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Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics

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Microdroplets can act as electrochemical cells.

Christian F Chamberlayne¹, Richard N Zare¹

¹Department of Chemistry, Stanford University, Stanford, California 94305, USA.

The Journal of Chemical Physics

|February 9, 2022

Summary

Microdroplets store potential energy in their electric double layers (EDLs), which can drive chemical reactions like tiny electrochemical cells. Calculations show effective voltages up to 111 mV, offering new possibilities for microscale chemistry.

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Published on: August 4, 2023

Area of Science:

Physical Chemistry
Electrochemistry
Colloid Science

Background:

Water microdroplets in air or oil develop an electric double layer (EDL) due to ion adsorption.
Understanding the energy stored within these EDLs is crucial for microscale chemical applications.

Purpose of the Study:

To calculate ion gradients and potential energy within microdroplets at equilibrium.
To investigate the utilization of this stored energy to drive chemical reactions.
To analyze the impact of water autoionization and buffer equilibria on EDL energy.

Main Methods:

Developed a continuum model balancing electromigration and diffusion of ions.
Included calculations for ion gradients, considering water autoionization and buffer equilibria.
Calculated potential energy stored within the EDL.

Main Results:

Effective voltages as high as 111 mV were calculated for microdroplets with low surface charge density.
Identified two sources of potential energy: EDL electrostatic energy and coupled chemical equilibria shifts.
Demonstrated how water autoionization can be coupled to EDL energy, leading to net ion recombination.

Conclusions:

Microdroplets can store significant potential energy in their EDLs, usable for driving chemical reactions.
The developed calculational method is versatile and applicable to various microdroplet systems.
This work provides a framework for understanding and harnessing microdroplet electrochemistry for chemical transformations.