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Polymer-mediated colloidal stability: on the transition between adsorption and depletion
Álvaro González García1, Marjolijn M B Nagelkerke1, Remco Tuinier2
1Van 't Hoff Laboratory for Physical and Colloid Chemistry, Department of Chemistry & Debye Institute, Utrecht University, Padualaan 8, 3584 CH, Utrecht, the Netherlands; Laboratory of Physical Chemistry, Department of Chemical Engineering and Chemistry & Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, the Netherlands.
Advances in Colloid and Interface Science
|December 10, 2019
Summary
Adding polymers to colloidal dispersions changes how particles interact. Researchers developed a model for predicting colloid-polymer mixture behavior, finding that neutral adsorption enables dense, stable mixtures.
Area of Science:
- Colloid and Polymer Science
- Soft Matter Physics
Background:
- Polymer addition to colloidal dispersions alters inter-colloid interactions.
- Positive (adsorption) and negative (depletion) adsorption significantly impact colloidal phase behavior.
Purpose of the Study:
- To develop a theoretical framework for predicting colloid-polymer mixture phase behavior.
- To investigate the role of polymer-colloid affinity and adsorption types (positive, negative, neutral) on phase transitions.
Main Methods:
- Theoretical modeling of colloid-polymer interactions.
- Analysis of phase diagrams under varying polymer adsorption conditions.
- Focus on the phenomenon of neutral adsorption.
Main Results:
- A theoretical framework was established to predict phase behavior based on polymer-colloid affinity.
- A stable-unstable-restabilisation transition was observed in phase diagrams near neutral adsorption.
- Neutral adsorption, where polymer concentration is constant near colloids, was defined.
Conclusions:
- Understanding neutral adsorption is key to controlling colloid-polymer mixture stability.
- Achieving neutral adsorption allows for the preparation of highly dense, stable colloidal systems.
- This work provides a pathway for designing advanced materials with tunable properties.
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