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High Speed Droplet-based Delivery System for Passive Pumping in Microfluidic Devices
Published on: September 2, 2009
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On-Demand Nanoliter Delivering Platform via Electrical-Activated Microdroplet Assembling.
Jianwei Zhong1, Yifu Chang2, Minhui Liang3
1School of Microelectronics, South China University of Technology, Guangzhou 511442, China.
Nano Letters
|September 10, 2025
Summary
This study presents a novel nanoliter delivery platform for high-throughput screening. It enables precise, on-demand reagent delivery and selective droplet fusion for advanced biochemical assays.
Area of Science:
- Biotechnology
- Microfluidics
- Biochemistry
Background:
- Nanoliter-scale reagent delivery is crucial for high-throughput biochemical assays.
- Existing platforms struggle with real-time control, selective fusion, and limited throughput.
Purpose of the Study:
- To develop an on-demand nanoliter delivery platform integrating electrical sensing, triggered droplet merging, and passive sorting.
- To enable selective content fusion based on biochemical criteria for enhanced assay specificity.
Main Methods:
- Utilized impedance-based content detection for droplet identification.
- Implemented electrocoalescence for triggered droplet merging.
- Employed size-dependent hydrodynamic deflection for passive droplet sorting.
Main Results:
- Achieved selective fusion of nanoliter droplets based on impedance sensing.
- Demonstrated accurate distinction of metabolically active bacterial droplets.
- Reached over 6000 events per minute with >92% postfusion purity in bacterial screening.
Conclusions:
- The platform offers label-free, high-precision, programmable nanoliter delivery.
- Enables energy-free enrichment of fused droplets.
- Shows significant potential for drug discovery, synthetic biology, and single-cell analysis.
