Synthesis and optical properties of highly reflective coatings based on hydroxyapatite composites
Dmitry A. Vereshagin1, Alexander V. Pivovarov2, Sergey Ya. Pichkhidze2, Dmitry A. Zimnyakov1,2,3; 1Saratov State University, Saratov, Russia; 2Saratov State Technical University, Saratov, Russia; 3Institute of Precision Mechanics and Control RAS, Saratov, Russia
Abstract
Hydroxyapatite is a narrow-band dielectric with a low refractive index and no absorption in the spectral range above 240 nm. These characteristics make it a promising material for the development of coatings with specified optical properties, including use as sunscreen filters and screens. The paper presents the results of measuring the diffuse reflectance of hydroxyapatite layers with different volume fractions of the scattering material in a silicate glue base. As a result of the analysis of the experimental data, the effect of hydroxyapatite concentration in the silicate glue matrix on the value of the transport mean free path was established. The obtained data are compared with the results of modeling within the framework of the effective medium model, known as the coated coherent potential approximation. The results of the study are of considerable interest for the development of highly reflective coatings intended for passive cooling.
Speaker
Dmitry A. Vereshagin
SSU named after N. G. Chernyshevsky, Institute of Physics
Russian Federation
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