在石墨烯和WS2单层之间极端隔热和热传输机制的权衡2
Ruiling Zhang1,2, Lin Gan1, Danyang Zhang1,2
1Department of Electronic Engineering, Tsinghua University, Beijing, 100084, China.
Advanced materials (Deerfield Beach, Fla.)
|February 25, 2024
概括
研究人员通过控制二维 (2D) 层叠材料中的热流来设计了热绝缘. 他们发现,在特定的层间距离上,导热率最低,这对于纳米级热管理至关重要.
科学领域:
- 纳米级的传热方式
- 材料科学是一种材料科学.
- 热工程是指热工程的工程.
背景情况:
- 控制纳米级的热流对于基础科学和应用至关重要.
- 二维 (2D) 层叠材料为精确的热管理提供了潜力.
- 现有的2D异构结构由于近乎理想的层间接触而表现出强烈的声子主导热传输.
研究的目的:
- 通过变化的层间距离在二维分层材料中实验性研究热传输机制.
- 为了证明层间分离对WS2/石墨烯接口的导热率的影响.
- 为了确定在分层异构结构中实现最小导热率的最佳条件.
主要方法:
- 在WS2/石墨烯异构结构中,层间距离的系统变化,从直接接触到几纳米.
- 在工程界面上测量热导率的实验测量.
- 热传输机制的分析,区分声波主导和空气主导导.
主要成果:
- 通过WS2/石墨烯接口的phonon主导的导热率随着层间距离的增加而下降.
- 空气主导的导热率随着层间距离扩大到某一点以后,就会增加.
- 在2.11nm的层间距离下观察到1.41 × 10^-5 W m^-1 K^-1的最小导热率.
结论:
- 在声和空气主导的传热机制之间存在一个权衡.
- 2D材料中的工程层间距离提供了一种实现超低导热率的方法.
- 这项研究为设计纳米级的先进热绝缘提供了一条途径.
更多相关视频
相关概念视频
Conduction, Convection and Radiation: Problem Solving
1.2K
There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
1.2K
Thermal Insulation in Masonry Walls
124
In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
124
Semiconductors
701
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
701


