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<p>Directional thermal management is critical for energy harvesting and utilization. The common passive radiative cooling and heating strategies free of electricity input mainly focus on regulating the solar and thermal radiation properties of materials while neglecting the thermal conduction process. The directional thermal management for harvesting thermal energy based on the rare thermal rectifying materials is usually in the absence of radiation regulation. Here, the dual Janus foams with dual asymmetries in photothermal and thermal rectification are designed and exhibit high photothermal property contrast and excellent thermal rectification ratios (122 %). The temperature difference ratio of the managed end could be improved nearly 21 times from 3 % based on a single Janus structure to 65 % based on a dual Janus structure. This method provides a comprehensive and inspiring view for better directional thermal management in the future.</p>

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Dual Janus foam for directional thermal management

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月2日

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  • Chao Jiang,
  • Xingmei He,
  • Xinghua Zheng,
  • Fuxin Liang

摘要

Directional thermal management is critical for energy harvesting and utilization. The common passive radiative cooling and heating strategies free of electricity input mainly focus on regulating the solar and thermal radiation properties of materials while neglecting the thermal conduction process. The directional thermal management for harvesting thermal energy based on the rare thermal rectifying materials is usually in the absence of radiation regulation. Here, the dual Janus foams with dual asymmetries in photothermal and thermal rectification are designed and exhibit high photothermal property contrast and excellent thermal rectification ratios (122 %). The temperature difference ratio of the managed end could be improved nearly 21 times from 3 % based on a single Janus structure to 65 % based on a dual Janus structure. This method provides a comprehensive and inspiring view for better directional thermal management in the future.