Supercritical carbon dioxide versus toluene as reaction media in silica functionalisation: Synthesis and characterisation of bonded aminopropyl silica intermediate

dc.contributor.authorAshu-Arrah, Benjamin A.
dc.contributor.authorGlennon, Jeremy D.
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2017-05-12T11:36:34Z
dc.date.available2017-05-12T11:36:34Z
dc.date.issued2017-04-14
dc.date.updated2017-05-12T11:28:43Z
dc.description.abstractThis research reports supercritical carbon dioxide versus toluene as reaction media in silica functionalisation for use in liquid chromatography. Bonded aminopropyl silica (APS) intermediates were prepared when porous silica particles (Exsil-pure, 3 μm) were reacted with 3-aminopropyltriethoxysilane (3-APTES) or N,N-dimethylaminopropyltrimethoxysilane (DMAPTMS) using supercritical carbon dioxide (sc-CO2) and toluene as reaction media. Covalent bonding to silica was confirmed using elemental microanalysis (CHN), thermogravimetric analysis (TGA), zeta potential (ξ), diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, scanning electron microscopy (SEM) and solid-state nuclear magnetic resonance (CP/MAS NMR) spectroscopy. The results demonstrate that under sc-CO2 conditions of 100 °C/414 bar in a substantial reduced time of 3 h, the surface coverage of APS (evaluated from%C obtained from elemental analysis) prepared with APTES (%C: 8.03, 5.26 μmol/m−2) or DMAPTES (%C: 5.12, 4.58 μmol/m2) is somewhat higher when compared to organic based reactions under reflux in toluene at a temperature of 110 °C in 24 h with APTES (%C: 7.33, 4.71 μmol/m2) and DMAPTMS (%C: 4.93, 4.38 μmol/m2). Zeta potential measurements revealed a change in electrostatic surface charge from negative values for bare Exsil-pure silica to positive for functionalised APS materials indicating successful immobilization of the aminosilane onto the surface of silica.en
dc.description.sponsorshipScience Foundation Ireland (Irish Separation Science Cluster (ISSC) http://www.separationscience.ie under their Strategic Research Cluster (SRC) programme (grant 08/SRC/B1412))en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationAshu-Arrah, B. A. and Glennon, J. D. (2017) 'Supercritical carbon dioxide versus toluene as reaction media in silica functionalisation: Synthesis and characterisation of bonded aminopropyl silica intermediate', Journal of Chromatography A, 1501, pp. 18-25. doi:10.1016/j.chroma.2017.04.030en
dc.identifier.doi10.1016/j.chroma.2017.04.030
dc.identifier.endpage25en
dc.identifier.issn0021-9673
dc.identifier.journaltitleJournal of Chromatography Aen
dc.identifier.startpage18en
dc.identifier.urihttps://hdl.handle.net/10468/3955
dc.identifier.volume1501en
dc.language.isoenen
dc.publisherElsevieren
dc.rights© 2017 Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectChemical functionalisationen
dc.subjectSupercritical CO2en
dc.subjectAminopropyl bonded silica (APS)en
dc.subjectBi-functional bondingen
dc.subjectSurface coverage/conversion efficiencyen
dc.titleSupercritical carbon dioxide versus toluene as reaction media in silica functionalisation: Synthesis and characterisation of bonded aminopropyl silica intermediateen
dc.typeArticle (peer-reviewed)en
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