Light Transfer Properties of Densely Packed Hydroxyapatite Bioceramic Nanocrystallite Aggregates: Why Do These Substances Have an Extremely High Albedo?

Zimnyakov D.A. Zhangylyssov K.B. Pivovarov A.V. Pichkhidze S.Y. Zdrajevsky R.A. Vereshagin D.A. Alibay T.T. Bairbayeva G.B. Koshkinbayev Y.G. Daurenbekov D.H.
June 2025 Multidisciplinary Digital Publishing Institute (MDPI)

Ceramics
2025 #8 Issue 2

Radiation transfer in layers of densely packed aggregates of hydroxyapatite nanoparticles was studied for a spectral range from 300 to 1100 nm using diffuse reflectance measurements and the modeling of the light transfer properties of the layers. The studied samples of dispersed biogenic hydroxyapatite were obtained from animal bone material (bovine bones) using fast pyrolysis followed by grinding and pressing into tablets. A distinctive feature is the high reflectivity (high albedo) of the obtained samples, which is practically independent of the wavelength in the studied spectral range and comparable to the reflectivity of the diffuse reflectance standard based on Spectralon. The modeling of the light transfer properties of the studied samples within the framework of the effective medium theory (using coherent potential approximation) made it possible to establish the weak dependence of the mean scattering-free path and the mean transport-free path of light propagation in the medium on the wavelength, which is consistent with the features observed in the experiment. Possible prospects for the use of nanostructured hydroxyapatite as photonic material are discussed.

dispersed hydroxyapatite , effective medium theory , radiation transfer , reflectivity

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Physics Department, Yury Gagarin State Technical University of Saratov, 77 Astrakhanskaya St., Saratov, 410054, Russian Federation
Precision Mechanics and Control Institute of Russian Academy of Sciences, 24 Rabochaya St., Saratov, 410024, Russian Federation
Institute of Physics, Saratov State University, 83 Astrakhanskaya Street, Saratov, 410012, Russian Federation
Institute of Physical and Technical Sciences, L.N. Gumilyov Eurasian National University, 13 Kazhymukan St., Astana, 010000, Kazakhstan

Physics Department
Precision Mechanics and Control Institute of Russian Academy of Sciences
Institute of Physics
Institute of Physical and Technical Sciences

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