纳米氧化高银的制备及抗菌性能

采用液相氧化沉淀法制备纳米氧化高银颗粒.以硝酸银为原料,氢氧化钠为沉淀剂,过硫酸钾为氧化剂,控制pH值为11,反应温度为80℃,在磁力搅拌器上反应30min,静置3h后,离心洗涤数次,70℃真空干燥3h,得到黑色纳米氧化高银颗粒.通过X射线衍射(XRD)、透射电子显微镜(TEM)对纳米氧化高银颗粒的形貌和结构进行表征；采用异养菌测试瓶法,用制备的氧化高银和粒径为30nm的纳米银对金黄色葡萄球菌进行抗菌性能测试.结果表明:制得的球形纳米颗粒粒径为10～30ntn;纳米氧化高银颗粒比纳米银具有更强的杀菌性能.

Preparation of nano-divalent silver oxide powder and its antibacterial properties

The nanometer divalent silver oxide powders were synthesized by the method of liquid phase oxidizing sedimentation.Silver nitrate as raw material,sodium hydroxide as the precipitating agent,potassium persulfate as the oxidant,controled pH 11,the reaction temperature was 80℃,30min reaction in the magnetic stirrer,then it rested for about three hours,it was centrifugal washed several times,vacuum drying at 70℃for three hours,and finally got bivalent black nano silver particles.Shape and structure of the nanoparticles was characterized by X-ray diffraction(XRD)and transmission electron microscopy(TEM).Heterotrophic bacteria testing by bottle method was used to test antimicrobial performance of the silver of high oxidation and silver nano-particle which were size of 30nm to Staphylococcus aureus.Results showed that : obtained spherical nanoparticles size is 10-30nm,and the silver nano particles of high oxidation was more effective antimicrobial performance than silver nano-particle.