Correlation between irradiation conditions and nanoparticles obtained in case of laser ablation of aluminum targets in liquids

Synthesis and Characterization of Aluminum Nanoparticles Prepared in Vinegar Using a Pulsed Laser Ablation Technique

“…The presence of such a peak (below 250 nm) indicates the formation of aluminum nanoparticles 3 Journal of Nanomaterials in the suspension [8]. Previous studies [8,13,15] reported that a peak around 200 nm corresponds to nanoparticles in the range of 10 nm in diameter and that a red shift is associated with larger particles [13]. Moreover, Figure 2(a) shows a wide absorption shoulder in the domain 300-400 nm, which is attributed to nanoparticles with a core-shell structure [13,15].…”

“…Previous studies [8,13,15] reported that a peak around 200 nm corresponds to nanoparticles in the range of 10 nm in diameter and that a red shift is associated with larger particles [13]. Moreover, Figure 2(a) shows a wide absorption shoulder in the domain 300-400 nm, which is attributed to nanoparticles with a core-shell structure [13,15]. TEM images of the suspension, as illustrated in Figures 2(b) and 2(c), indicate the existence of nanospheres varying in size from 2 nm to 50 nm.…”

“…However, the nanomaterials obtained through this method depend greatly on the used liquid medium [8,9], laser wavelength [10], laser energy [11][12][13], and irradiation time [8] along with other parameters. Applying the first harmonic wavelength of a Nd:YAG laser (λ = 1064 nm), irradiated aluminum targets immersed in ethanol, acetone, or ethylene glycol resulted in Al nanoparticles with different diameters ranging between 30 and 100 nm [8,9].…”

Nonlinear reflection of a nanosecond laser pulse from thin aluminum film in the temperature range 2–14 kK

“…The study of the thermodynamic cycles of heating and the cooling of metals produced under powerful laser radiation is of great practical importance because of the possibility of achieving the critical point region of the phase diagrams of metals [1,2] where the difference between solid, liquid and gaseous phases becomes obliterated. The results of such investigations are also significant with respect to the synthesis of nanoparticles as they have strongly defined geometrical parameters and physical properties [3][4][5][6]. To determine the parameters of the thermodynamic cycle it is necessary to carry out precise measurements of the temperature of a studied metal with a high temporal resolution.…”

“…Under these conditions the pressure within the subsurface region of the metal target reaches a tenth of a bar. The influence of the plasma torch can be reduced when the irradiated metal is placed into a liquid [6,[8][9][10] or when the irradiated metal surface is confined by a transparent dielectric [11][12][13]. In the current case the plasma formation takes place Nonlinear reflection of a nanosecond laser pulse from thin aluminum film in the temperature range 2-14 kK A A Karabutov 1,2 , A G Kaptilniy 3 , D M Ksenofontov 4 , V A Makarov 1,5 , E B Cherepetskaya 2 and N B Podymova 2,5 at a higher temperature and the subsequent plasma expansion causes a shock wave with the pressure amplitude being higher than in the absence of the mechanical confinement.…”