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Controlling gold nanoparticle stability with triggerable microgels
Azwan Mat Lazim1, Melanie Bradley, Julian Eastoe
1School of Chemistry, University of Bristol, Bristol BS8 1TS, UK.
Langmuir : the ACS Journal of Surfaces and Colloids
|June 26, 2010
Summary
This study shows how photodegradable surfactants and poly(2-vinyl pyridine) microgels interact, enabling controlled coflocculation and redispersal. This method efficiently recovers gold nanoparticles for recycling.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Investigating the interaction between photodegradable surfactants and poly(2-vinyl pyridine) microgels.
- Understanding charge interactions in complex colloidal systems.
Purpose of the Study:
- To explore the controlled coflocculation and redispersal of microgel-surfactant complexes.
- To assess the recovery and recycling of gold nanoparticles using this system.
Main Methods:
- Electrophoretic mobility measurements to analyze charge interactions.
- UV irradiation to induce photodegradation of the surfactant.
- Atomic absorption spectroscopy for gold nanoparticle recovery quantification.
Main Results:
- Formation of mixed poly(2-vinyl pyridine) microgel-surfactant complexes with charge reversal upon UV exposure.
- Successful coflocculation of complexes with additional microgels.
- High recovery rates (approx. 75%) of gold nanoparticles after UV-induced redispersion.
Conclusions:
- Photodegradable surfactants enable tunable phase separation and recovery of microgel-based systems.
- The developed method offers an efficient route for gold nanoparticle recovery and recycling.
- This approach has potential applications in materials separation and resource management.
