Diaphragm-based microfluidic platforms for reconfigurable sample manipulation: from enrichment to activated sorting

Area of Science:

• Microfluidics and Lab-on-a-Chip Technologies
• Biomedical Engineering
• Analytical Chemistry

Background:

• Microfluidic systems rely on precise sample manipulation for analytical performance.
• Existing methods like passive separations and field-based techniques have limitations in tunability and complexity.
• Diaphragm-based actuation offers a novel solution by dynamically reconfiguring microchannel geometry.

Purpose of the Study:

• To consolidate diaphragm-actuated microfluidic strategies as a unified framework for active sample manipulation.
• To review and benchmark various diaphragm actuation schemes and materials.
• To explore emerging directions for advanced lab-on-a-chip applications.

Main Methods:

• Review of diaphragm-based microfluidic strategies for sample enrichment and activated sorting.
• Benchmarking of diaphragm materials, geometries, and actuation schemes (pneumatic, piezoelectric, etc.).
• Evaluation against performance metrics including pressure-deflection transfer, latency, efficiency, selectivity, and gating accuracy.

Main Results:

• Diaphragm actuation enables sub-second fluidic control for enrichment (trapping, focusing, nanoconfinement) and sorting (label-based, label-free, hybrid).
• Various actuation schemes and materials are compared based on quantitative performance metrics.
• Identified key performance indicators for evaluating diaphragm-actuated systems.

Conclusions:

• Diaphragm-based actuation provides a versatile platform for autonomous, label-free, and high-content lab-on-a-chip systems.
• Emerging directions include smart materials, feedback control, scalable fabrication, and AI integration.
• This approach bridges sample enrichment and activated sorting for next-generation diagnostics and biomanufacturing.