Characterization and mechanism for the protection of photolytic decomposition of N-halamine siloxane coatings by titanium dioxide

Ying Liu, Jing Li, Lin Li, Stuart McFarland, Xuehong Ren, Orlando Acevedo, T. S. Huang

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

N-Halamine antibacterial materials have superior inactivation activities due to oxidative chlorine species. However, N-Cl bonds and bonds between N-halamine and substrates often decompose rapidly under UV irradiation, leading to unrecoverable loss of antimicrobial activity. In this study, titanium dioxide was covalently bonded onto N-halamine siloxane poly[5,5-dimethyl-3-(3′-triethoxysilylpropyl)hydantoin] (PSPH) via a sol-gel process. Experimental testing of the chlorinated cotton fabrics treated with TiO2/PSPH demonstrated that the residual oxidative chlorine in cotton-TiO2/PSPH-Cl was still effective for inactivating bacteria after 50 washing cycles and under UV light irradiation for 24 h. Quantum mechanical calculations found that TiO2 improves the UV stability of the PSPH-Cl system by increasing the activation barrier of the C-Si scission reaction responsible for the loss of the biocidal hydantoin moiety. SEM, XPS and FTIR spectra were used to characterize the coated cotton samples. Cotton-TiO2/PSPH-Cl samples exhibited good antibacterial activity against Staphylococcus aureus (ATCC 6538) and Escherichia coli O157:H7 (ATCC 43895). The storage stability and washing stability of treated cotton fabrics were also investigated.

Original languageEnglish (US)
Pages (from-to)3516-3523
Number of pages8
JournalACS Applied Materials and Interfaces
Volume8
Issue number5
DOIs
StatePublished - Feb 10 2016

Keywords

  • antibacterial
  • DFT calculations
  • inorganic/organic hybrid
  • N-halamine siloxane
  • titanium dioxide
  • UV stability

ASJC Scopus subject areas

  • Materials Science(all)

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