Magnetic Fluid

摘要

The present invention is in the field of fluids and the like comprising magnetic particles, such as ferromagnetic particles, anti-ferromagnetic particles, ferrimagnetic particles, synthetic magnetic particles, paramagnetic particles, superparamagnetic particles, such as magnetic fluids, a method of stabilizing magnetic particles, use of these fluids and functionalized particles. Such fluids have a large variety of applications, such as sealants, as a sensor, in biomedics, etc.

主权项

1. High density dispersion comprising magnetic particles, obtained by a method comprising the steps ofproviding a dispersion with magnetic particles, directly thereafter
providing a weak organic acid, or salt thereof, in an amount of 5*10−6-0.1 Mole acid/g magnetic particle, and interacting the weak organic acid and magnetic particles, maintaining the pH at a basic value, wherein after providing the weak organic acid the dispersion is washed one to four times, and wherein a washed dispersion is re-dispersed in a solvent, and wherein the dispersion is concentrated-to at least 15% v/v, wherein the magnetic particles are present in an amount >15 vol. % relative to a total volume of the dispersion, and in an amount >45 wt. % relative to a total weight of the dispersion, and wherein a weak organic acid is present in an amount of 5*10−6-0.1 Mole acid/g magnetic particle on the magnetic particle.