Preparation and magnetic properties of concentrated magnetic fluids on alcohol and water carrier liquids

The preparation procedure for very concentrated magnetic fluids on various polar liquids, especially on C3-C10 (propanol, ..., decanol) alcohol carriers is presented. Double layer sterical stabilization mechanism ensured the high colloidal stability of samples, up to the limiting value of the hydrodynamic volume fraction (∼0.65), corresponding to saturation magnetization values of about 70 kA/m. The low-field part of the reduced magnetization curve of the most polar high concentration propanol sample is compared to those corresponding to low and medium concentration water-based samples