Seth, Malobi and Khan, Hasmat and Jana, Sunirmal (2020) Hierarchically structured alpha-nickel hydroxide based superhydrophobic and antibacterial coating on cellulosic materials for oil-water separation. Materials Chemistry and Physics, 249. Art No-123030. ISSN 0254-0584

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Inspired by hierarchical surface structure of lotus leaf and insect wings, a uniform coating of disorderly oriented semi crystalline alpha-Ni(OH)(2) nanosheets for creating dual scale (micro-nano) has been developed on cellulosic materials (cotton and wood) by a one-step facile solution process. The coating shows an innate superhydrophobic nature with a static water contact angle (SCA) similar to 157 degrees and water shedding angle (WSA) similar to 10 degrees. Growth pattern, morphology and microstructure, thermogravimetric mass loss behaviour and chemical bonding of alpha-Ni(OH)(2) with commercially available cotton fabric as well as antibacterial activity of the coated fabric towards gram positive and negative bacteria have been studied systematically. For long term use as a filter cloth for oil-water separation, the coating is further modified with hexadecyltrimethoxysilane (HDTMS) restoring the hierarchical structure of alpha-Ni(OH)(2). The dual scale surface roughness as well as low surface energy long chain HDTMS layer renders the coating a stable SCA similar to 162 degrees and WSA similar to 8 degrees. The superhydrophobic and superoleophilic alpha-Ni(OH)(2)-HDTMS coating shows self-cleaning ability, similar to 99% oil-water separation efficiency including reusability over 50 separation cycles. The coated sample also shows excellent chemical and mechanical stability as well as laundering fastness. This facile fabrication process can make an avenue for development of other transition metal hydroxides based superhydrophobic and superoleophilic coatings on cellulosic materials.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 05 Feb 2021 07:02
Last Modified: 05 Feb 2021 07:02

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