In-line monitoring and modelling of particle size reduction of hexagonal boron nitride (hBN) suspension in femtosecond laser processing

This study investigates the particle-size reduction of hexagonal boron nitride (hBN) suspensions under femtosecond-laser irradiation. We propose an in-line monitoring method that uses transmission spectroscopy (TS) in the visible wavelength region to evaluate the changes in particle-size distributio...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2024-11, Vol.57 (43), p.435207
Main Authors: Muneoka, Hitoshi, Koike, Takeru, Ito, Tsuyohito, Terashima, Kazuo, Miura, Eisuke
Format: Article
Language:English
Subjects:
femtosecond laser
hexagonal boron nitride
process monitoring
size reduction
Ångström exponent
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Summary:This study investigates the particle-size reduction of hexagonal boron nitride (hBN) suspensions under femtosecond-laser irradiation. We propose an in-line monitoring method that uses transmission spectroscopy (TS) in the visible wavelength region to evaluate the changes in particle-size distribution. The Ångström exponent ( α ), derived from the wavelength dependence of optical thickness, is employed as an indicator of particle-size reduction. The effectiveness of α is validated through comparison with particle-size distributions obtained by the particle tracking method. We demonstrate real-time monitoring of particle-size variation in a flow system using in-line TS measurements. The dependence of α on laser energy and hBN concentration is also investigated. Furthermore, we introduce an indicator, the average number of size-reduction events per particle ( N SR ), and a model for estimating it under various experimental conditions. The N SR indicator and the model for its derivation provide a unified understanding of the experimental results obtained under various conditions, such as treatment volume, laser energy, and hBN concentration, suggesting that they capture the essential aspects of laser propagation in the suspension and the particle-size reduction process. This study highlights the potential of α as an in-line process monitoring tool and the significance of the N SR indicator and its model in understanding the underlying mechanisms of laser processing for particle-size reduction in suspensions.
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/ad66df