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Size-Controlled Dissolution of Organic-Coated Silver Nanoparticles

机译：大小受控的有机涂层银纳米粒子的溶解

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摘要

The solubility of Ag NPs can affect their toxicity and persistence in the environment. We measured the solubility of organic-coated silver nanoparticles (Ag NPs) having particle diameters ranging from 5 to 80 nm that were synthesized using various methods, and with different organic polymer coatings including poly(vinylpyrrolidone) and gum arabic. The size and morphology of Ag NPs were characterized by transmission electron microscopy (TEM). X-ray absorption fine structure (XAFS) spec- troscopy and synchrotron-based total X-ray scattering and pair distribution function (PDF) analysis were used to determine the local structure around Ag and evaluate changes in crystal lattice parameters and structure as a function of NP size. Ag NP solubility dispersed in 1 mM NaHCO_3 at pH 8 was found to be well correlated with particle size based on the distribution of measured TEM sizes as predicted by the modified Kelvin equation. Solubility of Ag NPs was not affected by the synthesis method and coating as much as by their size. Based on the modified Kelvin equation, the surface tension of Ag NPs was found to be ~1 J/m~2, which is expected for bulk fcc (face centered cubic) silver. Analysis of XAFS, X-ray scattering, and PDFs confirm that the lattice parameter, a, of the fcc crystal structure of Ag NPs did not change with particle size for Ag NPs as small as 6 nm, indicating the absence of lattice strain. These results are consistent with the finding that Ag NP solubility can be estimated based on TEM-derived particle size using the modified Kelvin equation for particles in the size range of 5-40 nm in diameter.
机译：Ag NPs的溶解度会影响其毒性和在环境中的持久性。我们测量了粒径5到80 nm的有机涂层银纳米颗粒（Ag NPs）的溶解度，这些纳米颗粒是使用各种方法合成的，并且使用了不同的有机聚合物涂层，包括聚乙烯吡咯烷酮和阿拉伯树胶。 Ag NPs的大小和形态通过透射电子显微镜（TEM）表征。 X射线吸收精细结构（XAFS）光谱和基于同步加速器的总X射线散射和对分布函数（PDF）分析被用于确定Ag周围的局部结构，并评估晶格参数和结构的函数变化NP大小。根据修改后的Kelvin方程预测的TEM尺寸分布，发现分散在pH为8的1 mM NaHCO_3中的Ag NP溶解度与粒径具有良好的相关性。 Ag NPs的溶解度不受合成方法和涂层的影响，与其大小无关。根据改进的开尔文方程，发现银纳米颗粒的表面张力为〜1 J / m〜2，这对于散装fcc（面心立方）银是预期的。 XAFS，X射线散射和PDF的分析证实，Ag NPs的fcc晶体结构的晶格参数a不会随粒径的变化而变化，而Ag NPs的粒径小至6 nm，表明不存在晶格应变。这些结果与以下发现是一致的：可以使用改进的Kelvin方程，针对直径在5-40 nm范围内的颗粒，基于TEM衍生的颗粒大小来估计Ag NP溶解度。

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  • 来源
    《Environmental Science & Technology》 |2012年第2期|p.752-759|共8页
  • 作者

    Rui Ma; Clement Levard; Stella M. Marinakos; Yingwen Cheng; Jie Liu; F. Marc Michel; Gordon E. Brown; Gregory V. Lowry;

  • 作者单位

    Center for the Environmental Implications of NanoTechnology (CEINT), Duke University, Durham, North Carolina 27708,Department of Civil & Environmental Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213;

    Center for the Environmental Implications of NanoTechnology (CEINT), Duke University, Durham, North Carolina 27708,Department of Geological & Environmental Sciences, Stanford University, Stanford, California 94305, United States;

    Center for the Environmental Implications of NanoTechnology (CEINT), Duke University, Durham, North Carolina 27708;

    Center for the Environmental Implications of NanoTechnology (CEINT), Duke University, Durham, North Carolina 27708,Department of Chemistry, Duke University, Durham, NC27708;

    Center for the Environmental Implications of NanoTechnology (CEINT), Duke University, Durham, North Carolina 27708,Department of Chemistry, Duke University, Durham, NC27708;

    Center for the Environmental Implications of NanoTechnology (CEINT), Duke University, Durham, North Carolina 27708,Department of Geological & Environmental Sciences, Stanford University, Stanford, California 94305, United States,Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States;

    Center for the Environmental Implications of NanoTechnology (CEINT), Duke University, Durham, North Carolina 27708,Department of Geological & Environmental Sciences, Stanford University, Stanford, California 94305, United States,Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States,Department of Photon Science, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States;

    Center for the Environmental Implications of NanoTechnology (CEINT), Duke University, Durham, North Carolina 27708,Department of Civil & Environmental Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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