Robust, double-layered phase-changing microcapsules with superior solar-thermal conversion capability and extremely high energy storage density for efficient solar energy storage

Yuan, Shunpan; Yan, Rui; Ren, Bibo; Du, Zongliang; Cheng, Xu; Du, Xiaosheng; Wang, Haibo

doi:10.1016/j.renene.2021.08.128

Cited by 35 publications

(12 citation statements)

References 46 publications

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“…The crystalline structure of PCMCs and the phase change core counterparts were evaluated by XRD (Figure d–f). ,, The PCMCs with paraffin as the phase change core and pristine paraffin show nearly same diffraction peaks at 2θ = 21.58 and 23.92°, corresponding to the interplanar crystal spacing ( d -spacing) of 4.11 and 3.72 Å, respectively (Figure d,e and Table S10 in the Supporting Inform). It indicates that the microcapsulation has no effect on the crystalline type of paraffin.…”

Section: Resultsmentioning

confidence: 99%

“…The thermal reliability of PCMCs was verified by comparing DSC curves (Figure 3h and Figures S16 and S17 in the Supporting Information) and XRD spectra (Figure 3i and Figures S18 and S19 in the Supporting Information) before and after 50 thermal cycles as well as shape stability (Figures S20−S22 in the Supporting Information) after thermal cycling with the previous literature. 1,9,30,35,39 The melting and freezing latent heat density (ΔH f ≈ΔH m ) of PCMCs are the almost same before and after thermal cycling, indicating that PCMCs exhibit an efficient reversible phase change process (Figure 3h and Figures S16 and S17 in the Supporting Information). The DSC curves of PCMCs with phase change cores not higher than 50 wt % before and after thermal cycling are basically consistent, and the changes of ΔH f and ΔH m are less than 14.6%, while PCMC-60%P-5%AA-OP had a little high change of ΔH f , reaching 26.8%, probably due to the thinning PS shell.…”

Section: ■ Introductionmentioning

confidence: 97%

“…Among them, polystyrene (PS), poly(methyl methacrylate) (PMMA), melamine formaldehyde resin, silica (SiO 2 ), and ferric oxide (Fe 3 O 4 ) are all common microcapsule shell materials. After coating with the shell material, the overall performance of PCMs can be effectively improved due to the zero-dimensional nature and the essence of the core–shell structure. − Generalized microcapsules can be divided into microcapsules (1–100 μm), sub-microcapsules (100–1000 nm), and nanocapsules (1–100 nm) according to the particle size. Usually, microcapsules can be prepared by simple methods including interface polymerization, suspension-like polymerization, and in situ polymerization without ultrasonic treatment and high-speeding (>1000 rpm) homogenization. − The intrinsic nature of the large particle size (usually 50–100 μm) for microcapsules leads to the low thermal conductivity, the gravity effect when being composited with polymer substrates, the difficulty of further functionalization, and so forth .…”

Section: Introductionmentioning

confidence: 99%

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Robust, Versatile Access to Quasi-Monodispersed Phase Change Sub-Microcapsules via Ab Initio Emulsion Polymerization

Ding

Liu

Zhao

et al. 2023

ACS Sustainable Chem. Eng.

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The phase change sub-microcapsules (PCMCs) with the particle size of 100 nm to 1 μm have a great application potential in the field of hybrid materials for solar energy storage, while the preparation of PCMCs remains challenging without ultrasonic treatment and high-speed (>1000 rpm) homogenization. Herein, PCMCs with readily tunable phase change properties are prepared via facile, robust ab initio emulsion polymerization. The PCMCs present the quasi-monodispersed particle morphologies with the tunable particle size from 159 to 383 nm depending on the loading content of acrylic acid and the free surfactant. The latent heat density and phase change temperature of the PCMCs can be tuned from 66.6 to 115.2 J/g and from 20.8 to 65.4 °C, respectively, depending on the loading content and the type of phase change cores. The PCMCs confirm the latent heat efficiency of about 1, the high thermal reliability, and the high shape stability. The PCMCs can be functionalized by polyaniline coatings with an efficient photothermal effect. The robust, versatile approach to functionalized PCMCs can provide an alternative opportunity for the development of the next-generation smart thermal energy materials.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Robust, Versatile Access to Quasi-Monodispersed Phase Change Sub-Microcapsules via Ab Initio Emulsion Polymerization

Ding

Liu

Zhao

et al. 2023

ACS Sustainable Chem. Eng.

