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pH-Responsive Pickering Foams Generated by Surfactant-Free Soft Hydrogel Particles
Dalin Wu1, Voichita Mihali1, Andrei Honciuc1
1Institute of Chemistry and Biotechnology , Zurich University of Applied Sciences , Einsiedlerstrasse 31 , 8820 Waedenswil , Switzerland.
Langmuir : the ACS Journal of Surfaces and Colloids
|December 13, 2018
Summary
Stimuli-responsive Pickering foams were created using biocompatible hydrogel particles. These pH-responsive foams can be formed or broken by adjusting the solution
Area of Science:
- Materials Science
- Colloid and Surface Chemistry
- Biomaterials Engineering
Background:
- Pickering foams, stabilized by particles, offer enhanced stability.
- Stimuli-responsive Pickering foams can be controlled by external triggers, enabling practical applications.
- Surfactant-free, biocompatible particles are desirable for advanced foam applications.
Purpose of the Study:
- To synthesize and characterize pH-responsive poly[2(diethylamino)ethyl methacrylate] (PDEAEMA) hydrogel particles (HGPs).
- To investigate the formation, stability, and deconstruction of Pickering foams stabilized by PDEAEMA HGPs.
- To explore the influence of pH and HGP concentration on foam properties.
Main Methods:
- Emulsion polymerization for synthesizing PDEAEMA HGPs.
- Transmission Electron Microscopy (TEM), Dynamic Light Scattering (DLS), and zeta potential measurements for HGP characterization.
- Foam formation and stability experiments under varying pH conditions.
Main Results:
- Stable Pickering foams were formed at pH > 4.0, while no foams formed at pH ≤ 4.0.
- Foam height, size, and bubble size distribution were significantly influenced by pH and HGP concentration.
- Foams formed in basic solutions could be effectively deconstructed by lowering the pH to below 4.0.
- SEM analysis revealed that dried foam lamellas consisted of HGP monolayers or multilayers.
Conclusions:
- pH-responsive PDEAEMA HGPs can effectively stabilize Pickering foams.
- The pH-triggered formation and deconstruction of these foams demonstrate their stimuli-responsive nature.
- These findings highlight the potential of PDEAEMA-stabilized Pickering foams in applications requiring controlled foam behavior.
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