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Size-controlled and size-designed synthesis of nano/submicrometer Ag particles

机译:尺寸控制和尺寸设计的纳米/亚微米Ag颗粒合成

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A series of nano/submicrometer Ag particles with uniform size-distribution are prepared using ascorbic acid to reduce AgCl in aqueous solution and at ambient conditions. NaOH is used to adjust the redox potential of ascorbic acid, and polyvinylpyrrolidone (PVP) is used to balance the relative rates at which various crystallographic planes of Ag grow. Under the reaction conditions, the nucleation and growth steps are separated, thus controlling the anisotropic growth of the Ag crystals. The products are studied using transmission electron microscopy (TEM), high-resolution TEM (HR-TEM), field emission-scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and UV-vis spectrophotometry. On this basis, an equation for the relationship between the synthesis conditions and the size of the product was established, which can be applied to produce quantitatively size-controlled and size-designed Ag particles. Scale-up of the synthetic procedure is also conducted to test the prospect of large-scale synthesis of Ag particles for practical industrial applications.
机译:使用抗坏血酸来还原水溶液中和环境条件下的AgCl,可以制备出一系列具有均匀尺寸分布的纳米/亚微米级Ag颗粒。 NaOH用于调节抗坏血酸的氧化还原电势,而聚乙烯吡咯烷酮(PVP)用于平衡Ag各种晶体平面生长的相对速率。在反应条件下,成核和生长步骤是分开的,从而控制了Ag晶体的各向异性生长。使用透射电子显微镜(TEM),高分辨率TEM(HR-TEM),场发射扫描电子显微镜(FE-SEM),X射线衍射(XRD)和紫外可见分光光度法对产品进行了研究。在此基础上,建立了合成条件与产物尺寸之间关系的方程式,该方程式可用于生产定量控制尺寸和设计尺寸的Ag颗粒。还进行了合成程序的放大试验,以测试针对实际工业应用大规模合成Ag颗粒的前景。

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