Synthesis, Characterization, and Application of Partially Blocked Amine-Functionalized Magnetic Nanoparticles

Abstract

In this study, a novel technique was introduced for selective surface modification of amine-functionalized magnetic nanoparticles. The method was based on alignment of magnetic nanoparticles in an external magnetic field, which resulted in formation of chain-like assemblies in diluted suspensions. The aligned chains were then modified on the surface via reaction of isocyanate species with the particle functionalities. Finally, after removal from the reactor medium, particles with segmented distribution of surface functionalities were achieved. We named these partially blocked amine-functionalized magnetic nanoparticles as "Saturn" nanoparticles. Application of the particles in fabrication of magnetic assemblies was successfully demonstrated. Using methylene diphenyl diisocyanate (MDI) as the bridging agent, structures in different forms such as chains and filaments were produced by the Saturn particles and compared with cross-linked structures of the unmodified amine-functionalized particles. It is expected that this novel nanoparticle with its unique structure will have great potential in assembly fabrication with a variety of applications in biomedical fields.

Characterisation of the magnetic response of nanoscale magnetic filaments in applied fields

“…24,[27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] Most existing crosslinking procedures for synthesis of such MFs are based on the functio-nalisation of the MNP surface. 42 One-dimensional crosslinking of ferromagnetic MNPs has only been achieved in terms of rather rigid filaments or nanowires. 40,[43][44][45][46][47][48] Semi-flexible fibre structures of MNPs have been obtained instead by crosslinking them in bunches.…”

Methods of effective media as optimal methods for modeling the physical properties of nanostructures

“…2, что является, несомненно, важным для изучения материалов с заданными свойствами. Таким Методы эффективной среды как оптимальные методы моделирования физических свойств наноструктур образом, полученные в работе результаты представляют как фундаментальный, так и практический интерес в широкой области применения [14,15].…”

Symmetrized Maxwell–Garnett Approximation as an Effective Method for Studying Nanocomposites

“…В рамках данного метода можно разделить вклад различных механизмов в магнитооптические свойства нанокомпозитов. Методы эффективной среды позволяют, не разрушая структуру нанокомпозита, изучать их свойства, что найдет широкое применение в электронике и наноэлектронике [13][14][15][16].…”