2. Academic Validation
  3. Reversible Thermochromic Phase Change Material Microcapsules With High Latent Heat via Cellulose Nanocrystal Stabilized Pickering Emulsion for Smart Coatings

Reversible Thermochromic Phase Change Material Microcapsules With High Latent Heat via Cellulose Nanocrystal Stabilized Pickering Emulsion for Smart Coatings

  • Small. 2025 Sep;21(35):e2505575. doi: 10.1002/smll.202505575.
Jie Wu 1,  Pengcheng Yu 2,  Lijun Wang 3,  Xuejin Zhang 3,  Weiwei Xie 4,  Jin Zeng 5,  Guofu Zhou 1,  Zhen Zhang 1 3 4 6
Affiliations

Affiliations

  • 1 SCNU-TUE Joint Lab of Device Integrated Responsive Materials (DIRM), National Center for International Research on Green Optoelectronics, 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.
  • 2 School of Materials Science and Engineering, Peking University, Beijing, 100871, China.
  • 3 Key Laboratory of Recycling and Eco-Treatment of Waste Biomass of Zhejiang Province, School of Environment and Natural Resources, Zhejiang University of Science and Technology, Hangzhou, 310023, China.
  • 4 Frontiers Science Center for New Organic Matter, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), State Key Laboratory of Advanced Chemical Power Sources, College of Chemistry, Nankai University, Tianjin, 300071, China.
  • 5 Foshan Hongchang Coating, Foshan, 528000, China.
  • 6 Huzhou ScienceK Ltd, Huzhou, 313000, China.
PMID: 40624895 DOI: 10.1002/smll.202505575
Abstract

Thermochromic (TC) smart coatings are promising for temperature indicator and anti-counterfeiting. However, it is still a big challenge to fabricate multifunctional TC coatings with sustainable Materials by facile approaches. Herein, reversible TC phase change material (PCM) microcapsules with high latent heat, stability, rapid color-response, and tunable color-changing temperature are facile prepared via cellulose nanocrystal (CNC) stabilized Pickering emulsion. The mixture of crystal violet lactone (CVL), bisphenol A (BPA) and PCM is used as the three-component TC material and oil phase of Pickering emulsion. Methyl behenate (MB) and coconut oil (CO) are selected as PCMs due to their excellent solubility for CVL/BPA, Pickering emulsifying ability by CNCs, and appropriate phase change temperature (PCT). The obtained TC-PCM microcapsules showed outstanding anti-leaking stability, significant thermal energy storage and release capacity (200.2 J/g and PCM content of 89.0% for TC-MB), and fast color change in seconds. The color-changing mechanism is analyzed by density functional theory. The TC-PCM microcapsules displayed blue color below PCT and turned to white above PCT, which are about 55 and 15 °C during heating for MB and CO. The applications of TC-PCM microcapsules as smart temperature-responsive color-changing coatings are also demonstrated for decorative coating, temperature indicating, information encryption, and anti-counterfeiting.

Keywords

cellulose nanocrystal; microcapsule; phase change material; pickering emulsion; thermochromic.

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