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Scientists have developed a sunscreen that, in addition to protecting against UV rays, can reduce body temperature by up to 6 degrees
Wearing sunscreen is essential to protect your skin from the harmful effects of ultraviolet (UV) radiation, but it doesn't provide immediate relief from the heat. Now, scientists have developed a new formula that not only protect against UV rays, it also reduces body temperature through radiative cooling.
The study, published in the journal Nano Letters da American Chemical Society (ACS), shows that the innovation can keep human skin up to 6 degrees Celsius cooler than skin exposed directly 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 coverings to regulate the temperature of environments.
In the case of the new sunscreen, the research team led by Rufan Zhang tweaked the size of titanium dioxide (TiO₂) nanoparticles, a common ingredient in mineral sunscreens, to maximize both UV protection and cooling effects.
Composition and efficiency of the new sunscreen
The sunscreen's innovative formula is composed of six main ingredients: TiO₂ nanoparticles, water, ethanol, moisturizing cream, pigments and polydimethylsiloxane, a silicone polymer commonly used in cosmetics.
Scientists carefully tuned the size of the nanoparticles to maximize reflection of sunlight and heat.
In tests, the new sunscreen presented a Sun Protection Factor (SPF) of approximately 50, water resistance and effectiveness for up to 12 hours under simulated exposure to sunlight. Furthermore, when applied to the skin of humans and animals, it did not cause irritation, demonstrating safety for daily use.
Impressive tests and results
To evaluate the effectiveness of the new sunscreen, researchers carried out tests in real conditions of heat and humidity.
The results were promising: the product kept participants' skin up to 6 degrees Celsius cooler than skin exposed to direct sunlight and about 3 degrees Celsius cooler than conventional sunscreens. This difference could be a huge relief for those who suffer from intense heat.
Another positive point is the affordable cost of the new formula. The prototype can be produced for just US$0,92 for every 10 grams of the mixture, making it competitive in relation to products already on the market.
Impact and future perspectives
The development of this sunscreen represents a significant advance, especially in a context of climate change and increasingly high temperatures.
This makes it an effective solution for sun-exposed workers, athletes, tourists and anyone looking for sun protection without the discomfort of excessive heat.
In the future, this technology is expected to be improved to include other benefits, such as prolonged hydration and even greater resistance to water and sweat.
Cosmetic and pharmaceutical companies are already aware of the commercial potential of this product, which could lead to a rapid expansion of the market for radiatively cooled sunscreens.
The new sunscreen that reduces skin temperature is a relevant scientific advance, combining UV protection and thermal comfort.
Its cooling effect, proven safety and affordable cost indicate that it could transform the sun protection market in the coming years.
With that, this innovation promises to bring more well-being to millions of people who face high temperatures every day. Now, all that remains is to follow the next steps for this product to reach the shelves.
With information ACS.
