Recent research progress on the preparation and application of magnetic nanospheres

Abstract

Magnetic nanospheres have numerous applications in biomedicine, biotechnology and wastewater treatment, due to their high surface area, tunable sphere size and superparamagnetic properties. Magnetic nanoparticles can be designed and endowed with optical, electronic and fluorescent properties, allowing a wide range of functionality. Multifunctional magnetic particles with heterodimer structures allow various kinds of target molecules to be attached onto their specific parts via affinity or coordinate bonding, etc. The abilities of these nanodevices, including the encapsulation of target molecules in magnetic hybrid nanostructures and easy magnetic separation in the presence of external magnetic fields, show much promise for magnetic imaging, magnetic separation and drug delivery. Consequently, magnetic particles offer excellent potential future uses in disease diagnosis, hyperthermia, immunoassays, electrochemical biosensors, contaminated water treatment and optical detection. In this article, we review the preparation and application of inorganic and organic magnetic composite spheres in the fields of magnetic separation, drug delivery, hyperthermia, magnetic resonance imaging, and others. The size, specific surface area, structure, magnetic properties and surface functional groups of nanospheres have a great influence on their effectiveness in these applications. The encapsulation of target molecules in magnetic hybrid nanostructures and their easy separation using an external magnetic field show promise for the fabrication of novel nanodevices for many applications.

Synthesis and characterization of Piperidine-4-carboxylic acid functionalized Fe3O4 nanoparticles as a magnetic catalyst for Knoevenagel reaction

“…MNPs have high specific surface area that will be beneficial for a variety of applications, including ion exchange separation, drug delivery systems, magnetic resonance imaging, targeted gene therapy and biosensors. To enhance their performance in existing applications and to explore novel applications, understanding and controlling the effects of surface functional groups on magnetic nanospheres have become increasingly important issues for their applications [1][2][3][4][5][6].…”

Мессбауэровские исследования наночастиц FeO/Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=- типа ядро/оболочка

“…Полученные результаты были сравнены с известными для МНЧ FeO/Fe 3 O 4 типа Я/О как сфери-ческой, так и кубической формы [6,10,15,16,20,[23][24][25]. Установлено, что намагниченность сферических МНЧ FeO/Fe 3 O 4 типа Я/О больше чем кубических МНЧ FeO/Fe 3 O 4 , но эффективная анизотропия (как формы, так и обменная анизотропия) -меньше, а также меньше значение SAR.…”

Nanocrystalline ferrites used as adsorbent in the treatment process of waste waters resulted from ink jet cartridges manufacturing

“…In order to overcome these drawbacks in this study, adsorbent materials ferrite nanoparticles M II Fe 2 O 4 (M II = Mg, Cu) were used in the removal process of dye from waste waters resulting from inkjet cartridges manufacturing. It was reported that these nanoparticles presented good efficiency as reusable adsorbents due to their reduced obtaining cost, high surface area and easy recovery using their magnetic properties [9,[16][17][18][19][20]. The ferrites nanoparticles studied in this paper were obtained by thermal decomposition of coordination compounds at lower temperatures and, its superiority in comparison with other oxalate precursor methods of the mixed oxides [21].…”