Superhydrophobic properties of silver-coated films on copper surface by galvanic exchange reaction

Abstract

Hydrophobic properties of thin nanostructured silver films produced by galvanic exchange reaction on a copper surface were studied after passivation with stearic acid.The morphology of the silver films was controlled by varying the concentration of silver nitrate in the solution. Water contact angle as high as 156° and contact angle hysteresis as low as 5° were achieved for samples obtained with initial silver ion concentration of 24.75 mM in the solution. However, a strong dependence of contact angle and contact angle hysteresis on the fractal-like morphology of the silver films was observed with the variation of silver ion concentration.

Nano-micro structured superhydrophobic zinc coating on steel for prevention of corrosion and ice adhesion

“…Zhao et al [39] and Safaee et al [40] show that organic acid passivated silver surfaces on ITO and copper substrates, respectively, show superhydrophobic properties and can reach a maximum by controlling the deposition time as we have shown in the zinc coated steel substrates case.…”

One-Step Deposition Process to Obtain Nanostructured Superhydrophobic Thin Films by Galvanic Exchange Reactions

“…Silver films have been previously rendered superhydrophobic via a two-step approach by electroless deposition [28]. Very recently, we have demonstrated superhydrophobicity on silver thin films deposited on copper surfaces by galvanic exchange reactions followed by passivation with stearic acid (SA) [19]. However, a superhydrophobic coating consisting of only a single layer of an organic molecule such as SA is not very stable even against the frictional force caused by water flow and, therefore, may not be suitable for a prolonged application.…”

“…In the last two years we have fabricated several superhydrophobic surfaces using diverse methods which demonstrated water roll-off properties [7,16,[19][20][21][22][23][24]. All the above-mentioned studies involve two-step processes where in the first step a rough surface is created and in the second step, the rough surface is 'passivated' by coating with low surface energy molecules or thin films.…”

Controlled anisotropic wetting behaviour of multi-scale slippery surface structure of non fluoro polymer composite

“…[6][7][8][9][10][11]. Slippery surfaces are generally obtained by a combination of low surface energy materials and hierarchal structures, with trapped air pockets on which water droplets forms a liquid ball [12][13][14][15][16][17]. Earlier investigations on the surface texture of hydrophobicity were reported in terms of Wenzel and Cassie-Baxter model considering the water wettability of solid surface.…”