A non-fluorinated mechanochemically robust volumetric superhydrophobic nanocomposite  

作　　者：E.Vazirinasab G.Momen R.Jafari 

机构地区：[1]Department of Applied Sciences,University of Quebec in Chicoutimi(UQAC),555,boul.de I'universite,Chicoutimi,Quebec,G7H 2B1,Canada

出　　处：《Journal of Materials Science & Technology》2021年第7期213-225,共13页材料科学技术（英文版）

基　　金：the Natural Sciences and Engineering Research Council of Canada (NSERC);K-Line Insulators Limited (Toronto, Canada) for financial support。

摘　　要：The widespread use of water-repellent superhydrophobic surfaces is limited by the inherent fragility of their micro-and nanoscale roughness, which is prone to damage and degradation. Here, we report a non-fluorinated volumetric superhydrophobic nanocomposites that demonstrate mechanochemical robustness. The nanocomposites are produced through the addition of microscale diatomaceous earth and nanoscale fumed silica particles to high-temperature vulcanized silicone rubber. The water-repellency of the surface and bulk of nanocomposites having 120 phr of filler was determined based on the water contact angle and contact angle hysteresis. We compared the water-repellency of nanocomposites of differing diatomaceous earth to fumed silica mass ratios. Increasing the amount of diatomaceous earth enhanced the water-repellency of the nanocomposite surface, whereas an increased amount of fumed silica improved the water-repellency of the bulk material. Moreover, increasing the diatomaceous earth/fumed silica mass ratio improved the cross-linking density and hardness values of the nanocomposite.Despite being subjected to a range of mechanical durability tests, including sandpaper abrasion,knife scratching, tape peeling, water jet impact, and sandblasting, the nanocomposite maintained a water contact angle of 163. and contact angle hysteresis of 2°. When the water-repellency of the prepared nanocomposites eventually deteriorated, we restored their superhydrophobicity by removing the upper surface of the nanocomposite. This extraordinary robustness stems from the embedded low surface energy micro/nanostructures distributed throughout the nanocomposite. We also demonstrated the chemical stability, UV resistance, and self-cleaning abilities of the nanocomposite to illustrate the potential for real-life applications of this material.

关 键 词：Volumetric superhydrophobic NANOCOMPOSITE Diatomaceous earth Hierarchical micro/nanostructure Mechanical robustness Chemical stability SELF-CLEANING 

分 类 号：TB332[一般工业技术—材料科学与工程]