Volume 134, Issue 6 e202114340
Forschungsartikel

Watching Microwave-Induced Microscopic Hot Spots via the Thermosensitive Fluorescence of Europium/Terbium Mixed-Metal Organic Complexes

Dr. Zhenyu Zhao

Dr. Zhenyu Zhao

School of Chemical Engineering and Technology in Tianjin University, National Engineering Research Center of Distillation Technology, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300350 China

These authors contributed equally to this work.

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Xi Shen

Xi Shen

School of Chemical Engineering and Technology in Tianjin University, National Engineering Research Center of Distillation Technology, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300350 China

These authors contributed equally to this work.

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Prof. Hong Li

Corresponding Author

Prof. Hong Li

School of Chemical Engineering and Technology in Tianjin University, National Engineering Research Center of Distillation Technology, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300350 China

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Kai Liu

Kai Liu

School of Chemical Engineering and Technology in Tianjin University, National Engineering Research Center of Distillation Technology, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300350 China

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Haoyu Wu

Haoyu Wu

School of Chemical Engineering and Technology in Tianjin University, National Engineering Research Center of Distillation Technology, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300350 China

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Prof. Xingang Li

Prof. Xingang Li

School of Chemical Engineering and Technology in Tianjin University, National Engineering Research Center of Distillation Technology, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300350 China

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Prof. Xin Gao

Corresponding Author

Prof. Xin Gao

School of Chemical Engineering and Technology in Tianjin University, National Engineering Research Center of Distillation Technology, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300350 China

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First published: 05 December 2021
Citations: 2

Abstract

The hypothesis of microscopic hot spots is widely used to explain the unique microwave (MW) effect in materials science and chemical engineering, but it has not yet been directly measured. Herein we use Eu/Tb mixed-metal organic complexes as nano thermometers to probe the intrinsic temperature of MW-absorbing particles in MW fields based on the thermosensitive fluorescent spectra. According to the measurements of the temperature gradient at the solid/liquid interphase, we derive an MW-irradiated energy transfer model to predict the extent of microscopic hot spots. The fluorescence results agree with the model predictions that the MW-induced temperature gradient can be enlarged by increasing MW intensity, as well as the dielectric loss and size of particles. Conversely, the increase in the thermal conductivity and the dielectric loss of the liquid lowers the temperature gradient. This study enables control of MW-assisted synthesis and MW-responsive techniques.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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