HomeProjectsSustainable Development and Green TechnologiesEco-UV Filters Using Engineered Hollow Spheres

Eco-UV Filters Using Engineered Hollow Spheres

Project Quick Facts

Principal Investigator

  • Prof. NGAI To

    Department of Chemistry

  • Funding Sources

    Innovation and Technology Commission

  • Collaboration

    O-Spheres Limited

Chemical and physical filters are the active ingredients in many personal care products to block harmful UV rays. However, chemical filters could often trigger skin irritation and link to hormone disruption. Moreover, some of them are toxic to coral reefs. As a safer alternative, conventional physical filters such as titanium dioxide (TiO2) and zinc oxide (ZnO), usually leave unwanted white masks on the skin. The team has successfully developed hollow mineral-based spheres as physical sunblocker. The synergy between TiO2 and hollow structure not only boosts up UV rays blocking power, but also tackles thick texture and unwanted white masks problems. They are safe for both humans and wildlife, and microplastics-free.

Our novel sunblocker is composed of pure TiO2 minerals assembled at the interface to form a polymer-free hollow particles (i) & (ii). The hollow UV filters exemplify better UV protection power than commercially available products in terms of (iii) UV reflectance and reducing the undesirable whitening effect

Uniqueness and Competitive Advantages:

• Microplastics-free
• Safe to human and wildlife
• Lower the content of physical UV filters in cosmetic formulation
• Non-whitening effect (Tackle the opaque problem)
• Comparable or enhanced SPF power when compared to conventional UV filters

Demonstration of avoiding opaque problem of conventional (A) ZnO SPF formulation, (B-C) TiO2 SPF formulations and (D) Novel hollow TiO2 SPF formulation

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