PEG Surface Modification of Microcrystalline Cellulose@Nanotitanium Dioxide Core-Shell Composite to Improve Sunscreen...

Area of Science:

• Materials Science
• Nanotechnology
• Cosmetic Science

Background:

• Particle aggregation of microcrystalline cellulose@nano-TiO2 (MCC@nano-TiO2) hinders grinding and risks nano-TiO2 release.
• Surface modification is crucial to prevent agglomeration and ensure safety in cosmetic applications.

Purpose of the Study:

• To investigate the effects of polyethylene glycol (PEG) modification on the structure and properties of MCC@nano-TiO2 composites.
• To enhance the dispersibility, UV protection, and stability of nano-TiO2-based sunscreens.

Main Methods:

• Synthesized MCC@nano-TiO2 core-shell composites with varying PEG amounts.
• Analyzed structural changes and UV protection capabilities before and after PEG modification.
• Evaluated particle dispersibility, aggregation, and nano-TiO2 release.

Main Results:

• A 6% PEG modification at a 60:40 MCC:nano-TiO2 ratio significantly improved dispersibility and UV protection.
• PEG alteration of the nano-TiO2 shell structure enhanced UV reflection and scattering, extending UVA range (critical wavelength 376 nm).
• PEG modification minimized particle agglomeration and potential nano-TiO2 release.

Conclusions:

• PEG surface modification is effective in stabilizing MCC@nano-TiO2 composites for cosmetic use.
• Optimized PEG treatment enhances sunscreen performance and safety by improving dispersibility and UV blocking.
• This approach offers a pathway for the industrialization of core-shell nano-TiO2 materials.