Direct Assembly of Silica Nanospheres on Halloysite Nanotubes for “Green” Ultrahydrophobic Cotton Fabrics,Advanced Sustainable Systems

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Direct Assembly of Silica Nanospheres on Halloysite Nanotubes for “Green” Ultrahydrophobic Cotton Fabrics
Advanced Sustainable Systems ( IF 6.5 ) Pub Date : 2019-06-05 , DOI: 10.1002/adsu.201900009
Namrata V. Patil ₁ , Anil N. Netravali ₁

Affiliation

This paper presents a sustainable biomimetic approach to create ultrahydrophobic cotton fabrics. Cotton fabrics are modified using biobased raw materials to create multiple scale roughness and low surface energy on their surfaces. Naturally occurring halloysite nanotubes (HNT) are modified by silanization and direct assembly of silica (SiO₂) nanospheres on the surface of HNTs. HNTs “decorated” with SiO₂ nanospheres are covalently bonded onto the surface of cotton fabrics, creating a durable multiple scale surface roughness. Surface modified cotton fabrics are further grafted with fatty acid without using any solvent, via esterification. The combination of the hierarchical roughness pattern created on the surface through modified HNT, and fatty acid treatment results in ultrahydrophobic fabrics with water contact angles (WCAs) above 150°. Surface topographies of modified HNT particles and chemical changes are fully characterized. Attenuated total reflectance Fourier‐transform infrared and WCA studies are used to confirm the grafting of modified HNT particles and aliphatic fatty chains on surface of fabrics. The ultrahydrophobic cotton fabrics washed for five standard laundry cycles (25 home washings) show that the ultrahydrophobicity is durable. Moreover, the ultrahydrophobic fabrics are oleophilic, making them suitable for use in oil–water separation, anti‐biofouling and packaging, and other applications apart from water repellent clothing.

中文翻译：

在埃洛石纳米管上直接组装二氧化硅纳米球，用于“绿色”超疏水棉织物

本文提出了一种可持续的仿生方法来制造超疏水棉织物。棉织物使用生物基原料进行了改性，以在其表面上产生多尺度的粗糙度和低表面能。天然存在的埃洛石纳米管（HNT）通过硅烷化和HNT表面上的二氧化硅（SiO ₂）纳米球的直接组装而被改性。用SiO ₂ “装饰” HNT纳米球共价键合到棉织物的表面上，从而形成耐久的多尺度表面粗糙度。在不使用任何溶剂的情况下，通过酯化将表面改性的棉织物进一步接枝脂肪酸。通过改性的HNT在表面上产生的分层粗糙度图案和脂肪酸处理的结合，导致超疏水性织物的水接触角（WCA）大于150°。改性HNT颗粒的表面形貌和化学变化已得到充分表征。衰减的全反射傅立叶变换红外和WCA研究用于确认改性HNT颗粒和脂肪族脂肪链在织物表面的接枝。超疏水性棉织物经过五个标准的洗涤周期（25次家庭洗涤）后显示出超疏水性是持久的。

更新日期：2019-09-09

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