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Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...

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Updated: Sep 30, 2025

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering

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Published on: December 21, 2017

Optical Indicators based on Structural Colored Polymers.

Yari Foelen^1,2, Albert P H J Schenning^1,2,3

¹Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Den Dolech 2, Eindhoven, 5600 MB, The Netherlands.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|March 12, 2022

Summary

This summary is machine-generated.

This review covers polymer indicators that use structural color for optical signaling. These materials change color autonomously when exposed to stimuli, enabling battery-free optical detection.

Keywords:

optical indicators photonic materials structural color time temperature integrators

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Area of Science:

Materials Science
Polymer Science
Optics

Background:

Polymer indicators offer autonomous optical signaling capabilities.
Structural color arises from light interaction with nanostructured polymers, reflecting specific wavelengths.

Purpose of the Study:

To review polymer systems used for creating structural color indicators.
To discuss and compare different structural color response types based on stimuli.
To outline potential applications for optical indicators based on structural colored polymers.

Main Methods:

Review of literature on polymer systems for structural color indicators.
Categorization and comparison of structural color responses to various stimuli.
Analysis of fabrication methods for nanostructured polymers.

Main Results:

Various polymer systems can be engineered to produce structural color.
Structural color indicators provide visible changes upon exposure to stimuli or analytes.
These indicators can function without external power sources (battery-free).

Conclusions:

Structural color in polymers offers a promising route for developing advanced optical indicators.
These indicators have potential applications in sensing and monitoring due to their autonomous and visual nature.