Controlled-pore glass as a stationary phase in chromatography

Schnabel, R.; Langer, P.

doi:10.1016/s0021-9673(01)83983-2

Cited by 35 publications

(29 citation statements)

References 40 publications

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“…Cylindrical pore models are generally considered appropriate, particularly as they should give reasonable representation of synthetic porous silicas used to generate experimental data for model validation (Schnabel and Langer 1991;Gelb and Gubbins 1998).…”

Section: Hydrate Equilibria In Cylindrical Poresmentioning

confidence: 99%

Thermodynamic prediction of clathrate hydrate dissociation conditions in mesoporous media

Llamedo

Anderson

Tohidi

2004

American Mineralogist

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We present modifications to a previously reported statistical thermodynamics model that facilitates the prediction of capillary pressure effects on hydrate equilibria in narrow pores. The model uses the Valderrama modification of the Patel and Teja Equation of State (VPT EoS) for fugacity calculations in fluid phases, while the hydrate phase is modeled using the solid solution theory of van der Waals and Platteeuw (1959), as implemented by Cole and Goodwin (1990). The Kihara model for spherical molecules is applied to calculate the potential function for hydrate-forming gases. To account for capillary pressure effects on phase fugacities, we apply a correction similar to the Poynting correction for saturated liquids. This correction can be applied to any model capable of predicting bulk (unconfined) hydrate phase equilibria. The only new parameter required is hydrate-liquid interfacial tension-values for which we have derived previously from experimental data. The model assumes cylindrical pores, although differs from the majority of existing literature models in how the curvature of the solid-liquid interface is considered; we assume a curvature of 2/r for growth and 1/r for dissociation, in accordance with accepted capillary theory. Model predictions are validated against previously published experimental hydrate dissociation data for binary CO 2 -H 2 O, CH 4 -H 2 O and ternary CH 4 -CO 2 -H 2 O systems, and newly reported data for CH 4 -H 2 O-CH 4 O (3.5 mass% methanol aqueous solutions representing the salinity of seawater) systems, confined to mesoporous silica glass. Good agreement between predictions and experimental data is observed.

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Section: Hydrate Equilibria In Cylindrical Poresmentioning

confidence: 99%

Thermodynamic prediction of clathrate hydrate dissociation conditions in mesoporous media

Llamedo

Anderson

Tohidi

2004

American Mineralogist

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“…22-39 CPG-based materials are used as chromatographic stationary phases and as an adsorption medium for a wide variety of reagents such as biological macromolecules (e.g., proteins) [22][23][24][25] and various cations. [26][27][28] CPG has been used as a solid support for immobilizing catalysts, 29,30 enzymes, 30,31 and nucleotides.…”

Section: Introductionmentioning

confidence: 99%

“…[35][36][37][38][39] CPG is porous with a surface that consists of siloxane and silanol groups. 22,40,41 Surface silanol groups (i) provide attachment sites for introducing functional groups onto the CPG surface (e.g., amine groups) and (ii) are largely responsible for the interactions between the CPG surface and the potential adsorbates. The silanol groups are of three kinds: geminal, isolated, and vicinal or hydrogen-bonded.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Dansylated Aminopropyl Controlled Pore Glass Solvated by Molecular and Ionic Liquids

et al. 2006

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We compare how (i) four ionic liquids (ILs) (1-butyl-3-methylimidazolium tetrafluoroborate ([C4mim][BF4]), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C4mim][Tf2N]), 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([C4mpy][Tf2N]), and trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide ([P(C6)3C14][Tf2N])) and (ii) two conventional molecular liquids (methanol and 1-octanol) solvate/wet luminescent organic moieties that are covalently attached to the surface of silica controlled pore glass (CPG). A series of aminopropyl CPG particles that have been covalently tagged with the solvatochromic fluorescent probe group dansyl were used in this study. The results demonstrate that ILs solvate/wet the silica surface differently in comparison to molecular liquids (MLs). Specifically, when comparing ILs and MLs that appear to solvate the free probe, dansylpropylsulfonamide (DPSA), equally in solution, we find that ILs do not solvate/wet the silica surfaces as well as the corresponding MLs. The cation component in these ILs is the significant factor in how the ILs solvate/wet silica surfaces. Solvation/wetting of surface-bound species at a silica surface depends on the cation size. Chlorosilane end-capping of the surface silanol and amine residues attenuates the cation's affects.

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“…The remaining glass contains colloidal silica particles, which are removed by treatment with NaOH followed by washing with water. The final glass has a porosity between 50 and 75%, an average pore size between 4.5 and 400 nm, and surface area between 10 and 350 m 2 /g (Schnabel and Langer, 1991).…”

Section: Models and Simulation Methodsmentioning

confidence: 99%

Adsorption in Controlled-Pore Glasses: Comparison of Molecular Simulations with a Mean-Field Lattice Gas Model

Gelb

Salazar

2005

Adsorption

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We consider the possible quantitative application of a lattice-gas model approach to the calculation of adsorption isotherms. In order to validate such application, we use the lattice-gas approach to solve for the adsorption and desorption isotherms in model controlled-pore glasses that have previously been the subject of an extensive series of Grand Canonical Monte Carlo simulations. We find that the lattice-gas model augmented with longer-ranged interactions provides a quite good account of adsorption in some of these systems for appropriate choice of several system parameters, but that the quality of agreement depends on the pore size of the material.

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Controlled-pore glass as a stationary phase in chromatography

Cited by 35 publications

References 40 publications

Thermodynamic prediction of clathrate hydrate dissociation conditions in mesoporous media

Thermodynamic prediction of clathrate hydrate dissociation conditions in mesoporous media

Comparison of Dansylated Aminopropyl Controlled Pore Glass Solvated by Molecular and Ionic Liquids

Adsorption in Controlled-Pore Glasses: Comparison of Molecular Simulations with a Mean-Field Lattice Gas Model

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