Nanotechnologies of the Treatment and Production of Complex Transition Metal Oxides with High Photothermal Effect

The ability to create biofunctional nanoparticles of A х O · BО y complex oxides (A = K, Н, Na; B = Ti, Mo, W; 0 < x < 2; y = 2, 3) produced via self-propagating high-temperature synthesis is considered in the present study. Nanoparticles (5–10 nm) and stable aqueous colloidal solutions on their basis are obtained via fragmentation, nanoparticle size separation, magnetic separation, and functionalization with biocompatible gels (starch and polyvinyl pyrrolidone). The optical methods for controlling nanoparticle sizes in solution are developed as well. The optical absorption spectra of colloidal solutions of K x WO 3 nanoparticles are acquired at wavelengths of λ =1.45 and 1.56 μm and the monochromatic absorption coefficients of bronze nanoparticles are measured at colloid concentrations of 10 to 35 mg/mL. Evaluation of photothermal effects reveals that the greatest impact of laser radiation (λ = 1.45 μm) is achieved in K 0.4 WO 3 nanoparticles. Powdered K x TiO 2 complex oxide subjected to mechanical treatment is found to gain magnetic properties. The electrical conductivity of K x TiO 2 powder is measured versus temperature over a range of 25–270°С and is shown to be an order of magnitude greater with rising temperature to ~200°С. Data gathered in this study can be used for creation of biofunctional nanomaterials with high photothermal effects.