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dc.contributor.authorChristy, Alfred A.
dc.date.accessioned2012-08-30T10:53:02Z
dc.date.available2012-08-30T10:53:02Z
dc.date.issued2012
dc.identifier.citationChristy, A. A. (2012). Effect of heat on the adsorption properties of silica gel. International Journal of Engineering and Technology, 4(4), 484-488.no_NO
dc.identifier.issn1793-8236
dc.identifier.urihttp://hdl.handle.net/11250/136897
dc.descriptionPublished version of an article in the journal: International Journal of Engineering and Technology. Also available from the publisher at: http://www.ijetch.org/papers/416-T886.pdf Open access.no_NO
dc.description.abstractAdsorption properties of silica gel have been attributed to the surface hydroxyl groups of silica gel. Some hydroxyl groups are free standing and called free silanol groups. Some are hydrogen bonded to neighbouring silanol groups. Christy has shown that a high silanol number and a balanced concentration proportionality between these two different types of hydroxyl groups is necessary for effective adsorption of water molecules. Thermal treatment of silica gel samples alters the proportions of these groups and the above fact was investigated by using thermally treated silica gel samples. Two silica gel samples of varying surface areas and silanol numbers were dried under vacuum at 200 oC and their adsorption characteristics were followed by using NIR spectroscopy. Then the samples were subjected to heating at 350, 450, 600 degrees to cause changes in the concentrations of the surface silanol groups and their surface and adsorption characteristics were followed. The results clearly indicate that the heating process both remove free and hydrogen bonded silanol groups and alter the ratio between the two. Furthermore, the heating causes reduction in silanol umber and upsets the balance in the proportionality of the silanol groups for effective adsorption of water molecules.no_NO
dc.language.isoengno_NO
dc.publisherInternational Association of Computer Science and Information Technology Pressno_NO
dc.subjectsilanol groupsno_NO
dc.subjectadsorption NIR spectroscopyno_NO
dc.subjectsecond derivative profilesno_NO
dc.titleEffect of heat on the adsorption properties of silica gelno_NO
dc.typeJournal articleno_NO
dc.typePeer reviewedno_NO
dc.subject.nsiVDP::Mathematics and natural science: 400::Chemistry: 440no_NO
dc.source.pagenumber484-488no_NO
dc.source.volume4no_NO
dc.source.journalInternational Journal of Engineering and Technologyno_NO
dc.source.issue4no_NO


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