Abstract
Poly(propylene imine) dendromesogens (generations from 1 to 4) have been utilized for the synthesis and stabilization of ferrimagnetic Fe2O3 nanoparticles. Reduction of Fe(iii) with further oxidation of Fe(ii) results in the formation of highly soluble nanocomposites of iron oxides in a dendrimer, which are stable under a wide range of temperatures. The magnetic iron oxide nanoparticles were investigated by MALDI-ToF MS spectrometry and elemental analysis. To establish the type of mesophase, X-ray measurements were performed at different temperatures. The calculations of X-ray results demonstrate a hexagonal columnar packing of the molecules in the mesophase. Observation of the samples by TEM gives information about the size of the compounds as well as direct evidence of the implementation of Fe2O3 nanoparticles into dendrimers. Physical parameters of the magnetic nanoparticles (magnetic moment, effective magnetic anisotropy) have been determined from analyses of the EPR data.
Highlights
Magnetic materials are key components in modern technology, with applications ranging from data storage[1] to magnetic resonance imaging contrast agents.[2]
The synthesis, characterization, liquid-crystalline properties, and supramolecular organization of the magnetic iron oxide nanoparticles in a liquid-crystalline poly(propylene imine) dendrimer and physical parameters of the magnetic nanoparticles
The procedure yields iron hydroxide inside a dendrimer matrix as an intermediate product followed by its conversion to iron oxide by means of oxidation in an oxygen current
Summary
Magnetic materials are key components in modern technology, with applications ranging from data storage[1] to magnetic resonance imaging contrast agents.[2] Magnetic iron oxide nanoparticles (MIO NPs) of different appropriate surface modi cations can be prepared using diverse physical and chemical methods.[3] Colloidal iron oxide particles (magnetite and maghemite) are generally known for their use in information technology and storage media.[4,5,6,7,8] various forms of iron oxide particles ( called ferro uids, FFs) are used for a wide range of chemical and biomedical applications including chemical and bioseparation, diagnostics, magnetic resonance imaging (MRI), magnetic uid hyperthermia, and targeting and localization of cytotoxic and radiotherapeutic drugs.[9,10,11] Magnetic particles currently employed in biomedical applications are based on ferromagnetic and superparamagnetic nanoparticles of iron oxide (magnetite Fe3O4, or maghemite g-Fe2O3, mostly 2–30 nm). The particles are usually stabilized by either their surface charge or with suitable stabilizers. Stabilization usually means coating the particles with, or encapsulation in, various
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