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Capillary-based Centrifugal Microfluidic Device for Size-controllable Formation of Monodisperse Microdroplets
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Chemically induced coalescence in droplet-based microfluidics.
Ilke Akartuna1, Donald M Aubrecht, Thomas E Kodger
1School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, USA. weitz@seas.harvard.edu.
Lab on a Chip
|December 25, 2014
Summary
Researchers developed a new microfluidic technique to merge water-in-oil droplets using a specific solvent. This method offers an efficient alternative for droplet coalescence in microfluidic systems.
Area of Science:
- Fluid dynamics
- Materials science
- Chemical engineering
Background:
- Droplet coalescence is crucial for various applications, including drug delivery and materials synthesis.
- Existing methods for droplet merging can be complex or inefficient.
- Surfactant-stabilized droplets require specific conditions for controlled coalescence.
Purpose of the Study:
- To introduce a novel microfluidic method for efficient droplet coalescence.
- To demonstrate the use of a poor solvent to induce merging of water-in-fluorocarbon oil droplets.
- To provide an alternative technique for controlled droplet fusion.
Main Methods:
- A microfluidic device was utilized to handle and manipulate droplets.
- Perfluorobutanol, a poor solvent for the surfactant, was locally introduced.
- The solvent induced cohesion between droplet interfaces, leading to coalescence.
Main Results:
- The new method successfully coalesced pairs of surfactant-stabilized water-in-fluorocarbon oil droplets.
- The efficiency of this technique was found to be comparable to existing droplet coalescence methods.
- Local solvent addition proved effective in triggering droplet merging.
Conclusions:
- A new, efficient microfluidic method for droplet coalescence has been established.
- Perfluorobutanol serves as an effective agent for inducing droplet merging.
- This technique offers a valuable alternative for applications requiring precise control over droplet fusion.
