储能科学与技术2024，Vol.13Issue(6)：1786-1793,8.DOI:10.19799/j.cnki.2095-4239.2024.0022
改性氧化铜/正十八烷复合相变材料制备及性能表征研究
Preparation and characterization of modified CuO nanoparticles/n-octadecane phase change material
摘要
Abstract
To enhance the stability and thermophysical properties of composite phase change materials(CPCM),sodium oleate(SOA)was employed to modify CuO nanoparticles,integrating them with n-octadecane to formulate PCMs at varying modified nanoparticle(M-CuO)concentrations.The experimental outcomes indicated a significant increase in the thermal conductivity of CPCM containing 3.0%M-CuO—up to 282.9%compared to pure n-octadecane.Additionally,the melting enthalpy decreased by as much as 6.3%with an M-CuO content of 2.0%.To further enhance the dispersion stability of the nanoparticles,sodium oleate was incorporated as a surfactant,resulting in a thermal conductivity increment of 10.4%for the CPCM compared to those without the surfactant.Molecular dynamics modeling of M-CuO/n-octadecane CPCM revealed that the thermal conductivity was enhanced by 8.6%,10.4%,and 11.2%at nanoparticle distances of 20 Å,30 Å,and 40 Å,respectively.Moreover,the interaction energies between M-CuO nanoparticles were reduced by 22.9,16.3,and 20.0 kcal/mol,respectively,indicating a reduction in interaction energy and an enhancement in their stability.This study provides critical theoretical insights into the thermophysical property enhancement and optimization of CPCM,uncovering the fundamental microscopic mechanisms involved.关键词
相变材料/改性纳米颗粒/分子动力学/导热系数/熔化焓Key words
phase change materials/modified nanoparticles/molecular dynamics/thermal conductivity/melting enthalpy分类
能源科技引用本文复制引用
赵晨阳,于晓琨,陶于兵..改性氧化铜/正十八烷复合相变材料制备及性能表征研究[J].储能科学与技术,2024,13(6):1786-1793,8.基金项目
国家自然科学基金(U22A20212). （U22A20212）
