Abstract
The present work proposes a method for fabricating metallic Al particles in aqueous solution. An aqueous colloidal solution was prepared from an aqueous aluminum nitrate nonahydrate solution by electrolysis using metallic Al plates as the anode and cathode under ultrasonic irradiation in water at 25–45 °C. The sizes of the particles in the colloidal solutions prepared at 25, 35, and 45 °C were 76.3, 77.0, and 84.7 nm, respectively. The powder obtained from the colloidal solution prepared at 25 °C was not crystalline. By contrast, the powders obtained from the colloidal solutions prepared at 35 and 45 °C had a crystal structure of cubic Al and crystal sizes of 55.7 and 59.3 nm, respectively. Thus, elevated temperatures promoted both particle growth and crystal growth, which was explained by higher temperatures increasing the frequency and energy of particle collisions. The metallic Al particles were chemically stable in both an aqueous solution and the ambient atmosphere. The chemically stable metallic Al particles are expected to be used as sources for fabricating materials related to fuels, energy storage, and pigments.
Highlights
Nanoparticles and microparticles of metallic materials are widely known to exhibit properties that differ from those of the corresponding bulk materials
If the metallic particles deposited onto the electrode can be dispersed in the electrolyte, the dispersion can yield a colloidal solution of metallic particles
We extend our method used to prepare metallic-Zn-particle colloidal solutions in water by electrolysis to prepare high-purity metallic Al particles via a simple method with low environmental impact, which is challenging
Summary
Nanoparticles and microparticles of metallic materials are widely known to exhibit properties that differ from those of the corresponding bulk materials. Particles of noble metals such as Au, Pt, and Ag can be synthesized via the reduction of metal ions in aqueous solution [13,14,15]. Metallic Al particles can be synthesized via a process based on the reduction of A l3+ ions in organic solvents [17, 18]. If the metallic particles deposited onto the electrode can be dispersed in the electrolyte, the dispersion can yield a colloidal solution of metallic particles.
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