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Fabrication of Novel Superhydrophobic Surfaces and Droplet Bouncing Behavior - Part 2: Water Droplet Impact Experiment on Superhydrophobic Surfaces Constructed Using ZnO Nanoparticles
Wang BB(王斌斌); Zhao YP(赵亚溥); Yu TX(余同希); Zhao, YP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
Source PublicationJournal of Adhesion Science and Technology
2011
Volume25Issue:1-3Pages:93-108
ISSN0169-4243
AbstractWhen a liquid droplet impacts a solid surface, it spreads up to a point and the kinetic energy is dissipated by viscosity, collision and surface energy during the process. The droplet can retract if the energy dissipation during the impact process which is only partly governed by surface properties is not too large. Otherwise, the droplet would stick to the surface or break into smaller droplets. In this second part, we introduced contact angle hysteresis (CAH) and studied the impact behavior between a water droplet and a superhydrophobic surface both theoretically and experimentally. On our superhydrophobic surface, the contact angle is about 155 degrees, so the kinetic energy of the droplet can be largely transferred to surface energy. Thus, under certain conditions, the droplet can fully bounce. The impact behavior of normal impact was analyzed theoretically. The critical falling heights for rebound (CFHR) were investigated on constructed ZnO-PDMS superhydrophobic surface in both normal and oblique impact conditions, and CFHR was found to increase with the increase of tilt angle. This shows that the normal Weber number (We(n)) is the major factor governing the rebound, while the tangential Weber number (We(t)) also has effect on the phenomenon. Compared to the energy dissipated by collision and viscosity, the influence of surface properties is relatively small. The adhesion number (N(a)) is the parameter determining the energy dissipated by surface tension and N(a) has direct relation with contact angle (CA) and CAH. (C) Koninklijke Brill NV, Leiden, 2011
KeywordSuperhydrophobic Surface Water Droplet Normal Impact Oblique Impact Contact Angle Hysteresis Adhesion Number Energy Dissipation
Subject AreaEngineering ; Materials Science ; Mechanics
DOI10.1163/016942410X501115
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000285642600005
WOS Research AreaEngineering ; Materials Science ; Mechanics
WOS SubjectEngineering, Chemical ; Materials Science, Multidisciplinary ; Mechanics
Funding OrganizationThis work was jointly supported by the National High-Tech R&D Program of China (863 Program, Grant No. 2007AA021803), National Basic Research Program of China (973 Program, Grant No. 2007CB310500), and National Natural Science Foundation of China (NSFC, Grant Nos 10772180 and 10721202).
DepartmentLNM纳/微系统力学与物理力学
ClassificationQ3
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/44958
Collection非线性力学国家重点实验室
Corresponding AuthorZhao, YP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Wang BB,Zhao YP,Yu TX,et al. Fabrication of Novel Superhydrophobic Surfaces and Droplet Bouncing Behavior - Part 2: Water Droplet Impact Experiment on Superhydrophobic Surfaces Constructed Using ZnO Nanoparticles[J]. Journal of Adhesion Science and Technology,2011,25(1-3):93-108.
APA 王斌斌,赵亚溥,余同希,&Zhao, YP .(2011).Fabrication of Novel Superhydrophobic Surfaces and Droplet Bouncing Behavior - Part 2: Water Droplet Impact Experiment on Superhydrophobic Surfaces Constructed Using ZnO Nanoparticles.Journal of Adhesion Science and Technology,25(1-3),93-108.
MLA 王斌斌,et al."Fabrication of Novel Superhydrophobic Surfaces and Droplet Bouncing Behavior - Part 2: Water Droplet Impact Experiment on Superhydrophobic Surfaces Constructed Using ZnO Nanoparticles".Journal of Adhesion Science and Technology 25.1-3(2011):93-108.
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