipment Development of China under the Grant No 2012YQ12004706 the Collaborative Innovation Center of Suzhou Nano Science and Technology and the International Joint Research Center for Micro/Nano Manufacturing and Measurement Technologies The SEM work was done at International Center for Dielectric Research ICDR Xi’an Jiaotong University we really appreciate Dai Yanzhu’s help for obtaining SEM images
Keywords: