Transverse magneto-optical anisotropy in bidisperse ferrofluids with long range particle correlations

Ferrofluids and bio-ferrofluids: looking back and stepping forward

“…13c) is due to magnetically induced anisotropy of the nanoparticles’ pair correlation function. 258,270–273…”

“…287 The bidisperse model accounts for the magnetic field dependence of Φ max and Φ 0 , which was not achieved by a monodisperse model. 272,273…”

“…13c) is due to magnetically induced anisotropy of the nanoparticles' pair correlation function. 258,[270][271][272][273] In the case of high colloidal stability low concentration ferrofluids particle clusters are practically absent; therefore, the rotation mechanism is the most plausible. During preparation nanoparticles with a non-ideal morphology result whose form can be approximated by an ellipsoid of revolution.…”

“…In the case of non-aggregated magnetic nanoparticles in concentrated ferrofluids the coupling between the magnetic dipole-field and the long-range dipole-dipole interactions leads to a magnetically induced anisotropy of the particle pair correlation function, which causes magnetically induced optical anisotropy. 258,[270][271][272][273] The specific dichroism in the case of a steric stabilized ferrofluid shows a concave shape dependence on solid volume fraction: it increases with increasing volume fraction in the region of diluted samples, but above Φ max volume fraction the specific dichroism decays, going negative above Φ 0 . Using the general theory for the influence of the pair correlation function on the optical anisotropy in ferrofluids, 258 a bidisperse model was developed 273 based on the bidisperse pair correlation theory.…”

“…258,[270][271][272][273] The specific dichroism in the case of a steric stabilized ferrofluid shows a concave shape dependence on solid volume fraction: it increases with increasing volume fraction in the region of diluted samples, but above Φ max volume fraction the specific dichroism decays, going negative above Φ 0 . Using the general theory for the influence of the pair correlation function on the optical anisotropy in ferrofluids, 258 a bidisperse model was developed 273 based on the bidisperse pair correlation theory. 287 The bidisperse model accounts for the magnetic field dependence of Φ max and Φ 0 , which was not achieved by a monodisperse model.…”