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Adsorbed Layer Thickness Determination for Convective-Based Media from Pressure Drop Data.

Aleš Podgornik1,2, Mark R Etzel3

  • 1University of Ljubljana , Faculty of Chemistry and Chemical Technology , Večna pot 113 , Ljubljana , Slovenia.

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Summary

This study presents a new theoretical framework to measure adsorbed layer thickness using pressure drop data, achieving high accuracy without pore geometry assumptions. Optimal conditions minimize errors, enabling precise thickness determination for various materials.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Accurate determination of adsorbed layer thickness is crucial in chromatography and materials science.
  • Existing methods often rely on assumptions about pore geometry, limiting their applicability.
  • Pressure drop measurements offer a potentially simpler, geometry-independent approach.

Purpose of the Study:

  • To develop a theoretical framework for calculating adsorbed layer thickness from pressure drop measurements.
  • To establish equations for estimating the accuracy of the derived adsorbed layer thickness.
  • To identify optimal experimental conditions for accurate thickness determination.

Main Methods:

  • Derivation of a theoretical model based on pressure drop measurements in convective-based media.
  • Development of equations to quantify measurement errors and model approximations.
  • Experimental validation using methacrylate monolithic columns, latex nanoparticles, and proteins.

Main Results:

  • A novel method for determining adsorbed layer thickness without pore geometry assumptions was established.
  • Optimal pressure drop ranges were identified to minimize error in thickness estimation.
  • The method demonstrated <10% error across a wide range of experimental conditions.
  • Subnanometer to several hundred nanometer thicknesses were accurately determined.

Conclusions:

  • Pressure drop measurement is a viable and accurate method for determining adsorbed layer thickness.
  • The developed theoretical framework and error analysis provide a robust tool for materials characterization.
  • This technique offers a versatile approach for analyzing various porous materials and adsorbed layers.