Abstract
The investigations and the use of nanoparticles (NPs), as photothermal agents in light-to-heat conversion processes in nanoenergy and nanotechnology are fast growing areas of research and applications. Analytical investigation of the light-to-heat conversion by nanoparticle ensemble under radiation action was conducted. The investigation of the influence of NPs parameters (their radii, absorption efficiency factor, density and heat capacity of NP material, concentration), the characteristics of radiation (wavelength, pulse duration, radiation beam radius), the surrounding material (its density, heat capacity, and heat conduction coefficient, characteristic length of radiation extinction) on the efficiency of the light-to-heat conversion is carried out. The possibility of thermal confinement (saving NP and material thermal energy practically without heat exchange with surrounding) has been established for single NP and irradiated volume of medium with NPs for determined time intervals. These results can be used for the description of the light-to-heat conversion processes in experimental investigations in nanoenergy and nanotechnology. In this paper the analytical model of the description of light-to-heat conversion by nanoparticle ensemble, placed in medium, under radiation (laser) action has been developed. Analytical description of heating of NP ensemble under action of pulsed optical (laser) radiation and its cooling after the termination of radiation action is conducted. The dependences of NP temperature on time during the processes of NP heating and cooling, heat exchange of heated NP with environment are investigated. The temperature dependences of optical and thermo-physical parameters of NPs and surrounding medium are taken into account under modeling. The heat localization within the NP and medium (material) volumes (thermal confinements) during some time intervals without heat exchange with surrounding ambience is investigated.
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