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Structuring colloidal gels via micro-bubble oscillations.
1Institute for Theoretical Physics, Center for Extreme Matter and Emergent Phenomena, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands. k.w.torre@uu.nl.
Soft Matter
|March 29, 2023
Summary
Oscillating microbubbles can locally order colloidal gels, forming hexagonal structures. Simulations matched experimental short-range ordering but not the long-range effects, suggesting fluid flow is key for future models.
Area of Science:
- Soft Matter Physics
- Colloidal Science
- Computational Physics
Background:
- Colloidal gels are complex fluids with arrested dynamics.
- Precise control over micromechanical and rheological properties is crucial.
- Acoustic modulation of microbubbles can induce local ordering in gels.
Purpose of the Study:
- To investigate the mechanical influence of oscillating microbubbles on colloidal gel structure.
- To understand the short-range structural modifications induced by microbubble oscillations.
Main Methods:
- Brownian dynamics simulations were employed.
- The focus was on the colloidal gel structure adjacent to the microbubble.
- Simulations modeled the effect of an oscillating microbubble.
Main Results:
- Hexagonal-close-packed structures were observed around the microbubble.
- The range of ordering was comparable to the microbubble's oscillation amplitude.
- Simulations did not reproduce the long-range structural modifications seen in experiments.
Conclusions:
- Microbubble oscillations induce local ordering in colloidal gels.
- Current simulation models may need to incorporate long-range effects like fluid flow.
- Further research should explore the role of fluid dynamics in microbubble-induced gel restructuring.
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