Four reversible and reconfigurable structures for three-phase emulsions: extended morphologies and applications

Area of Science:

• Colloid and Interface Science
• Materials Science
• Chemical Engineering

Background:

• Three-phase emulsions exhibit complex interfacial phenomena.
• Controlling emulsion morphology is crucial for various applications.
• Reversible transformations between emulsion shapes remain a significant challenge.

Purpose of the Study:

• To classify and achieve controllable, reversible transformations between four distinct morphologies of three-phase emulsions.
• To demonstrate the application of these dynamic emulsion structures in reaction control.

Main Methods:

• Theoretical analysis to select appropriate liquid systems for specific morphologies.
• Utilizing a microfluidic device to generate monodispersed droplets with desired shapes.
• In-situ observation of morphology transformations by changing the ambient solution.
• Developing a droplet-based on-off switch to control phase evaporation.

Main Results:

• Successfully classified and formed four distinct morphologies in three-phase emulsions.
• Achieved systematic and reversible in-situ transformations between all four morphologies.
• Demonstrated the ability to initiate and quench phase evaporation using the engineered droplet structures.

Conclusions:

• The study presents a novel method for creating and manipulating complex emulsion morphologies.
• The reversible and switchable control of these emulsions offers a new paradigm for multiphase reaction management.
• This work provides a foundation for developing advanced responsive materials and processes.