Complex behaviors of clay particles in air and CO2
The shear rheology of nano-clay particles when dispersed in liquid CO2 under
elevated pressure using the Couette geometry is studied. A high pressure attachment
with two different measuring systems - the double gap and Mooney systems
- is used for this purpose. The clays are Laponite, Quick clay, Na-fluorohectorite
and Na-montmorillonite. The shear viscosities of the dispersions are measured
under increasing shear rates or shear stresses. In addition an ageing test is carried
out for six days for a laponite-liquid CO2 dispersion. Inertia of the system is
compensated for by control shear stress tests.
E-field induced chain formations of the nano-clay particles when dispersed in the
air are recorded by a camera. A glove bag is prepared in such a way as to provide
a Nitrogen atmosphere and the procedure is repeated in this glove bag. In both
situations the chain formations are observed. An attempt to measure the leakage
of current within the electrode is also made by means of an operational amplifier
and feedback resistor, even though the measurement of the current is uncertain.
Place, publisher, year, edition, pages
Institutt for fysikk , 2011. , 113 p.
ntnudaim:6670, MSCONDMAT Condensed Matter Physics,
IdentifiersURN: urn:nbn:no:ntnu:diva-13336Local ID: ntnudaim:6670OAI: oai:DiVA.org:ntnu-13336DiVA: diva2:437482
Fossum, Jon Otto, Professor