Phase change material microcapsules with melamine resin shell via cellulose nanocrystal stabilized Pickering emulsion in-situ polymerization

Zhang, Zhe; Zhang, Zhen; Tian, Canrong; Juan, Wang; Wang, Xin; Zhou, Guofu

doi:10.1016/j.cej.2021.131164

Cited by 169 publications

(52 citation statements)

References 62 publications

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“…The enthalpy of the PW@H-KAF increased with the decreases of the concentration of the KNF dispersion, as well (Figure f). For the phase-change fiber prepared with 2.5 wt % KNF dispersion (PW@2.5%H-KAF), the enthalpy can go up to 172 J/g, which is higher than that other phase-change packaging materials reported previously (Figure g) − and much higher than commercial outlast fibers with enthalpy of about 3.72 J/g (Figure S10). It is worth mentioning that the enthalpy of PW@2.5%H-KAF (172 J/g) is higher than that of PW@2.5%KAF (167.8 J/g), which is attributed to the grafted alkanes enhancing the affinity between KNFs and paraffin wax (Figure S11).…”

Section: Resultsmentioning

confidence: 70%

“…TG curves (e) and DSC curves (f) of the Kevlar aerogel-confined paraffin fibers prepared with different concentration of KNF dispersion, at the concentration of 2.5, 8, and 10 wt % (PW@2.5%H-KAF, PW@8%H-KAF, and PW@10%H-KAF), respectively. (g) Comparison of thermal energy storage behaviors of our PW@H-KAF with those in literature. − (h) Temperature–time curves of 10 cycles test. (i) Stress–strain curves of the PW@2.5%H-KAF, PW@8%H-KAF, and PW@10%H-KAF.…”

Section: Resultsmentioning

confidence: 95%

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Bending Stiffness-Directed Fabricating of Kevlar Aerogel-Confined Organic Phase-Change Fibers

et al. 2021

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Smart and functional fibers have demonstrated great potentials in a wide range of applications including wearable devices and other high-tech fields, but design and fabrication of smart fibers with manageable structures as well as versatile functions are still a great challenge. Herein, an ingenious bending-stiffness-directed strategy is developed to fabricate smart phase-change fibers with different bending stiffnesses for diverse applications. Specifically, the hydrophobic Kevlar aerogel-confined paraffin wax fibers (PW@H-KAF) are fabricated by employing hydrophobic Kevlar aerogel fibers (H-KAFs) as the porous host and paraffin as the functional guest, where the H-KAF is obtained by applying a two-step process to functionalize Kevlar nanofibers (KNFs) with a special coagulation bath containing a mixture of ethanol and n-bromobutane. The prepared PW@H-KAFs exhibit high latent heat (135.1–172 J/g), outstanding thermal cyclic stability and satisfactory mechanical properties (30 MPa in tensile strength and 30% in tensile strain). In addition, the PW@H-KAFs with bending stiffness was lower than the critical one (1.22 × 10–9 N·m2) even in a solid state of paraffin wax exhibits high flexibility, washable performance, and high thermal management capability, showing great potential for smart temperature-regulating fabrics. PW@H-KAFs with a bending stiffness higher than the critical one at a solid state of paraffin wax can be utilized as shape memory materials, attributed to the transition between rigidity and flexibility caused by the phase transition. As a proof of concept, a dynamic gripper is designed based on the PW@H-KAF (400 μm in diameter) for transporting items by gripping in the rigid state and releasing in the flexible state. This work realizes versatile applications with the PW@H-KAFs through the bending stiffness-directed method, providing ideas for the application of phase-change composites.

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Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 95%

Bending Stiffness-Directed Fabricating of Kevlar Aerogel-Confined Organic Phase-Change Fibers

et al. 2021

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“…However, two crystallization peaks in the exothermal curve of the capsules were observed, which also was reported in the literature. [37] One possible reason for two crystallization peaks might be some of n-octadecane had not been encapsulated. The leakage test of the encapsulated n-octadecane was checked.…”

Section: Thermal Performance Of Pcm Capsulesmentioning

confidence: 99%

Encapsulation of Phase Change Materials via Interfacial Miniemulsion Polymerization for High Thermal Energy Storage Density

Zhao

Luo

2022

Macro Reaction Engineering

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Phase change material (PCM) capsules have potential applications as a thermal management material in energy-efficient buildings. It is desirable for PCM capsules to have high core-loading and sub-micrometer particle size. Herein, it is reported that interfacial reversible addition-fragmentation chain transfer (RAFT) miniemulsion polymerization can be a convenient method to synthesize high PCM loading polymeric capsule latex. It is found that increasing particle size should be helpful to obtain well-defined capsules of high PCM loading but post-addition of surfactant should be carried out to remain the colloidal stability during polymerization. In the case of high PCM loading, a limiting conversion is observed. Increasing crosslinker (DVB) level up to 20 wt% based on monomers can increase the limiting conversion up to 94%. The well-defined paraffin capsules of 365 nm in diameter is synthesized with 67 wt% PCM loading. The paraffin capsules have a crystallization/melting heat around 105 J g −1 . Replacing paraffin with pure n-octadecane, the crystallization/melting heat is increased up to 144 J g −1 .

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“…Interestingly, Pickering emulsion is a green emulsion stabilized by solid particles, showing partial wettability with both oil and water phases. 28,29 In the emulsion, solid particles irreversibly adsorb onto the oil-water interfaces and PCM microcapsules. Pickering emulsion technology has become a convenient method for improving shape-ability, efficiency, and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

A flexible phase change organohydrogel created using Pickering emulsion technology for thermoelectric conversion and temperature sensing

Yuan

Qian

et al. 2022

J. Mater. Chem. A

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Phase change material microcapsules with melamine resin shell via cellulose nanocrystal stabilized Pickering emulsion in-situ polymerization

Cited by 169 publications

References 62 publications

Bending Stiffness-Directed Fabricating of Kevlar Aerogel-Confined Organic Phase-Change Fibers

Bending Stiffness-Directed Fabricating of Kevlar Aerogel-Confined Organic Phase-Change Fibers

Encapsulation of Phase Change Materials via Interfacial Miniemulsion Polymerization for High Thermal Energy Storage Density

A flexible phase change organohydrogel created using Pickering emulsion technology for thermoelectric conversion and temperature sensing

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