Interpretation of the excess adsorption isotherms of organic eluent components on the surface of reversed-phase phenyl modified adsorbents

Chan, F.; Yeung, L.S.; LoBrutto, Rosario; Kazakevich, Yuri

doi:10.1016/j.chroma.2005.05.078

Cited by 51 publications

(22 citation statements)

References 31 publications

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“…The competitive nature of the organic solvent is the function of its physico-chemical properties. It is known from excess isotherm measurements that aprotic molecules occupy a significant volume of the pores, while the pores are more water-rich in the case of alcohols as organic solvent [29]. The on-set of sub-plateaus is connected with the affinity of the solvent molecule to the hydrophobic surface.…”

Section: Determination Of Adsorption Isotherm Datamentioning

confidence: 99%

Influence of the solvation process on solute adsorption in reversed phase liquid chromatography

Vajda

Bocian

Buszewski

et al. 2011

Journal of Chromatography A

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Section: Determination Of Adsorption Isotherm Datamentioning

confidence: 99%

Influence of the solvation process on solute adsorption in reversed phase liquid chromatography

Vajda

Bocian

Buszewski

et al. 2011

Journal of Chromatography A

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“…For understanding the distribution of the solvent between the adsorbed phase and a bulk binary solution the excess adsorption of the organic modifier must be described [14,19,20]. The excess amount of the adsorbed solvent changes with the surface properties of the stationary phase: the coverage [14,21] and the number of carbon atoms in organic ligands [1,22,23].…”

Section: Introductionmentioning

confidence: 99%

Study of solvent adsorption on chemically bonded stationary phases by microcalorimetry and liquid chromatography

Buszewski

Bocian

Rychlicki

et al. 2010

Journal of Colloid and Interface Science

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“…Low-temperature nitrogen adsorption (LTNA) is commonly used for the evaluation of surface area and pore size distribution of mesoporous materials. [3][4][5][6][7] Bonding density is determined by elemental analysis of the chemically modified phase. By dividing the bonding density by the specific surface area, the surface coverage can be estimated.…”

Section: Introductionmentioning

confidence: 99%

Revealing the Fine Details of Functionalized Silica Surfaces by Solid‐State NMR and Adsorption Isotherm Measurements: The Case of Fluorinated Stationary Phases for Liquid Chromatography

Ciogli

Simone

Villani

et al. 2014

Chemistry A European J

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The structural and chromatographic characterization of two novel fluorinated mesoporous materials prepared by covalent reaction of 3-(pentafluorophenyl)propyldimethylchlorosilane and perfluorohexylethyltrichlorosilane with 2.5 μm fully porous silica particles is reported. The adsorbents were characterized by solid state (29)Si, (13)C, and (19)F NMR spectroscopy, low-temperature nitrogen adsorption, elemental analysis (C and F), and various chromatographic measurements, including the determination of adsorption isotherms. The structure and abundance of the different organic surface species, as well as the different silanol types, were determined. In particular, the degree of so-called horizontal polymerization, that is, Si-O-Si bridging parallel to the silica surface due to the reaction, under "quasi-dry" conditions, of trifunctional silanizing agents with the silica surface was quantified. Significant agreement was found between the information provided by solid-state NMR, elemental analysis, and excess isotherms regarding the amount of surface residual silanol groups, on the one hand, and the degree of surface functionalization, on the other. Finally, the kinetic performance of the fluorinated materials as separation media for applications in near-ultrahigh-performance liquid chromatography was evaluated. At reduced velocities of about 5.5 (ca. 600 bar backpressure at room temperature) with 3 mm diameter columns and toluene as test compound, reduced plate heights on the order of 2 were obtained on columns of both adsorbents.

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Interpretation of the excess adsorption isotherms of organic eluent components on the surface of reversed-phase phenyl modified adsorbents

Cited by 51 publications

References 31 publications

Influence of the solvation process on solute adsorption in reversed phase liquid chromatography

Influence of the solvation process on solute adsorption in reversed phase liquid chromatography

Study of solvent adsorption on chemically bonded stationary phases by microcalorimetry and liquid chromatography

Revealing the Fine Details of Functionalized Silica Surfaces by Solid‐State NMR and Adsorption Isotherm Measurements: The Case of Fluorinated Stationary Phases for Liquid Chromatography

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