A Radiative-Cooling Hierarchical Aligned Porous Poly(vinylidene fluoride) Film by Freeze-Thaw-Promoted Nonsolvent-Induced Phase Separation

Yiting Zhang; Jiahui Sun; Yufeng Wang; Yunchen Wu; Chun Huang; Chao Zhang; Tianxi Liu

doi:10.1007/s10118-024-3128-2

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A Radiative-Cooling Hierarchical Aligned Porous Poly(vinylidene fluoride) Film by Freeze-Thaw-Promoted Nonsolvent-Induced Phase Separation

RESEARCH ARTICLE | Updated：2024-06-26

- A Radiative-Cooling Hierarchical Aligned Porous Poly(vinylidene fluoride) Film by Freeze-Thaw-Promoted Nonsolvent-Induced Phase Separation
- Chinese Journal of Polymer Science Vol. 42, Issue 7, Pages: 976-983(2024)
- Affiliations：
  
  a.Key Laboratory of Synthetic and Biological Colloids Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
  b.State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
- Author bio：
  
  czhang@dhu.edu.cn (C.Z.)
  txliu@jiangnan.edu.cn (T.X.L.)
- Funds：
- DOI：10.1007/s10118-024-3128-2
  CLC：
- Received：30 January 2024，
  
  Revised：2024-03-07，
  
  Accepted：20 March 2024，
  
  Online First：07 May 2024，
  
  Published：01 July 2024
- Accepted：
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Zhang, Y.; Sun, J.; Wang, Y.; Wu, Y.; Huang, C.; Zhang, C.; Liu, T. X. A radiative-cooling hierarchical aligned porous poly(vinylidene fluoride) film by freeze-thaw-promoted nonsolvent-induced phase separation. Chinese J. Polym. Sci. 2024, 42, 976–983

Yiting Zhang, Jiahui Sun, Yufeng Wang, et al. A Radiative-Cooling Hierarchical Aligned Porous Poly(vinylidene fluoride) Film by Freeze-Thaw-Promoted Nonsolvent-Induced Phase Separation[J]. Chinese Journal of Polymer Science, 2024, 42(7): 976-983.
Zhang, Y.; Sun, J.; Wang, Y.; Wu, Y.; Huang, C.; Zhang, C.; Liu, T. X. A radiative-cooling hierarchical aligned porous poly(vinylidene fluoride) film by freeze-thaw-promoted nonsolvent-induced phase separation. Chinese J. Polym. Sci. 2024, 42, 976–983 DOI： 10.1007/s10118-024-3128-2.

Yiting Zhang, Jiahui Sun, Yufeng Wang, et al. A Radiative-Cooling Hierarchical Aligned Porous Poly(vinylidene fluoride) Film by Freeze-Thaw-Promoted Nonsolvent-Induced Phase Separation[J]. Chinese Journal of Polymer Science, 2024, 42(7): 976-983. DOI： 10.1007/s10118-024-3128-2.

摘要

A hierarchical aligned porous poly(vinylidene fluoride) film was prepared by a freeze-thaw-promoted nonsolvent-induced phase separation approach. The resultant film can work as a thermal-insulating radiative cooler

demonstrating high sunlight reflectance of 97%

high mid-infrared selective emissivity of 96% and impressive radiative cooling performance under direct sunlight conditions.

Abstract

Passive daytime radiative cooling (PDRC) is an innovative and sustainable cooling technology that holds immense potential for addressing the energy crisis. Despite the numerous reports on radiative coolers

the design of a straightforward

efficient

and readily producible system remains a challenge. Herein

we present the development of a hierarchical aligned porous poly(vinylidene fluoride) (HAP-PVDF) film through a freeze-thaw-promoted nonsolvent-induced phase separation strategy. This film features oriented microporous arrays in conjunction with random nanopores

enabling efficient radiative cooling performance under direct sunlight conditions. The incorporation of both micro- and nano-pores in the HAP-PVDF film results in a remarkable solar reflectance of 97% and a sufficiently high infrared thermal emissivity of 96%

facilitating sub-environmental cooling at 18.3 °C on sunny days and 13.1 °C on cloudy days. Additionally

the HAP-PVDF film also exhibits exceptional flexibility and hydrophobicity. Theoretical calculations further confirm a radiative cooling power of 94.8 W·m

−2

under a solar intensity of 1000 W·m

−2

demonstrating a performance comparable to the majority of reported radiative coolers.

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references

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