Lookout! The Future of Sunscreen Begins Under the Australian Sun | Nuwangi Cooray | TEDxWollongong

Nuwangi Cooray begins by sharing her personal experience of underestimating Australian UV radiation despite coming from a tropical country, which led to severe sunburn during beach experiments. This experience highlighted how UV radiation is deceptive because it cannot be felt like heat or humidity, yet it causes significant health impacts. She emphasizes that skin cancers are among the most commonly diagnosed cancers worldwide, with two in three Australians developing skin cancer in their lifetime.

Cooray challenges the conventional understanding of sun protection, arguing that UV protection is not about sunscreen strength but about cumulative UV exposure over time. She explains that current SPF testing is based on standardized indoor laboratory conditions developed for European environments, which don't accurately represent the extreme and variable UV conditions found across Australia. Real sunlight changes constantly due to cloud movement, sun angle shifts, and reflections from surfaces like water and sand.

A critical issue she identifies is the discrepancy between laboratory testing application rates and real-world usage. While SPF numbers are determined using thick application rates, people typically apply much less sunscreen, significantly reducing the actual protection. She introduces the concept of UV dose, comparing the UV index to the speed of a car and explaining how biological impact depends on both UV intensity and exposure time.

For her PhD research, Cooray developed advanced nano UV filters using titanium dioxide nanoparticles. She addressed the problem of reactive oxygen species (ROS) generation, which can harm skin, by designing particle surfaces that target harmful reaction sites while maintaining UV protection and reducing the white cast effect that particularly affects darker skin tones. Her research at the University of Wollongong involved continuous UV measurement and dose calculation under real Australian conditions, demonstrating that popular sunscreens perform differently under varying UV intensities. The team is developing dynamic protection systems that incorporate skin type, real-time UV conditions, outdoor time, and reapplication reminders, transforming sunscreen from a static product into an adaptive system designed for extreme UV conditions and real human behavior.