Additively Manufactured Digital Microfluidic Platforms for Ion-Selective Sensing

Area of Science:

• Microfluidics
• Analytical Chemistry
• Sensor Technology

Background:

• Digital microfluidic (DMF) systems offer discrete, accurate, and automated liquid handling.
• Conventional microfluidics often require complex pumping systems and external liquid carriers.
• DMF platforms are ideal for sensing but rarely utilized for ion-selective detection.

Purpose of the Study:

• To develop an integrated DMF system for facile blending and selective detection of ions.
• To demonstrate controlled droplet manipulation for advanced analytical applications.
• To enable ion-selective sensing within a microfluidic environment.

Main Methods:

• Fabrication of an integrated DMF platform using additive manufacturing.
• Implementation of a real-time droplet motion monitoring and feedback system.
• Integration of on-chip ion-selective membranes for interference studies.

Main Results:

• Demonstrated controlled droplet manipulation, including actuation, mixing, and speed control.
• Achieved selective detection of a targeted primary ion within a concentration range of 10⁻⁶ M to 1 M.
• Investigated interference effects using blended ions on the developed platform.

Conclusions:

• The integrated DMF system provides a versatile platform for controlled ion manipulation and selective sensing.
• This approach offers a significant advancement for microfluidic-based ion detection.
• The system shows potential for various applications in chemistry and biology requiring precise ion analysis.