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Particle Separation from Liquid Marbles by the Viscous Folding of Liquid Films
Yijun Feng1, Guohua Liu1, Jinliang Xu1
1Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization, North China Electric Power University, Beijing 102206, P.R. China.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 4, 2022
Summary
Separating particles from fluid interfaces is challenging. This study demonstrates a novel method using liquid marble drop impacts on soap films to achieve tunable particle stripping via viscous separation, controlled by impact parameters.
Area of Science:
- Soft matter physics
- Colloid and surface chemistry
Background:
- Particle separation from fluid interfaces presents significant challenges due to high capillary energy.
- Existing methods often require physicochemical modification or electrostatic manipulation.
Purpose of the Study:
- To investigate particle separation from fluid interfaces using the dynamic impact of liquid marbles on soap films.
- To explore a novel, tunable method for particle stripping independent of surface chemistry.
Main Methods:
- Experimental investigation of liquid marble (droplet with particles) collisions with soap films.
- Analysis of separation dynamics including bouncing, coalescence, stripping, and tunneling.
- Thermodynamic analysis and control of separation through selectable impact parameters.
Main Results:
- Robust particle stripping (separation) achieved through viscous separation during drop impact.
- Tunable separation range demonstrated by controlling impact parameters.
- Separation thresholds determined by the balance of kinetic energy, surface energy, and viscous dissipation.
- Mechanical cracking of particle crust explained by interfacial stress and viscous force coupling.
Conclusions:
- Fast dynamics of drop impact on soap films offer a viable method for particle separation from interfaces.
- Viscous separation mechanism is controllable and tunable, providing a new approach for soft matter research.
- Understanding the energy dynamics is key to optimizing particle separation processes.
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