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Preparation and Characterization of Composite Super-Hydrophobic Film on Copper Surface

Author: WangJingGang
Tutor: WangFang
School: Northwest University of Science and Technology
Course: Applied Chemistry
Keywords: Superhydrophobic Self-assembly Organosilane Contact angle
CLC: TB383.2
Type: Master's thesis
Year: 2011
Downloads: 58
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Abstract


In recent years, the super-hydrophobic surface to receive widespread attention because of its excellent self-cleaning ability, water-repellent ability and special friction performance. Copper is an important industrial raw materials, its value is extremely important in the field of wire microelectrode manufacturing and microelectronics, and other metals, the copper surface easily contaminated, corrosive. Organosilane film was prepared in the copper surface with super hydrophobic properties, not only can greatly enhance the self-cleaning capability, and corrosion inhibition ability of the copper, and almost does not affect the metallic luster of the copper. The purpose of this experiment is to search for a low-cost, simple operation method of the preparation of copper superhydrophobic surface. First of all, from the choice of substrate and self-assembled compounds selected factory rear surface roughness of 5.5μm-7.5μm copper foil as self-assembly base eliminates the need for grinding rough handling steps. Through the retrieval and analysis of the literature, we selected after hydrolysis containing-SH containing a single reactive group-OH two active groups (3 - mercaptopropyl) trimethoxysilane (MPTS) and hydrolysis corporation (-OH) n-octyl triethoxy silane (OS) as a self-assembled compound. MPTS toxic and malodorous, so should not be large-scale use, but it contains the-SH is proved and the noble metals such as Au, Ag, Cu, etc. to form a stable bond and Cu; OS can not be directly through the self-assembled to form a stable combination, but with the cheap, contain a long hydrophobic carbon chain advantage. Therefore, we in the copper surface through the layers of self-assembly method prepared the MPTS / OS composite super-hydrophobic film. This method has the advantages of lower cost compared with the conventional method of using fluorine-containing organic compounds prepared superhydrophobic surface. Second, we explore the film-forming method and process optimization, obtained a preparation of copper superhydrophobic surface route. MPTS formulated into the MPTS, deionized water and ethanol ratio of 1:5:94 (v / v / v) solution, hydrolysis 24h; OS formulated as OS, deionized water, ethanol ratio of 5:20 : 75 (v / v / v) of the solution, adjusting the pH to 4.0, hydrolysis 76h; the copper substrate ultrasonically cleaned in acetone 15min degreasing to HNO 3 (6.5 wt.%) etching 60s, water termination reaction, deionized water ultrasonic cleaning 5min. Etching after the base the MPTS hydrolysis solution self-assembly 24h, rinse with ethanol, air drying, and then self-assembled OS hydrolysis solution 20min, rinse with ethanol, air drying, 120 ℃ curing 10min repeat OS self-assembly process times. Hydrolysis and self-assembly process in a water bath at 35 ℃. Finally, by contact angle measurements, scanning electron microscopy, infrared spectroscopy, and seawater experiments superhydrophobic surface performance test. The results demonstrate that the self-assembled MPTS / OS static water contact angle of the surface of the substrate of the composite film reached 158.6 °, and the roll angle is 3 °; produced corrosion pits and the grooves after the etched surface of the substrate, and nano - micron strata composite roughness, the self-assembling silane film after the substrate surface covering the polymeric film layer of translucent silane; infrared spectrum shows the association of the surface of the substrate contains a large amount of hydroxyl group and a methylene group, and containing a Si-O-Si structure; the seawater tests proved separate assembly MPTS or OS can not enhanced corrosion of the copper surface, self-assembled the MPTS / OS composite film can be effectively enhanced corrosion of the copper surface. Innovative point of this paper: (1) select itself has a certain roughness of copper foil as the substrate, eliminating the need for steps basal polished rough handling; (2) Select a group containing two active MPTS as a linker The combination of relatively inexpensive organic silane (OS) in a not easily occur with copper was prepared in the copper surface of a composite film with super hydrophobic properties.

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