Problems related to using nanoparticles for absorption of solar radiation and photothermal nanotechnologies are now being actively studied. The efficiency of using nanoparticles as photothermal agents for solar energy is determined by their spectral optical properties. We performed computer simulation of optical properties of homogeneous metal (nickel, titanium, and molybdenum) nanoparticles and their oxides, along with nanoparticles consisting of a metal core and an oxide shell, with radii in the range from 50 to 100 nm in the spectral interval between 200 and 2500 nm. The influence of nanoparticle radius, the type of metal and its oxide on spectral coefficients of efficiency absorption ( K _abs) and scattering ( K _sca) of radiation by nanoparticles is investigated. The type of nanoparticles suitable for absorption of solar radiation was chosen based on a comparative analysis of the wavelength dependences of absorption efficiency coefficients K _abs, intensity of solar radiation I _ S , and parameter P _1 = K _abs/ K _sca. Spherical double–layer nanoparticles consisting of nickel or titanium core and oxide shells with a radius of 75 or 100 nm can be used in the spectral interval from 200 to 2500 nm for efficient absorption of solar radiation. These results are a substantial contribution to the investigation of optical properties of nanoparticles that can be used in systems of thermal energy.
Исследованы возможности использования наночастиц для эффективного ослабления оптического излучения от различных природных или технологических источников (пожары, электрометаллургия, лазерная и плазменная обработка) с температурой поверхности излучателя в интервале 2000-4000 K на основе компьютерного моделирования. Излучение от вышеперечисленных источников может быть представлено как излучение черного тела с соответствующей температурой. Проведены исследования и анализ оптических характеристик двухслойных SiO2-Au- и Fe3O4-Au-наночастиц систем ядро-оболочка в диапазоне радиусов 25-300 nm с толщиной оболочки 5 и 10 nm для длин волн излучения в спектральном интервале 200-500 nm. SiO2-Au- и Fe3O4-Au-наночастицы являются хорошими ослабителями (поглотителями) излучения с температурой 2000-4000 K в диапазоне оптического спектра 200-5000 nm и могут применяться в качестве возможных кандидатов для эффективного ослабления оптического излучения высокотемпературных источников. Ключевые слова: двухслойные наночастицы, оптические свойства, излучение, анализ, ослабление.
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