Photothermal phase change material microcapsules via cellulose nanocrystal and graphene oxide co-stabilized Pickering emulsion for solar and thermal energy storage

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2024-08-12 DOI:10.1007/s40843-024-3040-5

Wang Sun (, ), Zhe Zhang (, ), Zhen Zhang (, ), Nisha He (, ), Qiang Wei (, ), Liu Feng (, ), Zhenghao Wang (, ), Jie Wu (, ), Can Liu (, ), Shiyu Fu (, ), Yelin Hou (, ), Gilles Sèbe, Guofu Zhou (, )

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Abstract

Phase change materials (PCMs) have attracted significant attention in thermal management due to their ability to store and release large amounts of heat during phase transitions. However, their widespread application is restricted by leakage issues. Encapsulating PCMs within polymeric microcapsules is a promising strategy to prevent leakage and increase heat transfer area with matrices. Moreover, photothermal PCM microcapsules are particularly desirable for solar energy storage. Herein, we fabricated photothermal PCM microcapsules with melamine-formaldehyde resin (MF) as shell using cellulose nanocrystal (CNC) and graphene oxide (GO) co-stabilized Pickering emulsion droplets as templates. CNC displays outstanding Pickering emulsifying ability and can facilitate the fixation of GO at the oil-water interface, resulting in a stable CNC/GO co-stabilized PCM Pickering emulsion. A polydopamine (PDA) layer was coated in-situ on the emulsion droplets via oxidization self-polymerization of dopamine. Meanwhile, GO was reduced to reduced GO (rGO) due to the reducing ability of PDA. The outmost MF shell of the PCM microcapsules was formed in-situ through the polymerization and crosslinking of MF prepolymer. The resulted PCM@CNC/rGO/PDA/MF microcapsules exhibit uniform sizes in the micrometer range, excellent leakage-proof performance, high phase change enthalpy (175.4 J g⁻¹) and PCM encapsulation content (84.2%). Moreover, the presence of rGO and PDA endows PCM@CNC/rGO/PDA/MF microcapsules with outstanding photothermal conversion performance. The temperature of PCM@CNC/rGO/PDA/MF microcapsule slurries (15wt.%) can reach 73°C after light irradiation at 1 W cm⁻². Therefore, photothermal PCM@CNC/rGO/PDA/MF microcapsules are promising for solar energy harvesting, thermal energy storage, and release in various applications, such as energy-efficient buildings and smart textiles.

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通过纤维素纳米晶和氧化石墨烯共稳定皮克林乳液实现光热相变材料微胶囊，用于太阳能和热能储存

相变材料（PCM）能够在相变过程中储存和释放大量热量，因此在热管理领域备受关注。然而，它们的广泛应用受到泄漏问题的限制。将 PCM 封装在聚合物微胶囊中是一种很有前景的策略，可以防止泄漏并增加与基质的热传导面积。此外，光热 PCM 微胶囊尤其适用于太阳能储存。在此，我们以三聚氰胺-甲醛树脂（MF）为外壳，以纤维素纳米晶（CNC）和氧化石墨烯（GO）共稳定的皮克林乳液液滴为模板，制作了光热 PCM 微胶囊。CNC 具有出色的皮克林乳化能力，可促进 GO 在油水界面的固定，从而形成稳定的 CNC/GO 共稳定 PCM 皮克林乳液。通过多巴胺的氧化自聚合作用，在乳液液滴上原位涂覆了聚多巴胺（PDA）层。同时，由于 PDA 的还原能力，GO 被还原成还原型 GO（rGO）。通过 MF 预聚物的聚合和交联，PCM 微胶囊的最外层 MF 壳在原位形成。所制备的 PCM@CNC/rGO/PDA/MF 微胶囊在微米范围内尺寸均匀，具有优异的防漏性能、高相变焓（175.4 J g-1）和 PCM 封装率（84.2%）。此外，rGO 和 PDA 的存在使 PCM@CNC/rGO/PDA/MF 微胶囊具有出色的光热转换性能。在 1 W cm-2 的光照射下，PCM@CNC/rGO/PDA/MF 微胶囊浆料（15 wt.%）的温度可达 73°C。因此，光热PCM@CNC/rGO/PDA/MF微胶囊在太阳能收集、热能储存和释放等方面具有广阔的应用前景，如节能建筑和智能纺织品。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.