Gas chromatographic study of the existence and the physical state of monomolecular films of stationary phases in contact with siliceous supports

Serpinet, J.

doi:10.1016/s0021-9673(00)88758-0

Cited by 36 publications

(4 citation statements)

References 7 publications

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“…Enthalpy effects related to the temperature changes in water/silica gel systems can also be studied. All these experiments confirm Serpinet's observations regarding the shape and transition of chemically bonded ligands (12,13). Adiabatic calorimetry may also be used…”

Section: Elemental Thermal and Microcalorimetric Analysissupporting

confidence: 86%

“…New-generation materials do not contain heteroatoms, therefore analysis at pH >8.5 is possible. Inverse GC demonstrated the existence and phase transition of a brush-like film of paraffins (12). Similar experiments at various temperatures were performed for C 18 and C 22 alkyl monolayers at the surface of silica, which showed that the ligand transition is very important and occurs even at room temperature (13).…”

Section: Chromatographic Methodsmentioning

confidence: 72%

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Peer Reviewed: Characterizing HPLC Stationary Phases

Krupczyńska¹,

Buszewski²

2004

Anal. Chem.

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great variety of stationary phases is available to analyze an even larger array of compounds. Stationary phases in which organic moieties (alkyl chains, aryl, amine, cholesterolic, phospholipids, phenol groups, etc.) are grafted onto a silica surface are the most popular. Sometimes the stationary phases themselves must be characterized, such as for quality control purposes. Often, interpreting chromatographic data is difficult because even columns that are "identical"-produced by the same manufacturer-exhibit different chromatographic properties. Determining the structure and properties of new stationary phases is also extremely important so that the retention mechanism, which plays a significant role in selectivity, can be described accurately. Chromatographic separation occurs because of the differences in the affinities of solute molecules for the stationary phase-retention is a process of solute transfer from a mobile phase onto/into a stationary phase (1).Column quality depends on a number of factors, the most important of which are homogeneity of both particle packing in the column bed and arrangement of the chemically bonded phase on the adsorbent surface. These factors determine the reproducibility of chromatographic data, and the large number of these factors is why there are a lot of methods for characterizing columns. Obviously, no ideal single technique can characterize all the © 2 0 0 4 A M E R

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Section: Elemental Thermal and Microcalorimetric Analysissupporting

confidence: 86%

Section: Chromatographic Methodsmentioning

confidence: 72%

Peer Reviewed: Characterizing HPLC Stationary Phases

Krupczyńska¹,

Buszewski²

2004

Anal. Chem.

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show abstract

“…Enthalpy effects related to the temperature changes in water/silica gel systems can also be studied. All these experiments confirm Serpinet's observations regarding the shape and transition of chemically bonded ligands [66,67]. Adiabatic calorimetry may also be used to estimate transition entropy and enthalpy and provide confirmation of chemically bonded moieties [68].…”

Section: Differential Scanning Calorimetry (Dsc)supporting

confidence: 85%

Physico-chemical methods for the chromatographic materials heterogeneity evaluation

Michel¹,

Sprynskyy²,

Buszewski³

2009

Annales UMCS, Chemistry

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The characterization methods used in the analysis of the chemical structure, microstructure and morphology, as well as the physical properties, of the chromatographic support are varied. This paper will focus on some techniques often used for the investigation of polymer/silica stationary phases. Many of these techniques are specific for characterization of particular properties of phases, and the properties of phases are also discussed correspondingly. To fully understand structure-property relationships, several characterization techniques are presented.

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“…A model presenting GC stationary phases as ordered monomolecular films in equilibrium with bulk capillary liquids has been used previously for interpreting chromatographic results obtained with n -docosane and n -octadecanol adsorbed on hydroxylated siliceous supports. , The hypothesis of the formation of a monolayer of n -octadecanol molecules oriented nearly perpendicularly relative to the solid surface was supported by the convergence of molecular area values obtained from GC and Langmuir monolayer experiments. , However, the conclusions on stationary phase organization reached for n -docosane and n -octadecanol should not be hastily extrapolated to more complex molecules, whose organization depends on structural features such as the geometry around the NN moiety . Indeed, we showed recently that some LC have a high propensity for multilayer rather than monolayer formation .…”

Section: Introductionmentioning

confidence: 99%

Organization of Four Thermotropic Liquid Crystals of Different Polarities on Model Liquid and Solid Surfaces

Badis¹,

Guermouche²,

Bayle³

et al. 2004

Langmuir

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The thermodynamic and surface properties of four structurally related thermotropic liquid crystals (LC) were investigated to understand their organization at gas-liquid and gas-solid interfaces. In this study, LC with a benzoyloxy azobenzene mesogenic core substituted with heptyloxy and/or dioxyethylene ether groups were used. The propensity of the LC to form self-assembled multilayers was demonstrated in the films spread at the air/aqueous interface using the Langmuir technique and Brewster angle microscopy and on the solid surfaces of Chromosorb WHP and silica, using differential scanning calorimetry. On the basis of the results obtained, a molecular recognition mechanism underlying separation processes using LC as selectors in gas chromatography is proposed.

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Gas chromatographic study of the existence and the physical state of monomolecular films of stationary phases in contact with siliceous supports

Cited by 36 publications

References 7 publications

Peer Reviewed: Characterizing HPLC Stationary Phases

Peer Reviewed: Characterizing HPLC Stationary Phases

Physico-chemical methods for the chromatographic materials heterogeneity evaluation

Organization of Four Thermotropic Liquid Crystals of Different Polarities on Model Liquid and Solid Surfaces

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