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Lego-Microfluidics Generated Magnetically Responsive Bifunctional Microcapsules with Encapsulated Phase Change Material
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DOI：10.1021/acssuschemeng.4c00585.png)
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Abstract
En 中文
We report an innovative Lego-microfluidic technology for room temperature synthesis of highly monodispersed bifunctional microcapsules enclosing phase change material (PCM), exhibiting magnetic and thermal energy storage properties. Iron(II, III) oxide (Fe3O4) nanoparticle-embedded microcapsules encapsulating hexadecane (HD) are synthesized without external heating or cooling in just similar to 80 s. The process involves forming oil-in-oil-in-water (O/O/W) double emulsion droplets with Norland Optical Adhesive (NOA) photopolymeric shell and consolidating them through on-the-fly shell polymerization using thiol-ene click chemistry. PCM content and magnetic properties were accurately manipulated by adjusting inner phase (PCM) flow rate and mass fraction of Fe3O4 nanoparticles in the middle (polymer) phase. Microcapsules with a shell thickness of 17.1 mu m achieved a maximum PCM content of 63.3%. Thermogravimetric analysis (TGA) revealed significantly enhanced thermal stability of Fe3O4 nanoparticle-embedded microcapsules compared to pure PCM. Vibrating sample magnetometry (VSM) verified an increase in saturation magnetization and residual magnetization of microcapsules, having higher Fe3O4 nanoparticle content. Notably, the sample containing 1% Fe3O4 nanoparticles exhibited excellent magnetic properties, showcasing a saturation magnetization of 0.194 emu/g. Concurrently, the PCM microcapsules demonstrated high magnetic responsiveness and maneuverability.
Keywords:
phase change material
microfluidics
microencapsulation
microcapsules
magnetoresponsive
thermal energystorage
Journal
IF:
7.3
Papers:
1.7W
Citations:
10.7W
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