Wei Qiang, Sun Wang, Zhang Zhe, Zhou Guofu, Zhang Zhen
SCNU-TUE Joint Lab of Device Integrated Responsive Materials (DIRM), National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.
SCNU-TUE Joint Lab of Device Integrated Responsive Materials (DIRM), National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.
Int J Biol Macromol. 2025 Jan;284(Pt 1):138162. doi: 10.1016/j.ijbiomac.2024.138162. Epub 2024 Nov 28.
Phase change materials (PCMs) are promising for thermal energy storage due to their high latent enthalpy and constant phase change temperature. However, organic PCMs suffer from leaking, low thermal conductivity, and flammability. Herein, high thermal conductivity, photothermal and flame-proof docosane microcapsules with melamine-formaldehyde (MF) and polypyrrole (PPy) (C-CMFP) were reported with cellulose nanocrystal (CNC) stabilized Pickering emulsion droplets as templates through in-situ polymerization. CNCs showed outstanding C Pickering emulsifying ability with the presence of NaCl and provided ideal templates for C microcapsules. The obtained C-CMFP microcapsules displayed high enthalpy (205.7 J/g), C core ratio (86.1 %), and stability. The C-CMFP microcapsules retained an outstanding enthalpy remaining ratio (98.9 %) after 100 times cooling/heating cycles and could tolerate 100 °C for 12 h without leaking due to the robust hybrid CMFP shell. PPy significantly improved the thermal conductivity and photothermal conversion efficiency of C-CMFP microcapsules. The C-CMFP microcapsules exhibited a high thermal conductivity of 0.683 W/(m·K). The maximum temperature of C-CMFP microcapsules under light irradiation for 18 min was 60.4 °C. Moreover, C-CMFP microcapsules showed superb flame-proof properties. This study provides a facile approach to fabricate high enthalpy, stable, thermal conductive, photothermal, and flame-proof PCM microcapsules for solar harvesting and thermal energy storage.
相变材料（PCM）因其高潜热和恒定的相变温度而在热能存储方面具有广阔前景。然而，有机相变材料存在泄漏、低导热性和易燃性等问题。在此，通过原位聚合法，以纤维素纳米晶体（CNC）稳定的皮克林乳液液滴为模板，报道了具有三聚氰胺 - 甲醛（MF）和聚吡咯（PPy）（C - CMFP）的高导热性、光热和防火正二十二烷微胶囊。在NaCl存在下，CNC表现出出色的皮克林乳化能力，并为微胶囊提供了理想的模板。所制备的C - CMFP微胶囊具有高焓（205.7 J/g）、芯材比例（86.1%）和稳定性。经过100次冷却/加热循环后，C - CMFP微胶囊的焓保留率仍高达98.9%，并且由于坚固的混合CMFP壳，在100°C下可耐受12小时而不泄漏。PPy显著提高了C - CMFP微胶囊的导热性和光热转换效率。C - CMFP微胶囊的导热率高达0.683 W/(m·K)。在光照18分钟后，C - CMFP微胶囊的最高温度为60.4°C。此外，C - CMFP微胶囊还表现出卓越的防火性能。本研究提供了一种简便的方法来制备用于太阳能收集和热能存储的高焓、稳定、导热、光热和防火的相变材料微胶囊。
