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Visual Gustation via Regulable Elastic Photonic Crystals
Xinyuan Xie1, Suiting Zheng1, Yunyan Liu1
1College of Chemistry and Materials Science, Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Su Bingtian Center for Speed Research and Training, Jinan University, Guangzhou 510632, China.
This study introduces a new hydrogel photonic crystal (PC) that changes color with elasticity, enabling visual detection of various substances for wearable sensors. This chemo-mechanical transduction offers a new platform for real-time monitoring.
Area of Science:
- Materials Science
- Nanotechnology
- Biomedical Engineering
Background:
- Photonic crystals (PCs) offer tunable light properties but current elastic PCs have limitations in modulus control and structural color.
- Hydrogel PCs show promise for health and environmental monitoring due to biocompatibility and flexibility.
- Existing elastic PCs face challenges in in situ detection for wearable devices due to fixed elastic modulus and uncontrollable structural colors.
Purpose of the Study:
- To develop a novel chemo-mechanical transduction mechanism for hydrogel photonic crystals (PCs).
- To create a visual sensing experience based on tunable structural colors.
- To establish a precise relationship between structural colors and elastic modulus for advanced applications.
Main Methods:
- Fabrication of a hydrogel PC nanomatrix with embedded chemo-mechanical transduction.
- Utilizing finite element analysis to study electric field distribution during stretching.
- Investigating elastic-optical behaviors with various chemical cosolvents (cations, anions, saccharides, organic acids).
- Demonstrating the Hofmeister effect's role in regulating hydrogel elasticity.
Main Results:
- The hydrogel PC matrix successfully generated tunable structural colors.
- Demonstrated efficient discrimination of various analytes (cations, anions, saccharides, organic acids) across different concentrations and mixtures.
- Successfully analyzed real food samples, including tastes and soups.
- Established a precise correlation between structural colors and the elastic modulus of the hydrogel PCs.
Conclusions:
- The developed hydrogel PC platform offers a visual gustation sensing experience.
- The chemo-mechanical transduction mechanism enables precise analyte detection through optical changes.
- This elastic-optics platform is suitable for biomatching in wearable devices, dynamic environments, and clinical monitoring.
