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China Surfactant Detergent & Cosmetics ›› 2025, Vol. 55 ›› Issue (12): 1575-1581.doi: 10.3969/j.issn.2097-2806.2025.12.010

• Development and application • Previous Articles     Next Articles

Preparation of titanium dioxide@aluminum hydroxide-sodium alginate composite nanoparticles and their application in sunscreen lotions

Huamin Liu,Yue Cai,Junjie Nian,Fengqin Wu,Chao Yao,Haoguan Gui*()   

  1. School of Petrochemical Engineering, Changzhou University, Changzhou, Jiangsu 213164, China
  • Received:2025-01-13 Revised:2025-12-18 Online:2025-12-22 Published:2026-01-23
  • Contact: *E-mail: yaochao420@163.com.

Abstract:

Titanium dioxide@aluminum hydroxide-sodium alginate composite nanoparticles (Ti@Al-SA NPs) were prepared through the electrostatic adsorption between titanium dioxide@aluminum hydroxide and sodium alginate (SA). Subsequently, these composite nanoparticles were dispersed into a slurry, and the slurry was further formulated into a sunscreen lotion. The mechanism of SA adsorption on the surface of Ti@Al NPs was studied using Zeta potential measurement. Thermogravimetric analysis (TGA) was used to determine the adsorption amount. Polarizing microscopy was employed to observe the emulsion morphology. Rheological properties were investigated using a rheometer, and the sun protection factor (SPF) of the emulsion was tested using an SPF meter. Additionally, thermal shock tests were conducted to evaluate the stability of emulsions. The results indicated that the adsorption interaction between SA and Ti@Al NPs was the strongest at pH of 5. The adsorption amount of SA in the Ti@Al-SA0.2 NPs thus prepared was 14.2%. The corresponding aqueous slurry was prepared with Ti@Al-SA0.2 NPs in a solid content of 25.0%, achieving a viscosity of 954.8 mPa·s. The SPF of the prepared emulsion reached a maximum of 22.5. After five heating-cooling cycles, the emulsion did not break and its viscosity maintained at more than 80% of the original viscosity, with the SPF remaining above 95% of the original value.

Key words: titanium dioxide, sodium alginate, electrostatic adsorption, nanocomposite, sunscreen cosmetics

CLC Number: 

  • TQ658