An iridescent film of porous anodic aluminum oxide with alternatingly electrodeposited Cu and SiO₂ nanoparticles

Abstract

The structurally colored surface of anodic aluminum oxide (AAO) is highly useful for decoration and anti-counterfeiting applications, which are of significance for both scientific and industrial communities. This study presents the first demonstration of the fabrication of an iridescent film of porous AAO on an industrial aluminum alloy substrate, with alternatingly electrodeposited Cu and SiO2 nanoparticles (NPs). A rainbow effect was effectively obtained for the optimized sample with appropriate alternating electrodeposition times. The structure and optical properties of a series of the electrodeposited AAO-based thin film were investigated. The Cu and SiO2 NPs were found to be uniformly deposited into the porous structure of the AAO film, and the alternating electrodeposition repeating twice led to the formation of the optimal AAO-based thin film that exhibited a rainbow effect and superior anti-corrosion performance.

Fano resonant optical coatings platform for full gamut and high purity structural colors

“…The iridescence properties of FROCs can be controlled by simply changing the refractive index of the dielectric cavity material. Note that tunable iridescence is a desired property in many applications, e.g., anti-counterfeit measures 12 , 21 . Figure 4a shows a swatch array (angle of incidence vs. dielectric cavity material refractive index) for a range of FROCs with constant dielectric cavity optical length , where is the dielectric index and is its thickness.. At high refractive index FROCs exhibit low iridescence (relatively unchanged color reflectance) over a wide angular range .…”

Biodegradable Polylactide/TiO2 Composite Fiber Scaffolds with Superhydrophobic and Superadhesive Porous Surfaces for Water Immobilization, Antibacterial Performance, and Deodorization

“…Conversely, the average number of the viable bacteria cells on the standard control test specimen in the absence of the ES PLA/TiO 2 fibers was dramatically increased after the 24 h of visible light irradiation, likely because bacterial proliferation readily proceeded without the inhibition effect from the destructive reactive oxygen species generated by the photocatalytic reactions over the PLA/TiO 2 fibers. As a result, the as-prepared PLA/TiO 2 fibers can find promising antimicrobial applications by considering its high antibacterial efficiency, as well as its robust and portable merits that cannot be obtained in the traditional powdery samples [34,35,36,37,38,39,40,41,42,43,44,45,46]. R 1 = (( N 0 – N 24h )/ N 0 ) × 100…”