In Situ Self‐Assembled Polyoxotitanate Cages on Flexible Cellulosic Substrates: Multifunctional Coating for Hydrophobic, Antibacterial, and UV‐Blocking Applications

• Published in: Advanced functional materials Vol. 28; no. 23
• Main Authors: Li, Ning, Pranantyo, Dicky, Kang, En‐Tang, Wright, Dominic S., Luo, He‐Kuan
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc 06.06.2018
• Subjects: antibacterial fabrics; Assembly; Cages; Coating; Contact angle; Cotton; cotton fabrics; E coli; hydrophobic fabrics; Hydrophobicity; in situ self‐assembly; Materials science; Microparticles; Molecular chains; Multifunctional materials; polyoxotitanate; Substrates
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.201800345

Surface coating is a powerful approach to fabricate multifunctional materials that are essential for numerous applications. However, to achieve such multifunctional coating with a facile single‐step procedure, especially on flexible substrates, is still a big challenge, as current fabrication protocols usually require sophisticated equipment and complicated procedures. Here, a novel coating technology involving in situ self‐assembly of the polyoxotitanate (POT) cage [Ti18Mn4O30(OEt)20Phen3] is reported to fabricate multifunctional cotton fabrics in a single step. The in situ generated spherical microparticles of 0.8 µm average diameter are firmly mounted on the underlying cotton substrate, imparting the coated surface with robust hydrophobicity (water contact angle of 148.1 ± 5.4°), antibacterial activity (against Escherichia coli, Staphylococcus epidermidis, and Staphylococcus aureus), and excellent UV‐blocking performance (89% blocked at 350 nm). This coating technology is efficient, straightforward, requires no specialized equipment, and most importantly, is readily extendable to other flexible substrates. Combined with the rapidly developing area of POT cages and similar molecular materials, the reported technology based on in situ self‐assembly holds great promise for further advancing the fabrication of multifunctional flexible devices via a single‐step coating operation. A multifunctional cotton fabric is fabricated using a new coating technology involving in situ self‐assembly of polyoxotitanate cages. The in situ generated microparticles are all firmly mounted onto the underlying cotton substrate, giving the coated surface robust hydrophobicity, antibacterial properties, and UV‐blocking performance.