The average temperature of a gas cloud formed in an aqueous solution of a gold salt under the action of a nanosecond laser-radiation pulse with a wavelength of 532 nm was calculated. It is shown that the average temperature of such a cloud reaches thousands of degrees for several nanoseconds, and the collisions of molecules in it cause the dissociation of all the chemical compounds in the cloud. As the cloud is cooled, the gold vapor is supersaturated, and solid gold clusters nucleate and grow in it. The repeated laser pulses heat not only the solution but also the gold nanoparticles formed in it, with the result that relatively large nanoparticles are evaporated, and the temperature of the particles with a radius of about 5 nm reaches only the melting point.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 92, No. 2, pp. 385–390, March–April, 2019.
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Bobb, J.A., Fisenko, S.P., Rodrigues, C.J. et al. Mechanisms of Formation of Nanoparticles in Aqueous Salt Solutions Under the Action of a High-Power Periodic Laser Radiation. J Eng Phys Thermophy 92, 369–375 (2019). https://doi.org/10.1007/s10891-019-01940-8
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DOI: https://doi.org/10.1007/s10891-019-01940-8