Significant enhancement in local thermal conductivity of erythritol at interface with nanoparticles due to their interaction  

作　　者：Ning Cao Yanhui Feng Kening Yan Zihan Liu Jiawei Wan Lin Qiu 

机构地区：[1]School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]State Key Laboratory of Biochemical Engineering,Key Laboratory of Biopharmaceutical Preparation and Delivery,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Nano Research》2024年第8期7726-7736,共11页纳米研究（英文版）

基　　金：supported by the National Key R&D Program of China(No.2023YFF0612804);the National Natural Science Foundation of China(Nos.52222602,52236006,and 22293043);Beijing Nova Program(No.20220484170);the Fundamental Research Funds for the Central Universities(Nos.FRF-TP-22-001C1 and FRF-EYIT-23-05);Foundation of the Youth Innovation Promotion Association of CAS(No.2020048);IPE Project for Frontier Basic Research(No.QYJC-2023-08).

摘　　要：When nano-fillers are used to enhance the thermal conductivity of organic phase change materials(PCMs),the naturally formed interface is considered to hinder thermal transport of the composite PCMs.However,the effect of the interface on the thermal properties of surrounding PCM has not been fully studied.In this paper,three composite PCMs(Ery@SiC,Ery@SiO_(2) and Ery@Si_(3)N_(4))were prepared by melt-blending method.The local thermal conductivity and reduced Young’s modulus(E^(*))of the erythritol at the interface and far away from the interface in the composite PCMs were simultaneously measured by scanning thermal microscopy(SThM).The results revealed significant enhancement in local thermal conductivity of erythritol at the interface and its obvious positive correlation with E^(*).For different composite PCMs,molecular dynamics(MD)simulations suggested that the increase in intrinsic thermal conductivity and E^(*)of erythritol is attributed to the increase in interaction energy between erythritol and nanoparticles,as more erythritol phonon vibrations transform from localized mode to delocalized mode and erythritol has a higher density at the interface.These findings will provide new ideas for the design of PCM for energy storage.

关 键 词：scanning thermal microscopy phase change materials thermal conductivity reduced Young’s modulus interaction energy phonon participation ratio 

分 类 号：TB383[一般工业技术—材料科学与工程]