Optically Tunable Functional Nano-Coatings on Fly Ash-Based Ceramics

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This waste reutilisation project develops a novel nanotechnology of coated fly ash particles to simulate titania as paint pigment/filler. The strategy uses a novel high-temperature injector fluidised bed reactor to make tunable coatings of graded SiO2/ZnO/TiO2 layers of increasing refractive index to enhance total internal reflection and scattering to increase whiteness and opacity; doping of the TiO2 neutralises colour and reduces paint chalking. These advanced nanoscale coated materials are a new direction for a long-term partnership between the CI and KIP in materials development. The laboratory- to pilot-scale manufacturing extension will enable high-volume use in paints generating significant economic and environmental outcomes.