The authors have used ps laser to make nanoparticles

    • [PDF File]Production of Nanoparticles with High Repetition Rate Picosecond Laser

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      in liquids was studied. The maximum productivity of 8.6 µg/s nanoparticles was achieved with the 10 ps-laser pulses at high pulse energy (110 µJ) and the repetition rate of 50 kHz. A special stirred flow chamber was constructed in order to improve reproducibility and generation speed of nanopar-ticles in flowing liquid during the ps-laser ablation.

    • [PDF File]GENERATION OF METAL NANOPARTICLES BY LASER ABLATION V. Dudoitis, V ...

      https://info.5y1.org/the-authors-have-used-ps-laser-to-make-nanoparticles_1_9514c8.html

      acteristics of particles generated by laser ablation are not fully known. Therefore, the studies of particle concentration and their size distribution are hot topics in current laser ablation investigations recently [1–9]. Nanoparticle generation by laser ablation is used for a variety of applications such as biotechnology, elec-tronic industry, etc.

    • [PDF File]Laser rapid thermal annealing enables tunable plasmonics in nanoporous ...

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      The as prepared NPG nanoparticles were annealed using a 785 nm continuous wave (CW) titanium:sapphire (Spectra- Physics 3900S) laser. Different laser intensities (125, 190, and 250 mW mm−2) were used for 120 seconds of exposure. Laser annealing was applied to the nanoparticles on the original glass substrate in air.

    • [PDF File]Nanoparticles by Laser Ablation - ResearchGate

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      the mechanisms and models involved in the generation of nanoparticles by laser ablation, clarifies the differences between nanoparticle generation in gaseous and liquid environments,

    • The fragmentation mechanism of gold nanoparticles in water under ...

      monic nanoparticles with ultrafast laser pulses and underlines the need for in situ observations to unravel the mechanisms of related phenomena. Laser irradiation of plasmonic nanoparticles in aqueous solu-tion gives rise to a dizzying array of phenomena that are o en difficult to disentangle.1–6 The optical forces exerted on the

    • [PDF File]Mechanisms of Nanoparticle Formation by Laser Ablation - IntechOpen

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      The presence of nanoparticles in the laser plume is then explained by using a Zel dovich-Raizer condensation model (Zeldovich, 1966; Luk yanchuk et al., 1998; Gusarov et al., 2000). This approach is appropriate for interpretation of the experimental findings obtained in laser ablation with hundred of nanoseconds and longer laser pulses,

    • [PDF File]Optics and Laser Technology - Federal University of Rio Grande do Norte

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      nanoparticles, as also the efficiency of PLAL method, have been widely investigated [26–30]. In Boutinguiza and co-authors [1] a laser fluence of 100 J/cm2 was used to produce Ag NP’s and they obtained particles with a mean size of 15 nm. However, in Vinod [31] and Al-Azawi [27], the authors have used lower laser fluence

    • [PDF File]Influence of processing time on nanoparticle generation during ...

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      ran. Laser ablation in stationary liquid involves simultane-ously the fabrication of nanoparticles by ablation of the tar-get material and fragmentation of dispersed nanoparticles by post irradiation. The ratio in which the laser pulse energy contributes to these processes depends on laser wavelength and colloidal properties.

    • Laser-induced incandescence applied to dusty plasmas - Institute of Physics

      This paper deals with the heating of nanoparticles by UV irradiation (pulsed laser). The nanoparticles (diameters up to 1 m) are confined in and synthesized by a reacμ - tive argonacetylene plasma at 10 Pa gas pressure. Upon – irradiation with short ∼150 ps and high-energy (∼63 mJ) UV (355nm) laser pulses, the particles reach a sufficient

    • [PDF File]Generation of NiO nanoparticles via pulsed laser ablation in deionised ...

