In situ temperature measurements of reaction spaces under microwave irradiation using photoluminescent probes
In situ temperature measurements of reaction spaces under microwave irradiation using photoluminescent probes
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DOI：
10.1039/c6cp02034h
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发表时间：
2016-05-21
影响因子：
3.3
通讯作者：
Wada, Yuji
中科院分区：
文献类型：
--
作者：
Ano, Taishi;Kishimoto, Fuminao;Wada, Yuji
我们展示了两种新的方法，用于测量由微波局部加热的反应空间的温度，这两种方法已应用于两个示例系统，即，包覆有SiO2壳层的BaTiO 3颗粒（BaTiO 3-SiO2）和层状钨酸盐颗粒。光致发光（PL）探针显示其PL寿命的温度敏感性位于上述系统的纳米空间。在BaTiO 3-SiO2核-壳颗粒的情况下，罗丹明B负载到覆盖BaTiO 3核的SiO2壳的中孔中，其通过微波的介电损耗产生热。在24 W的微波辐射下，SiO2壳的内部纳米空间温度被确定为比本体温度高28 ℃。另一方面，Eu 3+被固定在层状钨酸盐的层间空间作为PL探针，显示层间的纳米空间温度仅比体相温度高4摄氏度。这种测温方法对于控制微波加热是很有效的，它阐明了在化学反应中经常观察到的微波特殊效应的模糊机理，对微波在化学和材料科学中的实际应用作出了很大贡献。
We demonstrate two novel methods for the measurement of the temperatures of reaction spaces locally heated by microwaves, which have been applied here to two example systems, i.e., BaTiO3 particles covered with a SiO2 shell (BaTiO3-SiO2) and layered tungstate particles. Photoluminescent (PL) probes showing the temperature-sensitivity in their PL lifetimes are located in the nanospaces of the above systems. In the case of BaTiO3-SiO2 core-shell particles, rhodamine B is loaded into the mesopores of the SiO2 shell covering the BaTiO3 core, which generates the heat through the dielectric loss of microwaves. The inner nanospace temperature of the SiO2 shell is determined to be 28 degrees C higher than the bulk temperature under microwave irradiation at 24 W. On the other hand, Eu3+ is immobilized in the interlayer space of layered tungstate as the PL probe, showing that the nanospace temperature of the interlayer is only 4 degrees C higher than the bulk temperature. This method for temperature-measurement is powerful for controlling microwave heating and elucidates the ambiguous mechanisms of microwave special effects often observed in chemical reactions, contributing greatly to the practical application of microwaves in chemistry and materials sciences.