Progress in Natural Science-Materials International
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2021
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IF 3.607
Pan Zhang,Zefeng Cheng,Zhang Chen,Yanfeng Gao
Liquid-solid phase change materials (PCMs) show reversible storage and release of latent heat, which has attracted extensive interests in applications for thermal energy storage. However, stubborn leakage issue may cause corrosion and extra thermal resistance. The non-wettability of melted paraffin on the oleophobic surface of diatomite has been reported by authors earlier, and the result showed that the encapsulation ratio (84.5%) of diatomite@paraffin shape-stabilized PCM greatly increased. Here, in order to prove this method equally applicable to other PCMs and porous natural clay minerals, diatomite and sepiolite were oleophobically modified to encapsulate melted stearic acid and paraffin, to form shape-stabilized PCMs. The results showed that the encapsulation ratios of 67.8% and 56.6% for diatomite@stearic acid and sepiolite@paraffin were higher than that reported in the references (28.9% and 36.8%). In addition, the encapsulation ratios of diatomite-based shape-stabilized PCMs can be also increased using different PCMs, such as n -octadecane and polyethylene glycol via the same approach. Therefore, this is a universal method for improving encapsulation ratios of shape-stabilized PCMs.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
Journal of Energy Storage
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2023
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IF 9.4
Liyu Zhang,Xuelai Zhang,Weisan Hua,Zhibo Chen
Phase change microcapsules (MPCM) have significant advantages, such as fast thermal response and low leakage rate, which can be widely used in construction, textile, and electric power fields. However, the existing microcapsule preparation process has high costs and complicated steps, which limits its popularization and application. This paper reports a de-organic reform of the in-situ polymerization method for the fabrication of MPCM. The aqueous phase (solvent) consisted of pure deionized water and surfactant instead of conventional partial or pure organic solvents such as ethanol and acetamide. Taking the type and content of surfactant, homogenization speed, solvent ratio and core-shell ratio as the research variables, the optimal fabrication scheme of silicon-based MPCM in an alkaline environment was confirmed. The results showed that the Pa@SiO 2 microcapsules prepared by pure inorganic solvents had great shape stability to prevent phase change material leakage and great temperature regulation performance when appropriate amount of hexadecyl trimethyl ammonium bromide was the surfactant and 3-Aminopropyltriethoxysilane was the silane coupling agent . More importantly, it has high heat storage capacity of 191.5 J/g due to its excellent encapsulation ratio of 76.4 %. Therefore, the fabrication method without organic solvent can simplify the fabrication process and greatly reduce the fabrication cost while ensuring excellent thermal properties of microcapsules, especially the outstanding heat storage capacity, which shows great application prospects in terms of microcapsule large-scale production.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2025
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IF 6.3
Ruishuo Guo,Huijia Wang,Qingwen Wen,Xin Xu,Yanlan Zhou,Xiaoqiang Shao,Ni Li
Phase change capsules effectively address the limitations of leakage and poor stability of phase change materials (PCMs). In this study, SiO 2 @n-Octadecane phase change nanocapsules (PCNCs) with controllable size and structure are prepared by controlling material ratios. When Water-to-EtOH ratio is 2:1 and C 18 -to-TEOS ratio is 3:3 in the reaction system, prepared PCNCs show excellent phase change enthalpy of 152.9 J/g and high encapsulation ratio of 73.77 %, with desirable thermal stability and reliability. After the irradiation of simulating sunlight for 1500 s, the PCNCs achieved a temperature buffer of 6 °C compared with blank cotton fabric, and the cotton fabric with the PU coating containing the PCNCs presents up to 13.2 °C temperature reduction compared with original cotton fabric. The prepared SiO 2 @n-Octadecane PCNCs present excellent heat storage and thermal management performance and effective strategy to develop long-term thermal comfort smart textiles.
研究领域:
材料科学
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纳米技术
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热工工程
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智能纺织
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产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2023
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IF 8.7
Keyang Zheng,Hongqiang Li,Junhuang Xu,Xuejun Lai,Zhonghua Chen,Xingrong Zeng
Phase change materials (PCMs) are highly promising materials in the field of energy harvesting. However, most of them lack flexibility and visualization function. Herein, a flexible phase change organogel (PCOG) was prepared via one-step in-situ polymerization reaction for the construction of three-dimensional network to “lock” n-dodecanol as PCM. The PCOG demonstrated excellent flexibility, high latent heat of 121.7 J/g and encapsulation rate of 60.6%, and also exhibited excellent cycling stability. The transmittance of the PCOG increased from 15% to 85% with the phase change process, displaying the visualization function. Furthermore, the PCOG also showed superior adhesion performance on different substrates. The generated electrical potential of a commercial thermoelectric generator adhered by the PCOG was 3 times higher than that without PCOG using human body as thermal source. Our findings provided a new strategy to prepare functional composite PCMs and the PCOG showed great potential in energy harvesting, storage and utilization.
