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Impact Factor:8.758

DOI Number:10.1021/acsami.4c22615

Journal:ACS Applied Materials & Interfaces

Key Words:radiative cooling, bacterial cellulose-based composite film, cross-linked network structure, UV resistance, freshness preservation

Abstract:Radiative cooling, a passive cooling technology, functions by reflecting the majority of solar radiation (within the solar spectrum of 0.3−2.5 μm) and emitting thermal radiation (within the atmospheric windows of 8−13 μm and 16−20 μm). Predominantly, synthetic polymers are effectively utilized for radiative cooling while posing potential environmental hazards due to their complex components, toxicity, or non biodegradation. Bacterial cellulose, a natural and renewable biopolymer, stands out due to its environmentally friendly, scalability, high purity, and significant infrared emissivity. In this work, we developed a bacterial cellulose-based composite film (BCF) with a cross-linked network structure by a facile agitation spraying method to achieve enhanced and sustainable radiative cooling performance. The BCF exhibited superior optical properties and environmental tolerance, with a notable infrared emissivity of 94.6%. As a result, the thermal emitter demonstrates a substantial subambient cooling capacity (11:00 to 13:00, maximum drop of 7.15 °C, average drop of 4.85 °C; 22:00 to 2:00, maximum drop of 2.7 °C, average drop of 2.32 °C). Additionally, the BCF maintained stable emissivity after 240 h of continuous UV irradiation. Furthermore, BCF can effectively preserve the freshness of fruits under intense solar irradiation. Hence, BCF with high radiative cooling performance presents a broad application prospect in building energy conservation, solar cells efficiency enhancement, and food transportation packaging.

First Author:Yuan-Cheng Ding,Guo-Wei Tang

Indexed by:Journal paper

Correspondence Author:Hao-Yu Zhao,HaoYu Zhao

Volume:17

Issue:4

Page Number:6857–6866

ISSN No.:1944-8244

Translation or Not:no

Date of Publication:2025-01-20

Included Journals:SCI

Publication links:https://doi.org/10.1021/acsami.4c22615

Date of Publication:2025-01-20