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Mechanochemical surface functionalisation of superparamagnetic microparticles with in situ formed crystalline metal-complexes

A fast novel core–shell particle formation method
: Brede, Franziska Andrea; Mandel, Karl-Sebastian; Schneider, Martin; Sextl, Gerhard; Müller-Buschbaum, Klaus


Chemical communications 51 (2015), Nr.41, S.8687-8690
ISSN: 0022-4936
ISSN: 0009-241X
ISSN: 1359-7345
Fraunhofer ISC ()
Mikropartikel; Funktionalisierung; Superparamagnetismus; Werkstoffe

An innovative mechanochemical method is reported for the in situ formation of crystalline metal-complexes on the surface of superparamagnetic nanocomposite microparticles. The process is demonstrated for coating Fe3O4 multicore-silica matrix particles with the 1,2,4-1H-triazole complex [ZnCl2(TzH)2]. The use of mechanochemistry demonstrates a flexible process to obtain functional shells on magnetic particle cores without the need for complicated surface-functionalisation reactions in solution. Simple mixing of the desired shell-precursors ZnCl2 and 1,2,4-1H-triazole (TzH) with the magnetic particles in a ball mill is sufficient to tailor the particle surfaces with novel functionalities while retaining the superparamagnetic behaviour.