Transparent and UV Blocking Structural Colored Hydrogel for Contact Lenses.

Area of Science:

• Materials Science
• Optics
• Biomedical Engineering

Background:

• Perfectly periodic structures in materials can yield desirable optical properties, but may not always provide comprehensive light protection.
• Conventional materials often struggle to balance vibrant structural color with effective ultraviolet (UV) light blocking.

Purpose of the Study:

• To develop structural colored hydrogel films with enhanced UV blocking capabilities for contact lens applications.
• To investigate the relationship between structural periodicity and optical properties, specifically color and UV absorption.

Main Methods:

• Theoretical simulations were employed to predict optical behavior based on structural periodicity.
• Fabrication of hydrogel films with quasi-periodic polystyrene sphere arrays within a poly(hydroxyethyl methacrylate) matrix.
• Characterization of optical properties, including color brilliance and UV blocking efficiency.
• Cell proliferation assays to assess cytocompatibility.

Main Results:

• Hydrogel films with quasi-periodic structures exhibited brilliant structural colors and perfect UV blocking.
• Theoretical predictions were validated by experimental fabrication.
• Optimized core particle composition and size were identified for contact lens suitability.
• The hydrogel demonstrated excellent cytocompatibility.

Conclusions:

• Slightly breaking structural periodicity in hydrogels is an effective strategy to achieve both structural color and superior UV blocking.
• The developed hydrogel material shows significant potential for advanced applications including UV-protective devices and medical implants.