Chemical Reactivity of Metal Particles Produced by Laser Ablation into Liquids

1990 ◽  
Vol 191 ◽  
Author(s):  
W. L. Parker ◽  
Philip Boudjouk
Keyword(s):  
Laser Ablation ◽  
Oxidation State ◽  
Chemical Reactivity ◽  
Chemical Reduction ◽  
Metal Particles ◽  
Spectroscopic Evidence ◽  
Reactive Fluid

ABSTRACTSpectroscopic evidence of the chemical differences between metal particles produced by laser ablation of metals into reactive fluid solvents and metal particles produced by less energetic means is presented. Specifically. 1) ablation of copper into fluid methanol produces metal particles in which some fraction of the metal is present In the cuprous oxidation state and 2) ablation of nickel into tetrahydrofuran results In metal particles less reactive to the solvent than those produced by ultrasound promoted chemical reduction.

scholarly journals Oxidation-State Control of Nanoparticles Synthesized via Chemical Reduction Using Potential Diagrams

2009 ◽  
Vol 156 (8) ◽  
pp. D321 ◽  
Author(s):  
Shunsuke Yagi ◽  
Hidetaka Nakanishi ◽  
Tetsu Ichitsubo ◽  
Eiichiro Matsubara
Keyword(s):  
Oxidation State ◽  
Chemical Reduction ◽  
State Control

Chemical reactivity on the surface of polymer films after excimer laser ablation

1994 ◽  
pp. 291-294
Author(s):  
H. Niino ◽  
T. Imura ◽  
T. Ohana ◽  
C. Nagai ◽  
H. Itoh ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Excimer Laser ◽  
Polymer Films ◽  
Chemical Reactivity ◽  
Excimer Laser Ablation

Particle size distributions of aerosols formed by laser ablation of solids at 760 Torr

1994 ◽  
Vol 9 (11) ◽  
pp. 2868-2872 ◽  
Author(s):  
Robert R. Whitlock ◽  
Glendon M. Frick
Keyword(s):  
Laser Ablation ◽  
Atmospheric Pressure ◽  
Energy Deposition ◽  
Metal Particles ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Differential Mobility ◽  
Excimer Laser Ablation ◽  
Scattering Technique ◽  
Light Scattering Technique

The size distributions of aerosol particles generated in N2 and O2 at ambient atmospheric pressure by repetitive excimer laser ablation of solids have been measured in quasi-steady-state from 10 nm to 1 μm diameter with a differential mobility analyzer (DMA). A light scattering technique extended the range of measurable sizes up to 20 μm, beyond the upper limit of sizes observed in the aerosol. Irradiation near focus was required to observe metal particles above 0.1 μm diameter. YBCO ceramic (YBa2Cu3O7) produced copious smaller particles with mild focusing. For an ablated polymer, PMMA, particulate production increased and the size distribution altered shape with continued energy deposition.

Spectroscopic evidence of a core–shell structure in the earlier formation stages of Au–Ag nanoparticles by pulsed laser ablation in water

2008 ◽  
Vol 457 (4-6) ◽  
pp. 386-390 ◽  
Author(s):  
Giuseppe Compagnini ◽  
Elena Messina ◽  
Orazio Puglisi ◽  
Rosario Sergio Cataliotti ◽  
Valeria Nicolosi
Keyword(s):  
Laser Ablation ◽  
Shell Structure ◽  
Ag Nanoparticles ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Core Shell ◽  
Spectroscopic Evidence ◽  
Core Shell Structure

Influence of oxidation state on water solubility of Si nanoparticles prepared by laser ablation in water

2017 ◽  
Author(s):  
Yu. V. Ryabchikov ◽  
A. Al-Kattan ◽  
V. Chirvony ◽  
J. F. Sanchez-Royo ◽  
M. Sentis ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Oxidation State ◽  
Water Solubility ◽  
Si Nanoparticles

scholarly journals Metrical Oxidation States of 1,4-Diazadiene (DAD) Derived Ligands

2020 ◽  
Author(s):  
F.J. de Zwart ◽  
Bente Reus ◽  
Annechien A.H. Laporte ◽  
Vivek Sinha ◽  
Bas de Bruin
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Oxidation State ◽  
Transition Metal Complexes ◽  
Coordination Mode ◽  
Chemical Reactivity ◽  
Accurate Determination ◽  
Oxidation States ◽  
Wide Range ◽  
Ligand Bond

The conventional method of assigning formal oxidation states (FOS) to metals and ligands is an important tool for understanding and predicting chemical reactivity, in particular in catalysis research. For complexes containing redox-noninnocent ligands, the oxidation state of the ligand can be ambiguous (i.e. their spectroscopic oxidation state can differ from the formal oxidation state), and thus frustrates the assignment of the oxidation state of the metal. A quantitative correlation between empirical metric data of redox active ligands and their oxidation states using a metrical oxidation state (MOS) model has been developed for catecholate and aminophenolate derived ligands by Brown. In the present work, we present a MOS model for 1,4-diazabutadiene (DAD<sup>n</sup>) ligands. The model is based on a similar approach as reported by Brown, correlating the intra-ligand bond lengths of the DAD<sup>n</sup> moiety in a quantitative manner to the MOS using geometrical information from X-ray structures in the Cambridge Crystallographic Data Center (CCDC) database. However, accurate determination of the MOS of these ligands turned-out to be dependent the coordination mode of the DAD<sup>2-</sup> moiety, which can adopt both a planar <i>κ<sup>2</sup></i>-<i>N<sub>2</sub></i>-geometry and a <i>η<sup>4</sup></i>-<i>N<sub>2</sub></i>-<i>C<sub>2</sub></i> π-coordination mode in (transition) metal complexes in its doubly reduced, dianionic enediamide oxidation state. A reliable MOS model was developed taking the intrinsic differences in intra-ligand bond distances between these coordination modes of the DAD<sup>2‒</sup> ligand into account. Three different models were defined and tested using different geometric parameters (C=C→M distance, M-N-C angle, M-N-C-C torsion angle) to describe the C=C backbone coordination to the metal in the <i>η<sup>4</sup></i>-<i>N<sub>2</sub></i>-<i>C<sub>2</sub></i> π-coordination mode of the DAD<sup>2‒</sup> ligand. Statistical analysis revealed that the C=C→M distance best describes the <i>η<sup>4</sup></i>-<i>N<sub>2</sub></i>-<i>C<sub>2</sub></i> coordination mode, using a cut-off value of 2.46 Å for π-coordination. The developed MOS model was used to validate the oxidation state assignment of elements not contained within the training set (Sr, Yb and Ho), thus demonstrating the applicability of the MOS model to a wide range of complexes. Chromium complexes with complex electronic structures were also shown to be accurately described by MOS analysis. Furthermore, it is shown that a combination of MOS analysis and FOD calculations provide an inexpensive method to gain insight into the electronic structure of singlet spin state (S = 0) [M(trop<sub>2</sub>dad)] transition metal complexes showing multireference character.<br>

scholarly journals Assessing the Surface Oxidation State of Free-Standing Gold Nanoparticles Produced by Laser Ablation

Langmuir ◽  
2019 ◽  
Vol 35 (36) ◽  
pp. 11859-11871 ◽  
Author(s):  
Manuel De Anda Villa ◽  
Jérôme Gaudin ◽  
David Amans ◽  
Fahima Boudjada ◽  
John Bozek ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Laser Ablation ◽  
Oxidation State ◽  
Surface Oxidation ◽  
Free Standing
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