Ionic liquid-coated alumina-pretreated micro gas chromatography columns for high-efficient separations

Micro Gas Chromatography: An Overview of Critical Components and Their Integration

“…101 Peak tailing in microcolumns is primarily due to surface adsorption. [81][82][83]115 Over the years, there have been parallel studies in the development of more homogeneous stationary phase films by employing solid-phase materials and alternate coating techniques. One of the earliest studies was conducted by Kolesar and Reston in the 1990s.…”

“…Despite a more homogeneous film formation, the separation efficiency and peak symmetry, of these solid-phase materials in general do not exceed the performance of the columns coated using conventional static or dynamic methods. 58,61,81,115 Recently, there has been interest in the development of monolayer-protected gold, i.e., a gold coated with a onemolecule-thick film of a compound as stationary phase in GC. The original work in this field was conducted by Gross and coworkers.…”

“…The separation efficiency of these columns is, however, not as high as that observed with a dynamically coated microcolumn. 62,115 Two promising classes of materials that have recently attracted much attention as stationary phases in microfabricated columns are metal−organic frameworks (MOFs) 124 and room temperature ionic liquids (RTILs). 47,103,115 MOFs are porous crystalline materials formed by coordination of metal cations and multidentate organic ligands.…”

“…62,115 Two promising classes of materials that have recently attracted much attention as stationary phases in microfabricated columns are metal−organic frameworks (MOFs) 124 and room temperature ionic liquids (RTILs). 47,103,115 MOFs are porous crystalline materials formed by coordination of metal cations and multidentate organic ligands. MOFs possess high thermal stability, tunable adsorption affinities, high surface area, and uniformly structured cavities.…”

Metal 3D‐printed catalytic jet and flame ionization detection for in situ trace carbon oxides analysis by gas chromatography

“…While these techniques are quite popular, false positive and high detection limits in the range of 50 ppm v/v were often encountered, especially in a complex matrix. Portable micromachined GC equipped with a classical capillary column or a micromachined column, and a micromachined thermal conductivity detector have been used successfully to improve the accuracy of the measurement . With such an analytical platform, a detection limit of 10 ppm v/v for CO and CO 2 can be attained.…”