Related Experiment Video
Updated: Jul 6, 2026
12:23
Real-time Monitoring of Ligand-receptor Interactions with Fluorescence Resonance Energy Transfer
Published on: August 20, 2012
14.0K
Single-Particle Polydiacetylene Sensors: Harnessing Monomer Reservoirs for Reconfigurable Chromic Architectures
Chetan Revadekar1, Inwoong Heo1, Jong-Man Kim2
1Department of Chemical Engineering (BK21 FOUR Integrated Engineering Program), Kyung Hee University, Yongin 17104, South Korea.
Accounts of Chemical Research
|May 5, 2026
Summary
Microscale polydiacetylene (PDA) particles with internal monomer reservoirs offer novel chromic sensing capabilities. This monomer mobility enables dynamic structural changes for enhanced color and fluorescence responses to stimuli.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Polydiacetylene (PDA) materials exhibit chromism, changing color/fluorescence in response to stimuli.
- Conventional PDA chromism is linked to backbone distortion and packing.
- Microscale PDA particles possess a unique structure with unpolymerized monomer reservoirs.
Purpose of the Study:
- To explore the chromic behavior of microscale PDA particles by focusing on their internal monomer reservoir.
- To demonstrate how monomer mobility and interfacial engineering can be leveraged for advanced sensing applications.
- To provide a single-particle perspective on PDA chromism and its potential for sensor design.
Main Methods:
- Emulsion-based and microfluidic synthesis of microscale PDA particles.
- Optical tweezers for single-particle manipulation and real-time observation at fluid-fluid interfaces.
- Fabrication of core-shell (PDA@PDMS) and Janus PDA microparticles.
- Microfluidic encapsulation for creating biocompatible PDA beads.
Main Results:
- Unpolymerized monomers within PDA particles can dissolve, migrate, and repolymerize, creating new chromic pathways.
- Single-particle experiments revealed stimulus-induced chromic fronts and internal voids.
- Designed PDA@PDMS particles showed solvent-driven monomer redistribution and dual-region chromic signatures.
- Janus PDA microparticles exhibited directional and ratiometric sensing based on differential responses.
- Alginate-encapsulated PDA beads demonstrated polarity-selective solvatochromism.
Conclusions:
- The dynamic monomer reservoir in microscale PDA particles is a key design feature for tunable chromic sensing.
- Confinement and interface engineering enable molecular-scale reconfiguration for device-level performance.
- This single-particle approach provides mechanistic insights for developing advanced, semireversible, and directional sensors.
- The principles demonstrated are adaptable to other chromic conjugated polymer systems.
