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Zhengzhou University and UniSA develop durable bioplastic cooling film

Zhengzhou University and UniSA develop durable bioplastic cooling film

Researchers from Zhengzhou University and the University of South Australia (UniSA) have developed a bioplastic metafilm capable of passively cooling surfaces without electricity, according to a study published in Cell Reports Physical Science. The film reflects nearly 99% of solar radiation and reduces surface temperatures by up to 9.2°C during peak sunlight.

Made from plant-based polylactic acid (PLA), the biodegradable metafilm uses a low-temperature separation technique to achieve 98.7% solar reflectance while minimizing heat gain. Field tests in China and Australia demonstrated average cooling of 4.9°C during the day and 5.1°C at night, with up to 6.5°C cooling maintained after prolonged exposure to acidic and ultraviolet conditions.

Unlike conventional passive radiative cooling systems based on petrochemical polymers or ceramics, this PLA-based film offers a biodegradable alternative with high solar reflectance, thermal emission, and durability.

Energy simulations suggest the metafilm could reduce annual building energy consumption by up to 13.1% in some cities, decreasing reliance on air conditioning. The researchers estimate potential savings of up to 20% in extremely hot regions.

“Our metafilm offers an environmentally friendly alternative to air-conditioning, which contributes significantly to carbon emissions,” said Yangzhe Hou, UniSA PhD candidate and co-author.

The team is exploring further applications in areas such as transport, agriculture, electronics, and biomedical cooling.
Related tags: air conditioning
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