Photothermal effects of laser heating iron oxide and oxide bronze nanoparticles in cartilaginous tissues

Results of studying the optical properties of aqueous dispersions of iron oxide and oxide bronze nanoparticles and biogels on their basis have been presented. It has been shown that oxide bronzes obtained by mechanochemical synthesis and self-propagated high-temperature synthesis (SHS) can be used during the preparation of aqueous dispersions of nanoparticles. These nanoparticles have stable optical properties, and their aqueous dispersions and biogels are stable to aggregation and sedimentation. It has been established by spectrophotometry that the absorption of the bronze solution is mainly determined by light scattering in the visible side out of the spectral band at ∼345–365 nm. This has been confirmed by the dependence of the optical density of solutions on the wavelength. The character of light scattering changes depending on the size of the scattering disperse particles. When the hydrogen molybdenum oxide bronze nanoparticles are used as a photo-absorbing additive during the laser irradiation of the cartilaginous tissue, the photothermal effect at a wavelength of 1.56 μm is five times higher than that in the case of iron oxide nanoparticles.