Suspension of Silver Oxide Nanoparticles in Chitosan Solution and its Antibacterial Activity in Cotton Fabrics
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0920-S02-03
Suspension of Silver Oxide Nanoparticles in Chitosan Solution and its Antibacterial Activity in Cotton Fabrics Zhigang Hu1, Jin Zhang1, Wing Lai Chan2, and Yau Shan Szeto1 1 Institute of textiles and clothing, The Hong Kong Polytechnic University, ITC, PolyU, HungHom, KLN, Hong Kong, Hong Kong, Hong Kong 2 Department of applied biology and chemical technology, The Hong Kong Polytechnic University, ITC, PolyU, HungHom, KLN, Hong Kong, Hong Kong, Hong Kong
ABSTRACT New stable silver oxide suspension in chitosan solution was prepared from a mixture of silver nitrate and chitosan in dilute acetic acid as precursor, in which the complex interactions between silver ion and chitosan was also investigated through various instrumentation method seriously. The suspension was charactized through laser scan, infrared ray spectroscopy (IR), ultraviolet-visible spectroscopy (UV-vis) and X-ray diffraction (XRD), which indicated that the interactions between silver and chitosan in its precursor were destroyed partially. The measurements of the nanoparticles through scanning electron microscopy (SEM) and transmission electron microscopy (TEM) disclosed the spherical profiles of these silver oxide nanoparticles of 10-20nm in average. Cotton fabrics treated by this emulsion were entitled remarkable antibacterial activity against S aureus and E. coli at PH 5 and 7 with sightless color effect and good washing fastness. INTRODUCTION Silver-based antibacterial materials attracts much attention because of their long-term biocidal activity, low volatility and the nontoxicity of the active silver ion to mammalian cells1,2 as well as its perfect antibacterial activity.3-5 Many of these materials have been introduced, which are prepared through either doping silver onto the host materials6,7 or compositing it with other compounds.8,9 Whereas, to our knowledge, few efforts are done about a aqueous suspension of silver-based materials. A uniform and stable emulsion is believed to be advantageous in many fields, for instance, directly coating of biomaterials, devices or medical textiles in the biologic or therapeutically applications, spraying or dispersing into the circumstance for hygienic purpose. Most of presented works have to use additional surfactant, reductant, emulsifier or other assistant agents, which usually cause side-effects or be toxic. Meanwhile, chitosan is wildly used as a natural polysaccharide deriving from chitin because of its excellent properties, such as antibacterial, nontoxic, biodegradable, biocompatible.10-14 Another important property of chitosan is that the amino groups and hydroxyl groups of chitosan can form chelate complex with silver ion.15, 16 This property provides a possibility to use chitosan as both reductant and surfactant in the preparation of nano scale silver-based materials from silver ion. Works have been done on the preparation of chitosan/silver nanocomposites, which prove the ability of chitosan to reduce silver ion into metallic silver.17-21 But most of these nanocomposites are solid,
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