Time-resolved laser-induced incandescence characterization of metal nanoparticles

A review on determining the refractive index function, thermal accommodation coefficient and evaporation temperature of light-absorbing nanoparticles suspended in the gas phase using the laser-induced incandescence

“…Thus, the NP sizes were defined by LII together with α, which resulted in additional uncertainty. In a newer work by Sipkens et al [39], the same technique was applied. As in [43] by Daun et al in [88].…”

“…However, the LII measurements of the size distribution of NPs apart from Fe NPs have been carried out in recent years. The spectroscopic models of silicon and copper NPs [23,37,38], as well as the spectroscopic models for Ag, Fe and Mo NPs have been presented [39]. These models are based on the calculations of the electrical permittivity of the molten bulk material in dependence on the wavelength performed using Drude theory.…”

“…Later, the authors of [43] have reconsidered their calculations of molten Fe optical properties as a function of wavelength and have concluded that Drude's theory is not suitable for describing the optical properties of molten Fe [48]. In [39], the authors supposed that the dielectric properties of bulk metals could be applied directly to the NPs because the NP diameter is much larger than the mean free electron path. Thus, the spectral absorption cross-section of metal NPs is identical to that of the bulk material.…”

“…Nevertheless, as an initial approach, if any reliable data are absent, the obtained experimental data on the thermal accommodation coefficients (except data by Starke et al [80]) could be used under different investigated conditions. Dozens of articles are devoted to the uncertainty analysis of size distribution measurements using LII, but the uncertainty analyses of thermal accommodation coefficient determination have been carried out in [39,43,82]. A past study [82] has reported on the determination of the accommodation coefficient of soot in various gases from LII measurements most sensitive to perturbations in particle density, heat capacity and particle size.…”

Исследование Испарения Лазерно-Нагретых Железо-Углеродных Наночастиц При Помощи Анализа Их Теплового Излучения

“…Таким образом, углеродная оболочка наночастиц может нагреваться до той же температуры, что и железное ядро. С другой стороны, если использовать данные об оптических свойствах массивных образцов -расплавленного железа[32] и твердого графита[33] -для оценки нагрева железного ядра и оболочки, то различия в их температурах может достигать 500 K. Однако если учесть, что коэффициенты…”