Antibacterial Activity of Surface-Modified Fabric with Ag/AgCl-Doped Quaternary Ammonium-Modified Silicate Hybrid
Kuo-Hui Wu1, Yin-Chiung Chang2, Ken-Fa Cheng1
1Department of Chemistry and Meterials Engineering, Chung Cheng Institute of Technology, National Defense University, Tahsi, Taoyuan, 33551, Taiwan.
Abstract:
An organic-inorganic hybrid antibacterial material based on Ag/AgCl and quaternary ammoniummodified silicate (Ormosil (NR+₄ Cl-)) was prepared by sol-gel processes and an in situ reduction method, in which silver nitrate, tetraethoxysilane (TEOS), N-trimethoxysilylpropyl-N,N,Ntrimethylammonium chloride (TMAPS) and N-[3-(trimethoxysilyl)propyl]diethylenetriamine (ATS) acted as precursor, linker and colloidal suspension stabilizer, respectively. The physical properties of the Ormosil (NR+₄ Cl-) and Ormosil (NR+₄ Cl-)/Ag hybrids were examined using XPS and TGA spectroscopy, the results of which indicated that Ag/AgCl was immobilized in channels by dipolar interactions with the Ormosil (NR+₄ Cl-) matrix. Ormosil (NR+₄ Cl-) and Ormosil (NR+₄ Cl-)/Ag sol solutions were used to functionalize non-woven fabrics by simply immersing the textiles into the dispersions in order to obtain antimicrobial fabrics. The antibacterial effects of the Ormosil/Ag- and Ormosil (NR+₄ Cl-)/Ag-modified fabrics against Gram-negative P. aeruginosa and E. coli, and Grampositive S. aureus and B. subtilis, were assessed using the zone of inhibition and the plate-counting method. The antibacterial efficacy was maintained even after 20 laundry cycles. The results indicated that the Ormosil/Ag and Ormosil (NR+₄ Cl-)/Ag hybrids are useful as non-leaching agents imparting durable antimicrobial properties to fabrics.
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