Vis enkel innførsel

dc.contributor.authorChristy, Alfred A.
dc.date.accessioned2010-11-12T12:06:08Z
dc.date.available2010-11-12T12:06:08Z
dc.date.issued2010
dc.identifier.citationChristy, A. A. (2010). New insights into the surface functionalities and adsorption evolution of water molecules on silica gel surface: A study by second derivative near infrared spectroscopy. Vibrational Spectroscopy, 54(1), 42-49. doi: 10.1016/j.vibspec.2010.06.003en_US
dc.identifier.issn0924-2031
dc.identifier.urihttp://hdl.handle.net/11250/138234
dc.descriptionAccepted version of an article in the journal: Vibrational Spectroscopy. Published version available on Science Direct: http://dx.doi.org/10.1016/j.vibspec.2010.06.003en_US
dc.description.abstractSurface functionalities and adsorption evolution of water molecules on silica gel samples were studied by second derivative near infrared spectroscopy. Four different silica gel samples with varying surface area were used in this experiment. Each of the dry samples was allowed to equilibrate with surrounding air and the near infrared spectra were accumulated at different time intervals using reflectance technique. The evolved spectra were analysed using second derivative technique to study the adsorption evolution of water molecules on the surface. The second derivative spectral profiles have revealed some interesting features about the surface functionalities and some events of adsorption on silica gel surface that have never been reported in the literature. The near infrared spectroscopic evidence is provided for the first time to show the presence of hydrogen bonded silanol groups on silica gel surface. The results and the events show that the adsorption of water molecules readily takes take place on the hydrogen bonded vicinal silanol groups and spread over the space and ends with the hydrogen bonding at free silanol groups. Water molecules then build over these molecules to form a network of hydrogen bonded water molecules. There is clear evidence that the presence of hydrogen bonded silanol groups is a necessary condition for the effective adsorption activities on silica gel surface. Furthermore, the study reveals that while mono and multi-layer water molecular adsorption takes place at certain active sites of the surface, a large portion of the surface is free from any adsorption activities.en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.titleNew insights into the surface functionalities and adsorption evolution of water molecules on silica gel surface: A study by second derivative near infrared spectroscopyen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.subject.nsiVDP::Mathematics and natural science: 400::Chemistry: 440::Environmental chemistry, natural environmental chemistry: 446en_US
dc.source.pagenumber42-49en_US


Tilhørende fil(er)

Thumbnail
Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel