Mechanisms of Formation of Nanoparticles in Aqueous Salt Solutions Under the Action of a High-Power Periodic Laser Radiation

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 th...

Full description

Saved in:
Bibliographic Details
Published in:Journal of engineering physics and thermophysics 2019-03, Vol.92 (2), p.369-375
Main Authors: Bobb, J. A., Fisenko, S. P., Rodrigues, C. J., El-Shall, M. S., Tibbetts, K. M.
Format: Article
Language:English
Subjects:
Classical Mechanics
Complex Systems
Engineering
Engineering Thermodynamics
Heat and Mass Transfer
Industrial Chemistry/Chemical Engineering
Laser beams
Nanoparticles
Nanostructures
Precious metal products
Radiation (Physics)
Thermodynamics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1062-0125
1573-871X
DOI:10.1007/s10891-019-01940-8