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Monolithic capillary columns consisting of poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) and their diol derivatives with incorporated hydroxyl functionalized multiwalled carbon nanotubes for reversed-phase capillary electrochromatography

Abstract

Two types of monolithic stationary phases with incorporated hydroxyl functionalized multiwalled carbon nanotubes (OH-MWCNTs) were introduced and evaluated, namely poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) monolith, denoted as poly(GMA-co-EDMA), and the diol derivative of poly(GMA-co-EDMA) monolith. The diol derivative monolith was obtained by subjecting the poly(GMA-co-EDMA) monolith with physically incorporated OH-MWCNTs to an acid treatment with 0.1 M sulfuric acid at moderate temperature of 50˚C for a total of 7.5 h. Also, the poly(GMA-co-EDMA) monolith was prepared in both physically and covalently incorporated OH-MWCNTs by subjecting the physically incorporated monolithic column to a Lewis acid catalyzed reaction in the presence of BF3 in order to react some of the OH-MWCNTs with the epoxy ring of the poly(GMA-co-EDMA) monolith. In all cases, the OH-MWCNTs were subjected to high power sonication at an output power of 10 W for 15 min in the aim of better dispersing the incorporated nanotubes into the monoliths under investigation. In fact, the high power sonication yielded columns with a relatively higher plate count (more than 3 folds increase) when compared to low power sonication. While the incorporation of OH-MWCNTs in the poly(GMA-co-EDMA) monolith acted as an amendment boosting the nonpolar character of the monolith and providing additional π-π interactions, the diol derivative monolith with its polar backbone character acted nearly as a support for the OH-MWCNTs stationary phase giving rise to a carbon nanotube sorbent providing hydrophobic and π-π interactions via the incorporated OH-MWCNTs. The two kinds of columns were evaluated with alkylbenzenes, toluene derivatives, aniline compounds, phenols and polyaromatic hydrocarbons.

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Publication details

The article was received on 28 Aug 2017, accepted on 13 Nov 2017 and first published on 13 Nov 2017


Article type: Paper
DOI: 10.1039/C7AN01426K
Citation: Analyst, 2017, Accepted Manuscript
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    Monolithic capillary columns consisting of poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) and their diol derivatives with incorporated hydroxyl functionalized multiwalled carbon nanotubes for reversed-phase capillary electrochromatography

    N. Ganewatta and Z. ElRassi, Analyst, 2017, Accepted Manuscript , DOI: 10.1039/C7AN01426K

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