METHOD OF MEASURING DISPERSION OF MAGNETIC MOMENT OF NANOPARTICLES IN MAGNETIC LIQUID Russian patent published in 2016 - IPC G01N27/74 B82B1/00 

FIELD: measuring equipment.

SUBSTANCE: invention provides a method of measuring dispersion distribution of magnetic moments of nanoparticles in magnetic fluid and is intended for control of magnetic liquids, when a small dispersion of magnetic moments of nanoparticles is required. Method comprises obtaining dependence of magnetisation M from magnetic induction B, determined by dependence of saturation magnetisation M_nas and average magnetic moment P_sr at final section of magnetisation curve, calculating value of magnetic field induction B*, where Langevin parameter ƺ=(P_srB*/kT)=3 (k is Boltzmann constant, T is temperature), finding initial magnetic susceptibility æ_nach=M _nach μ ₀ /B _nach, finding effective saturation magnetisation M _nas *=(æ_nach B*/μ ₀) and by formula d=(M_nas*-M_nas)(P_sr)²/M_nas determining dispersion distribution of magnetic moments.

EFFECT: technical result consists in increasing objectiveness and accuracy of magnetic-particle-size analysis of magnetic liquids.

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