A self-roughing PDMS-tannic acid coating decorated superhydrophobic cotton fabric for self-cleaning and UV protection
摘要
Superhydrophobic and ultraviolet protective functionalities hold significant potential for outdoor textile applications, however, the development of efficient and straightforward surface modification strategies remains challenging. In this study, we sequentially achieved the co-deposition of tannic acid (TA) and aminopropyltriethoxysilane (APTES), followed by the chelation of ferric ions (Fe3+) and the final coating of polydimethylsiloxane (PDMS), thereby constructing a multilayer composite coating with a nanostructured surface. The resulting coatings significantly enhanced the surface roughness of the fibers, achieving excellent superhydrophobicity (water contact angle of 153°) and efficient UV shielding (up to 192 in ultraviolet protection factor), while also exhibiting superior self-cleaning properties. Notably, the introduction of ferric ions not only preserved the integrity of the nanostructure, but also further enhanced the UV protective performance. The synergistic effect of the PDMS coating and the nanorough structure imparted long-lasting hydrophobicity and low adhesion to the fabric. This multifunctional textile coating strategy offers an innovative approach for the development of self-cleaning and high-performance protective fabrics, with promising applications in outdoor apparel functional textiles.