Laser-induced incandescence of iron nanoparticles: effects of laser-induced sintering and coalescence.
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| Title: | Laser-induced incandescence of iron nanoparticles: effects of laser-induced sintering and coalescence. |
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| Authors: | Robinson-Enebeli, Stephen1,2 (AUTHOR) stephen.robinson-enebeli@uwaterloo.ca, Schulz, Christof2 (AUTHOR), Daun, Kyle J.1 (AUTHOR) |
| Source: | Applied Physics B: Lasers & Optics. Jul2025, Vol. 131 Issue 7, p1-15. 15p. |
| Subjects: | Sintering, Absorption cross sections, Nanoparticles analysis, Iron oxide nanoparticles, Heat losses, Aerosols |
| Abstract: | While time-resolved laser-induced incandescence is a promising technique for characterizing metal nanoparticles in the gas phase, there remain several commonly observed and unexplained features in the data, including larger-than-predicted absorption cross-sections (excessive absorption) and faster-than-predicted cooling rates immediately following peak emission (apparent anomalous cooling). In the case of low melting point metals such as iron, laser-heated aggregates coalesce into spheres (i.e., fully sinter) before the peak of the LII signal is reached. Coalescence may affect the observed TiRe-LII signals in two ways: (i) the transition from aggregates to spheres reduces the absorption cross-section, which affects both the total absorbed laser energy and the intensity of the emitted incandescence in a wavelength-dependent manner; and (ii) surface energy is converted into sensible energy of the nanoparticles, which increases their peak temperature. While the revised LII model does not completely account for the rapid signal decay immediately following the peak signal, the predicted curves align more closely with the measured intensities from coalesced particles during the later cooling times. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | While time-resolved laser-induced incandescence is a promising technique for characterizing metal nanoparticles in the gas phase, there remain several commonly observed and unexplained features in the data, including larger-than-predicted absorption cross-sections (excessive absorption) and faster-than-predicted cooling rates immediately following peak emission (apparent anomalous cooling). In the case of low melting point metals such as iron, laser-heated aggregates coalesce into spheres (i.e., fully sinter) before the peak of the LII signal is reached. Coalescence may affect the observed TiRe-LII signals in two ways: (i) the transition from aggregates to spheres reduces the absorption cross-section, which affects both the total absorbed laser energy and the intensity of the emitted incandescence in a wavelength-dependent manner; and (ii) surface energy is converted into sensible energy of the nanoparticles, which increases their peak temperature. While the revised LII model does not completely account for the rapid signal decay immediately following the peak signal, the predicted curves align more closely with the measured intensities from coalesced particles during the later cooling times. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09462171 |
| DOI: | 10.1007/s00340-025-08504-0 |
