PDMS基透明超疏水表面的构筑及性能研究

发布时间：2018-04-26 05:13

  本文选题：涂层 + 透明　； 参考：《陕西科技大学》2017年硕士论文

【摘要】：高透明性是光学器件(如:智能窗户、太阳能电池板、相机镜头等)正常工作的必要条件。然而这些器件长期暴露于户外环境中,不免粘附各种污染物导致其性能下降,因此需要定期进行清洁处理。众所周知,荷叶表面的超疏水性能赋予其“出淤泥而不染”的自清洁功能。如果将这种原理应用到光学器件上,不仅可以长期保持物体表面的清洁,维持其特定功能性,还能减少人工清洗的繁琐劳动以及洗涤剂的使用,可以说既环保又省力。基于此,透明超疏水表面的构筑及性能研究成为了近年来学术界的热点课题。聚二甲基硅氧烷(PDMS)是一种具有良好化学稳定性、耐候性和优异透明性的疏水有机硅材料,被广泛应用于超疏水表面的制备。本课题采用PDMS为二氧化硅前驱体材料,以十八胺改性碳纳米管(MWCNTs-ODA)为模板在玻璃表面构筑具有一定微观粗糙度的透明硅纳米管(SNT)涂层,再通过化学气相沉积(CVD)固化PDMS对涂层进行疏水化处理,最终制备出具有高透明性的超疏水涂层。通过对涂层的透明性和润湿性能进行表征,发现随着喷涂液中PDMS浓度的提高,所得SNT涂层的透明度降低;去除模板过程中煅烧温度的升高和煅烧时间的延长导致SNT涂层的透明度先升高后不变。随着疏水化处理过程中固化PDMS沉积用量的增加和沉积时间的延长,水滴在所得涂层表面的接触角(CA)增大,滚动角(SA)减小,涂层的透明性逐渐降低。研究结果表明,所得最优涂层具有良好的透明性和优异的超疏水性,涂层在可见光(400~780 nm)范围内平均透光率高达83%以上,水滴在其表面接触角大于165°,滚动角小于3°。涂层经过480℃高温煅烧、500 mL水滴冲击、4 h超声处理、48 h强酸或强碱浸渍后,依然保持超疏水性和高透明性。将所得涂层应用于太阳能电池板的保护层,可以在维持太阳能电池正常发电的同时赋予其自清洁性能,具有广阔的应用前景。
[Abstract]:High transparency is a necessary condition for the normal operation of optical devices (such as smart windows, solar panels, camera lenses, etc.). However, these devices are exposed to outdoor environment for a long time. As we all know, the super hydrophobicity of lotus leaf surface can give it self-cleaning function. If this principle is applied to optical devices, it can not only keep the surface clean for a long time and maintain its specific function, but also reduce the tedious labor of manual cleaning and the use of detergents, which can be said to be both environmentally friendly and labor-saving. Based on this, the construction and performance of transparent superhydrophobic surfaces have become a hot topic in academic circles in recent years. Poly (dimethylsiloxane) (PDMS) is a hydrophobic silicone material with good chemical stability, weather resistance and transparency, which is widely used in the preparation of superhydrophobic surfaces. In this paper, PDMS was used as the precursor of silica and octadecylamine modified carbon nanotube (MWCNTs-ODA) as template to fabricate transparent silicon nanotubes (SNTs) coatings with certain micro roughness on glass surface. The superhydrophobic coating with high transparency was prepared by hydrophobic treatment by chemical vapor deposition (CVD) solidified PDMS. The transparency and wettability of the coating were characterized. It was found that the transparency of the SNT coating decreased with the increase of the concentration of PDMS in the spray solution. The increase of the calcination temperature and the prolongation of the calcination time during the removal of the template lead to the increase of the transparency of the SNT coating first and then unchanged. With the increase of the amount of solidified PDMS deposition and the prolongation of deposition time during hydrophobic treatment, the contact angle (CA) of water droplets on the coating surface increases, the rolling angle SA) decreases, and the transparency of the coating decreases gradually. The results show that the optimum coating has good transparency and super hydrophobicity. The average transmittance of the coating is over 83% in the range of visible light (400 ~ 780nm), the contact angle of water droplets on its surface is more than 165 掳, and the rolling angle is less than 3 掳. The coating was impregnated with strong acid or alkali for 48 h after 500 mL of water droplet was calcined at 480 鈩，

本文编号：1804631