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Clouding observed for surface active, mPEG-grafted silica nanoparticles.
Sanna Björkegren1,2, Lars Nordstierna1, Andreas Sundblom2
1Department of Chemistry and Chemical Engineering, Chalmers University of Technology SE-412 96 Göteborg Sweden.
RSC Advances
|May 6, 2022
Summary
Silica nanoparticle suspensions exhibit temperature-dependent clouding due to phase separation. This behavior, influenced by poly(ethylene glycol) chain conformation and environmental factors, offers new ways to control Pickering emulsion properties.
Area of Science:
- Colloid and Surface Science
- Materials Science
Background:
- Poly(ethylene glycol) (PEG) grafted silica nanoparticles are utilized in various applications.
- Understanding nanoparticle interactions is crucial for controlling suspension properties.
Purpose of the Study:
- To investigate the temperature-dependent phase-separation (clouding) behavior of silica nanoparticles functionalized with methyl-poly(ethylene glycol) silane.
- To explore the influence of interparticle interactions and PEG chain conformation on cloud points.
- To determine the effect of electrolyte concentration and pH on these phenomena.
Main Methods:
- Preparation of silica nanoparticles surface-functionalized with methyl-poly(ethylene glycol) silane.
- Observation and analysis of temperature-dependent phase-separation (clouding).
- Systematic variation of electrolyte concentration and pH to study their effects.
Main Results:
- Observed temperature-dependent phase-separation in the nanoparticle suspensions.
- Demonstrated that interparticle interactions and PEG chain conformation significantly influence cloud points.
- Showed that electrolyte concentration and pH can be used to control the clouding behavior.
Conclusions:
- The study elucidates the mechanisms behind temperature-dependent clouding in functionalized silica nanoparticle suspensions.
- Findings provide a basis for tuning the properties of these suspensions through controlled environmental conditions.
- These insights pave the way for novel applications in Pickering emulsion technology.
