Heat Transfer in a Water Drop Containing a Dye and Nanoparticles under Double Laser Irradiation
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Heat Transfer in a Water Drop Containing a Dye and Nanoparticles under Double Laser Irradiation N. A. Myslitskayaa,*, R. Yu. Borkunovb, M. V. Tsar’kovb, V. A. Slezhkina, I. G. Samusevb, Yu. N. Antipova, and V. V. Bryukhanovb a b
Kaliningrad State Technical University, Kaliningrad, 236022 Russia Immanuel Kant Baltic Federal University, Kaliningrad, 236041 Russia *e-mail: [email protected]
Received July 8, 2019; revised January 31, 2020; accepted February 12, 2020
Abstract—Heat transfer in a water drop containing eosine and ablation silver nanoparticles induced by stationary visible laser irradiation, λ = 532 nm, and pulsed IR laser irradiation, λ = 10.6 μm (VIS–IR double laser irradiation), has been studied in the temperature interval of 0.2–50°C. It has been found that the vibratory system of triplet states in a dye molecule heats up after VIS–IR laser irradiation, causing thermoluminescence. The thermoluminescence decay kinetics indicates a new distribution of electron vibration modes in the fluorescence spectrum of dye molecules. If the drop with nanoparticles is small (d < 1 mm), pulsed IR irradiation (τ = 50 ms) gives rise to a thermal front causing thermoluminescence, which travels in the drop with a velocity of 0.85 cm/s. Heat transfer in the drop during the formation of a thermal wave has been simulated. DOI: 10.1134/S1063784220080137
INTRODUCTION Thermal processes in a water drop containing metal nanoparticles, molecules of organic substances, and biological objects are of great practical interest for gaining insight into the kinetic processes of heat and of mass transfer under the action of electromagnetic radiation [1–6]. A considerable amount of research has been devoted to thermal, radiation, and laser action on a suspended water drop or a drop placed on a hydrophobic or hydrophilic surface [7–11]. In addition, much attention was paid to developing spectral and optical techniques to determine the thermal and kinetic parameters of the drop subjected to vibration and acoustic actions [12–14]. Many engineering installation diagrams can easily be found in the literature today. For example, various ways of generating and detecting thermal fluxes in a drop with different ingredients inside in the presence of a temperature gradient and thermodiffusion (the Soret effect) were described [15–18]. Thus, micrometer-size drops of pure liquids or solutions on their basis, as well as disperse systems (including with nanoparticles), are important objects for studying physical processes in condensed media. The line of research on processes in a water drop was selected based on achievements in the nanophotonics of condensed media [19, 20]. New techniques for gaining insight into thermophotophysical pro-
cesses in liquids were described in [21]. Here, we investigate the conversion of the electron vibration excitation energy in a suspended water drop containing a dye and silver nanoparticles in the temperature range of 0.2–50°C. An experimental setup and a technique for VIS (λ = 532 nm)–IR (10.6 μm) laser irr
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