Micro- and nano-encapsulated metal and alloy-based phase-change materials for thermal energy storage

Zhu, Shilei; Nguyen, Mai Thanh; Yonezawa, Tetsu

doi:10.1039/d0na01008a

Cited by 34 publications

(8 citation statements)

References 109 publications

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“…Inorganic PCMs have advantages of large phase-change latent heat and non-flammability . However, two major problems of supercooling and phase separation limit their applications . Organic PCMs have thereby gained widespread attention due to their low supercooling, high chemical stability, and non-corrosiveness.…”

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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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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“…Liu et al 26 provided a detailed review of the numerous ways for microencapsulating PCMs with a wide temperature range in a variety of organic and inorganic shell materials. Zhu et al 27 focused on a review of micro‐ and nano‐encapsulation of metal and alloy PCMs with low‐ to high‐melting temperature.…”

Section: Introductionmentioning

confidence: 99%

The microencapsulation, thermal enhancement, and applications of medium and high‐melting temperature phase change materials: A review

Sinaga

Darkwa

Omer

et al. 2022

Intl J of Energy Research

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Summary Microencapsulated phase change materials (MEPCMs) have made tremendous advancements in recent years, owing to their increased demand for a variety of energy storage applications. In this paper, current microencapsulation techniques, enhancement, and use of medium‐ and high‐melting phase change materials (PCMs) are reviewed, as well as their potential benefits and limitations. The most frequently employed PCMs for medium‐ and high‐temperature applications were recognized as salt‐based, metallic, inorganic compound, and eutectic. Meanwhile, polymethyl methacrylate (PMMA), polystyrene‐butylacrylate (PSBA), polyethyl‐2‐cyanoacrylate (PECA), and polyurethane were widely used as polymer shell materials for encapsulating medium‐ and high‐melting point PCMs via chemical method, whereas inorganic silica shell was synthesized via various techniques. Hydrolysis followed by heat‐oxidation treatment has been extensively studied since 2015 to encapsulate either metal or alloy within Al2O3 shells. Different techniques were developed to generate void between core and shell material to accommodate volume expansion during phase transition. Numerous approaches, including the incorporation of metal particles, carbon, and ceramic, have been found as ways to enhance the thermal performance of PCMs. Multiple storage arrangements were also established to be an effective way of enhancing the overall efficiency of medium‐high melting PCM storage systems. Finally, the paper highlights the potential of medium‐ and high‐melting temperature PCMs for solar power generation, solar cooking, and industrial waste heat recovering applications.

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“…The organic PCMs are represented by paraffins, fatty acids, esters and polymers, which have the characteristics of high latent heat per unit mass, low thermal conductivity, and large volume change between solid and liquid states, while the inorganic PCMs mainly include molten salts, hydrated salts and metal. 1,2 Metal PCMs have attracted much attention in recent years, due to their outstanding advantages in high thermal conductivity, high latent heat per unit volume and small volume change before and aer phase change. 2,3 In particular, the value of low melting point metal or so called "liquid metal" represented by gallium in passive thermal management has long been reported, 4,5 and some recent studies also demonstrated its potential in thermoregulation and aerospace.…”

Section: Introductionmentioning

confidence: 99%

“…1,2 Metal PCMs have attracted much attention in recent years, due to their outstanding advantages in high thermal conductivity, high latent heat per unit volume and small volume change before and aer phase change. 2,3 In particular, the value of low melting point metal or so called "liquid metal" represented by gallium in passive thermal management has long been reported, 4,5 and some recent studies also demonstrated its potential in thermoregulation and aerospace. 6,7 The advantages and disadvantages of the above PCMs are very clear.…”

Section: Introductionmentioning

confidence: 99%

Phase change composites of octadecane and gallium with expanded graphite as a carrier

2022

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Micro- and nano-encapsulated metal and alloy-based phase-change materials for thermal energy storage

Abstract: A new class of phase change materials based on encapsulated metal and alloy micro- and nano-particles with advanced thermophysical properties for cyclable and stable thermal energy storage/release is highlighted.

Cited by 34 publications

References 109 publications

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

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

The microencapsulation, thermal enhancement, and applications of medium and high‐melting temperature phase change materials: A review

Phase change composites of octadecane and gallium with expanded graphite as a carrier

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