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Nanoliter droplet viscometer with additive-free operation.
Eric Livak-Dahl1, Jaesung Lee, Mark A Burns
1Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
Lab on a Chip
|November 30, 2012
Summary
This study introduces a microfluidic method for precise viscosity measurements using only nanoliter sample volumes. The technique accurately determines fluid viscosity without labels, offering a significant advancement for various analytical applications.
Area of Science:
- Analytical Chemistry
- Fluid Dynamics
- Microfluidics
Background:
- Viscosity measurement is crucial for medical diagnosis, pharmaceuticals, and industry.
- Traditional methods require large sample volumes, limiting applications.
- Microfluidic approaches offer miniaturization but often need labels or tracers.
Purpose of the Study:
- To develop a label-free microfluidic method for accurate viscosity measurement.
- To enable viscosity analysis with nanoliter-scale sample volumes.
- To overcome limitations of existing microfluidic viscometers.
Main Methods:
- Utilized droplet-based microfluidics with water-in-oil systems.
- Observed the flow rate of a sample plug through a microfluidic constriction.
- Applied controlled pressure to drive the sample plug flow.
Main Results:
- Achieved accurate and precise viscosity measurements of ~30 nL sample plugs.
- Reported an average measurement error of 6.6% and relative standard deviation of 2.8%.
- Successfully measured viscosities up to 101 mPa s for glycerol-based samples.
Conclusions:
- The developed method provides a sensitive and efficient way to measure viscosity.
- Applicable to samples with viscosities higher than the continuous phase.
- Enables high-throughput viscosity analysis with minimal sample consumption.
