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Sol-gel monolithic anion-exchange column for capillary electrochromatography [An article from: Analytica Chimica Acta]
Book Details
Author(s)T.A. Lin, G.Y. Li, L.K. Chau
PublisherElsevier
ISBN / ASINB000PAA5YG
ISBN-13978B000PAA5Y7
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
A single-step approach has been used to prepare a monolithic electrochromatographic column by sol-gel processing of an organofunctional silicon alkoxide precursor that contains a propyl-N,N,N-trimethylammonium group. We have found that the time of adding the porogen, poly(ethylene glycol), during the sol-gel reaction affected the separation performance. Since the surface charge of this material is switchable in sign upon manipulation of solution pH, the direction and magnitude of the electroosmotic flow (EOF) can be controlled by adjusting the pH of the running electrolyte. By controlling the direction of the EOF from cathode to anode, inorganic anions can be separated in a short time. Because of the quaternary ammonium functional group, the resulting material is anion exchangeable. Interestingly, the anion-exchange selectivity of inorganic anions on this column changes with solution pH or applied voltage. The column shows excellent run to run reproducibility (R.S.D.
Description:
A single-step approach has been used to prepare a monolithic electrochromatographic column by sol-gel processing of an organofunctional silicon alkoxide precursor that contains a propyl-N,N,N-trimethylammonium group. We have found that the time of adding the porogen, poly(ethylene glycol), during the sol-gel reaction affected the separation performance. Since the surface charge of this material is switchable in sign upon manipulation of solution pH, the direction and magnitude of the electroosmotic flow (EOF) can be controlled by adjusting the pH of the running electrolyte. By controlling the direction of the EOF from cathode to anode, inorganic anions can be separated in a short time. Because of the quaternary ammonium functional group, the resulting material is anion exchangeable. Interestingly, the anion-exchange selectivity of inorganic anions on this column changes with solution pH or applied voltage. The column shows excellent run to run reproducibility (R.S.D.
