Development of a Method for Silica-Coating of Ruby Particles

Abstract:

Silica-coating is one of simple methods to colloidally stabilize particles. The present work proposed a method for fabricating silica-coated ruby particles having a particle size of ca. 1 µm (ruby/SiO₂) by a process based on a Stöber method. Two systems were examined, which were the systems using sodium hydroxide (NaOH) and aqueous ammonia (NH₄OH) as base catalysts for a sol-gel reaction. In the NaOH system, not only the ruby/SiO₂ particles with silica shells with a thickness of ca. 61 nm but also core-free SiO₂ particles were produced by adding tetraethyl orthosilicate/ethanol solution and NaOH aqueous solution to ethanol dispersing the ruby particle powder. In the NH₄OH system, it was demonstrated that it was possible to increase the shell thickness to 132 nm by repeating addition of TEOS and NH₄OH to a mixture of ruby particles, water, and ethanol, which meant that it was found to vary the shell thickness. The ruby particles emitted luminescence even after the silica-coating, which found that the silica-coating did not deteriorate luminescence property of ruby particles.

• Periodical: Solid State Phenomena (Volume 367)
• Pages: 25-32
• DOI: https://doi.org/10.4028/p-W8avq6
• Online since: December 2024
• Authors: Mizuki Ito, Noriko Yamauchi, Kouichi Nakashima, Yoshio Kobayashi*
• Keywords: Core-Shell, Luminescence, Particle, Ruby, Silica-Coating

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