ZnO Nanoparticle-Based Pickering Emulsions with Improved Rheology and Functional Performance: A Comparative Approach

The use of natural compounds and nanostructured systems offers an alternative photoprotection strategy with fewer adverse effects.This study developed a Pickering emulsion based on green coffee oil and quercetin, stabilized with zinc oxide nanoparticles, and compared its rheological and spreading properties with commercial sunscreens.Flow curve, thixotropy, and oscillatory tests were conducted to assess structural stability and shear response.The emulsion exhibited gel-like behavior, a higher yield stress, and superior spreading performance.Although its bioactivity was not evaluated, the formulation proved to be a viable and functional alternative for topical photoprotection applications.