气相法沉积聚四氟乙烯薄膜及其疏水性

发布时间：2018-05-05 20:16

本文选题：聚四氟乙烯薄膜 + 电子束蒸发法　；参考：《南京理工大学》2014年硕士论文

【摘要】：润湿是自然界和人类生活中的共同界面现象,是一种固体表面性质。近年来,疏水和超疏水材料由于其潜在的功能性应用而受到了国内外研究者的极大关注。目前,制备超疏水表面多采用湿法工艺,但由于聚四氟乙烯(PTFE)几乎不溶于所有试剂,并不适用于湿法工艺。本文采用低功率电子束蒸发法制备PTFE疏水薄膜,主要研究内容如下：采用低功率电子束法在陶瓷片基底上沉积PTFE薄膜,研究制备工艺、基底性质对PTFE薄膜形貌、润湿性能的影响。结果表明,所制备的薄膜表面均呈疏水性,硫酸浓度、刻蚀时间、沉积时间对薄膜的表面形貌、粗糙度、疏水性均产生显著影响；在陶瓷片和载玻片上沉积PTFE薄膜并计算基底表面能。发现基底表面粗糙度和表面能同时影响薄膜的表面润湿性,但表面能的作用比粗糙度更明显。通过改变制备条件,在经草酸刻蚀过的Cu片基底上成功制备出超疏水PTFE薄膜,且薄膜表面最大接触角达到153.34°,滚动角几乎为0°,具有优异的超疏水效果。通过分析,进一步说明低表面能物质的修饰是基底表面呈现超疏水性的主要原因以磁控溅射法制备的Cu膜为基底,分别经退火或H202溶液处理后制备Cu/PTFE复合膜,研究工艺条件对复合膜表面形貌、粗糙度及疏水性的影响。结果发现,H202处理过的Cu膜表面形成纳米棒结构,且粗糙度较大；在该基底上沉积PTFE薄膜,测得Cu/PTFE复合膜表面接触角最大达到155.17°,滚动角为2°,显示出优良的超疏水性。采用电子束蒸发法在Cu片上沉积聚乙烯(PE)/PTFE复合膜,研究过渡层PE的厚度对复合膜表面粘附性及疏水性的影响。结果表明,经草酸刻蚀过的Cu片上复合膜的疏水性比未刻蚀的好；同时,粘附力与接触角呈负相关,粘附力越小,其接触角越大,表面疏水性越好。说明一定厚度的PE过渡层能明显降低薄膜表面粘附力,增强疏水性。
[Abstract]:Wetting is a common interfacial phenomenon in nature and human life, and it is a solid surface property. In recent years, hydrophobic and superhydrophobic materials have attracted great attention from researchers at home and abroad for their potential functional applications. At present, superhydrophobic surfaces are prepared by wet process, but PTFEs are insoluble in almost all reagents, so they are not suitable for wet process. In this paper, PTFE hydrophobic thin films were prepared by low power electron beam evaporation. The main research contents are as follows: PTFE thin films were deposited on ceramic substrates by low power electron beam method. The effects of substrate properties on the morphology and wettability of PTFE thin films were studied. The results showed that the surface of the films were hydrophobic, and the concentration of sulfuric acid, etching time and deposition time had a significant effect on the surface morphology, roughness and hydrophobicity of the films. PTFE thin films were deposited on ceramic and glass slides and the surface energy of substrates was calculated. It is found that the surface wettability of the films is affected by both the surface roughness and the surface energy, but the effect of the surface energy is more obvious than the roughness. Superhydrophobic PTFE thin films were successfully prepared on Cu substrates etched by oxalic acid by changing the preparation conditions. The maximum contact angle and rolling angle of the films were 153.34 掳and 0 掳respectively, which showed excellent superhydrophobic effect. It is further proved that the modification of low surface energy substances is the main reason for the superhydrophobicity of the substrate surface. The surface morphology, roughness and hydrophobicity of Cu/PTFE composite films were investigated by annealing or H202 solution treatment on Cu films prepared by magnetron sputtering. The results show that nanorod structure is formed on the surface of Cu film treated with H202, and the surface roughness of PTFE film is large, and the surface contact angle of Cu/PTFE composite film is 155.17 掳and the rolling angle is 2 掳, which shows excellent superhydrophobicity. PEN / PTFE composite films were deposited on Cu substrates by electron beam evaporation. The effect of the thickness of the transition layer PE on the surface adhesion and hydrophobicity of the composite films was studied. The results show that the hydrophobicity of Cu composite film etched by oxalic acid is better than that of unetched Cu, and the adhesion force is negatively related to the contact angle, the smaller the adhesion force is, the greater the contact angle is, and the better the surface hydrophobicity is. The results show that a certain thickness of PE transition layer can obviously reduce the surface adhesion of the film and enhance the hydrophobicity.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB383.2

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