Simulation Study on Chemical Etching of Superhydrophobic Materials by Molecular Dynamics
A technology for preparing superhydrophobic surfaces was introduced.The technology first uses sulfuric acid to etch the surface of aluminum substrate,and then uses stearic acid for low surface energy treatment,forming a double-layer air cushion structure to make the aluminum substrate surface superhydrophobic and corrosion-resistant.Experimental results show that this method can prepare a superhydrophobic surface with a contact angle of up to 151.2±1.5° and a rolling angle as low as 4.0±0.8°.Molecular dynamics simulations indicate that stearic acid molecules face the water droplets with their hydrophobic ends,and the hydrophilic ends face the sample,forming a monolayer film that prevents water molecules from diffusing.Impedance and polarization test results show that the superhydrophobic surface can prevent the diffusion behavior of corrosive anions on the substrate surface and improve the corrosion resistance of the metal.In summary,this low-cost,simple and fast preparation method has practicality and is expected to have wide applications in the field of materials science and engineering.
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