Bright structural colors with an angular-independent character are in increasing demand in many fields such as pigments, buildings, sensors, color displays, and anti-counterfeiting labels. However, the structural colors produced by amorphous colloidal assemblies with low refractive index contrast or without black additives often exhibit low color visibility and low liquid-bleaching resistibility. Herein, large-scale and angleindependent structural colors were constructed from Fe 3 O 4 @SiO 2 colloidal quasiamorphous arrays (QAAs) prepared through a rapid "spraying" process. Due to the high-refractive-index and intrinsic black nature of Fe 3 O 4 , the coatings exhibit high brightness of structural colors even on white substrates under ambient lighting conditions. Moreover, as-obtained structural colors possess the ability of antiliquid bleaching and solvent-responsiveness. More importantly, flexible Fe 3 O 4 @SiO 2 /PDMS photonic paper can be fabricated by permeation of PDMS into the voids of Fe 3 O 4 @SiO 2 colloidal QAAs. This QAAs-based photonic paper shows the ability to infuse silicone oils into its structure, locally swelling it and changing the reflected color. In turn, the resulting colored patterns can be easily erased by applying ethanol or low molecular weight silicone oils. The as-prepared photonic paper exhibits excellent durability and is rewritable at least 50 times without any significant changes in performance. Compared with the traditional long-range ordered photonic crystals, the rapidly prepared QAAs-based photonic coatings have unique advantages in the applications of permanents, color coatings, color printing, liquid colorimetric sensors, rewritable photonic paper, etc. because of the good structural color performance and are suitable for rapid and large-area preparation.

Olivine LiFePO4 covered flocculent carbon layers wrapped with carbon nanotubes (CNTs) prepared by sol–gel method and calcination is used as the cathode material for aqueous rechargeable lithium-ion batteries (ARLBs).

Fe 3 O 4 -Ag Janus composites were synthesized using a two-step solvothermal method. The optimal growth process was determined by investigating the relationship between the particle morphologies and reaction time. Magnetic and Raman spectroscopic measurements showed that the as-synthesized Janus composites have both good magnetic response and significant surface-enhanced Raman scattering (SERS) effects, as well as reproducibility. The calculated Raman enhancement factor reached an unprecedented magnitude of 10 9 compared with the values of other Fe 3 O 4 -Ag compounds.Furthermore, the SERS effect was exhibited even at a concentration of probe molecules as low as 10 À13 M. This demonstrates that the as-synthesized Fe 3 O 4 -Ag Janus composite particles have promise for application as separable, highly sensitive SERS substrates.