Particle size distributions and compositions of aerosols produced by near-IR femto- and nanosecond laser ablation of brass

2004 ◽  
Vol 19 (2) ◽  
pp. 267-272 ◽  
Author(s):  
J. Koch ◽  
A. von Bohlen ◽  
R. Hergenröder ◽  
K. Niemax
Keyword(s):  
Particle Size ◽  
Laser Ablation ◽  
Nanosecond Laser ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Nanosecond Laser Ablation ◽  
Near Ir

scholarly journals Stabilized Production of Lipid Nanoparticles of Tunable Size in Taylor Flow Glass Devices with High-Surface-Quality 3D Microchannels

Micromachines ◽  
2019 ◽  
Vol 10 (4) ◽  
pp. 220 ◽  
Author(s):  
Peer Erfle ◽  
Juliane Riewe ◽  
Heike Bunjes ◽  
Andreas Dietzel
Keyword(s):  
Particle Size ◽  
Laser Ablation ◽  
Lipid Nanoparticles ◽  
Volume Flow ◽  
Liquid Volume ◽  
Stable Operation ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Taylor Flow ◽  
Smooth Channel

Nanoparticles as an application platform for active ingredients offer the advantage of efficient absorption and rapid dissolution in the organism, even in cases of poor water solubility. Active substances can either be presented directly as nanoparticles or can be integrated in a colloidal carrier system (e.g., lipid nanoparticles). For bottom-up nanoparticle production minimizing particle contamination, precipitation processes provide an adequate approach. Microfluidic systems ensure a precise control of mixing for the precipitation, which enables a tunable particle size definition. In this work, a gas/liquid Taylor flow micromixer made of chemically inert glass is presented, in which the organic phases are injected through a symmetric inlet structure. The 3D structuring of the glass was performed by femtosecond laser ablation. Rough microchannel walls are typically obtained by laser ablation but were smoothed by a subsequent annealing process resulting in lower hydrophilicity and even rounder channel cross-sections. Only with such smooth channel walls can a substantial reduction of fouling be obtained, allowing for stable operation over longer periods. The ultrafast mixing of the solutions could be adjusted by simply changing the gas volume flow rate. Narrow particle size distributions are obtained for smaller gas bubbles with a low backflow and when the rate of liquid volume flow has a small influence on particle precipitation. Therefore, nanoparticles with adjustable sizes of down to 70 nm could be reliably produced in continuous mode. Particle size distributions could be narrowed to a polydispersity value of 0.12.

scholarly journals Laser-Based Formation of Copper Nanoparticles in Aqueous Solution: Optical Properties, Particle Size Distributions, and Formation Kinetics

2017 ◽  
Vol 70 (11) ◽  
pp. 1212 ◽  
Author(s):  
Ashley J. Mulder ◽  
Rhys D. Tilbury ◽  
Phillip J. Wright ◽  
Thomas Becker ◽  
Massimiliano Massi ◽  
...  
Keyword(s):  
Particle Size ◽  
Laser Ablation ◽  
Absorption Spectra ◽  
Copper Nanoparticles ◽  
Pure Water ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Visible Absorption ◽  
Formation Kinetics ◽  
Direct Laser

We explore the formation kinetics, optical absorption spectra, and particle size distributions of copper nanoparticles (CuNPs) formed by direct laser ablation from the bulk metal via a process we refer to as Laser Ablation Synthesis in Solution (LASiS). Comparisons are made between CuNPs formed in pure water versus those formed in the presence of 1 × 10−4 M solutions of the N-donor ligands 4,4′-bipyridine (4,4′Bipy) and 1H-5-(4-pyridyl)tetrazole (T-4Py). CuNPs formed in pure water and in the presence of 4,4′Bipy display similar UV-visible absorption spectra and very similar particle size distributions. In comparison, CuNPs formed in the presence of T-4Py display significantly different absorption properties, with the surface plasmon resonance transition blue-shifted by ∼55 nm, and a much smaller and narrower particle size distribution compared with the former samples. Based on previous literature reports, it is possible to ascribe these differences to differences in the CuNP surface oxidation states for samples prepared in the presence of T-4Py. However, an analysis of the formation kinetics of all three samples indicates near-identical behaviour.

254. A Comparison of the Particle Size Distributions for Aerosols Generated During Wet Grinding and Dry Deburring of Beryllium

1999 ◽  
Author(s):  
K.K. Ellis ◽  
R. Buchan ◽  
M. Hoover ◽  
J. Martyny ◽  
B. Bucher-Bartleson ◽  
...  
Keyword(s):  
Particle Size ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Wet Grinding

Measurements of Mineral Particle Size Distributions by a Buoyancy Weighing Method

2010 ◽  
Vol 126 (10/11) ◽  
pp. 577-582 ◽  
Author(s):  
Katsuhiko FURUKAWA ◽  
Yuichi OHIRA ◽  
Eiji OBATA ◽  
Yutaka YOSHIDA
Keyword(s):  
Particle Size ◽  
Mineral Particle ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Weighing Method
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