Preparation and study of stable fluorine‐free superhydrophobicity of cotton fibers

Abstract

This paper proposes a method of directly modifying the surface of cotton fiber to achieve super‐hydrophobic properties. The process was directly utilized the long‐chain alkyl siloxane and the nano‐SiO2 modified cotton cloth, which was simple to operate, low in cost and environmentally friendly. This study discussed the influence of solvent ratio, reactant content and ammonia content on hydrophobicity. The solvent ratio had the greatest influence, and the maximum water contact angle (CA) changes were70° ± 1°. The maximum water CA of the superhydrophobic cotton fabric prepared after process selection was 162 ± 1.5°; it had good acid, alkali and salt resistance. After 24 h in a solution with a pH of 1–14, CA remained almost unchanged; After 144 h in a 3.5% salt solution, CA stabilized above 132°; it had self‐cleaning properties; it had good selective adsorption performance, which can quickly separate oil and water; it had good mechanical stability. After 300 times abrasion of sandpaper, which still shows hydrophobic properties.

Superhydrophilic and Underwater Superoleophobic Cotton Fabric for Oil–Water Separation and Removal of Heavy-Metal Ion

“…The DTG curves (differential form of TGA) are shown in Figure D. The weight loss peak of CF (Figure D­(a)) at 346 °C can be attributed to the decomposition of the cellulose chain of the cotton fabric. ,, The weight loss peak of CF-PDA (Figure D­(b)) appeared at 325 and 442 °C, respectively. Besides, the weight loss was lower than that of CF.…”

Robust superhydrophobic fabrics by infusing structured polydimethylsiloxane films

“…It was found that the textured and hydrophobic nature of the waxes found on lotus leaves are what made it superhydrophobic 2 . Since the illumination of the self‐cleaning effect of the lotus leaf, various endeavors have been undertaken to fabricate superhydrophobic surfaces with practical application in mind, such as self‐cleaning surfaces, 3–7 water repellent textiles, 8–14 and membranes/interfaces for oil/water separation 15–19 …”

“…Besides, the deposition of a colloidal dispersion of hydrophobic nanoparticles or mixtures of nanoparticles with hydrophobic molecules is a convenient method where fabrics of all types, be it cotton, polyester, lining, nylon, and so on, can be coated using dip coating or spray coating methods. A common nanoparticle of choice is SiO 2 , which is commercially available and can be also easily synthesized 10,14,25–27 . For example, Y.D.…”

“…It was found that the textured and hydrophobic nature of the waxes found on lotus leaves are what made it superhydrophobic. 2 Since the illumination of the self-cleaning effect of the lotus leaf, various endeavors have been undertaken to fabricate superhydrophobic surfaces with practical application in mind, such as self-cleaning surfaces, [3][4][5][6][7] water repellent textiles, [8][9][10][11][12][13][14] and membranes/ interfaces for oil/water separation. [15][16][17][18][19] Water repellency is a desired feature of fabrics in the manufacture of raincoats, hostelry, wet-suits, tarpaulin, table cloth, shower curtain, and so on where water repellency enables self-cleaning, thus reducing maintenance costs.…”

“…A common nanoparticle of choice is SiO 2 , which is commercially available and can be also easily synthesized. 10,14,[25][26][27] For example, Y.D. Kim and colleagues prepared a colloidal solution by first vapor phase coating of SiO 2 nanoparticles with PDMS at 300 K for 16 h, followed by dispersing the PDMS-coated SiO 2 nanoparticles in the PDMS dispersion of hexane.…”