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Surface diffusion in reversed-phase liquid chromatography
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DOI：10.1016/j.chroma.2009.12.054.png)
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摘要
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More than 40 years ago, Giddings pointed out in Dynamics of Chrornatography that surface diffusion should become an important research topic in the kinetics of chromatographic phenomena However, few studies on Surface diffusion in adsorbents used in chromatography were published since then. Most scientists use ordinary rate equations to Study mass transfer kinetics in chromatography. They take no account of surface diffusion and overlook the significant contributions of this mass transfer process to chromatographic behavior and to column efficiency at high mobile phase flow rate. Only recently did the significance Of Surface diffusion in separation processes begin to be recognized in connection with the development of new techniques of fist flow, high efficiency chromatography In this review, we revisit the reports on experimental data oil surface diffusion and introduce a surface-restricted molecular diffusion model. derived as a first approximation for the mechanism of surface diffusion, Oil the basis of the absolute rate theory. We also explain how this model accounts for many intrinsic characteristics of surface diffusion that cannot properly be explained by the conventional models Of Surface diffusion (C) 2009 Elsevier B.V. All rights reserved.
Keyword:
Surface diffusion
Molecular diffusivity
Pore diffusion
Mass transfer kinetics
RPLC
HETP equations
Hole-making process
Jumping process
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4
论文数:
3.2W
被引数:
5.0W
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Restricted diffusion model for surface diffusion in reversed-phase liquid chromatography.png)
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