Preparation and properties of nano phase change microcapsules for heat storage

被引：0
|
作者：
Huang Z. [1 ]
Sun Z. [1 ]
机构：
[1] School of Environment Science and Engineering, Suzhou University of Science and Technology, Jiangsu, Suzhou
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 11期
关键词：
enthalpy; n-docosane; nano microcapsules; phase change; stability; titanium dioxide;
D O I：
10.16085/j.issn.1000-6613.2022-2330
中图分类号：
学科分类号：
摘要：
Leakage prevention and thermal conductivity improvement of phase change materials are two key issues for energy storage of phase change materials. In this work, nano-TiO2@n-docosane microcapsules were prepared by fine emulsion interfacial polymerization using tetrabutyl titanate (TBT) as precursor. The formation process was observed by biomicroscopy, and the properties of nano-TiO2@ndocosane microcapsules were characterized by scanning electron microscope (SEM), differential scanning calorimeter (DSC), thermal conductivity meter and thermogravimetric analyzer. The experimental results showed that the formation process of nano-TiO2@n-docosane microcapsules was that the number of nano-microcapsules changed from less to more, the particle size from small to large, the interface of microscopic solution from blurred to clear, and the aging and cooling process of solution was gradually from gelation suspension state to powder precipitation state. The results of SEM test indicated that the particle size of nano-TiO2@n-docosane microcapsules was significantly related to rotational speed, and the appearance was closely related to the dosage of TBT, hydrochloric acid (HCl) and sodium dodecyl sulfate (SDS). The DSC results showed that the melting and solidification temperatures were 41.3℃ and 42.4℃, respectively. The latent heat of nano-TiO2@n-docosane was 178J/g. The coating rate and the coating efficiency were 70.7% and 69.0%, respectively with the heat storage capacity of 97.6%. The average thermal conductivity of nano-TiO2@n-docosane microcapsules was 215% of n-docosane. It was found from the infrared spectrum test that there was no chemical reaction when n-docosane and TiO2 were physically combined. The results of thermogravimetric analysis indicated that TiO2formed a physical protective barrier and slowed down the diffusion of n-docosane outside the capsule. © 2023 Chemical Industry Press. All rights reserved.
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页码：5842 / 5851
页数：9
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