Search Results - "Holtzel, Alexandra"

Surface Diffusion of Aromatic Hydrocarbon Analytes in Reversed-Phase Liquid Chromatography by Rybka, Julia, Höltzel, Alexandra, Tallarek, Ulrich

“…In reversed-phase liquid chromatography (RPLC), retained analytes can diffuse faster along the hydrophobic surface of the stationary phase than when dissolved…”
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Insights from molecular simulations about dead time markers in reversed-phase liquid chromatography by Trebel, Nicole, Höltzel, Alexandra, Steinhoff, Andreas, Tallarek, Ulrich

“…•The stationary-phase limit in RPLC is discussed from a molecular-level perspective.•Simulations show how different solutes interact with the chromatographic…”
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Solute Sorption, Diffusion, and Advection in Macro–Mesoporous Materials: Toward a Realistic Bottom-Up Simulation Strategy by Tallarek, Ulrich, Hlushkou, Dzmitry, Höltzel, Alexandra

“…We present a general bottom-up strategy to simulate solute transport through macro–mesoporous adsorbents with functionalized surfaces. The strategy is…”
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Confinement Effects on Distribution and Transport of Neutral Solutes in a Small Hydrophobic Nanopore by Trebel, Nicole, Höltzel, Alexandra, Tallarek, Ulrich

“…Molecular dynamics simulations are used to study confinement effects in small cylindrical silica pores with extended hydrophobic surface functionalization as…”
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Molecular Dynamics Study of the Relation between Analyte Retention and Surface Diffusion in Reversed-Phase Liquid Chromatography by Rybka, Julia, Höltzel, Alexandra, Steinhoff, Andreas, Tallarek, Ulrich

“…In reversed-phase liquid chromatography (RPLC), analyte molecules retained on the hydrophobic stationary phase can undergo fast surface diffusion within an…”
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Multiscale Simulation of Diffusion in Porous Media: From Interfacial Dynamics to Hierarchical Porosity by Tallarek, Ulrich, Hlushkou, Dzmitry, Rybka, Julia, Höltzel, Alexandra

“…We present a multiscale simulation approach to derive effective bed diffusion coefficients (D bed) in hierarchically structured, macro/mesoporous materials…”
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Stationary-Phase Contributions to Surface Diffusion in Reversed-Phase Liquid Chromatography: Chain Length versus Ligand Density by Rybka, Julia, Höltzel, Alexandra, Trebel, Nicole, Tallarek, Ulrich

“…Fast surface diffusion in reversed-phase liquid chromatography (RPLC) describes a complex phenomenon that exists in a narrow ditch region where the…”
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Mobile-Phase Contributions to Organic-Solvent Excess Adsorption and Surface Diffusion in Reversed-Phase Liquid Chromatography by Steinhoff, Andreas, Höltzel, Alexandra, Trebel, Nicole, Tallarek, Ulrich

“…Fast transport of retained analytes in reversed-phase liquid chromatography occurs through surface diffusion in the organic-solvent (OS)-enriched interfacial…”
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The relative importance of the adsorption and partitioning mechanisms in hydrophilic interaction liquid chromatography by Gritti, Fabrice, Höltzel, Alexandra, Tallarek, Ulrich, Guiochon, Georges

“…•Original model of effective diffusion along packed beds of mesoporous particles.•Model enables differentiation between adsorption and partitioning in…”
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Influence of the Particle Size Distribution on Hydraulic Permeability and Eddy Dispersion in Bulk Packings by Daneyko, Anton, Höltzel, Alexandra, Khirevich, Siarhei, Tallarek, Ulrich

“…The narrow particle size distribution (PSD) of certain packing materials has been linked to a reduced eddy dispersion contribution to band broadening in…”
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Consequences of Cylindrical Pore Geometry for Interfacial Phenomena in Reversed-Phase Liquid Chromatography by Trebel, Nicole, Höltzel, Alexandra, Lutz, Julia K, Tallarek, Ulrich

“…The interfacial phenomena behind analyte separation in a reversed-phase liquid chromatography column take place nearly exclusively inside the silica mesopores…”
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Hindered Diffusion in Ordered Mesoporous Silicas: Insights from Pore-Scale Simulations in Physical Reconstructions of SBA-15 and KIT‑6 Silica by Reich, Stefan-Johannes, Svidrytski, Artur, Höltzel, Alexandra, Florek, Justyna, Kleitz, Freddy, Wang, Wu, Kübel, Christian, Hlushkou, Dzmitry, Tallarek, Ulrich

“…The performance of SBA-15 and KIT-6 silicas as ordered mesoporous supports for heterogeneous catalysis, selective adsorption, and controlled drug release…”
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Morphology and separation efficiency of a new generation of analytical silica monoliths by Hormann, Kristof, Müllner, Tibor, Bruns, Stefan, Höltzel, Alexandra, Tallarek, Ulrich

“…► A new generation of analytical silica monoliths is presented. ► Macromorphology is reconstructed using confocal laser scanning microscopy. ► Smaller…”
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Ionic conductance of nanopores in microscale analysis systems: Where microfluidics meets nanofluidics by Höltzel, Alexandra, Tallarek, Ulrich

“…In this tutorial review we illustrate the origin and dependence on various system parameters of the ionic conductance that exists in discrete nanochannels as…”
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A Molecular Dynamics Study on the Partitioning Mechanism in Hydrophilic Interaction Chromatography by Melnikov, Sergey M., Höltzel, Alexandra, Seidel-Morgenstern, Andreas, Tallarek, Ulrich

“…The retention mechanism in hydrophilic interaction chromatography is supposed to involve partitioning of analytes between a mostly organic mobile phase and a…”
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Hindrance Factor Expression for Diffusion in Random Mesoporous Adsorbents Obtained from Pore-Scale Simulations in Physical Reconstructions by Reich, Stefan-Johannes, Svidrytski, Artur, Hlushkou, Dzmitry, Stoeckel, Daniela, Kübel, Christian, Höltzel, Alexandra, Tallarek, Ulrich

“…Hindered diffusion of solutes is the rate-limiting step in many processes for which random porous media play a central role as providers of adsorbing or…”
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Adsorption of Water–Acetonitrile Mixtures to Model Silica Surfaces by Melnikov, Sergey M., Höltzel, Alexandra, Seidel-Morgenstern, Andreas, Tallarek, Ulrich

“…The retention mechanism of hydrophilic interaction chromatography relies on analyte partitioning from a mostly organic water–acetonitrile (W/ACN) mobile phase…”
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From Pore Scale to Column Scale Dispersion in Capillary Silica Monoliths by Hlushkou, Dzmitry, Bruns, Stefan, Höltzel, Alexandra, Tallarek, Ulrich

“…We study time and length scales of eddy dispersion in 100 μm i.d. capillary silica monoliths. First, the monolith’s macropore morphology was visualized over…”
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Composition, Structure, and Mobility of Water−Acetonitrile Mixtures in a Silica Nanopore Studied by Molecular Dynamics Simulations by Melnikov, Sergey M, Höltzel, Alexandra, Seidel-Morgenstern, Andreas, Tallarek, Ulrich

“…To investigate the effect of the nanoscale confinement on the properties of a binary aqueous−organic solvent mixture, we performed molecular dynamics…”
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How Ternary Mobile Phases Allow Tuning of Analyte Retention in Hydrophilic Interaction Liquid Chromatography by Melnikov, Sergey M, Höltzel, Alexandra, Seidel-Morgenstern, Andreas, Tallarek, Ulrich

“…An attractive yet hardly explored feature of hydrophilic interaction liquid chromatography (HILIC) is the tuning of analyte retention through the addition of…”
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