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Type: Artigo de periódico
Title: New Silica Gel-Based Monolithic Column for Nano-Liquid Chromatography, used in the HILIC Mode
Author: Silva, RGC
Bottoli, CBG
Collins, CH
Abstract: This paper describes the synthesis and chromatographic and morphologic characterization of two monolithic silica nano-columns (50 mu m i.d.) prepared by sol-gel processes, using hydrophilic interaction (HILIC) mode separations to evaluate their performance. Two types of monoliths were prepared by varying the precursors (tetraethoxysilane or a tetraethoxysilane methyltrimethoxysilane mixture) and by changing the type of catalyst (urea and acetic acid or ammonium hydroxide). The monoliths were characterized by scanning electron microscopy, thermogravimetric analysis, infrared spectroscopy and nitrogen adsorption-desorption isotherms. The columns were tested for the separation of several mixtures, with the organically modified silica (ormosil) column successfully separating two challenging mixtures using HILIC conditions.
Country: EUA
Editor: Oxford Univ Press Inc
Rights: fechado
Identifier DOI: 10.1093/chromsci/bms081
Date Issue: 2012
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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