Abstract
Hydrophilic Fe3O4 nanoparticles with controllable size and shape have been fabricated using a facile solvothermal approach followed by surface modification with polyacrylic acid (PAA). The nanoparticles form one-dimension photonic crystal structure under external magnetic field ranging from 29.6 to 459 G. The reflection peaks of formed photonic crystals cover the entire visible spectrum, which indicates a good magnetochromatic property and prospect of wide applications. The size and shape of Fe3O4 nanoparticles are controlled by changing the ratio between ethylene glycol and diethylene glycol. In the process of surface modification, PAA synthesized by free radical polymerization was chemisorbed onto the surface of Fe3O4 particles with the aid of Fe3+ cations, which renders the particles well dispersed in aqueous solution with high thermo-stability. The Fe3O4 particles exhibit ferrimagnetism with a high saturation magnetization value of 88.0 emu/g. Both the high magnetization and the wide reflection spectrum under magnetic field make the magnetochromatic nanoparticles a promising material for visualization of the distribution of magnetic field intensity on microfluidic chips.
Highlights
Controlled synthesis of FNPs with expected size, morphology and surface properties have been studied by many groups
Li et al first reported the high saturation magnetization of monodisperse FNPs which was 81.9 emu/g for the as-prepared 200 nm nanopheres; their high yields, inexpensive synthesis process was desirable for wide application
It can be known that the volume ratio of diethylene glycol (DEG) to ethylene glycol (EG) plays an important role in the formation of the size and shape of the FNPs
Summary
Nanoparticles with Controllable received: 09 September 2015 accepted: 23 October 2015. Li et al first reported the high saturation magnetization of monodisperse FNPs which was 81.9 emu/g for the as-prepared 200 nm nanopheres; their high yields, inexpensive synthesis process was desirable for wide application Such Fe3O4 microspheres were difficult to be dispersed in aqueous media due to their large size and strong magnetic interaction[20]. The potential application of these hydrophilic Fe3O4 particles for measuring the distribution of magnetic field intensity on a chip is demonstrated, and the magnetic field intensity varying from 114 to 421 G can be visualized/imaged under an optical camera These FNPs are promising candidates for the applications of the magnetic field intensity measurement, inexpensive structural color patterning, and color display devices, etc
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