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Structurally Colored Photonic Janus Films for Switchable Radiative Cooling and Solar Heating.

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Title: Structurally Colored Photonic Janus Films for Switchable Radiative Cooling and Solar Heating.
Authors: Wei, Wei1 (AUTHOR), Gu, Hengrui1,2 (AUTHOR), Zhao, Xingchen1,3 (AUTHOR), Lu, Yulong1,4 (AUTHOR), Li, Kerui1,2 (AUTHOR), Wang, Hongzhi1,2,3 (AUTHOR) wanghz@dhu.edu.cn, Zhang, Jianjun3,4 (AUTHOR)
Source: Nanomaterials (2079-4991). May2026, Vol. 16 Issue 10, p603. 13p.
Subjects: Solar heating, Cellulose nanocrystals, Heat radiation & absorption, Temperature control, Carbon nanotubes, Optical films
Abstract: Personal thermal management (PTM) requires materials that can adapt to dynamically changing environments, yet most existing systems are limited to single-mode cooling or heating and lack tunable optical appearance. Here, we report a structurally colored photonic Janus film that enables switchable radiative cooling and solar heating within a single material platform. The cooling side is based on cellulose nanocrystal (CNC) photonic structures, providing high mid-infrared emissivity (up to 0.91) while enabling tunable structural color through pitch modulation, thereby achieving radiative cooling without sacrificing visual appearance. The heating side consists of a carbon nanotube (CNT) layer with high solar absorptivity (~92%), enabling efficient photothermal conversion, further enhanced by low-voltage Joule heating. By simply flipping the film, reversible switching between cooling and heating modes is achieved, allowing adaptation to varying thermal conditions. In addition, the system is compatible with continuous fabrication, enabling scalable production. This work demonstrates a dual-mode photonic thermal management system that integrates optical tunability with switchable thermal regulation, providing a viable pathway toward wearable microclimate control. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Structurally Colored Photonic Janus Films for Switchable Radiative Cooling and Solar Heating.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Wei%2C+Wei%22">Wei, Wei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gu%2C+Hengrui%22">Gu, Hengrui</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhao%2C+Xingchen%22">Zhao, Xingchen</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lu%2C+Yulong%22">Lu, Yulong</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Kerui%22">Li, Kerui</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Hongzhi%22">Wang, Hongzhi</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<i> wanghz@dhu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Jianjun%22">Zhang, Jianjun</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)
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  Label: Source
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. May2026, Vol. 16 Issue 10, p603. 13p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Solar+heating%22">Solar heating</searchLink><br /><searchLink fieldCode="DE" term="%22Cellulose+nanocrystals%22">Cellulose nanocrystals</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+radiation+%26+absorption%22">Heat radiation & absorption</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+control%22">Temperature control</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+nanotubes%22">Carbon nanotubes</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+films%22">Optical films</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Personal thermal management (PTM) requires materials that can adapt to dynamically changing environments, yet most existing systems are limited to single-mode cooling or heating and lack tunable optical appearance. Here, we report a structurally colored photonic Janus film that enables switchable radiative cooling and solar heating within a single material platform. The cooling side is based on cellulose nanocrystal (CNC) photonic structures, providing high mid-infrared emissivity (up to 0.91) while enabling tunable structural color through pitch modulation, thereby achieving radiative cooling without sacrificing visual appearance. The heating side consists of a carbon nanotube (CNT) layer with high solar absorptivity (~92%), enabling efficient photothermal conversion, further enhanced by low-voltage Joule heating. By simply flipping the film, reversible switching between cooling and heating modes is achieved, allowing adaptation to varying thermal conditions. In addition, the system is compatible with continuous fabrication, enabling scalable production. This work demonstrates a dual-mode photonic thermal management system that integrates optical tunability with switchable thermal regulation, providing a viable pathway toward wearable microclimate control. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.3390/nano16100603
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      – Code: eng
        Text: English
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        PageCount: 13
        StartPage: 603
    Subjects:
      – SubjectFull: Solar heating
        Type: general
      – SubjectFull: Cellulose nanocrystals
        Type: general
      – SubjectFull: Heat radiation & absorption
        Type: general
      – SubjectFull: Temperature control
        Type: general
      – SubjectFull: Carbon nanotubes
        Type: general
      – SubjectFull: Optical films
        Type: general
    Titles:
      – TitleFull: Structurally Colored Photonic Janus Films for Switchable Radiative Cooling and Solar Heating.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Wei, Wei
      – PersonEntity:
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            NameFull: Gu, Hengrui
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            NameFull: Zhao, Xingchen
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            NameFull: Lu, Yulong
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            NameFull: Li, Kerui
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            NameFull: Wang, Hongzhi
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            NameFull: Zhang, Jianjun
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            – D: 15
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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            – TitleFull: Nanomaterials (2079-4991)
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