Preparation and magnetochromic discoloration of ferroferric oxide magnetically responsive photonic crystals
TIAN Zhaoxia1,2, WU Zhisheng1, XIAO Wei2, XU Gaojie2, LIU Fenghua2
1. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China; 2. Zhejiang Key Laboratory of Additive Manufacturing Materials, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Abstract：Magnetically responsive ferroferric oxide (Fe3O4) nanoparticles were prepared by solvothermal method using ferric trichoride (FeCl3) as the iron source and poly (styrene sulfonic acid-co-maleic acid) (PSSMA) sodium salt with two different chemical structures as surfactants. The effects of PSSMA surfactants with different structures and reaction conditions on the morphology, particle size, and photonic properties of Fe3O4 nanoparticles were investigated. The results show that the Fe3O4 particles are nearly spherical and surface is rough when using PSSMA with n(SS)∶n(MA)=1∶1 as surfactant in strong alkali environment, and particle size increases with increasing water content. Using PSSMA with n(SS)∶n(MA)=3∶1 as surfactant in weak alkali environment, the particles are regular spherical and surface is smooth, and the size increases with increasing Fe3+ content. It is more suitable for the generation of superparamagnetic Fe3O4 nanoparticles with uniform particle size and good monodispersity in weak alkaline environment due to the more abundant sulfonic acid group on the surface. This Fe3O4 nanoparticle dispersion system can rapidly form ordered photonic crystal nanoparticles under the action of external magnetic field, and obtain excellent tunable structure color.
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2023, Vol. 28 
