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中文摘要：
微生物气单胞杆菌（SH10）干粉在60℃、碱性条件下，可以快速还原银氨溶液得到稳定的银溶胶。采用水溶性的有机溶剂乙醇可沉淀银溶胶。真空干燥后可制得水溶性纳米银粉。采用原子吸收分光光度法（AAS）测定银粉中的银含量；利用紫外可见光谱（UV—Vis）仪、X射线粉末衍射（XRD）仪、低倍透射电镜（TEM）对SH10干菌粉还原银氨溶液的产物进行表征；结果表明：银粉的平均粒径为6．69nIn，其水溶性、分散性较好。通过SH10干菌粉还原银氨溶液前后红外光谱（FTIR）图的变化，对SH10干菌粉还原银氨溶液的机理进行探讨。
英文摘要：
Under alkaline conditions, the stable silver sol can be prepared by reducing silver ammonia solution with aeromonas punctata （SH10） at 60 ℃Silver sol can be precipitated by ethanol and watersoluble silver nanopowder can be obtained when silver sol was dried in vacuum. The silver content was determined using atomic absorption spectroscopy （AAS）. UV-Vis spectrometer, X-ray powder diffraction （XRD） instrument and low power transmission electron microscopy （TEM） were used to characterize the silver nanopowder produced through silver ammonia reduced by SH10 dry bacteria powder. Resuits showed that the average size of silver nanopowder was 6.69 nm, and the water - solublity and dis- persibility of silver nanopowder were well. The mechanism of silver ammonia reduced by SH10 dry bacteria powder was discussed by comparing infrared spectroscopy （FTIR） before and after reduction.
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