仿生超疏水棉织物的制备与表面分析

以荷叶表面微/纳米结构为参考模型,先用硅溶胶处理天然棉织物,再用N-β-氨乙基-γ-氨丙基聚二甲基硅氧烷(ASO-1)对其进行修饰,获得了微/纳米二元粗糙的超疏水织物,水滴在该织物表面接触角可达160.5°。场发射扫描电子显微镜(FE-SEM)观察发现超疏水纤维表面存在大量均匀分布的纳米微凸体。接触角分析表明织物织造过程中形成的微米级粗糙度和ASO-1膜的存在是织物疏水的主要原因,纳米微凸体能减少纤维与水的接触面积,提高水在纤维表面的接触角,使织物由疏水转变为超疏水。最后用X射线光电子能谱仪(XPS)证实了纤维表面SiO2粒子和ASO-1膜的存在。

Biomimetic Superhydrophobic Cotton Textiles:Fabricated and Surface Analysis

Inspired from the micro/nanoscaled structure of the lotus leaf,we fabricated a superhydrophobic cotton textile with micro/nanoscaled dual-sized roughness surface using silica gol and N-β-aminoethyl-γ-aminopropyl polysiloxane(ASO-1). The contact angle of the modified textile can reach to 160.5°. Field emission scanning electronic microscope (FESEM) photography showed there are many nano-particles on the treated cotton fabric surface. The contact angle analysis indicated the micro-scale roughness of the textile itself and the hydrophobic films of ASO-1 are the reasons why cotton fabric changed from hydrophilicity to hydrophobicity. Nano-particles formed by silica sol can decrease the contact area between water and textile surface,increasing the contact angle and water-repellent ability. As a result the superhydrophobic textile was fabricated. Finally,the chemical composition of the superhydrophobic cotton textile surface was confirmed by X-ray photoelectron spectroscopy (XPS).