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Microcosmic Mechanism Research on Superhydrophobic Materials of Bionic Water Strider Robot

Author: DingYueSheng
Tutor: ZuoJiHong
School: Harbin Institute of Technology
Course: Mechanical and Electronic Engineering
Keywords: bionic water strider robot molecular dynamics superhydrophobic microcosmic mechanism
CLC: TP242
Type: Master's thesis
Year: 2013
Downloads: 8
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Abstract


Bionic water strider robot is a kind of micro water-walking robot developed bysimulating strider’s flexible movement on water surface. The robot has been appliedfor assisting human beings with certain work. The research of bionic water striderrobot is an advanced multi-interdisciplinary subject referring to bionics,Micro-Electro-Mechanism System, surface chemistry, atomic physics andnanormaterials. And the advancements of bionic water strider robot’s properties relyon the mutual improvement of all disciplines. Presently, bionic water strider robothas several shortcomings, such as weak super-hydrophobicity, bad stability, inferiorflexibility and insufficient microminiaturization. Not imitating thesuper-hydrophobicity of strider leg in principle is the substantial reason for theseweaknesses. Therefore, this paper aims at the realization of bionics in principle.Based on the molecular dynamics method, the mechanism of super-hydrophobicmaterials is analyzed in microcosm, according the conclusion of which andcombining the micro structure of strider leg, the microcosmic mechanism isacknowledged. And eventually the bionic water strider robot is realized in principle.The detailed research is divided into three aspects:Firstly, the special structure of the biological water strider legs and analyze itsmicroscopic effects are observed. Detailed analysis of Microscopic mechanism ofsuperhydrophobic materials of biomimetic water strider robot’s supporting leg ismade and research methods on Microscopic mechanism of biomimetic water striderrobot are identified. Microscopic model of superhydrophobic materials are buildbased on microscopic composition analysis of the materials and molecular dynamicstheory and simulation conditions are established according to the model.Then, the method of the micro mechanism analysis of super-hydrophobicmaterial in static state is designed and molecular dynamic simulation of equilibriumstate is performed. Geometric method is utilized to determine the microscopiccontact angle, and combined with Cassie’s relation, the equation of microscopiccontact angle and apparent contact angle is developed. The transformation law of thematerial’s wetting property is studied by changing the molecular organization andarrangement. The material is made by the method self-assemble monolayer andexperiment results testifies the analysis about the transformation rules ofsuper-hydrophobic property, which provides the fundamental basis for the bionicdevelopment of super-hydrophobic materials.Finally, based on the course of the water jump and glide in which biologicalwater can move both vertically and horizontally relative to water. Analysis methods on dynamic microscopic mechanism of superhydrophobic material in the verticaland horizontal direction are designed. Droplets impact veneer model is buildvertically, and dual plate extrusion reverse motion model is build horizontally andthe effect of droplets and material’s relative speed and microscopic composition ofmaterial on dynamic Simulation is studied respectively. The infiltration state,Microscopic force, drop centroid position and contact angle hysteresis are analyzedin the dynamic Simulation in depth, and find microscopic explanati on of thesephenomena.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Robotics > Robot
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