Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/196252
Type: Artigo de periódico
Title: Highly Porous Solid-phase Microextraction Fiber Coating Based On Poly(ethylene Glycol)-modified Ormosils Synthesized By Sol-gel Technology.
Author: da Costa Silva, Raquel Gomes
Augusto, Fabio
Abstract: The preparation and characteristics of solid-phase microextraction (SPME) fibers coated with Carbowax 20M ormosil (organically modified silica) are described here. Raw fused silica fibers were coated with Carbowax 20M-modified silica using sol-gel process. Scanning electron micrographs of fibers revealed a highly porous, sponge-like coating with an average thickness of (8 +/- 1) microm. The sol-gel Carbowax fibers were compared to commercial fibers coated with 100 microm polydimethylsiloxane (PDMS) and 65 microm Carbowax-divinylbenzene (DVB). Shorter equilibrium times were possible with the sol-gel Carbowax fiber: for headspace extraction of the test analytes, they ranged from less than 3 min for benzene to 15 min for o-xylene. Extraction efficiencies of the sol-gel Carbowax fiber were superior to those of conventional fibers: for o-xylene, the extracted masses were 230 and 540% of that obtained with 100 microm PDMS and 65 microm Carbowax-DVB fibers, respectively.
Subject: Benzene
Benzene Derivatives
Chromatography, High Pressure Liquid
Dimethylpolysiloxanes
Fiber Optic Technology
Gels
Microchemistry
Microscopy, Electron, Scanning
Phase Transition
Polyethylene Glycols
Silicones
Toluene
Vinyl Compounds
Rights: fechado
Identifier DOI: 
Address: http://www.ncbi.nlm.nih.gov/pubmed/15881453
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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