Luminescence, breakdown and colouring of anodic oxide films on aluminium

Electrochemistry of molten salts

We have investigated the aluminothermic reduction of photonic chiral nematic mesoporous silica films templated by cellulose nanocrystals. The mechanical hardness and ordered structure of aluminothermally reduced materials are found to be dependent on the surface contact between aluminum and silica reactants. By heating the silica films in close contact with aluminum, the silica films undergo a surface aluminothermic reduction to generate photonic mesoporous glasses with enhanced mechanical hardness. The aluminothermic reduction of the silica is significantly enhanced when the reactants are in direct contact, transforming the helicoidal mesoporous silica films into colorful, stiff alumina/silicon replicas. Iridescent mesoporous films of corundum and corundum/silicon nanostructures are obtained from the alumina/silicon composites by selective etching of impurities. Our findings demonstrate that the aluminothermic reduction of silica is a simple process to improve the mechanical strength of chiroptical mesop...

Hard Photonic Glasses and Corundum Nanostructured Films from Aluminothermic Reduction of Helicoidal Mesoporous Silicas

Numerous research workers have studied the phenomena of oxide formation occurring on the surface of aluminum in various media under the influence of external reaction factors. The physicochemical, mechanical, and structural properties of both the thin oxide membranes and the heavier oxide layers have also been studied. The main variants of the process of oxide formation can be classified according to the character of the influencing factors.

Nucleation Mechanism in Oxide Formation During Anodic Oxidation of Aluminum

According to recent developments in the field, the term molten salts can advantageously be widened in scope to encompass many molten media which may not be wholly ionic or derived from simple salts. Thus, many systems studied within this broad classification may change their ionicity and hence conductivity according to temperature, pressure, or composition, e.g., silicates, group IIB chlorides, and chloroaluminates, respectively. Nevertheless, the majority of melts that have been studied are substantially dissociated in the liquid state, and all processes conducted in these are ipso facto electrochemical. Many of the processes considered here, therefore, involve charge transfer systems, particularly between solids (mainly metals) and melts, viz., electrode processes.(1)

Electrochemistry in Molten Salts

Electron-microscopic and optical studies on the electrocrystallization of alpha-alumina (corundum) films on aluminium☆

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Electron-microscopic and optical studies on the electrocrystallization of alpha-alumina (corundum) films on aluminium☆