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Related Concept Videos

Diffusion on Chromatography Columns01:07

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...
Column Efficiency: Plate Theory01:10

Column Efficiency: Plate Theory

Band broadening in a chromatography column is measured by its efficiency. This is determined by the number of theoretical plates (N). Theoretical plate theory states that a separation column consists of a continuous series of imaginary plates where solute equilibration occurs between stationary and mobile phases.
A higher number of theoretical plates signifies better column efficiency and improved separation capabilities. Plate height affects bandwidth and separation quality; it is inversely...
Design of Columns under a Centric Load01:17

Design of Columns under a Centric Load

The design of columns under centric load is a fundamental aspect of structural engineering and is critical for ensuring the stability and integrity of structures. Euler's and Secant's formulas are central to understanding and calculating the critical load and deformation behaviors of columns, providing a basis for safe and effective structural design.
Euler's formula is applicable under the assumption that the column is a perfect, straight, homogenous prism, and it is operating within the...
Silica Gel Column Chromatography: Overview01:10

Silica Gel Column Chromatography: Overview

Silica gel column chromatography is a technique for separating compounds using a column packed with silica gel as the stationary phase. This method relies on differences in the polarity of compounds. Based on their polarities, compounds move between the stationary phase (silica gel) and the mobile phase (the solvent), forming discrete bands in the column.
Polar components tend to bind strongly to the silica gel, causing them to move slowly through the column. In contrast, nonpolar compounds...
Principles Of Column Chromatography01:13

Principles Of Column Chromatography

The chromatography technique was first invented in 1901 by Michael S. Tswett, a Russian botanist, to separate plant pigments using organic solvents. Further, in 1941, Archer John Porter Martin and R. L. M. Synge modified the technique by packing silica gel into a column. A mixture of amino acids was then separated on the packed column using chloroform and water mixture as the mobile phase. This was the first report on column chromatography. At present, column chromatography is a widely used...
Design of Columns under an Eccentric Load01:21

Design of Columns under an Eccentric Load

Designing columns to withstand eccentric loads is a critical aspect of structural engineering, ensuring structures can support off-center loads without failure. This design process must account for the additional normal stresses introduced by eccentric loading, which can significantly influence a column's stress distribution and overall stability. An eccentric load applied to a column induces normal stresses that can be conceptualized as a combination of stresses due to an equivalent centric...

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Scalable Stamp Printing and Fabrication of Hemiwicking Surfaces
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Published on: December 18, 2018

Dispersion in retentive pillar array columns.

Xiaohong Yan1, Qiuwang Wang, Haim H Bau

  • 1State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.

Journal of Chromatography. A
|January 19, 2010
PubMed
Summary
This summary is machine-generated.

This study models solute dispersion in chromatographic columns with ordered pillars. The volume averaging method accurately predicts dispersion, aiding in optimizing column design for better separation.

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Area of Science:

  • Chemical Engineering
  • Separation Science
  • Fluid Dynamics

Background:

  • Chromatographic separations rely on understanding solute dispersion.
  • Ordered pillar arrays are used in chromatography to enhance separation efficiency.
  • Accurate modeling of dispersion is crucial for optimizing chromatographic column design.

Purpose of the Study:

  • To develop and validate a model for estimating the Taylor-Aris dispersion tensor in columns with ordered pillars.
  • To investigate the influence of various parameters on solute dispersion.
  • To identify key contributors to dispersion for improved chromatographic performance.

Main Methods:

  • Application of the volume averaging method to derive closure equations.
  • Solving equations within a unit cell using periodic boundary conditions.
  • Comparison of model predictions with direct numerical simulations and experimental data.

Main Results:

  • The dispersion tensor was obtained as a function of Peclet number, pillar characteristics, partition coefficient, and mass transfer resistance.
  • Contributions from velocity profile, wall adsorption, and mass transfer resistance were quantified.
  • Favorable agreement was achieved between model predictions and simulation/experimental results.

Conclusions:

  • The volume averaging method provides a reliable approach for modeling dispersion in pillar-structured chromatographic columns.
  • Pillar shape and pattern significantly impact the longitudinal dispersion coefficient.
  • The developed model can guide the design of more efficient chromatographic separations.