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首页> 外文期刊>Environmental Science & Technology >Evaluating Aggregation of Gold Nanoparticles and Humic Substances Using Fluorescence Spectroscopy
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Evaluating Aggregation of Gold Nanoparticles and Humic Substances Using Fluorescence Spectroscopy

机译：使用荧光光谱法评估金纳米粒子和腐殖质的聚集

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摘要

The fate and transport of diagnostic gold nanoparticles in surface waters would significantly depend on their interactions with humic substances, which are ubiquitously found in natural aquatic systems. The current study employs UV-visible absorbance and fluorescence spectroscopy to investigate the interactions of commercial humic acid (HA) with gold nanoparticles having a core size of 5 nm and coated with two different stabilizers,β-D-glucose and citrate. Humic substances (HS) are fluorescent in nature, providing a unique probe of nanometer-scale morphological changes for interactions between these natural polyelectrolyr.es and water-soluble gold nanoparticles. Quenching of fluorescence intensity was observed with β-D-glucose-coated gold nanoparticles, whereas an enhancement effect was noticed with the citrate-coated particles when mixed with HA having concentrations of 2 and 8 ppm (surface waters typically may contain ～10 ppm HS). Examining the quenching and enhancement of fluorescence provides insight into the structural changes taking place at the coated gold nanoparticle-HA interface. The quenching behavior suggested ligand exchange due to nanometer-scale contact between the HA and β-D-glucose-coated gold nanoparticles, whereas the enhancement effect with citrate particles would indicate overcoating, leading to increased transfer distances for fluorescence resonance energy transfer.
机译：诊断性金纳米颗粒在地表水中的命运和运输将在很大程度上取决于它们与腐殖质的相互作用，腐殖质在自然水生系统中普遍存在。当前的研究采用紫外可见吸收和荧光光谱法研究商业腐殖酸（HA）与核心大小为5 nm并涂有两种不同稳定剂（β-D-葡萄糖和柠檬酸盐）的金纳米颗粒之间的相互作用。腐殖质（HS）本质上是荧光性的，为这些天然聚电解质与水溶性金纳米颗粒之间的相互作用提供了纳米级形态变化的独特探针。用β-D-葡萄糖包被的金纳米颗粒观察到荧光强度的猝灭，而当柠檬酸盐包被的颗粒与浓度为2和8 ppm的HA混合时，柠檬酸盐包被的颗粒具有增强作用（地表水通常可能含有〜10 ppm HS ）。检查荧光的猝灭和增强可提供对涂层金纳米粒子-HA界面发生的结构变化的深入了解。猝灭行为表明由于HA和β-D-葡萄糖包被的金纳米颗粒之间的纳米级接触而引起的配体交换，而柠檬酸盐颗粒的增强作用表明涂层被覆，导致荧光共振能量转移的转移距离增加。

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  • 来源
    《Environmental Science & Technology》 |2009年第19期|7531-7535|共5页
  • 作者

    VASANTA L. PALLEM; HOLLY A. STRETZ; MARTHA J. M. WELLS;

  • 作者单位

    Department of Chemical Engineering, Tennessee Technological University Cookeville, Tennessee 38505 Center for the Management, Utilization, and Protection of Water Resources, Tennessee Technological University Cookeville,Tennessee 38505;

    Department of Chemical Engineering, Tennessee Technological University Cookeville, Tennessee 38505;

    Center for the Management, Utilization, and Protection of Water Resources, Tennessee Technological University Cookeville,Tennessee 38505 Department of Chemistry, Tennessee Technological University Cookeville, Tennessee 38505;

  • 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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