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首页> 外文期刊>Nanotechnology >Reversible, reagentless solubility changes in phosphatidylcholine-stabilized gold nanoparticles
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Reversible, reagentless solubility changes in phosphatidylcholine-stabilized gold nanoparticles

机译：磷脂酰胆碱稳定的金纳米颗粒中可逆的无试剂溶解度变化

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摘要

Phosphatidylcholine (PC) is a versatile ligand for synthesizing gold nanoparticles that are soluble in either organic or aqueous media. Here we report a novel route to organic-soluble, PC-stabilized gold nanoparticles that can be re-suspended in water after removal of the organic solvent. Similarly, we show that PC-stabilized gold nanoparticles synthesized in water can be re-suspended in organic solvents after complete removal of water. Without complete removal of the solvent, the nanoparticles retain their original solubility and do not phase transfer. This change in solvent preference from organic to aqueous and vice versa without the use of an additional phase transfer reagent is novel, visually striking, and of utility for synthetic modification of nanoparticles. This approach allows chemical reactions to be performed on nanoparticles in organic solvents followed by conversion of the products to water-soluble materials. A narrow distribution of PC-stabilized gold nanoparticles was obtained after phase transfer to water as characterized by UV-visible (UV-vis) spectroscopy and transmission electron microscopy (TEM), demonstrating that the narrow distribution obtained from the organic synthesis is retained after transfer to water. This method produces water-soluble nanoparticles with a narrower dispersity than is possible with direct aqueous synthesis.
机译：磷脂酰胆碱（PC）是一种通用的配体，用于合成可溶于有机或水性介质的金纳米颗粒。在这里，我们报告了一条新的途径，即一种有机溶解的，经PC稳定的金纳米颗粒，该途径可以在去除有机溶剂后重新悬浮在水中。同样，我们显示出水中合成的PC稳定的金纳米颗粒可以在完全去除水后重新悬浮在有机溶剂中。如果不完全除去溶剂，则纳米颗粒保持其原始溶解度并且不发生相转移。在不使用额外的相转移试剂的情况下，溶剂偏好从有机到水性的改变，反之亦然，是新颖的，视觉上引人注目的，并且可用于纳米粒子的合成修饰。这种方法允许在有机溶剂中对纳米颗粒进行化学反应，然后将产物转化为水溶性材料。相转移到水中后，PC稳定的金纳米颗粒的分布狭窄，通过紫外可见光谱和透射电子显微镜（TEM）表征，表明转移后保留了有机合成获得的狭窄分布浇水。与直接水合成相比，该方法可生产具有更窄分散性的水溶性纳米颗粒。

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