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Robust Superhydrophobic Brass Mesh with Electrodeposited Hydroxyapatite Coating for Versatile Applications
Authors:Yu-Ping Zhang  Shi-Ming Zhang  Peng-Fei Liu  De-Liang Chen  Yuan Chen  Meng-Jun Chen  Chang-Hua Zhao
Affiliation:1.College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Changde 415000, China;2.Henan Institute of Science and Technology, Xinxiang 453000, China;3.Changde Zhengyang Biotechnology Co., Ltd., Changde 415000, China;4.College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
Abstract:A robust superhydrophobic brass mesh was fabricated based on a low-energy surface and a roughness on the nano/micro-meter scale. It was carried out by the forming of hydroxyapatite (HP) coatings on its surface through a constant current electro-deposition process, followed by immersion in fluoroalkylsilane solution. Surface morphology, composition and wetting behavior were investigated by field-emission scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high speed camera, and contact angle goniometer. Under optimal conditions, the resulting brass mesh exhibited superhydrophobicity, excellent anti-corrosion (η = 91.2%), and anti-scaling properties. While the surfactant liquid droplets of tetradecyl trimethyl ammonium bromide (TTAB) with different concentration were dropped on the superhydrophobic surface, maximum droplet rebounding heights and different contact angles (CAs) were observed and measured from side-view imaging. The plots of surfactant-concentration−maximum bounding height/CA were constructed to determine its critical-micelle-concentration (CMC) value. Close CMC results of 1.91 and 2.32 mM based on the determination of maximum rebounding height and CAs were obtained. Compared with its theoretical value of 2.1 mM, the relative errors are 9% and 10%, respectively. This indicated that the novel application based on the maximum rebounding height could be an alternative approach for the CMC determination of other surfactants.
Keywords:hydroxyapatite   superhydrophobic surface   anti-corrosion   critical-micelle-concentration
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