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“…PCCs were synthesized using n‐octadecane as the core material and melamine‐formaldehyde polymer as the shell material via an in situ polymerization method according to the previous report with some modifications. [ 40 ] First, 14.13 g melamine powder, 23.30 g formaldehyde solution (37 wt%), and 50 mL deionized water were mixed in a three‐necked bottom flask equipped with a mechanical stirrer and condenser. The pH value of the reaction system was adjusted to 8.5 by TEA, and subsequently, the reaction was kept at 70 °C and stirred for 60 min to obtain the melamine‐formaldehyde prepolymer (MFP).…”

Section: Methodsmentioning

confidence: 99%

A Multifunctional Flexible Composite Film with Excellent Multi‐Source Driven Thermal Management, Electromagnetic Interference Shielding, and Fire Safety Performance, Inspired by a “Brick–Mortar” Sandwich Structure

Gong

Sheng

et al. 2022

Adv Funct Materials

215

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The rapid development of portable flexible electronic devices means a multifunctional composite film with excellent thermal management capability, high electromagnetic interference (EMI) shielding, and a strong fire safety performance is urgently required. In this paper, inspired by a "brick-mortar" sandwich structure, phase change capsules (PCCs) and MXene nanosheets are prepared. Subsequently, a one-step vacuum-assisted filtration method is used to fabricate a multifunctional flexible PCC/MXene/polyvinyl alcohol (PMP) phase change composite film with high light-to-thermal conversion efficiency, Joule heating generation, fire safety, and EMI shielding effects. The superior preparation technology endows the film with multi-source driven thermal management capabilities and excellent EMI shielding effectiveness values (43.13 dB). In addition, the PMP film exhibits good flexibility and high enthalpy (136.8 J g −1 ). Surprisingly, the PMP film's excellent fire safety properties improve its reliability and safety. In summary, the simple preparation technique and outstanding overall performance of the PMP films provide broad application prospects in advanced thermal management and EMI shielding in wearable products.

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“…Several carbon structures, including graphene, [32] carbon nanotubes, [33] graphite [34] have been investigated previously. In addition, some studies have used other photothermal dopants, such as polydopamine, [35] N719, [29] Fe 3 O 4 , [36] etc. So far the light‐to‐heat conversion efficiency of phase change materials or phase‐change microcapsules is improved to a certain extent by doping.…”

Section: Introductionmentioning

confidence: 99%

Construction of Excellent Visible Light Absorption Heat Storage Slurry Using Phase Change Microcapsules for Solar Thermal Utilization

et al. 2022

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Most solar thermal utilization materials can only absorb ultraviolet irradiation rather than visible-light, limiting the photothermal conversion efficiency of corresponding devices. In this work, a functional thermal slurry system with excellent visiblelight absorption and high photothermal conversion performance is developed based on the phase change microcapsules, incorporating the visible-light absorption antenna in the shell structure. Specifically, a phase change microcapsule with paraffin as the core material and silica as the wall material is prepared by the in-situ polymerization method, in which the shell layer is doped with various photosensitive molecules. The photothermal conversion efficiency of copper phthalocyanine and MXene can reach 98 % and 85.3 % respectively. The corresponding conversion efficiency could reach up to more than 80 % in a long temperature range. Therefore, the doping of photosensitive molecules with visible-light absorption can promote the solar energy conversion efficiency of these solar thermal utilization materials.

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Robust, double-layered phase-changing microcapsules with superior solar-thermal conversion capability and extremely high energy storage density for efficient solar energy storage

Cited by 35 publications

References 46 publications

Robust, Versatile Access to Quasi-Monodispersed Phase Change Sub-Microcapsules via Ab Initio Emulsion Polymerization

Robust, Versatile Access to Quasi-Monodispersed Phase Change Sub-Microcapsules via Ab Initio Emulsion Polymerization

A Multifunctional Flexible Composite Film with Excellent Multi‐Source Driven Thermal Management, Electromagnetic Interference Shielding, and Fire Safety Performance, Inspired by a “Brick–Mortar” Sandwich Structure

Construction of Excellent Visible Light Absorption Heat Storage Slurry Using Phase Change Microcapsules for Solar Thermal Utilization

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