研究领域:
材料科学
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能量收集
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热管理
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产品关联
DOI
高影响因子
Journal of Cleaner Production
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2024
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IF 9.7
Zeyang Kang,Jiahao Zhao,Zhenhui Chen,Xiangyang Liu,Maogang He
A novel phase change microcapsule has been developed and synthesized for solar energy storage systems . The fabrication process involved the in-situ polymerization of phase change microcapsules, wherein cellulose nanocrystals (CNCs) were employed as Pickering emulsifiers and nano-fillers to enhance the properties of the melamine formaldehyde resin (MF) shells. These enhancements included improved emulsifying ability, mechanical strength , and sustainability. Subsequently, black phosphorus (BP), a two-dimensional material with high solar absorption intensity and a wide frequency range, was covalently modified by MF to enhance the photothermal capacity of the microcapsules and reduce the thermal resistance between the photothermal material and the phase change material (PCM), this functionalized BP was referred to as MF@BP. The phase change microcapsules without and with MF@BP exhibit high latent heat values of 210.79 J g −1 and 207.92 J g −1 , respectively. Furthermore, the PCM core content was measured at 88.9% and 88.5%, and the encapsulation rates are 99.0% and 98.8%, respectively. The PCM microcapsules with MF@BP demonstrated excellent photothermal characteristics with an efficiency of 92.04%. Additionally, the PCM microcapsules exhibit stability below 200 °C and retain 99.4% of their latent heat even after 100 cycles of heating and cooling. Furthermore, the PCM microcapsules display self-extinguishing properties due to the flame retardancy of the MF shell, and the incorporation of black phosphorus further enhanced the flame retardancy. Overall, these PCM microcapsules exhibit significant potential for utilization in solar energy systems .
研究领域:
材料科学
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能源存储
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纳米技术
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太阳能
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产品关联
DOI
高影响因子
Polymer Chemistry
·
2023
·Vol. 15
·期 4
·276-291
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IF 4.6
Yu Fan,Yanyun Li,Xinyuan Tang,Junying Zhang,Jue Cheng,Qingsong Lian
High encapsulation rates resulting from excellent compatibility between encapsulated solid–liquid phase change materials (SLPCMs) and cross-linking networks usually lead to high enthalpy loss for polymeric form-stable phase change materials (FSPCMs). Besides, the traditional thermal curing process for preparing polymeric FSPCMs requires a long time and causes much energy consumption. Therefore, the integration of a high encapsulation rate, low enthalpy loss, and an efficient photocuring strategy for designing polymeric FSPCMs is still a challenge. In this work, a series of fast ultraviolet (UV) curable and adjustable comb/bottlebrush epoxy/paraffin FSPCMs with high encapsulation rates and low enthalpy loss were designed and highly efficiently prepared through the chain extension reaction of epoxy resin and octadecylamine (ODA) followed by a photoinitiated thiol–ene click curing reaction. By adjusting the physical entanglement of the molecular chains, compatibility between the 3D cross-linking network and paraffin, and chemical cross-linking density, a high encapsulation rate of paraffin (60 wt%) and ultralow enthalpy loss (0.7%) can be achieved in only 13 min of the photocuring process, and the enthalpy value of the FSPCMs can reach 150.1 J g−1. The effects of the molecular weight, grafting density, and cross-linking density on the phase change properties were systematically discussed. Subsequently, through the introduction of Diels–Alder (D–A) bonds, the recycling and self-healing ability of the epoxy/paraffin FSPCMs was further achieved. This paper not only provides a strategy for preparing polymeric FSPCMs by the fast photocuring process but also can provide theoretical guidance for the optimization of the preparation of self-healing polymeric FSPCMs with high encapsulation rates and ultralow enthalpy loss.
研究领域:
材料科学
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聚合物化学
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相变材料
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能量存储
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可持续材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）