Synthesis and characterization of polyvinylpyrrolidone coated cerium oxide nanoparticles.
Synthesis and characterization of polyvinylpyrrolidone coated cerium oxide nanoparticles.
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DOI：
10.1021/es402541z
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发表时间：
2013-10
影响因子：
11.4
通讯作者：
R. Merrifield;Z. Wang;R. Palmer;J. Lead
中科院分区：
文献类型：
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作者：
R. Merrifield;Z. Wang;R. Palmer;J. Lead
迫切需要为环境纳米科学和纳米毒理学开发标准和参考纳米材料。为此目的，制备聚乙烯吡咯烷酮（PVP）涂覆的二氧化铈纳米颗粒（NP）的悬浮液。通过使用不同的PVP链长制备四种不同尺寸的单分散样品。这些纳米颗粒的化学和物理性质，其特征在于制备和在不同的生态毒理学暴露介质。动态光散射分析表明，样品是单分散的，与不变的大小时，悬浮在不同的媒体超过72小时的时间。电子显微镜证实了这一点，并揭示了较大的（约。20 nm）颗粒是由较小的单个颗粒（4-5 nm）组成的聚集体。电子能量损失谱（EELS）表明，最小和最大的样品几乎完全由铈（III）氧化物组成，只有少量的铈（IV）存在于最大的样品中。介质中溶解的铈浓度低且恒定，表明NP不随时间溶解。这些纳米颗粒的简单合成及其在不同环境条件下的物理和化学稳定性使其可能适合用作（生态）毒理学和地表水环境研究的参考材料。
There is a pressing need for the development of standard and reference nanomaterials for environmental nanoscience and nanotoxicology. To that aim, suspensions of polyvinylpyrrolidone (PVP)-coated ceria nanoparticles (NPs) were produced. Four differently sized monodispersed samples were produced by using different PVP chain lengths. The chemical and physical properties of these NPs were characterized as prepared and in different ecotoxicology exposure media. Dynamic light scattering analysis showed that the samples were monodispersed, with an unchanged size when suspended in the different media over a 72 h period. Electron microscopy confirmed this and revealed that the larger (ca. 20 nm) particles were aggregates composed of the smaller individual particles (4-5 nm). Electron energy loss spectroscopy (EELS) showed that the smallest and largest samples were composed almost entirely of cerium(III) oxide, with only small amounts of cerium(IV) present in the largest sample. Dissolved cerium concentrations in media were low and constant, showing that the NPs did not dissolve over time. The simple synthesis of the these NPs and their physical and chemical stability in different environmental conditions make them potentially suitable for use as reference materials for (eco)toxicology and surface water environmental studies.