Synthesis, characterization, and environmental behaviors of monodispersed platinum nanoparticles
Synthesis, characterization, and environmental behaviors of monodispersed platinum nanoparticles
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DOI：
10.1016/j.jcis.2019.01.036
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发表时间：
2019-03-22
影响因子：
9.9
通讯作者：
Baalousha, Mohammed
中科院分区：
文献类型：
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作者：
Sikder, Mithun;Wang, Jingjing;Baalousha, Mohammed
近几十年来，包括铂纳米颗粒(PtNPs)在内的铂族元素的释放一直在增加。然而，很少有研究研究PtNPs在环境介质中的命运、行为和影响。在这里，我们报道了一种合成五种不同尺寸(8.5+/-1.2，10.3+/-1.3，20.0+/-4.8，40.5+/-4.1和70.8+/-4.2 nm)的单分散柠檬酸盐和聚乙烯吡咯烷酮(PVP)包覆的PtNPs的方法，并用多种方法在相关的生物和毒理学介质中表征了它们的行为。总体而言，当PtNP尺寸大于每种分析技术的尺寸检测下限时，用动态光散射法、场流分级法、单粒子电感耦合等离子体质谱、透射电子显微镜和原子力显微镜测量的PtNPs尺寸都是一致的。测量的尺寸略有不同是由于分析技术、测量原理、NP形状和NP渗透性的不同。随着纳米颗粒尺寸的增大，PVP层厚度增加(从4.4 nm增加到11.35 nm)。Cit-PtNPs的临界凝聚浓度与NP尺寸无关，这可能是由于PtNPs表面电荷随NP尺寸的不同而不同。PtNP5在所测试的任何介质中均未发生显著溶解。PtNP5在Dulbecco的改良Eagle‘s培养基中没有明显聚集，但在中等硬度水和30ppt合成海水中形成聚集体，聚集体尺寸随PtNPs浓度的增加而增大。总体而言，本研究描述了一个具有不同可控NP大小和涂层的通用模型NP系统(即PtNPs)，该系统是可预测的、稳定的，有助于研究NPs在环境中的去向、行为、吸收和生态毒性。(C)2019 Elsevier Inc.保留所有权利。
The release of platinum group elements, including platinum nanoparticles (PtNPs), has been increasing over recent decades. However, few studies have investigated the fate, behavior and effects of PtNPs in environmental media. Here, we report a protocol for the synthesis of five different sizes (8.5 +/- 1.2, 10.3 +/- 1.3, 20.0 +/- 4.8, 40.5 +/- 4.1, and 70.8 +/- 4.2 nm) of monodispersed citrate- and polyvinylpyrrolidone (PVP)-coated PtNPs, together with a characterization of their behaviors using a multi method approach in relevant biological and toxicological media. In general, PtNPs sizes measured using dynamic light scattering, field flow fractionation, single-particle inductively-coupled plasma-mass spectroscopy, transmission electron microscopy and atomic force microscopy, were all in good agreement when PtNP sizes were larger than the size detection limits of each analytical technique. Slight differences in sizes measured were attributable to differences in analytical techniques, measuring principles, NP shape and NP permeability. The thickness of the PVP layer increased (from 4.4 to 11.35 nm) with increases in NP size. The critical coagulation concentration of cit-PtNPs was independent of NP size, possibly due to differences in PtNPs surface charges as a function of NP size. PtNP5 did not undergo significant dissolution in any media tested. PtNP5 did not aggregate significantly in Dulbecco's modified Eagle's medium; but they formed aggregates in moderately hard water and in 30 ppt synthetic seawater, and aggregate size increased with increases in PtNPs concentration. Overall, this study describes a general model NP system (i.e., PtNPs) of different controlled NP sizes and coatings that is predictable, stable and useful to investigate the fate, behavior, uptake, and eco-toxicity of NPs in the environment. (C) 2019 Elsevier Inc. All rights reserved.