Preparation of superhydrophobic coatings with excellent durability by synergistic reinforcement of cationic starch and tannic acid.

Int J Biol Macromol

College of Textile Science and Engineering, Jiangnan University, Wuxi 214122, PR China. Electronic address:

Published: November 2024

The intrinsic hydrophilicity of sustainable and environmentally friendly biobased materials like starch and its derivatives limits their potential as hydrophobic functional materials. This study presents an eco-friendly and non-toxic method to create coatings with exceptionally high hydrophobicity. Octadecyltrimethoxysilane (ODS) reacts with nano silica (SiO) through a silane coupling reaction to form superhydrophobic SiO. The Si-OH groups generated from ODS hydrolysis can undergo a condensation reaction with tannic acid (TA), which is rich in phenolic hydroxyl groups. This enables the hydrophobic silane to bind indirectly with cationic starch (CS), resulting in a stable superhydrophobic CS-based coating. The coating demonstrates significant hydrophobicity (contact angle >170°), excellent UV light transmittance (<4.05 %), self-cleaning properties, prolonged shelf life (over eight months), antibacterial activity, and encapsulation capability. It also shows a separation efficiency exceeding 99 % after 25 oil-water separation cycles and is easily recoverable. The study elucidates the mechanism behind the preparation process and the factors enhancing hydrophobic properties. The research findings suggest that the novel, cost-effective CS/TA/ODS/SiO coating offers a scalable solution for superhydrophobic applications and broadens the horizon for green starch use in hydrophobic materials.

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Source
http://dx.doi.org/10.1016/j.ijbiomac.2024.135954DOI Listing

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