Phase-change material(PCM)is widely used in thermal management due to their unique thermal behavior.However,related research in thermal rectifier is mainly focused on exploring the principles at the fundamental device...Phase-change material(PCM)is widely used in thermal management due to their unique thermal behavior.However,related research in thermal rectifier is mainly focused on exploring the principles at the fundamental device level,which results in a gap to real applications.Here,we propose a controllable thermal rectification design towards building applications through the direct adhesion of composite thermal rectification material(TRM)based on PCM and reduced graphene oxide(rGO)aerogel to ordinary concrete walls(CWs).The design is evaluated in detail by combining experiments and finite element analysis.It is found that,TRM can regulate the temperature difference on both sides of the TRM/CWs system by thermal rectification.The difference in two directions reaches to 13.8 K at the heat flow of 80 W/m^(2).In addition,the larger the change of thermal conductivity before and after phase change of TRM is,the more effective it is for regulating temperature difference in two directions.The stated technology has a wide range of applications for the thermal energy control in buildings with specific temperature requirements.展开更多
Thermal rectification(TR)is a phenomenon akin to electrical rectification.It has a high thermal conductivity(k)in one direction,enabling efficient heat dissipation,as well as a low k in the opposite direction,impeding...Thermal rectification(TR)is a phenomenon akin to electrical rectification.It has a high thermal conductivity(k)in one direction,enabling efficient heat dissipation,as well as a low k in the opposite direction,impeding heat influx.With the rapid development of nanotechnology in recent years,the active control and regulation of heat conduction on the nanoscale has become a critical mission.Graphene,a prominent two-dimensional(2D)material,is highly regarded for its exceptional thermal transport characteristics.There have been studies and achievements both theoretically and experimentally since its discovery.In this review,we establish a bridge between fundamental research and application studies for graphene-based thermal rectifier as follows.Firstly,we summarize the established 2D heat conduction theories and low-dimensional simulation methods.Secondly,we review the progress of experimental techniques and device structures based on 2D theories for graphene-based thermal rectifier.Then,we discuss several applications of thermal rectifier,including thermal logic circuits and thermoelectric power generation system.Finally,we present the potential applications of graphene-based thermal rectifiers previously unexplored,such as microelectronic thermal management and thermal decoupling for flexible equipment.We hope that advancements in morphology and fabrication techniques will lead to widespread use of graphene-based thermal rectifiers in various thermal systems to solve diverse thermal management problems in the near future.展开更多
基金This work was supported in part by Tsinghua University-Zhuhai Huafa Industrial Share Company Joint Institute for Architecture Optoelectronic Technologies(JIAOT KF202204)in part by STI 2030—Major Projects under Grant 2022ZD0209200+2 种基金in part by National Natural Science Foundation of China under Grant 62374099,Grant 62022047in part by Beijing Natural Science-Xiaomi Innovation Joint Fund under Grant L233009in part by the Tsinghua-Toyota JointResearch Fund,in part by the Daikin-Tsinghua Union Program,in part sponsored by CIE-Tencent Robotics XRhino-Bird Focused Research Program.
文摘Phase-change material(PCM)is widely used in thermal management due to their unique thermal behavior.However,related research in thermal rectifier is mainly focused on exploring the principles at the fundamental device level,which results in a gap to real applications.Here,we propose a controllable thermal rectification design towards building applications through the direct adhesion of composite thermal rectification material(TRM)based on PCM and reduced graphene oxide(rGO)aerogel to ordinary concrete walls(CWs).The design is evaluated in detail by combining experiments and finite element analysis.It is found that,TRM can regulate the temperature difference on both sides of the TRM/CWs system by thermal rectification.The difference in two directions reaches to 13.8 K at the heat flow of 80 W/m^(2).In addition,the larger the change of thermal conductivity before and after phase change of TRM is,the more effective it is for regulating temperature difference in two directions.The stated technology has a wide range of applications for the thermal energy control in buildings with specific temperature requirements.
基金supported in part by STI 2030-Major Projects under Grant 2022ZD0209200in part by National Natural Science Foundation of China under Grant Nos.62374099+3 种基金in part by the Tsinghua-Toyota Joint Research Fund,in part by Beijing Natural Science Foundation-Xiaomi Innovation Joint Fund(L233009in part by the Daikin Tsinghua Union Program,in part supported by Tsinghua University-Zhuhai Huafa Industrial Share Company Joint Institute for Architecture Optoelectronic Technologies(JIAOT KF202204)in part by Independent Research Program of School of Integrated Circuits,Tsinghua UniversityThis work was also sponsored by CIE-Tencent Robotics X Rhino-Bird Focused Research Program.
文摘Thermal rectification(TR)is a phenomenon akin to electrical rectification.It has a high thermal conductivity(k)in one direction,enabling efficient heat dissipation,as well as a low k in the opposite direction,impeding heat influx.With the rapid development of nanotechnology in recent years,the active control and regulation of heat conduction on the nanoscale has become a critical mission.Graphene,a prominent two-dimensional(2D)material,is highly regarded for its exceptional thermal transport characteristics.There have been studies and achievements both theoretically and experimentally since its discovery.In this review,we establish a bridge between fundamental research and application studies for graphene-based thermal rectifier as follows.Firstly,we summarize the established 2D heat conduction theories and low-dimensional simulation methods.Secondly,we review the progress of experimental techniques and device structures based on 2D theories for graphene-based thermal rectifier.Then,we discuss several applications of thermal rectifier,including thermal logic circuits and thermoelectric power generation system.Finally,we present the potential applications of graphene-based thermal rectifiers previously unexplored,such as microelectronic thermal management and thermal decoupling for flexible equipment.We hope that advancements in morphology and fabrication techniques will lead to widespread use of graphene-based thermal rectifiers in various thermal systems to solve diverse thermal management problems in the near future.
