Production of thermoregulating slurries constituted by nanocapsules from melamine-formaldehyde containing n-octadecane

Jiménez-Vázquez, Macarena; Ramos, F. Javier; Garrido, Ignacio; López-Pedrajas, Daniel; Rodrı́guez, Juan F.; Carmona, Manuel

doi:10.1016/j.est.2022.104465

Cited by 10 publications

(5 citation statements)

References 27 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%

“…The theoretical PCM loadings (E theo ) were computed using eq 6. 28,29 The enthalpies of pure and encapsulated PCM were used to compute the experimental PCM loading (E exp ) using eq 7: where ΔH m,ePCM and ΔH m,PCM represent melting (crystallizing) enthalpies of encapsulated and pure PCM, respectively. In Figure 5, the thermogram of pure HD reveals an excellent melting enthalpy of 240 J/g at a temperature of 18.9 °C, thereby approving the excellent phase change characteristics of HD.…”

Section: Confirmation Of Fe 3 Omentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Confirmation Of Fe 3 Omentioning

confidence: 99%

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

Parvate,

Moshtaghibana,

Solanke

et al. 2024

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…The 2θ angles at 7.74°, 11.49°, 15.45°, and 39.67°correspond to the planes (002), ( 003), (004), and (022) of the α-form crystal. 38,39 These sharp diffraction peaks indicate the high degree of crystallinity of noctadecane, which is associated with its substantial thermal storage capacity. For NE-PCMs, the absence of characteristic peaks in the NE-PCM0 diffraction pattern signifies the amorphous state of the shell material.…”

Section: Resultsmentioning

confidence: 99%

Phase Change Nanocapsules Enabling Dual-Mode Thermal Management for Fast-Charging Lithium-Ion Batteries

Geng,

Wang,

Chen

et al. 2024

ACS Nano

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The fast-charging performance of conventional lithium-ion batteries (LIBs) is determined by the working temperature. LIBs may fail to work under harsh conditions, especially in the low-temperature range of the local environment or in the high-temperature circumstances resulting from the release of substantial Joule heating in the short term. Constructing a thermal engineering framework for thermal regulation and maintaining the battery running at an appropriate temperature range are feasible strategies for developing temperature-tolerant, fast-charging LIBs. In this work, we prepare phase change nanocapsules as a thermal regulating layer on the cell surface. The polyurea shells of the nanocapsules are decorated with polyaniline, where the molecular vibration of polyaniline is enhanced under solar irradiation, enabling light-to-heat conversion that achieves an effective temperature increment at low temperatures. Based on the large latent heat storage capability of the n-octadecane core in the nanocapsules, the thermal regulating layer is sufficient to modulate strong heat release when operating LIBs at a high current rate, which efficiently prevents strong side reactions at high temperatures or even the occurrence of thermal runaway. This work highlights the promise of optimizing the operating temperature with a thermal regulator to ensure the safety and performance stability of fast-charging LIBs.

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“…These PCSs are often made by redisposing PCM capsules in a solvent other than the reaction medium where the encapsulated PCM was synthesized. This process involves procedures like capsule drying and washing prior to the PCS synthesis [78]. The primary element of the free cooling system is PCM storage; hence care should be paid when choosing PCM and PCM melting point.…”

Section: Pcm Encapsulation Types Classified According To Their Sizementioning

confidence: 99%

A state-of-the-art review on advancements in phase change material encapsulation techniques for electronics cooling

Venkatakrishnan,

Palanisamy

2023

Phys. Scr.

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The continuous rise and reduction in heat flow of electronic devices constitute significant challenges for cooling management. The shell materials thermal conductivity affects both heat transfer and PCM - heat transfer fluid interaction (HTF). As a result, the traditional techniques of cooling systems are insufficient to provide the necessary cooling for such heat-generating electronic gadgets. In this view, there has been a considerable amount of effort applied into the development of high-efficiency cooling for electronics cooling applications. Today, many scientific studies are focusing on the usage of phase change materials (PCM) in high-energy storage systems due to their excellent thermal storage properties. Since the PCM and its volume of energy storage decrease from core to the coating, the higher encapsulation thickness provides minimum quality when compared to the lower thickness of encapsulation This review highlights the importance of size, thickness, and core-to-coating ratios while offering a thorough overview of PCM encapsulation methods for electronics cooling. It presents the novel idea of carbon nanotube-enhanced PCMs, emphasizes the need of choosing the right shell material, and investigates the effects of encapsulation shape. The key characteristics of encapsulation, such as influence of shell material, encapsulation shape, melting and solidification are reviewed.

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Production of thermoregulating slurries constituted by nanocapsules from melamine-formaldehyde containing n-octadecane

Cited by 10 publications

References 27 publications

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

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

Phase Change Nanocapsules Enabling Dual-Mode Thermal Management for Fast-Charging Lithium-Ion Batteries

A state-of-the-art review on advancements in phase change material encapsulation techniques for electronics cooling

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