| Summary: | 碩士 === 國立中興大學 === 物理學系所 === 106 === Magnetism is not easily shielded and able to apply an external stimulus in a non-contact method to cause a rapid and reversible response.These two characteristics make the magnetically responsive material unique in its application. In this study, we synthesized Fe3O4 magnetic nanoparticles and modified Fe3O4 with Poly(4-styrenesulfonic acid-comaleic acid) sodium salt (PSSMA) to have a high zeta-potential on the surface. Finally ,we dissolved Fe3O4 magnetic nanoparticles with water to make it become magnetic fluids. The magnetic fluid can form an ordered chain structure by an external magnetic field. The balance between the magnetic attraction between particles and the electrostatic repulsion force of the surface charge determines the particle spacing, resulting in the incident light produces a Bragg scattering phenomenon between the ordered chains of Fe3O4 magnetic nanoparticles. By controlling the size of the applied magnetic field, the spacing of Fe3O4 magnetic nanoparticles in the solution is changed, and the wavelength of the reflected light is then influenced to achieve the effect of discoloration. We studied the size distribution and concentration of Fe3O4 particles to optimize the range of diffraction intensity and magnetron toning. The magnetic fluid composed of Fe3O4 magnetic nanoparticles can be a rapid and reversible magnetic response, so in the future it has potential applications in optoelectronic devices, sensors and color displays.
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