Fabrication of Superhydrophobic Cellulose-Based Materials through a Solution-Immersion Process
writer：Shenghai Li, Suobo Zhang*, and Xianhong Wang
keywords：Superhydrophobic, Cellulose, Solution-Immersion Process
source：期刊
specific source：Langmuir
Issue time：2008年
An industrial waterproof reagent [(potassium methyl siliconate) (PMS)] was used for fabricating a superhydrophobic surface on a cellulose-based material (cotton fabric or paper) through a solution-immersion method. This method involves a hydrogen bond assembly and a polycondensation process. The silanol, which was formed by a reaction
of PMS aqueous solution with CO2, was assembled on the cellulose molecule surface via hydrogen bond interactions. The polymethylsilsesquioxane coatings were prepared by a polycondensation reaction of the hydroxyl between cellulose and silanol. The superhydrophobic cellulose materials were characterized by FTIR spectroscopy, thermogravimetry, and surface analysis (XPS, FESEM, AFM, and contact angle measurements). Analytical characterization revealed that nanoscale roughness protuberances uniformly covered the surface, thus transforming the cellulose from superhydrophilic to superhydrophobic with a water contact angle of 157°. The superhydrophobic coatings were satisfactory with regard to both chemical and mechanical durability, and because of the transparency of the coatings the native cotton fabric
displayed no changes with regard to either morphology or color. The easy availability of the materials and simplicity of this method render it convenient for mass production.