MAGNETIC CORE-SHELL PARTICLES WITH HIGH SEPARATION EFFICIENCY

• Main Authors: KATUSIC, STIPAN, MICHEL DE AREVALO, AYMEE LISETTE, KRESS, PETER, HERZOG, HARALD, MEYER; JÜRGEN
• Format: Patent
• Language: English; French; German
• Published: 13.05.2015
• Subjects: ADHESIVES; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; DYES; ELECTRICITY; INDUCTANCES; INORGANIC CHEMISTRY; MAGNETS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; POLISHES; PREPARATION OF CARBON BLACK; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES

Functionalized magnetic core-shell particles which are present predominantly in the form of isolated, essentially spherical individual particles, the core of which consists essentially of one or more magnetic iron oxides, the shell of which consists essentially of impervious, amorphous silicon dioxide, and the functionalization of which consists of amino or epoxy group units on the surface of the particles, and which additionally have a mean particle diameter d50 such that 2<d50<10 μm, the particles have a content of iron oxide of 83 to 92% by weight, of silicon dioxide of 5 to 15% by weight, and of carbon of 0.5 to 3% by weight, the amino or epoxy group is part of the structural unit -OSi-alkyl-X where X is NH2 or epoxy and alkyl is C2-C8, and the concentration of the amino groups or of the epoxy groups is at least 30 μmol/g of particles. The particles are used for immobilization of enzymes.