Search

Your search keyword '"Di Jun"' showing total 881 results
Start Over Author "Di Jun"
881 results on '"Di Jun"'

59. Mechanical–thermal coupling in micro-nanocavity graphene/paraffin phase change energy storage materials for heat management.

Author

Wang, Yuhao, Yu, Junhong, Huang, Wentian, Di, Jun, Cai, Jinming, and Hu, Jianbo

Subjects
MECHANICAL loads, HEAT storage, PHASE transitions, HEAT capacity, THERMAL properties
Abstract

Combining the superior thermal conductivity of graphene and the outstanding heat storage of paraffin, micro-nanocavity graphene/paraffin nanocomposites (MNGPNs) have recently served as promising thermal management materials in high-power microelectronic devices. However, current evaluations of the thermal management performances of MNGPNs are restricted in the lab condition, deviating from the complex mechanical–thermal coupling environment in practical scenarios. Here, we have investigated the structural and thermal management properties of MNGPNs with varying mechanical loads by in situ electron microscopy and in situ thermal characterizations. Our results reveal distinct mechanical–thermal coupling effects along in-plane and out-of-plane directions of MNGPNs. Specifically, mechanical loading reduces the porosity and enhances the heat transfer capacity of MNGPNs in the out-of-plane direction, while mechanical loading along the in-plane direction causes local damage to the graphene structure and weakens the heat transfer capacity of MNGPNs. Since the heat management performance of MNGPNs is dominated by the in-plane thermal transport, MNGPNs with mechanical loading show a delayed phase transition response time and unchanged phase transition enthalpy. This work provides in situ mechanical guidance for the practical application of MNGPNs for heat management. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

86. A Novel Bismuth‐Rich Bi3O4Cl/BixOyIz Composite with Intensified Photocatalytic Internal Electrical Field for Photocatalytic Degradation of Antibiotics.

Author

Xing, Qingzeng, Ren, Shaoshi, Liu, Nianhua, Tong, Shuang, Nkudede, Emmanuel, Dong, Jintao, Di, Jun, Ji, Mengxia, Yin, Sheng, and Xia, Jiexiang

Subjects
PHOTODEGRADATION, IRRADIATION, ELECTRON paramagnetic resonance, SEMICONDUCTOR junctions, ELECTRIC fields, PHOTOCATALYSTS
Abstract

The enhancement of photocatalytic semiconductor degradation performance through a bismuth‐rich strategy and heterojunction engineering is considered a very effective approach. Herein, the bismuth‐rich Bi3O4Cl/BixOyIz composites are synthesized through a simple solvothermal reaction. The composites have an internal electric field because of their specific layered structure. Due to the difference between their covalent [BixOy]2+ layer and exchangeable halogen ion layer, the enhanced internal electric field facilitates electron transfer at the high‐quality interface of the semiconductor. The trace presence of Bi3O4Cl/BixOyIz (0.1 g L−1) can achieve an 88% removal of tetracycline (20 mg L−1) from the solution phase under visible light illumination in 120 min. The photocatalytic activity is much higher than that of pure BiOCl and BiOI. Furthermore, the material also exhibits high photocatalytic degradation performance for bisphenol A, doxycycline hydrochloride, etc. The excellent results further confirm the application range of the prepared photocatalysts. The superior photocatalytic activity of Bi3O4Cl/BixOyIz is attributed to the formation of a heterojunction and the generation of an internal electric field, which enhances charge separation and oxidation ability. Photoelectrochemical characterization can confirm the above views. Free radical trapping experiments and electron spin resonance show that heterojunctions can produce abundant •O2− and •OH under visible light irradiation. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results