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Synthesis and Characterization of Supramolecular Colloids
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Imbibition kinetics of spherical colloidal aggregates
A Debacker1, S Makarchuk2, D Lootens3
1IPCMS/CNRS 23 rue du Loess, 67034 Strasbourg, France and Sika, Tüffenwies 16, CH-8048 Zürich, Switzerland.
Physical Review Letters
|July 26, 2014
Summary
The study reveals three distinct stages in solvent imbibition into colloidal particle aggregates. Initially, air compression halts solvent flow until degassing allows complete infiltration.
Area of Science:
- Colloid and Surface Science
- Fluid Dynamics in Porous Media
- Materials Science
Background:
- Understanding solvent penetration into porous materials is crucial for applications like drug delivery and oil recovery.
- Colloidal aggregates present complex pore structures influencing fluid transport dynamics.
- Previous studies often simplify pore geometry or solvent behavior.
Purpose of the Study:
- To investigate the kinetics and mechanisms of solvent imbibition in millimeter-sized colloidal particle aggregates.
- To identify and characterize distinct regimes governing the imbibition process.
- To elucidate the role of entrapped air and capillary pressure in controlling solvent flow.
Main Methods:
- Experimental study of imbibition using a wetting pure solvent and millimeter-sized aggregates of 300 nm diameter colloidal particles.
- Monitoring solvent penetration and pressure changes over time.
- Analysis of three distinct imbibition regimes based on experimental observations.
Main Results:
- Observed three successive imbibition regimes: air compression, interface pinning with degassing, and final infiltration.
- Identified solvent stoppage due to compressed air pressure equaling capillary pressure.
- Demonstrated that degassing allows for renewed imbibition driven by a reduced excess pressure.
Conclusions:
- Solvent imbibition in colloidal aggregates is a multi-stage process governed by interplay between air compression, capillary forces, and degassing.
- The observed regimes provide a detailed understanding of fluid dynamics in complex porous structures.
- This research offers insights into controlling and optimizing fluid infiltration in particulate systems.
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