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<p>In this study, carbon nanotubes ( CNTs) were innovatively used as photothermal conversion enhancement media, combined with the natural porous structure of Juncus effusus ( JE) and paraffin ( PA) phase change materials, and finally encapsulated with polyvinyl alcohol ( PVA) to successfully construct a ternary composite phase change material ( PVA-JE-CNTs-PA) with high photothermal conversion performance. After optimizing the JE matrix structure by NaClO pretreatment (lignin mass loss of 13.5%), the three-dimensional micron-scale network constructed by CNTs on the surface of JE fibers showed unique structural advantages: its special topology not only achieved efficient physical encapsulation of PA (maximum adsorption rate of 2578%), but also formed a double confinement system through PVA surface coating, so that the PA retention rate was close to 100%. The experimental results show that the introduction of CNTs significantly improves the comprehensive properties of the composites. When the CNTs loading reaches 24%, the thermal conductivity of the material increases to 0.2037 W/m·K (122% higher than that of pure PA), and shows a significant advantage in the photothermal conversion test. Under simulated solar irradiation, the heating rate of PVA-JE6-CNTs/PA is 34.39% higher than that of the system without CNTs (the temperature reaching time at 65 ℃ is shortened to 12.3&#xa0;min).SEM characterization confirmed that the CNTs network formed an interpenetrating structure with JE fibers, and a high-efficiency heat transfer channel was constructed in cooperation with PA. The material has both high phase change latent heat (melting/solidification latent heat of 139.2&#xa0;J/g and 138.0&#xa0;J/g, respectively) and excellent cycle stability. Its unique ' biological template-carbon nanotube ' composite structure design provides innovative ideas for the development of new photothermal conversion materials.</p> Graphical Abstract <p></p>

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Preparation and photothermal conversion properties of modified Juncus effusus-loaded carbon nanotubes-paraffin composite phase change materials

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Yanhong Du,
  • Fuzhuang Jia,
  • Mengke Wang,
  • Baolian Zhang,
  • Xiaolan Liao

摘要

In this study, carbon nanotubes ( CNTs) were innovatively used as photothermal conversion enhancement media, combined with the natural porous structure of Juncus effusus ( JE) and paraffin ( PA) phase change materials, and finally encapsulated with polyvinyl alcohol ( PVA) to successfully construct a ternary composite phase change material ( PVA-JE-CNTs-PA) with high photothermal conversion performance. After optimizing the JE matrix structure by NaClO pretreatment (lignin mass loss of 13.5%), the three-dimensional micron-scale network constructed by CNTs on the surface of JE fibers showed unique structural advantages: its special topology not only achieved efficient physical encapsulation of PA (maximum adsorption rate of 2578%), but also formed a double confinement system through PVA surface coating, so that the PA retention rate was close to 100%. The experimental results show that the introduction of CNTs significantly improves the comprehensive properties of the composites. When the CNTs loading reaches 24%, the thermal conductivity of the material increases to 0.2037 W/m·K (122% higher than that of pure PA), and shows a significant advantage in the photothermal conversion test. Under simulated solar irradiation, the heating rate of PVA-JE6-CNTs/PA is 34.39% higher than that of the system without CNTs (the temperature reaching time at 65 ℃ is shortened to 12.3 min).SEM characterization confirmed that the CNTs network formed an interpenetrating structure with JE fibers, and a high-efficiency heat transfer channel was constructed in cooperation with PA. The material has both high phase change latent heat (melting/solidification latent heat of 139.2 J/g and 138.0 J/g, respectively) and excellent cycle stability. Its unique ' biological template-carbon nanotube ' composite structure design provides innovative ideas for the development of new photothermal conversion materials.

Graphical Abstract