title: Temperature control in large-internal-diameter scaffolded monolithic columns operated at ultra-high pressures.
abstract: Scaffolding makes it feasible to create organic-polymer monoliths in large confinements, such as wide-bore columns. By creating the scaffold from a metal good heat conductivity inside the column is obtained, which renders the relatively large columns (comparable with 4.6 mm i.d.) suitable for application under ultra-high-pressure LC conditions. It was anticipated that the metal scaffold would allow accurate control of the temperature within the columns, but the temperature profiles within the columns could not be characterized using the previously available small-internal-diameter scaffolded columns. In the current study the internal diameter of the scaffolded columns was increased up to square conduits of 4×4 mm. Prior to the formation of the stationary phase the heating efficiency in the empty scaffolded conduits was addressed. The performance of stationary phases created in the large scaffolds was investigated using the kinetic performance approach and the results were compared to those of the previous studies. Finally, scaffolded columns were tested under ultra-high-pressure LC conditions, where good temperature control is essential.
authors.affiliation: University of Amsterdam, van't Hoff Institute for Molecular Sciences, Analytical-Chemistry Group, Science Park 904, 1098 XH Amsterdam, The Netherlands. Electronic address: rudy.vonk@hotmail.com.
authors.forename: Rudy J
authors.initials: RJ
authors.lastname: Vonk
authors.affiliation: University of Amsterdam, van't Hoff Institute for Molecular Sciences, Analytical-Chemistry Group, Science Park 904, 1098 XH Amsterdam, The Netherlands.
authors.forename: Tom
authors.initials: T
authors.lastname: Aalbers
authors.affiliation: Vrije Universiteit Brussel, Department of Chemical Engineering, Pleinlaan 2, B-1050 Brussels, Belgium.
authors.forename: Sebastiaan
authors.initials: S
authors.lastname: Eeltink
authors.affiliation: University of Amsterdam, van't Hoff Institute for Molecular Sciences, Analytical-Chemistry Group, Science Park 904, 1098 XH Amsterdam, The Netherlands.
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Schoenmakers
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation*; D007700:Kinetics; D011108:Polymers; D011312:Pressure; D013696:Temperature
chemical_list: D011108:Polymers
keywords: Adiabatic conditions; Isothermal conditions; Organic monoliths; Scaffolding; Ultra-high pressures; Viscous friction