Effects of ethanol on the efficiency of the formation of anodic alumina in sulfuric acid

Enhancing Forbidden Light Propagation in Nanoporous Anodic Alumina Gradient-Index Filters by Alcohol Additives

“…These observations are in good agreement with previous studies analyzing the effect of alcohol additives on NAA produced under steady, nonpulsed mild anodization conditions in sulfuric acid electrolytes. 44,45 Rise in the voltage output upon increment of alcohol additive concentration at constant input current density was attributed to changes in the dielectric constant, viscosity, and conductivity of the acid electrolyte. It was also pointed that addition of alcohol additives does not affect the growth rate of the anodic film, but it minimizes its progressive dissolution in the acid electrolyte during anodization.…”

“…It is apparent from analysis of D P that addition of alcohol additives minimizes the dissolution rate of the resulting anodic film during the anodization process, which is in good agreement with previous observations. 44,45 However, in contrast to NAA films produced under a constant input current density, analysis of L TP reveals that addition of alcohol additives to the acid electrolyte significantly alters the growth rate of the anodic film under dynamic current density input conditions. This result is further validated by analyzing the effect of alcohol additives on the position of the characteristic PSB of NAA-GIFs (λ PSB ), which is found to red-shift with increasing [alcohol] for all additives used in this study (vide infra).…”

“…38−43 Studies using alcohol additives to produce NAA films under steady mild anodization conditions focused on assessing their impact on the geometric features of nanopores and the Coulombic efficiency of anodization under these conditions. 44,45 Herein, the effect of alcohol additives on the structural, chemical, and optical properties of NAA-GIFs produced by sinusoidal pulse anodization under mild conditions is elucidated (Figure 1a). Comprehensive analysis of key physical and chemical features of NAA-GIFs and output electrochemical signals allows us to determine the interplay between type [methanol, ethanol, isopropanol, and ethylene glycol] and concentration (10−70 vol %) of alcohol additives in engineering the structure of these NAA-based PCs (Figure 1b,c).…”

Recent Advances in Nanoporous Anodic Alumina: Principles, Engineering, and Applications

“…It was recently demonstrated that addition of ethanol improves the formation of NAA in sulfuric acid, suppressing its chemical dissolution and the anodization rate. What is more, the anodization was possible even with 50% ethanol content in the electrolyte [ 98 ]. Another common additive is ethylene glycol.…”

Effect of alcohol addition on the structure and corrosion resistance of plasma electrolytic oxidation films formed on AZ31B magnesium alloy

“…35 Moreover, in recent years, we found that the addition of alcohol into an electrolyte improves the formation efficiency of anodic alumina on aluminum during mild anodization. 36,37 Based on this knowledge, we focused on the effect of alcohol as an additive and investigated the inuence of electrolyte composition on the properties of PEO lms. Sodium phosphate (Na 3 PO 4 ), which is generally used for the PEO process, was used as the main electrolyte, whereas sodium silicate (Na 2 SiO 3 ) was used for comparison.…”