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Carbon Dioxide Intercalation in Sodium Fluorohectorite Clay
Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, Department of Physics.
2011 (Norwegian)MasteroppgaveStudent thesisAlternative title
Carbon Dioxide Intercalation in Sodium Fluorohectorite Clay (English)
Abstract [no]
Wide angle X-ray Scattering (WAXS) measurements of the layered synthetic silicate sodium fluorohectorite (NaFh) when exposed to pressurized carbon dioxide are reported. With a custom made sample holder placed on top of a cooling system, measurements of the NaFh were taken at diferent conditions for temperature and pressure. The interlamellar spacing of the clay particles is observed to expand approximately 2:4Å in the 001-direction when the sample is held at -20 degrees Celsius and exposed to 15 bar of CO2 for over 9 days, indicating the intercalation of CO2. The d-spacing after intercalation is indistinguishable from the d-spacing of NaFh in the 1WL hydration state. The rate of intercalation process is reported to be dependent on the temperature and the pressure of CO2, with the decrease of temperature and the increase of pressure beeing favorable for intercalating CO2. Through various measurements the possibillity of water as the observed intercalated guest substance has been ruled out. Molecular models based on the swelling free energy are proposed to explain some of the features observed in the experiment.
Place, publisher, year, edition, pages
Institutt for fysikk , 2011. , 70 p.
Keyword [no]
ntnudaim:6419, MFY Fysikk,
Identifiers
URN: urn:nbn:no:ntnu:diva-12793Local ID: ntnudaim:6419OAI: oai:DiVA.org:ntnu-12793DiVA: diva2:424963
Supervisors
Available from: 2011-06-20 Created: 2011-06-20

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