Complex behaviors of clay particles in air and CO2
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- Institutt for fysikk 
ABSTRACTPart IThe shear rheology of nano-clay particles when dispersed in liquid CO2 underelevated pressure using the Couette geometry is studied. A high pressure attachmentwith two different measuring systems - the double gap and Mooney systems- is used for this purpose. The clays are Laponite, Quick clay, Na-fluorohectoriteand Na-montmorillonite. The shear viscosities of the dispersions are measuredunder increasing shear rates or shear stresses. In addition an ageing test is carriedout for six days for a laponite-liquid CO2 dispersion. Inertia of the system iscompensated for by control shear stress tests.Part IIE-field induced chain formations of the nano-clay particles when dispersed in theair are recorded by a camera. A glove bag is prepared in such a way as to providea Nitrogen atmosphere and the procedure is repeated in this glove bag. In bothsituations the chain formations are observed. An attempt to measure the leakageof current within the electrode is also made by means of an operational amplifierand feedback resistor, even though the measurement of the current is uncertain.