| JIN Wei-feng,LI Xin,LI Jian,ZHANG Jia-yu,ZHENG Hao.Effect of Experimental Parameters on Cassie-Wenzel State Transition Information in Force Response Curve[J],52(12):169-177 |
| Effect of Experimental Parameters on Cassie-Wenzel State Transition Information in Force Response Curve |
| Received:September 30, 2023 Revised:November 27, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.12.015 |
| KeyWord:superhydrophobic surface state transition Cassie state Wenzel State force response curve method experimental parameters |
| Author | Institution |
| JIN Wei-feng |
School of Mechanical Engineering,Jiangsu Zhenjiang , China |
| LI Xin |
School of Mechanical Engineering,Jiangsu Zhenjiang , China |
| LI Jian |
School of Materials Science and Engineering, Jiangsu University, Jiangsu Zhenjiang , China |
| ZHANG Jia-yu |
School of Mechanical Engineering,Jiangsu Zhenjiang , China |
| ZHENG Hao |
School of Mechanical Engineering,Jiangsu Zhenjiang , China |
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| Abstract: |
| Cassie-Wenzel wetting state transition is a typical phenomenon in the failure of superhydrophobic surfaces and has attracted much more attention recently. The force response curve method, which is carried out by squeezing a liquid droplet on the tested superhydrophobic surfaces, is a typical method to characterize the Cassie-Wenzel wetting state transition. In this force response curve method, extracting the wetting state transition information from the force response curve is critical, which requires choosing suitable value of experimental parameters. In order to find out the suitable experimental parameter range for obtaining stable transition information of wetting state, the work aims to investigate the effect of experimental system error, experimental process parameters, surface wettability and wettability transition conditions on the wettability transition information in the force response curve. According to the theory of the force response curve method, a series of force response curves with the Cassie-Wenzel wetting state transition information were calculated for the squeezing droplet processes with different experimental parameters. The calculated results were verified by comparison with the force response curve from the former experiments. When the volume of droplet was 0.1 mL in the squeezing droplet experiment, a distance error of 1 μm and a force error of 0.8 mN could ensure the obvious wetting state transition information in the force response curve. More errors in both the distance and the force would make a considerable fluctuation on the force response curve, which might cover up the wetting state transition information. In the general situation of testing systems with a less precision, a droplet with volume above 0.050 mL could be used in the experiments to obtain the wetting state transition information. A volume above 0.010 mL could be used in experiments on testing system with a higher precision. The optimum value range of loading step was 10~25 μm, which could guarantee a reasonable wetting state transition information over the fluctuation on the force response curve. The above calculated results were verified by comparison between the former experiments from two different groups. Moreover, it was observed that both the wettability of the loading surface and the wettability of the surface to be measured in Cassie state had few effect on the wetting state transition information on the force curve. However, increasing the contact angle of the surface to be measured in Wenzel state might decrease the width of the bulge that represented the wetting state transition information. The wetting state transition information on the force response curve can be enhanced by using a smaller distance error and a force error, a large droplet size and a variable loading step length. Another wetting state transition information, a much more deflection on the force response curve induced by the droplet filling into the microstructure of the tested superhydrophobic surface during the wetting state transition process, can be used in the squeezing droplet experiment. By optimizing the experimental parameters based on the guidance in this work, the mechanism of the Cassie-Wenzel wetting state transition may be further reliably explored. |
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