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<p>Achieving both high solar reflectance and efficient heat dissipation in polymers remains a key challenge for passive daytime radiative cooling (PDRC). Herein, cellulose acetate/titanium dioxide (CA/TiO<sub>2</sub>) composite films are fabricated via a simple nonsolvent-induced phase separation process. The self-assembled porous structure exhibits a unique dual-gradient distribution in both TiO<sub>2</sub> nanoparticle size and pore dimensions, which synergistically enhances broadband light scattering and mid-infrared emission. The composite demonstrates exceptional optical performance with 97.7% solar reflectance and 97.7% average atmospheric-window emissivity. Under 800&#xa0;W/m<sup>2</sup> solar irradiation, it achieves a temperature reduction of 13.2&#xa0;°C relative to a polyethylene-covered reference and sustains an average sub-ambient cooling of 7.5&#xa0;°C, while maintaining a tensile strength of ~ 2.7&#xa0;MPa. In practical tests, ice cubes covered with the composite retain 38.4% of their mass after 3h, whereas uncovered ice melts completely; additionally, strawberry shelf life is extended by 3–4&#xa0;days. This work establishes CA/TiO<sub>2</sub> nanocomposites as a sustainable, passive cooling platform that addresses key challenges in both energy-free thermal management and food preservation.</p> Graphical abstract

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Porous cellulose acetate cooling films for enhanced ice retention and food preservation through daytime radiative cooling

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Li Lv,
  • Hao Zeng,
  • Boxuan Zhu,
  • Yaping Zhao,
  • Liangmiao Zhang

摘要

Achieving both high solar reflectance and efficient heat dissipation in polymers remains a key challenge for passive daytime radiative cooling (PDRC). Herein, cellulose acetate/titanium dioxide (CA/TiO2) composite films are fabricated via a simple nonsolvent-induced phase separation process. The self-assembled porous structure exhibits a unique dual-gradient distribution in both TiO2 nanoparticle size and pore dimensions, which synergistically enhances broadband light scattering and mid-infrared emission. The composite demonstrates exceptional optical performance with 97.7% solar reflectance and 97.7% average atmospheric-window emissivity. Under 800 W/m2 solar irradiation, it achieves a temperature reduction of 13.2 °C relative to a polyethylene-covered reference and sustains an average sub-ambient cooling of 7.5 °C, while maintaining a tensile strength of ~ 2.7 MPa. In practical tests, ice cubes covered with the composite retain 38.4% of their mass after 3h, whereas uncovered ice melts completely; additionally, strawberry shelf life is extended by 3–4 days. This work establishes CA/TiO2 nanocomposites as a sustainable, passive cooling platform that addresses key challenges in both energy-free thermal management and food preservation.

Graphical abstract