Abstract
A facile synthetic method for magnetochromatic Fe3O4 nanoparticles (FNPs) with controllable size and optical properties has been fabricated by the combination of an improved solvothermal method and the usage of ultrasonic irradiation in the surface modification step. The improved solvothermal method enables the alteration of the size of nanoparticles (50nm to 180nm) in a competitively convenient way by adjusting the ratio of binary solvents, including diethylene glycol (DEG) and ethylene glycol (EG). In the surface modification step, the short-chain polyacrylic acid (PAA) is added as the surfactant with ultrasound-assisted method. In this research, due to magnetically-driven assembly FNPs forming photonic crystals, the reflection peaks show blue-shift as the magnetic field is increased from 181 to 2479G. In addition, on the basis of the calculation using Bragg’s Law, the thickness of the solvent layer is measured approximately 35nm, which accounts for the magnetochromatic properties as well as excellent dispersion.
Highlights
Magnetochromatic Fe3O4 nanoparticles (FNPs), a type of colloidal photonic crystal, has been discovered and its wide application has been witnessed since decades ago
Magnetic nanoparticles were prepared by the solvothermal method in which the size of the nanoparticles can be adjusted by altering the ratio of diethylene glycol (DEG) and ethylene glycol (EG) added
We have successfully developed an improved solvothermal method to synthesize magnetochromatic Fe3O4 nanoparticles (FNPs) by the introduction of using the ultrasonic wave to assist the modification step, with a facile procedure to adjust the particle size in comparison to previous methods
Summary
Magnetochromatic Fe3O4 nanoparticles (FNPs), a type of colloidal photonic crystal, has been discovered and its wide application has been witnessed since decades ago. By using NaOH as catalyst and diethylene glycol as the reducing agent, Yin[11,12] fabricated magnetic nanoparticles of 80-180nm in size by high temperature pyrolysis and magnetochromatic nanoparticles with magnetic response characteristics by applying polyacrylic acid as stabilizer In these cases, the magnetic nanoparticles can be prepared effectively with reversible magnetochromatic properties induced by external magnetic field. The average amount of each product sample reaches a total of 230mg at a time, being more efficient than previous efforts producing 25mg approximately.[18] The products gained can display a much wider range of colors while changing the external magnetic fields This method enables us to manipulate the nanoparticles size in a way by adjusting the ratio of raw materials and obtain an increased amount of well-dispersed FNPs in water comparing to the previous efforts
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