Low thermal conductivity PW/CuWO4 phase change microcapsules with fluorescent properties for enhanced thermal management and visual detection in coating applications

被引:0
作者
Cheng, Han [1 ]
Tang, Bo [1 ]
机构
[1] Changzhou Univ, Dept 21 Gehu Rd, Changzhou 213164, Peoples R China
关键词
Paraffin; Copper tungstate; Phase change microcapsules; Versatility; Thermal insulation coatings; ENERGY STORAGE; FABRICATION; PARAFFIN; DESIGN; SHELL;
D O I
10.1016/j.est.2025.116079
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The low thermal conductivity paraffin (PW) phase change materials (PCMs) coating with the copper tungstate (CuWO4) as the shell material are fabricated. Compared with the most phase change microcapsules (NePCMs) with the single function of heat storage, the as-prepared multifunctional microcapsules possess high stability, UV absorption, and photoluminescent properties. A three-factor, four-level orthogonal experimental method was employed to determine the optimal stirring speed, emulsifier content, and core/shell ratio for the samples. The maximum phase transformation enthalpy (Delta Hm) reaches 132.09 J g-1 and the encapsulation rate (ER) is 72.96 % when the core to shell ratio, the percentage of sodium dodecylsulfonate (SDS) and the stirring rate is 1:1, 0.29 % and 800 rpm, respectively. The obtained NePCM exhibited a regular spherical shape and an intact core-shell structure, and the average size of the microcapsules is about 560 nm. These microcapsules can be used to modify coatings, which show the low thermal conductivity, photoluminescence, and UV characteristics. According to the fluorescence spectroscopy test, the fluorescence quenching phenomenon will occur when the excess microcapsules is added to the coating. The increased proportion of microcapsules results in a better thermal insulation effect, but a deteriorate thermal conductivity.
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页数:12
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