期刊
ACS APPLIED MATERIALS & INTERFACES
卷 15, 期 25, 页码 30383-30393出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.3c06063
关键词
phase-changemicrocapsules; active flow focusing; precise regulation; controlled latent heat; thermal management
Researchers have successfully developed highly controllable phase-change microcapsules that can precisely regulate temperature. The diameter of the microcapsules can be adjusted using a liquid-driven active flow focusing technique platform, and the shell thickness can be controlled by adjusting the monomer ratio. The fabricated microcapsules have uniform particle size, smooth surface, and compact structure, while exhibiting good phase-change performance and thermal stability.
Microencapsulationof phase-change materials (PCMs) is of greatvalue and significance for improving energy efficiency and reducingcarbon dioxide emissions. Here, highly controllable phase-change microcapsules(PCMCs) with hexadecane as the core material and polyurea as the shellmaterial were developed for precise temperature regulation. A universalliquid-driven active flow focusing technique platform was used toadjust the diameter of PCMCs, and the shell thickness can be controlledby adjusting the monomer ratio. In synchronized regime, the dropletsize is only related to the flow rate and excitation frequency, whichcan be accurately predicted by the scaling law. The fabricated PCMCshave uniform particle size with a coefficient of variation (CV) under2%, smooth surface, and compact structure. Meanwhile, under the goodprotection of a polyurea shell, PCMCs exhibit fair phase-change performance,strong heat storage capacity, and good thermal stability. The PCMCswith different sizes and wall thickness show obvious differencesin thermal properties. The feasibility of the fabricated hexadecanephase-change microcapsules in phase-change temperature regulationwas verified by thermal analysis. These features indicate that thedeveloped PCMCs by the active flow focusing technique platform havebroad application prospects in thermal energy storage and thermalmanagement.
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