PROCESS OF COMPOSITES PREPARATION BETWEEN PARTICULATE MATERIALS AND CYCLODEXTRINS AND/OR THEIR DERIVATIVES PRODUCTS THEREOF

摘要

The present process is characterized by the mixture of an aqueous solution of metallic salts of ferrites, hydroxide in aqueous solution and cyclodextrin and/or derivatives, which yield a magnetic solid after heating. The magnetic fluid obtained does not need to be either filtered or centrifuged, for the particle size is uniform in the range of 150 nm, ranging from 0.1 to 250 mg Fe/ml through a single-step process. An important characteristic of the composites obtained in the present invention is that as they present permanent magnetization they can be driven by the relatively weak magnetic field of a permanent magnet. The composites in the present invention are also characterized by the presence of the paramagnetic properties. The composites formed may be used as magnetic adhesives, magnetic plaints, lubricants, magnetic fluids, sealers, magnetic fluids, sealers, magnetic recording media, catalysts, magnetic refrigeration, magnetically targetable drug carriers and matrices for magnetically assisted biological isolation, among other applications.