![Sample our Economics, Finance,Business & Industry journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5931/TOC-Subject-Sample-2021-Economics-Finance-Business-Industry.jpg"})
ABSTRACT
Gelatin-stabilised magnetite particles with diameters less than 60A and having a narrow size distribution are prepared as dispersions in water using a one-stage process. Dilution studies and studies of viscosity, pH changes and oxidation of the fluids are reported. Gelatin markedly improves the stability of aqueous fluids to aerial oxidation. Denaturation of the polypeptide chains with a strong base causes flocculation of the magnetic particles, which after treatment with oleic acid etc. may be redispersed in water and in non-polar organic liquids (eg.toluene). Dilution stable fluids are produced incorporating up to 30% by weight of magnetic material.
Treatment of aqueous gelatin-stabilised fluids with sodium dodecylsulfate causes complexation between the anionic surfactant and coordinated gelatin, and produces flocculation of the particles. The magnetite is re-dispersed in polar organic solvents (e.g. ethanol), but not in non-polar organic solvents.