Synthesis of silver nanoparticles and antibacterial property of silk fabrics treated by silver nanoparticles
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NANO EXPRESS
Open Access
Synthesis of silver nanoparticles and antibacterial property of silk fabrics treated by silver nanoparticles Guangyu Zhang1, Yan Liu2, Xiaoliang Gao2 and Yuyue Chen1*
Abstract A silver nanoparticle solution was prepared in one step by mixing AgNO3 and a multi-amino compound (RSD-NH2) solution under ambient condition. RSD-NH2 was in-house synthesized by methacrylate and polyethylene polyamine in methanol, which has abundant amino and imino groups. However, the characterization of silver nanoparticles indicated that these nanoparticles are easy to agglomerate in solution. Therefore, an in situ synthesis method of silver nanoparticles on the silk fabrics was developed. The examined results confirmed that the in situ synthesized silver nanoparticles were evenly distributed on the surface of fibers. The inhibition zone test and the antibacterial rate demonstrated that the finished fabrics have an excellent antibacterial property against Staphylococcus aureus and Escherichia coli. Moreover, the nanosilver-treated silk fabrics were laundered 0, 5, 10, 20, and 50 times and still retained the exceptional antibacterial property. When the treated fabrics were washed 50 times, the antibacterial rate is more than 97.43% for S. aureus and 99.86% for E. coli. The excellent laundering durability may be attributed to the tight binding between silver nanoparticles and silk fibers through the in situ synthesis. This method provides an economic method to enhance the antibacterial capability of silk fabrics with good resistance to washings. Keywords: Silver nanoparticle; Multi-amino compound (RSD-NH2); Antibacterial activity; Silk fabric
Background With the development of science and technology and the improvement of the living standard, people have continuously strengthened their awareness on health and environmental protection of clothing [1]. Silk fabrics are highly popular with people for their excellent properties such as softness and gorgeous appearance, so they enjoy the honor as ‘The Queen of Fibers.’ However, silk fabrics provide an excellent environment for microorganisms to reproduce because of their large surface area and ability to retain moisture in the grids of fabrics. Therefore, to study and to improve the antibacterial properties of silk fabrics have an important influence on social significance and economic benefits [2-4]. To enhance the antibacterial properties of silk fabrics, silver nanoparticles are utilized to be attached onto the fabrics, although the mechanism is still in debate [5]. In * Correspondence: [email protected] 1 College of Textile and Clothing Engineering, Soochow University, Suzhou 215021, China Full list of author information is available at the end of the article
previous studies, it was indicated that the use of a strong reductant such as borohydride promotes the formation of silver nanoparticles in the solution, which have a narrow size distribution. However, the severe deficiency confronted during the preparation of nanoparticles is the stability of the solution
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