In Situ and Real-Time Monitoring of Nanoparticle Formation in Microemulsion by Means of Dielectric Spectroscopy.,Langmuir

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In Situ and Real-Time Monitoring of Nanoparticle Formation in Microemulsion by Means of Dielectric Spectroscopy.
Langmuir ( IF 3.7 ) Pub Date : 2020-09-02 , DOI: 10.1021/acs.langmuir.0c02128
Yanqiang Yu ₁ , Muhammad A Khan ₁ , Zhen Chen ₁

Affiliation

Dielectric spectroscopy was employed, for the first time, to monitor the formation process of silica nanoparticles in a nonionic surfactant-based microemulsion in situ and in real time. Two dominant relaxations were observed in the frequency range of 1 MHz–3 GHz during this process. The relaxation at the lower frequency range was confirmed to be mainly ascribed to interfacial polarization, whose relaxation parameters, together with the electrical property of the synthesis system, were used to characterize the evolution of this dynamic formation process. Four evolution stages are distinctively revealed, including an induction stage, a nucleation dominant stage, an early particle growth stage, and a late growth stage. The dynamic features at each evolution stages were discussed in terms of the dielectric characteristics of the system. It is strongly suggested that dielectric spectroscopy is an effective tool for the in situ mechanistic study of nanoparticle formation in microemulsion.

中文翻译：

通过介电谱法原位和实时监测微乳液中纳米颗粒的形成。

首次使用介电光谱法监测非离子表面活性剂基微乳液中二氧化硅纳米粒子的形成过程并实时。在此过程中，在1 MHz–3 GHz的频率范围内观察到两个主要的弛豫。低频范围内的弛豫被证实主要归因于界面极化，其弛豫参数与合成系统的电学性质一起用于表征该动态形成过程的演化。显着揭示了四个演化阶段，包括诱导阶段，成核主导阶段，早期颗粒生长阶段和晚期生长阶段。根据系统的介电特性，讨论了每个演化阶段的动态特征。强烈建议介电谱是用于原位的有效工具微乳液中纳米颗粒形成的机理研究。

更新日期：2020-09-22

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