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Scientists Developed A Sunscreen That, Besides Protecting Against UV Rays, Can Reduce Body Temperature By Up To 6 Degrees
Using sunscreen is essential to protect the skin against the harmful effects of ultraviolet (UV) radiation, but it does not provide immediate relief from heat. Now, scientists have developed a new formula that, in addition to protecting against UV rays, also reduces body temperature through radiative cooling.
The study, published in the journal Nano Letters of the American Chemical Society (ACS), shows that the innovation can keep human skin up to 6 degrees Celsius cooler than skin directly exposed to the sun, offering a promising solution for hot days.
How Does Radiative Cooling Work?
Radiative cooling is a physical phenomenon in which heat is reflected or radiated away from a surface, reducing its temperature.
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This technology is already used in fabrics and building coatings to regulate the temperature of environments.
In the case of the new sunscreen, the team of researchers led by Rufan Zhang adjusted the size of titanium dioxide (TiO₂) nanoparticles, a common ingredient in mineral sunscreens, to maximize both UV protection and the cooling effect.
Composition And Efficiency Of The New Sunscreen
The innovative formula of the sunscreen is composed of six main ingredients: TiO₂ nanoparticles, water, ethanol, moisturizer, pigments, and polydimethylsiloxane, a silicone polymer commonly used in cosmetics.
The scientists carefully adjusted the size of the nanoparticles to maximize the reflection of sunlight and heat.
In the tests conducted, the new sunscreen showed a Sun Protection Factor (SPF) of approximately 50, water resistance, and effectiveness for up to 12 hours under simulated sunlight exposure. Additionally, when applied to the skin of humans and animals, it did not cause irritation, demonstrating safety for daily use.
Tests And Impressive Results
To evaluate the efficiency of the new sunscreen, the researchers conducted tests under real conditions of heat and humidity.
The results were promising: the product kept the skin of participants up to 6 degrees Celsius cooler than skin directly exposed to the sun and about 3 degrees Celsius cooler than conventional sunscreens. This difference can represent significant relief for those suffering from intense heat.
Another positive point is the affordable cost of the new formula. The prototype can be produced for only US$ 0.92 for every 10 grams of the mixture, making it competitive with existing products on the market.
Impact And Future Perspectives
The development of this sunscreen represents a significant advance, especially in the context of climate change and increasingly high temperatures.
With this, it can become an effective solution for workers exposed to the sun, athletes, tourists, and anyone seeking sun protection without the discomfort of excessive heat.
In the future, it is expected that this technology will be improved to include other benefits, such as prolonged hydration and even greater resistance to water and sweat.
Cosmetics and pharmaceutical companies are already attentive to the commercial potential of this product, which may lead to rapid market expansion for sunscreens with radiative cooling.
The new sunscreen that reduces skin temperature is a relevant scientific advancement, combining UV protection and thermal comfort.
Its cooling effect, proven safety, and affordable cost indicate that it could transform the sunscreen market in the coming years.
With this, this innovation promises to bring more well-being to millions of people who face high temperatures daily. Now, it remains to follow the next steps for the arrival of this product on the shelves.
With information from ACS.
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