Sasmal Anup Kumar, Mondal Chanchal, Sinha Arun Kumar, Gauri Samiran Sona, Pal Jaya, Aditya Teresa, Ganguly Mainak, Dey Satyahari, Pal Tarasankar
Department of Chemistry and ‡Department of Biotechnology, Indian Institute of Technology , Kharagpur-721302, India.
ACS Appl Mater Interfaces. 2014 Dec 24;6(24):22034-43. doi: 10.1021/am5072892. Epub 2014 Dec 5.
Superhydrophobic surfaces prevent percolation of water droplets and thus render roll-off, self-cleaning, corrosion protection, etc., which find day-to-day and industrial applications. In this work, we developed a facile, cost-effective, and free-standing method for direct fabrication of copper nanoparticles to engender superhydrophobicity for various flat and irregular surfaces such as glass, transparency sheet (plastic), cotton wool, textile, and silicon substrates. The fabrication of as-prepared superhydrophobic surfaces was accomplished using a simple chemical reduction of copper acetate by hydrazine hydrate at room temperature. The surface morphological studies demonstrate that the as-prepared surfaces are rough and display superhydrophobic character on wetting due to generation of air pockets (The Cassie-Baxter state). Because of the low adhesion of water droplets on the as-prepared surfaces, the surfaces exhibited not only high water contact angle (164 ± 2°, 5 μL droplets) but also superb roll-off and self-cleaning properties. Superhydrophobic copper nanoparticle coated glass surface uniquely withstands water (10 min), mild alkali (5 min in saturated aqueous NaHCO3 of pH ≈ 9), acids (10 s in dilute HNO3, H2SO4 of pH ≈ 5) and thiol (10 s in neat 1-octanethiol) at room temperature (25-35 °C). Again as-prepared surface (cotton wool) was also found to be very effective for water-kerosene separation due to its superhydrophobic and oleophilic character. Additionally, the superhydrophobic copper nanoparticle (deposited on glass surface) was found to exhibit antibacterial activity against both Gram-negative and Gram-positive bacteria.
超疏水表面可防止水滴渗透，从而实现滚落、自清洁、防腐蚀等功能，这些功能在日常和工业应用中都有体现。在本工作中，我们开发了一种简便、经济高效且独立的方法，用于直接制备铜纳米颗粒，以赋予各种平面和不规则表面（如玻璃、透明片材（塑料）、棉绒、纺织品和硅基板）超疏水性。通过在室温下用肼水合物对醋酸铜进行简单的化学还原，完成了所制备超疏水表面的制造。表面形态学研究表明，所制备的表面粗糙，由于气穴的产生（卡西 - 巴克斯特状态），在润湿时表现出超疏水特性。由于水滴在制备好的表面上附着力低，这些表面不仅具有高水接触角（164±2°，5μL液滴），还具有出色的滚落和自清洁性能。超疏水铜纳米颗粒涂层玻璃表面在室温（25 - 35°C）下能独特地耐受水（10分钟）、弱碱（在pH≈9的饱和碳酸氢钠水溶液中5分钟）、酸（在pH≈5的稀硝酸、硫酸中10秒）和硫醇（在纯1 - 辛烷硫醇中10秒）。同样，所制备的表面（棉绒）因其超疏水和亲油特性，也被发现对水 - 煤油分离非常有效。此外，发现超疏水铜纳米颗粒（沉积在玻璃表面）对革兰氏阴性菌和革兰氏阳性菌均表现出抗菌活性。
