Abstract
The size and solvent dependence of magnetically responsive photonic crystals was investigated using carbon-encapsulated superparamagnetic magnetite nanoparticles as building blocks. The wavelength dependence of the optical diffraction on particle size was demonstrated using colloidal nanoparticles spherical in shape and having an average diameter of 100, 150, 200, and 250 nm. A colloidal suspension with a particle size of 250 nm can only diffract red light, whereas the suspension with a particle size of 100 nm can only diffract blue light, no matter how the magnetic induction changes in strength. The solvent-dependent diffraction of photonic crystals under an external magnetic field was carried out by dispersing the colloidal nanoparticles in solvents, including acetone, ethanol, DMSO, and water. It is shown that the reflection rate was reduced as the hydrogen-bonding ability of the solvent increased.
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