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K-Channel: A Multifunctional Architecture for Dynamically Reconfigurable Sample Processing in Droplet Microfluidics.

Steven R Doonan^1,2, Ryan C Bailey^1,2

¹Department of Chemistry, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.

Analytical Chemistry

|February 22, 2017

Summary

The novel K-channel microfluidic device enables diverse in-droplet operations like reagent injection and fluid extraction without device redesign. This versatile component streamlines high-throughput chemical analysis and biochemical manipulations.

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Area of Science:

Microfluidics
Chemical Engineering
Biotechnology

Background:

Droplet microfluidics enables high-throughput chemical analysis through miniaturized reactors.
Current microfluidic devices require specialized geometries for different operations, hindering assay optimization.
Re-engineering devices for new operations is time-consuming and costly.

Purpose of the Study:

To develop a versatile microfluidic component for diverse in-droplet operations without device modification.
To introduce the K-channel as a solution for flexible droplet manipulation.
To enable automated, high-throughput biochemical assays.

Main Methods:

Developed the K-channel, coupling cross-channel flow with segmented droplet flow.
Utilized external conditions (pressure, electric field) to control K-channel operations.
Integrated a device-embedded magnet for selective magnetic bead capture during droplet splitting.

Main Results:

K-channels perform reagent injection (0-100%), fluid extraction (0-50%), and droplet splitting (1:1-1:5).
Operations are tuned by adjusting external parameters, not device geometry.
Achieved 96% selective capture of superparamagnetic beads at ~400 Hz.
Integrated washing of magnetic beads using a second K-channel.

Conclusions:

The K-channel offers a versatile, user-friendly microfluidic component for various droplet manipulations.
Eliminates the need for architectural modifications, simplifying assay development.
Enables diverse in-droplet (bio)chemical manipulations for high-throughput applications.