Magnetic transient birefringence of ferrofluids : particle size determination
- 1 January 1987
- journal article
- Published by EDP Sciences in Journal de Physique
- Vol. 48 (8) , 1385-1391
- https://doi.org/10.1051/jphys:019870048080138500
Abstract
Relaxation time measurements of magnetically induced birefringence of ferrofluid solutions are performed with samples of various polydispersities. d H, the hydrodynamic diameter of particles deduced from experiments, is compared to a numerical computation with a log-normal distribution. Dynamic magnetic birefringence appears to be a good test of the tail of the sample size distribution. For a narrow distribution (σ ≃ 0.25), the experiment is in good agreement with the model: dH is two times larger than the most probable diameter and corresponds to the largest particles in the sampleKeywords
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