A Hierarchical Model for Longitudinal and Intraparticle Diffusion Coefficients in Liquid Chromatography
Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide The model for the effective longitudinal diffusion coefficient D eff, recently derived from the two-zone moment analysis approach, is adapted to predict the intraparticle diffusion coefficient D part of the general rate model for chromatography. The model for D part, coupled with the model for D eff, allows us to predict with great accuracy numerical data for D eff obtained by solving the detailed diffusion-adsorption transport model, via the Brenner–Adler method of moments, in different 2D and 3D hierarchical retentive porous structures. The proposed models make explicit the dependence of D eff and D part on the obstruction factors of the macroporous and mesoporous zone, internal and external porosity, equilibrium constant, specific surface area, and surface diffusion coefficient. Detailed numerical simulations also allowed us to verify the inaccuracy of the parallel-connection model for D part when surface diffusion in the stationary phase layer contributes significantly to the transport of the analyte in the mesoporous zone.
Source: Analytical Chemistry
Authors: Alessandra Adrover, Gert Desmet
Institutions: Sapienza University of Rome, Vrije Universiteit Brussel
Language: English
Subfield: Spectroscopy
Field: Chemistry
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W4414409168