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Optical chromatographic sample separation of hydrodynamically focused mixtures
A Terray1, C G Hebert1, S J Hart2
1Bio/Analytical Chemistry, Chemistry Division, Naval Research Laboratory , Code 6112, 4555 Overlook Ave. S.W., Washington, District of Columbia 20375, USA.
Biomicrofluidics
|January 2, 2015
Summary
Optical chromatography uses laser and fluid forces for particle separation. This study demonstrates precise fractionation of closely related particles using a matched microfluidic channel and laser system.
Area of Science:
- Optics
- Fluid Dynamics
- Materials Science
Background:
- Optical chromatography separates particles based on optical and fluid drag forces.
- Particle properties like size, shape, and refractive index influence separation equilibrium.
- Microfluidic devices offer precise control over particle manipulation.
Purpose of the Study:
- To demonstrate a method for ultra-fine particle fractionation using optical chromatography.
- To investigate the role of microfluidic channel diameter and laser focusing in separation.
- To achieve complete separation of closely related particles in a mixed sample.
Main Methods:
- Utilizing a microfluidic platform with a precisely matched channel diameter to the focusing laser.
- Employing hydrodynamic focusing to align particles within the microfluidic channel.
- Injecting and separating mixtures of polystyrene and poly(methyl methacrylate) spheres.
Main Results:
- Achieved complete separation of different polymer spheres (polystyrene and poly(methyl methacrylate)).
- Demonstrated successful fractionation of polystyrene spheres with diameter differences less than 0.5 μm.
- Validated the system's capability for ultra-fine particle separation.
Conclusions:
- Matching microfluidic channel diameter to laser diameter enables precise particle fractionation.
- The developed microfluidic platform is effective for separating closely related particles.
- This technique provides a framework for advanced ultra-fine separation applications.
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