Preparation And Application Of Sucrose Esters-Nanozno

Zinc oxide is a low-cost, non-toxic and environmentally friendly n-type semi-conductor, It has remarkable application potential in varistors, chemical sensors, cosmetic material, UV absorbers, Anti-bacterial agents. Sucrose fatty acid esters are green, biodegradable, non-toxic and safe non-ionic surfactants with raw material that comes from renewable sources, fatty acids and sugar.It can be used as a soft template for the synthesis of nano-materials.In this paper, nano-ZnO was synthesized from sodium hydroxide and zinc nitrate hexahydrate with mild, non-toxic food grade sucrose esters as a surfactant by Stirring and ultrasonification one-step way. The effects of different factors on particle size, such as NaOH concentration, Zn2+concentration, electric stirring-Ultrasound time, reaction temperature, ultrasonic time, ultrasonic power,the amount of sucrose esters and the mixing method were investigated;The as-synthesized nano-ZnO were characterized using dynamic light scattering (DLS), scanning electron microscopy, transmission electron microscope (TEM), X-ray diffractometer (XRD), UV-vis spectroscopy (UV-vis), Fourier Transform Infrared Spectroscopy(FTIR); In this paper, the nano-ZnO aqueous suspensions were prepared and the influence of ultrasonic time, ultrasonic temperature, ultrasonic power, pH value, type and content of dispersants and the amount of ethanol on the stability of nano-ZnO aqueous suspensions were studied; The antibacterial properties of the ZnO nanoparticles were tested against Staphylococcus aureus and Escherichia coli bacteria; common gauze supported zinc oxide nanoparticles were prepared by dipping methods.the antibacterial properties of composite antibacterial dressing were also studied by comparing the diameter of inhibition ring and antibacterial rate respectively. The results found that:When the reactant ratio [NaOH]:[Zn(OH)2]=2:1, the concentration of Zn2+=0.4mol.L-1, the stirring time=70min, reaction temperature=70.0℃, the ultrasonic time=15min, the ultrasonic power=400W and the amount of sucrose esters=0.2g L-1, the nano-zinc oxide with a average size of71.97nm was obtained; XRD analysis indicated that the ZnO nanoparticles have hexagonal structure, the average size of nano-ZnO was22nm and25nm, respectively, while the sucrose was addied and not. FTIR spectra show that the product containing ZnO and sucrose two materials; UV-vis spectroscopy shows that the maximum absorption wavelength of the synthesized product appears"blue shift" compared with bulk ZnO;The TEM photos revealed that when the amount of sucrose esters=0.2g L-1, the particle size of zinc oxide nanoparticles was smaller than that not added,and it was40±1nm, good dispersion, irregular round-shaped grains; The optimal dispersin condition of nano-ZnO were:ultrasonic time was10min, ultrasonic temperature was 50.0℃, ultrasonic power was200W, pH=9.0, ethanol adding amount was4mL and the concentration of sodium hexametaphosphate was0.0lg L-1;the antibacterial effect of Staphylococcus aureus is slightly better than E.coli and the antibacterial properties stronger than bulk ZnO. The inhibition ring of nano-ZnO-gauze dressing against Escherichia coli and Staphylococcus were increased as the ZnO concentration and impregnation time increased, the Optimum Temperature was50.0℃to E.coli,and50.0-60.0℃to Staphylococcus aureus;The antibacterial rate increased with the concentration of ZnO and impregnation time, the Optimum Temperature was60.0℃to E.coli,and50.0-60.0℃to Staphylococcus aureus.