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水的介电常数对在高温高压微波反应器中合成的铂纳米颗粒形状的影响。

The influence of dielectric permittivity of water on the shape of PtNPs synthesized in high-pressure high-temperature microwave reactor.

作者信息

Wojnicki Marek, Luty-Błocho Magdalena, Kwolek Przemysław, Gajewska Marta, Socha Robert P, Pędzich Zbigniew, Csapó Edit, Hessel Volker

机构信息

Faculty of Non-Ferrous Metals, AGH University of Science and Technology, Mickiewicza Ave. 30, 30-059, Kraków, Poland.

Department of Materials Science, Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Aleja Powstańców Warszawy 12, 35-959, Rzeszow, Poland.

出版信息

Sci Rep. 2021 Mar 1;11(1):4851. doi: 10.1038/s41598-021-84388-2.

DOI:10.1038/s41598-021-84388-2
PMID:33649494
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7921409/
Abstract

In this paper, a novel method for the synthesis of Pt nanoparticles (PtNPs) using a microwave autoclave reactor is proposed. For benchmarking, the obtained results are compared with the traditional, batch method. A novel process window is proposed, which is the application of high-temperature and high-pressure. The main finding is that this only brings advantage, when the ionic strength of the system is enough low. It is explained, that at high pressure and high temperature, water behaves like only a slightly polar solvent, approaching a subcritical state. This reduces the electrostatic stabilization of the particles. Moreover, a change in the Pt particle shape is observed under high pressure and temperature conditions, suggesting that additional physical-chemical processes are involved.

摘要

本文提出了一种利用微波高压釜反应器合成铂纳米颗粒（PtNPs）的新方法。为了进行基准测试，将所得结果与传统的间歇法进行了比较。提出了一个新的工艺窗口，即高温高压的应用。主要发现是，只有当系统的离子强度足够低时，这才会带来优势。据解释，在高压和高温下，水的行为类似于仅具有轻微极性的溶剂，接近亚临界状态。这降低了颗粒的静电稳定性。此外，在高压和高温条件下观察到铂颗粒形状的变化，表明涉及额外的物理化学过程。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad90/7921409/e44caa8c9013/41598_2021_84388_Fig14_HTML.jpg
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