Аннотация:In the present work a simple and scaleable one-pot preparation method of magnetic nanoparticles of lithium ferrites imobilized in water-soluble NaCl microcapsules has been suggested for the first time. The method is connected with an optimized ultrasonic aerosol spray pyrolysis technique with a relatively low flow-time (5 sec) and the temperature of hot zone of about 850 °C. As-prepared spinel - salt composites demonstrate excellent magnetic properties and can be used for instant preparation of stable ferrofluids containing 10-20 nm nanoparticles.