title: Study of hydration process on silica hydride surfaces by microcalorimetry and water adsorption.
abstract: A series of hydrosilated stationary phases were compared with respect to their hydrophilic-hydrophobic properties. The stationary phases were also compared to the bare silica gel used for this synthesis. The investigations were done using microcalorimetric measurements of methanol and acetonitrile heats of immersion. Because these stationary phases are used in both the reversed-phase and aqueous normal phase modes of liquid chromatography, the excess isotherm of water from acetonitrile solution was measured. From the materials tested the highest polarity was exhibited by the silica hydride and the bare silica. The Diamond Hydride is less polar. The highest hydrophobicity is exhibited by the hydrosilated stationary phase which contains bonded octadecyl ligands.
authors.affiliation: Department of Environmental Chemistry & Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, Gagarin 7 St., 87-100 Torun, Poland.
authors.forename: Szymon
authors.initials: S
authors.lastname: Bocian
authors.affiliation: Physicochemistry of Carbon Materials Research Group, Faculty of Chemistry, Nicolaus Copernicus University, Gagarin 7 St., 87-100 Torun, Poland.
authors.forename: Gerhard
authors.initials: G
authors.lastname: Rychlicki
authors.affiliation: Department of Chemistry, San Jose State University, One Washington Square, San Jose, CA 95192, USA.
authors.forename: Maria
authors.initials: M
authors.lastname: Matyska
authors.affiliation: Department of Chemistry, San Jose State University, One Washington Square, San Jose, CA 95192, USA.
authors.forename: Joseph
authors.initials: J
authors.lastname: Pesek
authors.affiliation: Department of Environmental Chemistry & Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, Gagarin 7 St., 87-100 Torun, Poland. Electronic address: bbusz@chem.uni.torun.pl.
authors.forename: Bogusław
authors.initials: B
authors.lastname: Buszewski
mesh_terms: D000097:Acetonitriles / Q000737:chemistry*; D000327:Adsorption; D002151:Calorimetry; D002853:Chromatography, Liquid / Q000379:methods; D057927:Hydrophobic and Hydrophilic Interactions; D000432:Methanol / Q000737:chemistry*; D058428:Silica Gel / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D000097:Acetonitriles; D017640:Silicates; C487012:silica hydride; D014867:Water; D058428:Silica Gel; D000432:Methanol; C032159:acetonitrile
keywords: Heat of adsorption; Silica hydride; Stationary phase surface characterization; Water adsorption