The IR absorption spectra for monolithic ormosil B are shown in Figure B. Infrared (KBr pellet) spectra for monolithic silica A and monolithic ormosil B. 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. The monoliths were characterized by scanning electron microscopy, thermogravimetric analysis, infrared spectroscopy and nitrogen adsorption–desorption isotherms. 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). Fundamentos De Cromatografia Carol Collins Pdf Rating: 7,0/10 8072votesĪbstract This paper describes the synthesis and chromatographic and morphologic characterization of two monolithic silica nano-columns (50 µm i.d.) prepared by sol-gel processes, using hydrophilic interaction (HILIC) mode separations to evaluate their performance.
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