Pan Based Nano TiO₂/Ag Composite Membrane Preparation And Its Antibacterial Properties

For nanometer PAN membrane were introduced in this paper the reason and the present situation of antibacterial finishing and the properties of nano silver and nano titanium dioxide and application status. This paper expounds the current status of antibacterial fabrics both at home and abroad. Using the current existing preparation of silver nanoparticles and nano titanium dioxide antibacterial fabric method, the advantages and disadvantages of adopting advanced magnetron sputtering technology, at room temperature, the nano silver deposition functional nanostructures on the surface of PAN based coating and coating of titanium dioxide, enhanced antibacterial properties on the surface of the fabric material.This topic mainly adopts nano PAN film made of electrostatic spinning technology, using the surface of the magnetron sputtering deposition technology, the PAN film deposited on nano silver coating and nanometer titanium dioxide, realize its special antibacterial properties.Paper studies the main factors influencing electrostatic spinning, by changing its influence factor, to select the optimal spinning conditions. Spinning voltage is too low, dope cannot reach nanoscale and YouZhu, when17v, fiber fiber forming effect is good, with the increase of voltage, fiber diameter, the more fine; Accept when the distance is too large, dope cannot reach receiving plate, has solidified in the air, when reduced to12cm, dope can reach the receiving plate, gradually form a thin film; Spinning solution concentration is too low, generated by the fiber morphology is poorer, contains a lot of beads, spinning solution concentration is too high, began fiber adhesion.The thesis mainly discusses the sputtering process parameters (sputtering time, sputtering power, sputtering pressure) and the time effect on the properties of anti-bacterial placed. With the method of measurement of bacteriostatic ring diameter, chose the strains of escherichia coli for experiment, for different process parameters and placed under the time of PAN based nano silver antibacterial performance test and nanometer titanium dioxide thin film samples. Antibacterial performance tests are carried out using AATCC90method, on the nano PAN surface sputtering plating silver and titanium dioxide, can make nanometer antimicrobial properties of PAN membrane has a lot to ascend. Magnetron sputtering PAN base separate silver plated film of the various factors that affect the antibacterial effects of primary and secondary order: sputtering power (W)(s)>> sputtering time sputtering pressure (Pa). And antimicrobial properties with the increase of sputtering power and sputtering time, will get higher, but after reaching a extremum, gradual rise in its antibacterial effect. Sputtering silver and titanium dioxide composite film, found that when the parameters of the silver is fixed, the titanium dioxide sputtering pressure and sputtering power, sputtering time is too low, ascension is not obvious antibacterial effect, may be main antibacterial effect of silver, and titania sputtering pressure, sputtering power, sputtering time is high, the antibacterial effect was worse instead. When the nano silver and silver and titanium dioxide composite membranes samples after different time for placement in the air, the antibacterial effect of the sample over time will be decreased, but the silver film drops off more sharply over time, and weak antimicrobial properties of the composite film decreased.Paper of silver and titanium dioxide composite coating microstructure is also discussed, such as:coating particles structure and crystalline structure of the coating and the surface morphology of coating were characterized and analyzed. As is indicated in the spectrometer, identified under different sputtering parameters, nano silver and titanium dioxide sputtering on the PAN membrane; Using scanning electron microscopy (SEM) to observe the surface morphology of composite coating; Using atomic force microscope (AFM) analyzes the morphology characteristics of the composite coating; By means of X-ray diffraction (XRD) test and amorphous structure of the composite coating. SEM and AFM analysis results showed that due to the volatile nature of target material, a large number of sputtering of the nanometer silver nanostructure appears on the surface of PAN fiber, and the tio2film with the increase of sputtering power and sputtering time, nanometer titanium dioxide particles diameter increase gradually, gradually continuous on the silver film distribution, and start to pile up, the cambium-like membrane, but the change of the sputtering pressure, less effect on the nano titanium dioxide. X-ray diffraction analysis of the surface of the composite film crystallinity, found that as the increase of sputtering power, sputtering time, sputtering pressure, silver and titanium dioxide has been enhanced, the characteristics of the peak of silver and titanium dioxide made higher crystallinity.