scholarly journals Electronic excitations induced by the impact of coinage metal ions and clusters on a rare gas matrix: Neutralization and luminescence

2007 ◽  
Vol 76 (10) ◽  
Author(s):  
Wolfgang Harbich ◽  
Christoph Sieber ◽  
Karl-Heinz Meiwes-Broer ◽  
Christian Félix
Keyword(s):  
Metal Ions ◽  
Rare Gas ◽  
Electronic Excitations ◽  
Coinage Metal ◽  
The Impact

The impact of metal ions doping on the defect chemistry of methylammonium lead iodide

2018 ◽  
Author(s):  
Nga Phung ◽  
Antonio Abate ◽  
Daniele Meggiolaro ◽  
Filippo De Angelis ◽  
Roberto Felix Duarte ◽  
...  
Keyword(s):  
Metal Ions ◽  
Defect Chemistry ◽  
Lead Iodide ◽  
Methylammonium Lead Iodide ◽  
The Impact

A model study on the impact of metal ions on pre-vulcanization of concentrated natural rubber latex and dipped-products

2021 ◽  
pp. 147776062110629
Author(s):  
Porntip Rojruthai ◽  
Narueporn Payungwong ◽  
Jitladda T Sakdapipanich
Keyword(s):  
Natural Rubber ◽  
Metal Ions ◽  
Colloidal Stability ◽  
Mechanical Stability ◽  
Testing Machine ◽  
Natural Rubber Latex ◽  
Tensile Testing Machine ◽  
Model Study ◽  
Stability Time ◽  
The Impact

A model study on the influence of some heavy metal ions on the stability and vulcanization efficiency of uncompounded and compounded high-ammonia natural rubber (HANR) latex was carried out by an exogenous addition and then determined by Brookfield viscometer, mechanical stability time (MST) tester, and tensile testing machine. The case of pre-vulcanized HANR latex with different aging times was determined by the change in the volatile fatty acid (VFA) number, MST, and viscosity. The compounded HANR latex was coagulated by adding Mn2+and Mg2+ while it was unaltered by adding Zn2+, Fe2+, and Cu2+ ions, leading to their colloidal stability. Therefore, these metal ions were chosen further to study the pre-vulcanization of compounded HANR latex. The presence of Zn2+, Fe2+, and Cu2+ in the latex is responsible for the delay in the vulcanization process and changes the appearance of compounded latex. Before compounding, the addition of such metal ions led to the reduction in tensile strength of the obtained gloves. At the same time, there was no effect on the tensile properties of the gloves made from the compounded HANR latex containing the metal ions.

The impact of metal ions on photoinduced electron-transfer properties: four photochromic metal–organic frameworks based on a naphthalenediimide chromophore

CrystEngComm ◽  
2018 ◽  
Vol 20 (17) ◽  
pp. 2430-2439 ◽  
Author(s):  
Hui-Ling Xu ◽  
Xiao-Shan Zeng ◽  
Jie Li ◽  
Yu-Ci Xu ◽  
Hai-Jiang Qiu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Metal Ions ◽  
Significant Role ◽  
Photoinduced Electron Transfer ◽  
Metal Organic Frameworks ◽  
Metal Organic ◽  
Electron Transfer Properties ◽  
The Impact ◽  
Transfer Properties

Four photochromic MOFs show that electron-withdrawing capabilities of metal ions play a significant role in tuning the photosensitivity of photochromic MOFs.

Depth of Origin of Secondary Ions: Suppression and Enhancement of Ions Upon Passage Through Overlayers.

1994 ◽  
Vol 354 ◽  
Author(s):  
N. J. Sack ◽  
M. Akbulut ◽  
T. E. Madey
Keyword(s):  
Solid Surfaces ◽  
Rare Gas ◽  
Rare Gases ◽  
Secondary Ions ◽  
Vacuum Interface ◽  
Rare Gas Atoms ◽  
Electron Stimulated Desorption ◽  
Energy And Angular Distributions ◽  
The Impact ◽  
Low Energy Ions

AbstractWe are investigating the transmission of low energy ions (<10 eV) through ultrathin films of condensed rare gases. Our goal is to address the issue of the depth of origin of secondary ions that desorb from solid surfaces under the impact of ionizing radiation, such as electrons, photons, or through ion sputtering. The secondary ions are produced by electron stimulated desorption (ESD) from a suitable substrate, such as an oxide or an adsórbate on a metal single crystal; the overlayer gas is condensed onto this substrate. The yield, energy and angular distributions of the ions are measured as a function of overlayer thickness. We find that 7 eV oxygen ions can be transmitted through rare gas films (Kr, Xe) several ML thick. In contrast, O+ is completely suppressed by 0.5 ML of H2O. Surprisingly, we find the F− yield to be 4 times higher in the presence of 1 ML of Xe, compared to the clean surface value, accompanied by a dramatic change in the ions’ angular distribution. We discuss a model which considers elastic scattering and charge transfer of the ions with rare gas atoms, as well as the structure of the surface and the electronic properties of the solid-vacuum interface.

