Motion of an anisotropic crystal in a rotating magnetic field

Abstract

The rotating motion of a magnetically anisotropic crystal, in a viscous medium and subject to a rotating magnetic field, is examined. Exact solutions are given for viscous or inertial dominance. Intermediate situations are investigated by a perturbation expansion and by analogue computations. When the external field rotates sufficiently rapidly the average angular velocity of the crystal decreases as the angular velocity of the field increases.

Ion Exchanger-Solvent Interactions: Properties and Methodology

“…The carboxyl bands have been used to demonstrate the presence of the carboxyl groups in other cation exchangers; presumably they are there as a result of oxidation of the resin. 242 IR data have been reported for Dowex 1 X 8 in SO 4 " 2 -, NO 3 --, CrO 4 " 2 -, and ClO 4 "-form. 252 The influence of selectivity and hydration on these data was discussed.…”

“…From the spectra he concluded that acetonitrile was not solvating the sulfonic acid site, while for dioxane an appreciable amount of solvation occurred. However, Whittington and Millar 242 have suggested that one of the absorption peaks used by Gordon 72 to indicate solvation may in fact be due to aromatic substitution.…”

“…72 ' 242 " 247 Quantitative relationships are possible, particularly as a function of cross-linking. 242 " 247 However, caution should be exercised in choosing the correct bands since some misassignments have apparently been made. 242 As previously stated, hydration in cation and anion exchangers can be examined by IR.…”

“…242 " 247 However, caution should be exercised in choosing the correct bands since some misassignments have apparently been made. 242 As previously stated, hydration in cation and anion exchangers can be examined by IR. Recently, this phenomenon was studied for exchangers in a variety of charged forms at various water levels using the band at 1.9 £<m. 248 The data were compared to IR data for solutions of corresponding ions, and hydration numbers for the exchangers were calculated.…”