Preparation and performance of magnetic phase change microcapsules with organic-inorganic double shell

Jiang, Zhuoni; Shu, Jingjing; Ge, Zhiqing; Jiang, Zhiwen; Wang, Mozhen; Ge, Xinlei

doi:10.1016/j.solmat.2022.111716

Cited by 33 publications

(15 citation statements)

References 45 publications

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“…Solar-thermal materials are capable of harnessing solar energy, which has been widely used in power generation, thermal energy storage, water purification, and sterilization systems over the past decades. , An ideal solar-thermal material should effectively absorb solar irradiation over the entire solar spectrum with high solar-thermal conversion efficiency. The solar-thermal effect produced by solar excitation exists in diverse kinds of nanostructured materials, such as carbon materials, metallic materials, semiconductors, and some conjugated polymers, etc. − Upon solar irradiation, these solar-thermal materials convert solar energy into thermal energy through different solar-thermal conversion mechanisms, which are related to their inherent electronic or bandgap structures. Generally, solar-thermal conversion mechanisms can be categorized into three categories, namely conjugate effect and hyperconjugate effect, surface plasmon resonance (SPR) effect, and localized SPR (LSPR) effect, and nonradiative relaxation effect. − …”

Section: Mechanismsmentioning

confidence: 99%

Phase Change Thermal Storage Materials for Interdisciplinary Applications

et al. 2023

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Functional phase change materials (PCMs) capable of reversibly storing and releasing tremendous thermal energy during the isothermal phase change process have recently received tremendous attention in interdisciplinary applications. The smart integration of PCMs with functional supporting materials enables multiple cutting-edge interdisciplinary applications, including optical, electrical, magnetic, acoustic, medical, mechanical, and catalytic disciplines etc. Herein, we systematically discuss thermal storage mechanism, thermal transfer mechanism, and energy conversion mechanism, and summarize the state-of-the-art advances in interdisciplinary applications of PCMs. In particular, the applications of PCMs in acoustic, mechanical, and catalytic disciplines are still in their infancy. Simultaneously, in-depth insights into the correlations between microscopic structures and thermophysical properties of composite PCMs are revealed. Finally, current challenges and future prospects are also highlighted according to the up-to-date interdisciplinary applications of PCMs. This review aims to arouse broad research interest in the interdisciplinary community and provide constructive references for exploring next generation advanced multifunctional PCMs for interdisciplinary applications, thereby facilitating their major breakthroughs in both fundamental researches and commercial applications.

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Section: Mechanismsmentioning

confidence: 99%

Phase Change Thermal Storage Materials for Interdisciplinary Applications

et al. 2023

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“…The microencapsulated PCMs with shell materials can effectively enhance the leakage-proof performance and heat-transfer area. − Shell material contributes significantly to the performance of microcapsules. , To satisfy different application requirements, various functional materials have been used to encapsulate PCMs, − including highly efficient photothermal conversion of the SiC/MUF composite shell, solar photocatalysis of the TiO 2 shell, and photoluminescence of the ZrO 2 shell . With the widespread use of nuclear technology, the frequency of human exposure to ionizing radiation has increased.…”

Section: Introductionmentioning

confidence: 99%

Flexible and Mechanically Enhanced Polyurethane Composite for γ-ray Shielding and Thermal Regulation

Cai

et al. 2023

ACS Appl. Mater. Interfaces

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Microencapsulation of paraffin with lead tungstate shell (Pn@PWO) shows the drawbacks of low wettability and poor leakage-proof property and thermal reliability, restricting the application of phase change microcapsules. Herein, a novel paraffin@lead tungstate@silicon dioxide double-shelled microcapsule (Pn@PWO@SiO 2 ) has been successfully constructed by the emulsion-templated interfacial polycondensation and applied in the waterborne polyurethane (WPU). The results indicated that a SiO 2 layer with controlled thickness was formed on the PbWO 4 shell. The Pn@PWO@SiO 2 microcapsules have exhibited superior leakage-proof properties and thermal reliability through doubleshelled protection, and the leakage rate decreased by at least 54.11% compared to that of Pn@PWO microcapsules. The SiO 2 layer with abundant polar groups ameliorated the wettability of microcapsules and the interfacial compatibility between microcapsules and the WPU matrix. The tensile strength of WPU/Pn@ PWO@SiO 2 -2 composites reached 10.98 MPa, which was over 7 times greater than that of WPU/Pn@PWO composites. In addition, WPU/Pn@PWO@SiO 2 -2 composites with a latent heat capacity of over 41 J/g exhibited efficient phase change stability and γ-ray shielding properties. Also, the mass attenuation coefficients reached 1.38 cm 2 /g at 105.3 keV and 1.12 cm 2 /g at 86.5 keV, respectively. These properties will greatly promote the application of WPU/Pn@PWO@SiO 2 composites into γ-ray-shielding devices with thermal regulation.

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“…15−17 However, these organic shells have some drawbacks, including high toxicity and low thermal conductivity. 18 Organic polymers, such as acrylic-based polymers, urea−formaldehyde resins, and melamine−formaldehyde resins, release toxic gases in applications. Further, the low thermal conductivity of organic material shells may directly affect the heat absorption or release efficiency of the microcapsules.…”

Section: Introductionmentioning

confidence: 99%

“…There are two types of shell materialsorganic and inorganic . Organic polymer materials, such as polystyrene, urea-formaldehyde resin, and polymethyl methacrylate, are widely used in reported phase-change microcapsules. − However, these organic shells have some drawbacks, including high toxicity and low thermal conductivity . Organic polymers, such as acrylic-based polymers, urea–formaldehyde resins, and melamine–formaldehyde resins, release toxic gases in applications.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence and Thermal Regulation Using Low-Supercooling Inorganic Microencapsulated Phase-Change Materials

Liu

Guo

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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High supercooling and single functionalization are the main barriers to the large-scale application of microencapsulated phase-change materials (PCMs) in the construction industry. To address these issues, we propose a new inorganic microencapsulated PCM, PW@CaWO 4 , which was synthesized via the in situ polymerization method using inorganic CaWO 4 as shell and phase-change paraffin wax (PW) as core. We investigated the effects of different emulsifiers and core-to-shell ratios on microcapsule properties and found that the PW@CaWO 4 microcapsules have regular spherical topography and good uniformity in particle size. During the synthesis process, the CaWO 4 shell provides convenient conditions for heterogeneous nucleation of PW and effectively reduces the supercooling degree. The minimum supercooling degree of the PW@CaWO 4 microcapsules is only 1.00 ± 0.08 °C, which is 3.41 °C lower than that of PW. Moreover, the PW@CaWO 4 microcapsules can absorb ultraviolet radiation and exhibit fluorescence, which originates from the peculiar WO 4 2− structure in the CaWO 4 shell, eliminating the need for doping other light-activating ions into the shell. The newly prepared microcapsules possess several advantages, including suitable particle size, low supercooling, good heat storage, high thermal conductivity, good short-wave ultraviolet absorption, peculiar fluorescence, excellent proof of leakage, and so on. The microcapsules can be applied to fluorescent architectural energy-saving coatings.

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Preparation and performance of magnetic phase change microcapsules with organic-inorganic double shell

Cited by 33 publications

References 45 publications

Phase Change Thermal Storage Materials for Interdisciplinary Applications

Phase Change Thermal Storage Materials for Interdisciplinary Applications

Flexible and Mechanically Enhanced Polyurethane Composite for γ-ray Shielding and Thermal Regulation

Fluorescence and Thermal Regulation Using Low-Supercooling Inorganic Microencapsulated Phase-Change Materials

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