Advancements in nanotechnology for sunscreens: Preparation, characterization, and mechanisms of UV protection

Nanotechnology based sunscreens have arisen as sophisticated alternatives to conventional formulations, overcoming constraints such as inadequate skin penetration, photoinstability, and potential toxicity of active components. Diverse nanocarrier systems such as liposomes, solid lipid nanoparticles, nanoemulsions, and polymeric nanoparticles exhibit significant advancements, including up to 50 % or more compared to conventional formulations increase in sun protection factor (SPF), particle dimensions ranging from 50 to 200 nm and encapsulation efficiencies surpassing 90 % for UV filters. These systems improve photostability, decrease systemic absorption, and mitigate whitening effects in comparison to conventional sunscreens. Characterization techniques, including dynamic light scattering, electron microscopy, and etc., yield insights into particle size distribution, shape, and stability, which are essential for guaranteeing safety and performance. This study emphasizes recent emphasizes novel developments in the preparation, characterization, and mechanisms of UV protection in nanotechnology based sunscreens, delineating current progress and prospective prospects for safer and more effective solutions.