Preparation and properties of open tubular columns coated with tetra-n-butylammonium tetrafluoroborate

Dhanesar, Subhash C.; Poole, Colin F.

doi:10.1021/ac00277a055

Cited by 24 publications

(6 citation statements)

References 18 publications

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“…A characteristic of these columns was a limited temperature‐operating range due to unstable film formation at higher temperatures 10, 68. Film formation/stability could be improved by surface roughening using chemical etching of glass surfaces with ammonium bifluoride 70, 71 or deposition of a thin layer of sodium chloride on glass or fused silica surfaces 46, 65, 72 but without changes in stationary phase chemistry these columns lacked suitable temperature‐operating ranges and general robustness to compete with conventional non‐ionic stationary phases for practical applications.…”

Section: Wall‐coated Open‐tubular Columnsmentioning

confidence: 99%

Ionic liquid stationary phases for gas chromatography

Poole

2011

J of Separation Science

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208

108

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This article provides a summary of the development of ionic liquids as stationary phases for gas chromatography beginning with early work on packed columns that established details of the retention mechanism and established working methods to characterize selectivity differences compared with molecular stationary phases through the modern development of multi-centered cation and cross-linked ionic liquids for high-temperature applications in capillary gas chromatography. Since there are many reviews on ionic liquids dealing with all aspects of their chemical and physical properties, the emphasis in this article is placed on the role of gas chromatography played in the design of ionic liquids of low melting point, high thermal stability, high viscosity, and variable selectivity for separations. Ionic liquids provide unprecedented opportunities for extending the selectivity range and temperature-operating range of columns for gas chromatography, an area of separation science that has otherwise been almost stagnant for over a decade.

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Section: Wall‐coated Open‐tubular Columnsmentioning

confidence: 99%

Ionic liquid stationary phases for gas chromatography

Poole

2011

J of Separation Science

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208

108

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“…Orientation and proton donor interactions were important for alcohols, halocarbons, substituted aromatics, and essential oils [25]. These previous studies were done using packed columns with [26]. Whiskers on the inside surface of the soda lime capillaries were prepared using ammonium bifluoride and then silanized before coating with a 7 -20 mg/ mL IL solution.…”

Section: Ils As Standard-coated Gc Stationary Phasesmentioning

confidence: 99%

Utility of ionic liquids in analytical separations

Shamsi

Danielson

2007

J of Separation Science

178

103

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Ionic liquids (ILs), as separation media, have made significant contributions in the past decades in advancing research in gas chromatography (GC), liquid chromatography (LC), and capillary electrophoresis (CE). This review, covering reports published from the mid 1980s to early 2007, shows how ILs have been used so far in separation science, originally primarily as GC stationary phases and later as mobile phase additives (both millimolar and major percent levels) for LC and CE. Representative GC and LC chromatograms as well as CE electropherograms are shown. In addition, the very recent findings on the development of ionic liquids with surfactant properties and its applications for chiral and achiral analysis are discussed.

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“…Those of chromatographic interest include roomtemperature liquid organic salts for liquid (3) and gas chromatography (4,5), screening of alkylammonium and alkylphosphonium salts for use in gas chromatography (6,7), alkylammonium tetrafluoroborate salts as high-tem-perature stable phases (7,8), and systematic studies of the role of the anion (8,9) and cation (10) in influencing retention of organic solutes by alkylammonium salts. It has also been demonstrated that stable, long-lived, open tubular columns can be prepared with organic salts on highly roughened whisker surfaces (8,11,12) or layers of sodium chloride (8,13). A contemporary review of all these studies has appeared recently (1).…”

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confidence: 99%