Stimuli-responsive magneto-/electro-chromatic color-tunable hydrophobic surface modified Fe₃O₄@SiO₂ core–shell nanoparticles for reflective display approaches

Abstract

Magneto-/electro-chromatic reflective color tunability is confirmed using hydrophobic surface modified magnetite nanoparticles. The optical reflective color spectra and color gamut demonstrate the promising applications in reflective displays.

Electrically Tunable Liquid Photonic Crystals with Large Dielectric Contrast and Highly Saturated Structural Colors

“…The CIE diagram shows that each points, especially those in the red region, are close to the spectral locus, which proves that the structural colors produced by the current PC are highly saturated in human vision. At the same time, these points define a larger color gamut than many reported PCs,[11a,17] which is helpful to present more perceived colors by either single or combined PC developed in this work. In the following discussions, the performance of electrically tunable PCs based on SiO 2 , CeO 2 , and CeO 2 @SiO 2 particles are compared to determine the optimized liquid PC for display unit and to find the reasons behind that.…”

Large-scale preparation of size-controlled Fe3O4@SiO2 particles for electrophoretic display with non-iridescent structural colors

“…In particular, all particles have a high surface charge, which leads to particles being driven with low voltage, and this reduces the voltage demand by at least 1 V as compared with the previous Fe 3 O 4 @SiO 2 report. 12,31 It is worth noting that an increasing electric eld causes a stronger electrostatic repulsion among the surfaces of the Fe 3 O 4 particles, which is essential to form a balance between the electrostatic repulsion and the electrophoretic force. Without a magnetic eld, dipole forces are absent because of the superparamagnetism of particles, which means the balance between the forces is mainly determined by the electrostatic repulsion and the electrophoretic force.…”

Bioinspired Stimuli‐Responsive Color‐Changing Systems

“…By changing the voltage from 0 to 10 V, the nanoparticle–nanoparticle distance is decreased; therefore, the reflective spectrum is shifted and various colors are displayed. This makes Fe 3 O 4 @SiO 2 nanoparticles promising for reflective display applications ( Figure ) . In order to create a material with lower density, higher optical contrast, and higher refractive index, hollow Fe 3 O 4 @C nanoparticles have been developed for photonic display applications .…”

“…d) Reflective color‐change behavior of the same nanoparticle ink injected into the reflective display cells depending on the applied voltage. Reproduced under the terms of the Creative Commons attribution license . Copyright 2017, Royal Society of Chemistry.…”