Nuclear Magnetic Resonance and Rheological Studies on the Thixotropic Properties of Montmorillonite-Water Systems

Pharmaceutical Sciences-1969: Literature Review of Pharmaceutics

“…The specific parameters used were the change in line width of the NMR spectrum and the static yield values obtained from the rheograms. The results were in complete agreement with the theory that the colloidal particles, upon contact, adhere to form a spacious matrix resembling a house of cards (983).…”

Recent Advances in Pharmaceutical Rheology

“…The mechanism of the stabilization of suspensions by means of bentonite is assumed to be due to the presence of a yield value (Tufegdzic, 1965). Kibbe and Araujo (1969) evaluated several proposed mechanisms for the thixotropic behaviour of aqueous bentonite suspensions when they investigated the effects of temperature, re-shearing, concentration and storage time on these systems using NMR spectroscopy combined with rheological measurements. It was found that the static yield value increased with storage time, temperature and concentration, but decreased with repeated shearing.…”