Influence of the dispersion characteristics for producing thermoregulating nano phase change slurries

López-Pedrajas, Daniel; Borreguero, Ana M.; Ramos, F. Javier; Rodrı́guez, Juan F.; Jiménez-Vázquez, Macarena; Carmona, Manuel

doi:10.1016/j.cej.2022.139034

Cited by 5 publications

(1 citation statement)

References 61 publications

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“…The phase change enthalpies Δ H m and Δ H c were determined by evaluating the areas between the peaks and the baseline during both heating and cooling phases of a DSC cycle, while the temperatures at which these phase changes occurred ( T m and T c ) were found based on the positions of these peaks. The theoretical PCM loadings ( E theo ) were computed using eq . , The enthalpies of pure and encapsulated PCM were used to compute the experimental PCM loading ( E exp ) using eq : E exp false( % false) = Δ H normalm , ePCM Δ H normalm , PCM × 100 where Δ H m,ePCM and Δ H m,PCM represent melting (crystallizing) enthalpies of encapsulated and pure PCM, respectively.…”

Section: Resultsmentioning

confidence: 99%

Lego-Microfluidics Generated Magnetically Responsive Bifunctional Microcapsules with Encapsulated Phase Change Material

Parvate,

Moshtaghibana,

Solanke

et al. 2024

ACS Sustainable Chem. Eng.

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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 (Fe 3 O 4 ) nanoparticle-embedded microcapsules encapsulating hexadecane (HD) are synthesized without external heating or cooling in just ∼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 Fe 3 O 4 nanoparticles in the middle (polymer) phase. Microcapsules with a shell thickness of 17.1 μm achieved a maximum PCM content of 63.3%. Thermogravimetric analysis (TGA) revealed significantly enhanced thermal stability of Fe 3 O 4 nanoparticle-embedded microcapsules compared to pure PCM. Vibrating sample magnetometry (VSM) verified an increase in saturation magnetization and residual magnetization of microcapsules, having higher Fe 3 O 4 nanoparticle content. Notably, the sample containing 1% Fe 3 O 4 nanoparticles exhibited excellent magnetic properties, showcasing a saturation magnetization of 0.194 emu/g. Concurrently, the PCM microcapsules demonstrated high magnetic responsiveness and maneuverability.

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