scholarly journals DYNAMICS OF METAL CLUSTERS IN RARE GAS CLUSTERS

2007 ◽  
Vol 21 (13n14) ◽  
pp. 2439-2448
Author(s):  
M. BAER ◽  
G. BOUSQUET ◽  
P. M. DINH ◽  
F. FEHRER ◽  
P.-G. REINHARD ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Metal Clusters ◽  
Intense Laser ◽  
Rare Gas ◽  
Pump Probe ◽  
Realistic Case ◽  
The Matrix ◽  
Pauli Repulsion ◽  
Gas Clusters ◽  
The Impact

We investigate the dynamics of Na clusters embedded in Ar matrices. We use a hierarchical approach, accounting microscopically for the cluster's degrees of freedom and more coarsely for the matrix. The dynamical polarizability of the Ar atoms and the strong Pauli-repulsion exerted by the Ar -electrons are taken into account. We discuss the impact of the matrix on the cluster gross properties and on its optical response. We then consider a realistic case of irradiation by a moderately intense laser and discuss the impact of the matrix on the hindrance of the explosion, as well as a possible pump probe scenario for analyzing dynamical responses.

scholarly journals Effect of Transitional Metals (Mn and Ni) Substitution in LiCoPO4 Olivines

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 601
Author(s):  
Oriele Palumbo ◽  
Jessica Manzi ◽  
Daniele Meggiolaro ◽  
Francesco M. Vitucci ◽  
Francesco Trequattrini ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Structural Changes ◽  
Transition Metal Ions ◽  
Xrd Analysis ◽  
Partial Substitution ◽  
Structural Alterations ◽  
X Ray ◽  
Transitional Metals ◽  
The Impact

Transition metal substitution is a key strategy to optimize the functional properties of advanced crystalline materials used as positive electrodes in secondary lithium batteries (LIBs). Here we investigate the structural alterations in the olivine lattice of Mn and Ni substituted LiCoPO4 phase and the impact on performance in LIBs. X-ray diffraction (XRD) and extended X-ray absorption experiments have been carried out in order to highlight the structural alterations induced by partial substitution of cobalt by manganese and nickel. XRD analysis suggests that substitution induces an expansion of the lattices and an increase of the antisite disorder between lithium and transition metal ions in the structure. XAS data highlight negligible electronic disorder but a relevant modulation in the local coordination around the different metal ions. Moreover, galvanostatic tests showed poor reversibility of the redox reaction compared to the pure LCP sample, and this failure is discussed in detail in view of the observed remarkable structural changes.

The Effects on Angiogenesis of Relevant Inorganic Chemotherapeutics

2020 ◽  
Vol 20 ◽  
Author(s):  
Tiziano Marzo ◽  
Diego La Mendola
Keyword(s):  
Metal Ions ◽  
Anticancer Agents ◽  
Review Article ◽  
Pharmacological Effects ◽  
Complex Interactions ◽  
Pathological Conditions ◽  
Copper Zinc ◽  
Antiangiogenic Factors ◽  
The Impact

: Angiogenesis is a key process allowing the formation of blood vessels. It is crucial for all the tissue and organs, ensuring their function and growth. Angiogenesis is finely controlled by several mechanisms involving complex interactions between pro- or antiangiogenic factors and an imbalance in this control chain may result in pathological conditions. Metals as copper, zinc and iron cover an essential role in regulating angiogenesis, thus therapies having physiological metals as target have been proposed. Also, some complexes of heavier metal ions (e.g Pt, Au, Ru) are currently used as established or experimental anticancer agents targeting genomic or non-genomic targets. These molecules may affect the angiogenic mechanisms determining different effects that have been only poorly and non-systematically investigated so far. Accordingly, in this review article we aim to recapitulate the impact on the angiogenic process of some reference anticancer drugs, and how it is connected to the overall pharmacological effects. Also, we highlight how the activity of these drugs can be related to the role of biological essential metal ions. Overall, this may allow a deeper description and understanding of the antineoplastic activity of both approved or experimental metal complexes, providing important insights for the synthesis of new inorganic drugs able to overcome resistance and recurrence phenomena.

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