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      In this paper, the authors investigated the effect of changing ablation time and laser energy on synthesised NiO nanoparticles by laser ablation in liquid. The anti-bacterial activities of these nanoparticles with or without amoxicillin on cultures of Gram-negative and Gram-posi-tive bacteria were also tested. 2 Experimental mehodst

    • Nanoparticle-assisted acceleration of laser-irradiated low-density He ions

      2 nanoparticles [9–11], mapping laser absorption by ion emission measure-ment [12] or accelerating electrons in nanoplasmonic resonant systems [13], have been observed in laser-irradiated nanopar-ticles. Attractive application areas for laser-irradiated clusters and nanoparticles include generation of high-order harmonics

    • Pilot-scale synthesis of metal nanoparticles by high-speed pulsed laser ...

      ideal candidate for large-scale PLAL, the laser system is used to increase the productivity of laser-generated metal nano-particles. The experimental setup is depicted in figure 1(b). Nanoparticles are synthesized by ablating different metal Figure 1. Schematic showing the laser ablation in liquid setup. (a) An ultrafast high-power laser beam (500W, 3ps, 1MHz–10 MHz)

    • [PDF File]Effect of Bed Temperature on the Laser Energy Required to Sinter Copper ...

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      using pulsed lasers and have also reported on the impact of substrate diffusivity on the fluence/irra-diance requirements for sintering of Cu NPs.1 ,14 15 In this study, the authors present their experimen-tal findings on the sintering irradiance require-ments using a continuous wave (CW) laser and compare them with the results from pulsed laser

    • Characterization and Manipulation of Single Nanoparticles Using ...

      fluorescent nanoparticles. Furthermore, we also have tried nanopore blockage using positively charged nanoparticles (see supplementary information S3). In such cases, the nanoparticles would not be trapped near the nanopore, but physically block the pore due to strong electrostatic interactions with the pore surface.

    • Laser-Induced Optothermal Response of Gold Nanoparticles: from a ...

      laser photoabsorbers like metal nanoparticles (NPs) [9–12], carbon-based materials [13–15], organic com-pounds [16], indocyanine green [17], natural chromo-phores [18], and synthetic coordination polymers (eg, Prussian blue) [19,20] to generate the necessary heat for thermally ablating cancerous cells exposed to NIR laser irradiation.

    • [PDF File]A. P. Caricato, A. Luches, and M. Martino

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      Laser NP production is based on the ablation mechanism. The laser systems for nanoparticle production have the same components as the ones used for PLA deposition of thin films: a pulsed laser, a beam-handling optics, a target, and a substrate, usually placed in a vacuum chamber (Fig. 1). The peculiarity of interac-

    • Sub-picosecond passively mode-locked thulium-doped fiber laser by ReS2 ...

      nanoparticles in the passively mode-locked thulium-doped fiber laser (TDFL) at 2μm waveband. The ReS 2 nanoparti-cles are utilized into the laser cavity on a side polished fiber through optical deposition method. Self-starting mode locking can be achieved when the pump power exceeds 700mW due to the high modulation depth of the SA. The

    • Controlled synthesis of Cu nanoparticle arrays with surface enhanced ...

      In this research, polystyrene spheres (PS) were used as a template, and the outer shell of Cu was obtained based on the PS monolayer colloidal crystal template via the ion-sputtering deposition method (strategy shown in Fig. 1). The SERS activity of these Cu nanoparticles was evaluated using crystal

    • Laser Detection of Nanoparticles In the Environment - US EPA

      Laser Detection of Nanoparticles In the Environment APM 31 Tammy Jones-Lepp, Research Chemist1 Kim Rogers, Research Chemist2 Richard Snell, Chemist IV3 1U.S. Environmental Protection Agency National Exposure Research Laboratory Environmental Sciences Division Environmental Chemistry Branch Las Vegas, NV 89119 2U.S. Environmental Protection Agency

    • [PDF File]Nova Biotechnologica et Chimica - ResearchGate

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      The laser parameters leading to ~10 J/pulse energy GW peak power resulted in predominantly spherical particles with the sizes varying from

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