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Diffusion on Chromatography Columns

Diffusion on Chromatography Columns

In column chromatography, when an analyte is introduced as a narrow band at the top of the column, the solutes begin to separate and broaden, developing a Gaussian profile. This broadening occurs due to various factors, such as longitudinal diffusion.
Longitudinal diffusion occurs when the solute molecules in the mobile phase diffuse from the more concentrated center of the chromatographic band to the more dilute regions on either side, both towards and against the flow direction. This...

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Updated: Jun 28, 2026

Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique

Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique

Published on: June 12, 2015

Diffusion coefficient measurements in microfluidic devices.

Christopher T Culbertson¹, Stephen C Jacobson, J Michael Ramsey

¹Oak Ridge National Laboratory, Chemical Sciences Division, P.O. Box 2008, Oak Ridge, TN 37831-6142, USA.

|October 31, 2008

Summary

This summary is machine-generated.

This study compared four diffusion coefficient measurement methods using rhodamine 6G. Dynamic methods showed higher values than static imaging in aqueous solutions, indicating potential adsorption effects.

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Area of Science:

Analytical Chemistry
Physical Chemistry
Chemical Engineering

Background:

Accurate measurement of diffusion coefficients is crucial for understanding molecular transport.
Microfluidic devices offer precise control over experimental conditions.
Analyte-wall interactions can influence diffusion measurements.

Purpose of the Study:

To compare the accuracy and reliability of four distinct methods for measuring diffusion coefficients.
To investigate the impact of analyte-wall interactions on diffusion measurements in microfluidic devices.
To validate dynamic and static imaging methods for diffusion coefficient determination.

Main Methods:

Utilized a microfabricated fluidic device for diffusion coefficient measurements.
Employed four methods: static imaging, stopped flow, E-field, and length methods.
Analyte used was rhodamine 6G, with additional measurements for other fluorescent molecules.

Main Results:

Static imaging, stopped flow, and E-field methods yielded consistent diffusion coefficients for rhodamine 6G in methanol/aqueous buffer, aligning with literature values.
In 100% aqueous conditions, dynamic methods yielded diffusion coefficients 11% higher than static imaging.
Diffusion coefficients were successfully measured for various fluorescent dyes and biomolecules using static imaging.

Conclusions:

Dynamic diffusion measurement methods may overestimate coefficients in aqueous solutions due to analyte-wall adsorption.
Static imaging provides reliable diffusion coefficient measurements when adsorption is minimized.
Microfluidic platforms are effective for comparative diffusion coefficient analysis.