Theoretical study of the thermal conductivity of silica glass?crystal composites
Theoretical study of the thermal conductivity of silica glass?crystal composites
复制标题
石英玻璃晶体复合材料导热系数的理论研究
DOI：
10.1111/jace.18806
复制
发表时间：
2022
影响因子：
3.9
通讯作者：
Mauro John C.
中科院分区：
文献类型：
--
作者：
Kim Hongyeun;Yang Yongjian;Tokunaga Hirofumi;Koike Akio;Ono Madoka;Mauro John C.
硅酸盐玻璃的热耗散在各种应用中引起了广泛的关注，并且对具有高热导率的玻璃的需求仍然是一个未解决的挑战。玻璃中导热性的结构起源仍然没有完全理解。本研究旨在阐明在二氧化硅玻璃基质中嵌入高导热结晶α石英的影响。我们考虑纳米线（NT）（1D）和纳米板（NP）（2D）结构，并使用分子动力学模拟来评估其连接性对玻璃-晶体复合材料中热导率的作用，作为α石英区域体积分数的函数。还研究了热导率的方向依赖性以获得沿沿着横截面方向的渗流阈值行为，而并联电路模型可以用于解释热导率沿着纵向的变化。将α-石英NT或NP结合到二氧化硅玻璃中提供了增强其热导率的机会。
The heat dissipation of silicate glasses draws much attention for various applications, and the desire for glasses with high thermal conductivity remains an unsolved challenge. The structural origin of thermal conductivity in glass remains not fully understood. The present study aims to elucidate the impact of embedding highly thermally conductive crystalline α‐quartz in a silica glass matrix. We consider both nano‐thread (NT) (1D) and nano‐plate (NP) (2D) structures and use molecular dynamics simulations to evaluate the role of its connectivity on thermal conductivity in the glass–crystal composite as a function of the volume fraction of the α‐quartz region. The directional dependence of thermal conductivity was also investigated to obtain percolation threshold behavior along the cross‐sectional directions, whereas the parallel circuit model of electricity can be used to account for the change of thermal conductivity along the longitudinal direction. Incorporation of α‐quartz NTs or NPs into silica glass offers the opportunity to enhance its thermal conductivity.