Effect of confined geometry on the size distribution of nanoparticles produced by laser ablation in liquid medium

Choudhury, Kaushik Roy; Singh, Rajesh; Kumar, Prasoon; Ranjan, Mukesh; Srivastava, Atul; Kumar, Ajai

doi:10.1016/j.nanoso.2018.12.006

Cited by 15 publications

(6 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It may be clearly seen that due to faster rate of cooling post-recalescence, the features developed on the surface of the solidified spherule under sub-atmospheric conditions are smaller compared to the features observed on its counterpart cooled under atmospheric condition. This corroborates the results reported by researchers that faster cooling and higher extent of undercooling lead to finer surface structures 40,41 . It is to be highlighted here that the images shown in Fig.…”

Section: Solidification Textures Under Atmospheric and Sub-atmospherisupporting

confidence: 93%

“…The electron micrographs of the surface features of the crystallised samples showed the presence of large-sized surface textures in the case of lower level of cooling rates, whereas, surface features were found to be relatively very small when the molten droplet was subjected to higher cooling rate at 400 K/s. These observations are along the expected lines and may be explained on the basis of the availability of cooling time for the highly undercooled molten droplet 38 – 40 .…”

Section: Resultssupporting

confidence: 64%

See 1 more Smart Citation

Experiments to understand crystallization of levitated high temperature silicate melt droplets under low vacuum conditions

Mishra

Manvar

Choudhury³

et al. 2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

We report experiments on crystallization of highly undercooled forsterite melt droplets under atmospheric and sub-atmospheric pressure conditions. Experiments have been conducted under non-contact conditions using the principles of aero-dynamic levitation. Real time dynamics of solidification, along with the transient evolution of surface textures, have been recorded using high speed camera for three cooling rates. These images have been matched with the time-tagged temperature data to understand the effect of pressure conditions and cooling rates on the crystallization dynamics. Compared to normal pressure, relatively higher levels of undercooling could be achieved under sub-atmospheric conditions. Results showed a strong dependence of surface textures on pressure conditions. For any externally employed cooling rate, relatively small length scale morphological textures were observed under sub-atmospheric conditions, in comparison to those achieved under ambient conditions. The observed trends have been explained on the basis of influence of pressure conditions on recalescence phenomenon and the rate at which latent heat of crystallization gets dissipated from the volume of the molten droplet. Sub-atmospheric experiments have also been performed to reproduce one of the classical chondrule textures, namely the rim + dendrite double structure. Possible formation conditions of this double structure have been discussed vis-à-vis those reported in the limited literature. To the best of our knowledge, the reported study is one of the first attempts to reproduce chondrules-like textures from highly undercooled forsterite melt droplets under sub-atmospheric non-contact conditions.

show abstract

Section: Solidification Textures Under Atmospheric and Sub-atmospherisupporting

confidence: 93%

Section: Resultssupporting

confidence: 64%

Experiments to understand crystallization of levitated high temperature silicate melt droplets under low vacuum conditions

Mishra

Manvar

Choudhury³

et al. 2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…A study on ZnO NPs [94] showed that the nanostructure and particle concentrations heavily rely on laser input parameters. Furthermore, particle size control could be established using the method adopted by Choudhury et al [95], where the target geometry (Cu and Au) was confined to a limited space due to which the generated shockwave reflected from the confined boundary and interacted with the plasma plume, leading to longer nucleation and hence the formation of larger NPs.…”

Section: Np Formation and Releasementioning

confidence: 99%

Influence of Laser Process Parameters, Liquid Medium, and External Field on the Synthesis of Colloidal Metal Nanoparticles Using Pulsed Laser Ablation in Liquid: A Review

2022

View full text Add to dashboard Cite

Pulsed laser ablation in liquid, used for nanoparticle synthesis from solid bulk metal targets (a top-down approach), has been a hot topic of research in the past few decades. It is a highly efficient and ‘green’ fabrication method for producing pure, stable, non-toxic (ligand-free), colloidal nanoparticles, which is often challenging using traditional chemical methods. Due to the short time scale interaction between the laser pulses and the target, it is difficult to achieve complete control on the physical characteristics of metallic nanoparticles. Laser process parameters, liquid environment, and external fields vastly effect the shape and structure of nanoparticles for targeted applications. Past reviews on pulsed laser ablation have focused extensively on synthesising different materials using this technique but little attention has been given to explaining the dependency aspect of the process parameters in fine-tuning the nanoparticle characteristics. In this study, we reviewed the state of the art literature available on this technique, which can help the scientific community develop a comprehensive understanding with special insights into the laser ablation mechanism. We further examined the importance of these process parameters in improving the ablation rate and productivity and analysed the morphology, size distribution, and structure of the obtained nanoparticles. Finally, the challenges faced in nanoparticle research and prospects are presented.

show abstract

“…It ranges typically between 1 and 50 nm, although many nanoparticles below 10 nm are identified throughout the samples observed. In addition, a small number of spherical nanoparticles with diameters above 50 nm are seldom observed and do not seem representative, but are probably generated by either shockwave induced expulsion of droplets from the thin melt layer at the exposed target surface [55,56], or by prolonged thermalization of the plasma plume confined within a cavitation bubble [57], via reflected shockwaves during continuous oscillating expansion and contraction of its volume [58]. The transformation of the solid NiFe 2 O 4 target into the observed nanoparticles must take into account that, at a pulse width of 800 ps and a near-IR irradiation wavelength, laser ablation may simultaneously include several mechanistic pathways.…”

Section: Tem Analysismentioning

confidence: 99%

Structure, magnetic, photocatalytic and blood compatibility studies of nickel nanoferrites prepared by laser ablation technique in distilled water

Özçeli̇k

Yalçın

Arda

et al. 2021

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Effect of confined geometry on the size distribution of nanoparticles produced by laser ablation in liquid medium

Cited by 15 publications

References 46 publications

Experiments to understand crystallization of levitated high temperature silicate melt droplets under low vacuum conditions

Experiments to understand crystallization of levitated high temperature silicate melt droplets under low vacuum conditions

Influence of Laser Process Parameters, Liquid Medium, and External Field on the Synthesis of Colloidal Metal Nanoparticles Using Pulsed Laser Ablation in Liquid: A Review

Structure, magnetic, photocatalytic and blood compatibility studies of nickel nanoferrites prepared by laser ablation technique in distilled water

Contact Info

Product

Resources

About