Funktionalisierte mesoporöse Monolithen für kontinuierliche Ringspalt‐Elektrochromatographie

Braunbruck, Marie-Gabrielle; Gruber‐Wölfler, Heidrun; Feenstra, Peter; Laskowski, Rene; Bart, Hans‐Jörg; Khinast, Johannes

doi:10.1002/cite.201250520

Cited by 1 publication

(2 citation statements)

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“…All electrolytes for the buffer preparation were obtained from VWR International (Darmstadt, Germany), filtered with a syringe filter (0.2 lm pore size, PTFE, VWR International), and degassed by sonication prior to use. The silica-based C8 monolith was prepared by a recipe proposed by Braunbruck et al [27,28]. The precursor mixture contained tetraethylorthosilicate as backbone, triethoxy(octyl)silane for functionalization, and hexadecyltrimethylammonium bromide as porogen.…”

Section: Chemicals and Buffer Preparationmentioning

confidence: 99%

“…Before starting the manufacturing of a continuous annular electrochromatographic apparatus, it was necessary to investigate the flow behavior in a planar reference system which represents a fraction of the final annular prototype. Considering the advantages of inorganic monolithic materials [25,26], as stationary phase a silica-based sol-gel monolith functionalized with C8 groups was employed [27,28].…”

Section: Introductionmentioning

confidence: 99%

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Separation, Hydrodynamics, and Joule Heating Effects in Continuous Annular Electrochromatography

Laskowski

Bart

2013

Chem Eng & Technol

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First experimental results of the transfer from an analytical batch electrochromatography to a continuous annular electrochromatographic process are presented. In order to study the electrochromatographic effects, hydrodynamics and functionality tests were investigated in a planar reference system. As stationary phase inside the annular gap, an inorganic C8 reverse-phase monolith prepared by an in situ sol-gel process was implemented. The generation of Joule heating during the process was determined by a contact-free thermal camera system. The volumetric flow rates of the electrolyte were detected by a gravimetric contact-free measurement method. Finally, a mixture of neutral test substances was used to evaluate the continuous separation efficiency and to fractionate the single substances under process-like conditions. The separation results were detected by an inline UV-Vis detection cell and the analysis of the single fractions was performed by an analytical electrochromatograph. The results indicate uniform electroosmotic flow as well as successful separation and fractioning of a neutral test mixture.

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Section: Chemicals and Buffer Preparationmentioning

confidence: 99%