A new sunscreen could provide both UV protection and cooling.

A sunscreen compound developed by Chinese researchers employs radiative cooling technology, a method already utilised in cooling fabrics and architectural coatings, to keep skin significantly cooler under sunlight.

The sunscreen uses titanium dioxide (TiO₂) nanoparticles, a common ingredient in mineral sunscreens. However, the researchers fine-tuned the size of these nanoparticles to enable not just UV light reflection but also heat reflection, achieving a cooling effect. 

Lead researcher Rufan Zhang says the research team’s goal was to create a product offering both protection and comfort in the increasingly intense summer heat.

During tests, the sunscreen reduced skin temperature by up to 6℃ compared to untreated skin and by approximately 3℃ compared to conventional sunscreens. 

This performance was attributed to its ability to reflect up to 90.19 per cent of solar radiation while emitting heat effectively through mid-infrared wavelengths, a process known as radiative cooling. 

In addition to its cooling effects, the sunscreen demonstrated an SPF rating of 50, offering robust UV protection. 

It remained effective for 12 hours under simulated sunlight and displayed excellent water resistance, qualities that align it with the demands of commercial sunscreen products.

The researchers tested the sunscreen on both human and animal skin and confirmed its safety, reporting no irritation during the trials. 

Cost-effectiveness was another highlight, with production costs estimated at $0.92 for 10 grams, aligning it with or even undercutting current market prices.

Dr Zhang and his team say the experimental product has high commercial potential, particularly in light of global warming and rising summer temperatures. 

With its successful initial testing phase, the product could set a new standard for sunscreen efficacy, addressing not just the need for UV protection but also the discomfort of heat exposure during outdoor activities.

More details are accessible here.

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