Preparation And Properties Research Of Anti-bacterial Silk Fabrics By Magnetron Sputtering

In this paper, the reason and current situation of antibacterial finishing on the silk fabrics and nano-silver properties and applications were briefly introduced. The main methods of the research of antibacterial textiles home and abroad were analyzed. For there are drawbacks existing in these available techniques, in this research, magnetron sputter coating which is friendly to the environments was used to deposit nanostructured silver films on silk fabrics at room temperature to obtain the antibacterial properties.In this research, using magnetron sputtering surface deposition technique which is green environmental protection in low temperature conditions, the surface of silk fabrics was constructed a special coating to give the anti-bacterial properties. The impacts of sputtering parameters such as sputtering power, sputtering pressure and deposition time and laying time on antibacterial properties of the samples were investigated. The antibacterial performance of different process parameters on nano-structured silver film samples were tested with Escherichia coli and Staphylococcus aureus as test organism by shake flask test. The antibacterial test results revealed that the sputtering time and laying time had an impact on the anti-bacterial properties. When the sputtering time of 60s, the samples had shown good inhibition to E. coli and S. aureus, the inhibition rates were respectively 99.30% and 99.89%. As sputtering time prolonged, inhibition rate decreased slightly. Within a certain sputtering time, the inhibition rates had slight decline along with the sputtering power increased. With the increase of sputtering pressure, anti-bacterial properties of the samples had slightly improvement. After the samples of coating sliver were lied different time, the inhibition rates of E. coli and S. aureus decreased. The samples were lied after 28 days, the inhibition rate of E. coli obvious decline. However, the inhibition rate of S. aureus kept around 70%.The silver coating microstructure, such as coating thickness, coating the particle structure, the coating crystalline structure and the coating surface morphology, were characterized and analysed. The film surface morphology was observed by scanning electron microscopy (SEM); The silver film morphology characteristic and particle size were analysed using atomic force microscopy (AFM); The crystalline structure of thin films was tested by X-ray diffraction (XRD). SEM observation and AFM analysis showed that as the deposition time prolonged, the nano-silver particles on the fiber surface increased gradually. film thickness increased, and film density and uniformity get better and better. At the same time, the average size of silver nanoparticles increased. And the XRD tests indicated that the certain crystal structure of nano-structured films was formed on the surface of silk fabrics.The interfacial bonding under sputtering process between silk substrate and sputter coated copper was discussed by peel-off test in this study. Within the scope of the experiment, the interfacial bonding properties had a decline as the the increase of sputtering power. With the increase of sputtering pressure and sputtering time prolonged, the adhesion between the film and substrate also gradually enhanced.Finally, the breaking strength, air permeability and the drape coefficient of coating fabrics and blank fabrics were tested. The results showed that compared with the blank sample, breaking strength of coated silk fabric had somewhat decreased; Air permeability of coating fabrics had a degree of enhancement. However, drapability of coating fabrics slightly improved.