| Autor: |
Meziani A; Univ Rouen Normandie, FR CNRS 3038, SMS, UR3233, Rouen F-76000, France.; Laboratoire de Chromatographie, Faculté de Chimie, USTHB, BP 32 EL-Alia, Alger 16111, Algeria., Verloy S; Department of Chemical Engineering CHIS, Vrije Universiteit Brussel, Brussels 1050, Belgium.; Mesoscale Chemical Systems, University of Twente, Enschede 7522, North Brabant, Netherlands., Ferroukhi O; Laboratoire de Chromatographie, Faculté de Chimie, USTHB, BP 32 EL-Alia, Alger 16111, Algeria., Roca S; Univ Rouen Normandie, FR CNRS 3038, SMS, UR3233, Rouen F-76000, France., Curat A; Univ Rouen Normandie, FR CNRS 3038, SMS, UR3233, Rouen F-76000, France., Tisse S; Univ Rouen Normandie, FR CNRS 3038, SMS, UR3233, Rouen F-76000, France., Peulon-Agasse V; Univ Rouen Normandie, FR CNRS 3038, SMS, UR3233, Rouen F-76000, France., Gardeniers H; Mesoscale Chemical Systems, University of Twente, Enschede 7522, North Brabant, Netherlands., Desmet G; Department of Chemical Engineering CHIS, Vrije Universiteit Brussel, Brussels 1050, Belgium., Cardinael P; Univ Rouen Normandie, FR CNRS 3038, SMS, UR3233, Rouen F-76000, France. |
| Abstrakt: |
The present study investigated the use of a dedicated gas chromatography (GC) column ( L = 70 cm, 75 μm deep, and 6.195 mm wide) with radially elongated pillars (REPs) as the second column in a comprehensive two-dimensional gas chromatography (GC × μGC) system. Three stationary phases [apolar polydimethylsiloxane (PDMS), medium polar room-temperature ionic liquid (RTIL) based on monocationic phosphonium, and polar polyethylene glycol (PEG-1000)] have been coated using the static method at constant pressure or using an original vacuum pressure program (VPP) from 400 to 4 mbar. The best efficiency reached up to N = 62,000 theoretical plates for a film thickness of 47 nm at 100 °C for an iso -octane peak ( k = 0.16) at an optimal flow rate of 4.8 mL/min. The use of the VPP improved the efficiency by approximately 15%. Efficiencies up to 28,000 and 47,000 were obtained for PEG-1000 and RTIL, respectively. A temperature-programmed separation of a mixture of 11 volatile compounds on a PDMS-coated chip was obtained in less than 36 s. The PDMS-, PEG-1000-, and RTIL-coated chips were tested as the second column using a microfluidic reverse fill/flush flow modulator in a GC × μGC system. The REP columns were highly compatible with the operating conditions in terms of flow rate and with more than 30,000 plates for the iso -octane peak. Moreover, a commercial solvent called white spirit containing alkanes and aromatic compounds was injected in three sets of columns in normal and reverse modes, demonstrating the great potential of the chip as a second-dimension separation column. |
