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Durable superoleophobic–superhydrophilic fabrics with high anti-oil-fouling property

Zhou, Hua, Wang, Hongxia, Yang, Weidong, Niu, Haitao, Wei, Xin, Fu, Sida, Liu, Shuai, Shao, Hao, Lin, Tong
RSC advances 2018 v.8 no.47 pp. 26939-26947
air, cleaning, contact angle, cotton fabric, detergents, hydrophilicity, moieties, nanoparticles, oils, silane, silica, surface tension
Although a number of methods have been reported for the preparation of superoleophobic–superhydrophobic surfaces, a challenge still remains in preparing a surface showing simultaneous superoleophobicity and superhydrophilicity. Herein, we demonstrate a novel strategy for preparing a simultaneously superhydrophilic–superoleophobic surface on cotton fabrics. A wet chemical coating method was employed to apply an oligomer which consists of a fluorinated alkyl and a PEG-phosphate hydrophilic moiety, silica nanoparticles and fluoroalkyl silane, onto fabric substrates. The treated fabrics exhibited both superoleophobicity and superhydrophilicity with a contact angle over 150° for oil fluids (surface tension > 27 mN m⁻¹) but 0° for water. Water can spread into the fabric matrix within 2 seconds. The superhydrophilic–superoleophobic fabric had excellent superoleophobicity no matter whether it was at the dry state in air, pre-wetted with water, or in underwater conditions. When being contaminated forcedly with oil or oil-free dirt, the fabric can be easily cleaned up with water without using any detergent and chemical agent. Superoleophobic–superhydrophilic surfaces may provide an alternative and feasible way for anti-fouling applications.