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• W2155109265 endingPage "3042" @default.
• W2155109265 startingPage "3035" @default.
• W2155109265 abstract "During the last decade, silica monolithic capillaries have focused more and more attention on miniaturized separation techniques like CEC, nano-LC, and chip electrochromatography owing to their unique chromatographic properties and to their possible in situ synthesis. Nevertheless, the preparation of conventional silica-based individual monolithic columns is time consuming, owing to the individual steps involved, including the synthesis of the silica matrix and its subsequent on-column chemical grafting. The hybrid organic-inorganic monoliths, whose synthesis is based on the polycondensation of siloxane with organosiloxane precursors, seems to be an attractive alternative since their direct synthesis leads to silica monoliths with organic moieties covalently linked to the inorganic silica matrix through hydrolytically stable Si-C bonds. This study describes the synthesis of hybrid monoliths using propyltrimethoxysilane (C3-TriMOS) as a new kind of silica coprecursor to subsequently increase the hydrophobicity of the stationary phase. The influence of several experimental parameters (pH, gelation temperature, relative proportion of the precursors) on the textural (skeleton and macropore size) and chromatographic properties (efficiency, retention, and electroosmotic mobility) of the obtained monoliths are discussed. The results show that the optimal coprecursor incorporation is obtained after a postgelation step during which the condensation of the C3-TriMOS coprecursor is favored by an increase in the pH medium. Thermal hydrolysis of urea previously added to the polymerization mixture allows this in situ pH increase. These hybrid monoliths present hydrophobic properties and allow the separation of test mixtures in the RP mode without any further modification. Moreover, they present excellent efficiencies since reduced plate height as low as 5 and 15 microm are obtained in the electrodriven mode (CEC) and in the hydrodynamic one (nano-LC), respectively." @default.
• W2155109265 created "2016-06-24" @default.
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• W2155109265 date "2007-11-01" @default.
• W2155109265 modified "2023-10-05" @default.
• W2155109265 title "Synthesis of propyl-functionalized hybrid monolithic silica capillaries and evaluation of their performances in nano-LC and CEC" @default.
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• W2155109265 doi "https://doi.org/10.1002/jssc.200700304" @default.
• W2155109265 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18027896" @default.
• W2155109265 hasPublicationYear "2007" @default.
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