Search results for "NICKEL"

A Photoelectrochemical Study of Passivating Layers on Nickel

1995

Simultaneous Anodic Dissolution and Passivation of Nickel in Moderate Acid Medium

2006

The EQCM results show that nickel electrodissolution and nickel passivation occur simultaneously in a sulphate acid media of pH = 3.5. Mass balances have been done from the instantaneous F(dm/dQ) function. The fitting of the experimental i = f(E) and -dm/dt = g(E) curves to the theoretical equations allow to obtain information about the kinetic parameters and the molecular mass of the species involved in the electrochemical processes.

Crystal Data for Nickel Cimetidine Chloride: Ni (CM)2 CL2·2H2O

1989

AbstractNickel Cimetidine Chloride, Ni(C10H16SN6)2Cl2·2H2O has been investigated by means of X-ray powder diffraction. Unit cell dimensions were determined by indexing programs, from diffractometer data obtained with copper radiation. A primitive monoclinic cell was found: a = 11.836(3)Å, b = 13.322(5)Å, c = 10.487(2)Å, β = 113.08 (2)°, Z = 2, Dx = 1.462 g/cm3, M.W. = 670.32. These data are consistent with values reported in the literature for other cimetidine complexes.

ChemInform Abstract: Merging Visible-Light-Photoredox and Nickel Catalysis

2015

Review: [scope and limitations of the combination of nickel and photoredox catalysis for Csp3—Csp2 cross-coupling reactions; 18 refs.

Single-electron tunneling in metal droplets in the high conductance regime

2001

We present single-electron tunneling results for well-characterized multidroplet systems in the high conductance regime. The work was conducted with tunnel systems comprising ultra-small Ni droplets. The conductance associated with individual droplets was estimated to reach 18--19G{sub K} in systems exhibiting especially high conductance. The P(E) (phase correlation) theory has been successfully applied to the conductance characteristics of these systems. Our results suggest that in the high conductance regime the droplets can be modeled as single, resistively isolated tunnel junctions. Based on an analysis of the single-electron properties of these systems, the average number of droplets N…

X-ray absorption spectroscopy studies of the off-center Ni2+ions in Ni c Mg 1-c O solid solutions

1996

In this work we present the x-ray absorption spectroscopy study of NicMg1-cO (0.01 <EQ c <EQ 1) solid solutions. The extended x-ray absorption fine structure (EXAFS) above the Ni K-edge was analyzed using the multi-shell fitting procedure. It was found that nickel ions are located in a distorted environment and shift upon dilution to the off- center positions. This fact follows from two main results: (1) in the first shell, the average Ni- O distance increases linearly upon dilution; (2) in the second shell, the average Ni-Ni distance remains unchanged and decreases slightly at low nickel concentration while the dependence of the Ni-Mg distance has a break at c approximately equals 0.6 and …

A novel approach for obtaining α,β-diaminophosphonates bearing structurally diverse side chains and their interactions with transition metal ions stu…

2020

Aminophosphonates are an important group of building blocks in medicinal and pharmaceutical chemistry. Novel representatives of this class of compounds containing nontypical side chains are still needed. The aza-Michael-type addition of amines to phosphonodehydroalanine derivatives provides a simple and effective approach for synthesizing N′-substituted α,β-diaminoethylphosphonates and thus affords general access to aminophosphonates bearing structurally diverse side chains. Thermodynamic analysis of the chosen aminophosphonates at physiological pH proves that they serve as potent chelators for copper(II) ions and moderate chelators for nickel(II) ions.

ChemInform Abstract: Synthesis and Characterization of NdNiO3 Prepared by Low Temperature Methods.

2010

Abstract NdNiO3 has been prepared with an orthorhombic perovskite structure by a low temperature and low oxygen pressure method starting from a nickel(III) oxide precursor, β-NiO(OH). The compound LaNiO3 has also been obtained by this method. This chemical-precursor-based synthesis overcomes problems related to the use of high oxygen pressures in the synthesis.

Preparation of hepatitis C virus structural and non-structural protein fragments and studies of their immunogenicity

2006

Abstract Plasmids pQE-60 and pQE-30 containing 6× His-tag sequence were used for expression of fragments of HCV structural and non-structural proteins in Escherichia coli (E. coli). The following fragments were used: core (1–98 aa), NS3 (202–482 aa), and tetramer of hypervariable region 1 (HVR1) of E2 protein. The constructed plasmids directed high levels of expression of HCV proteins in E. coli JM109. After purification by the metal-affinity chromatography on nickel–nitrilotriacetic acid (Ni–NTA) agarose, the His-tagged HCV proteins were used for immunization of BALB/c mice. All three proteins were able to induce high levels of specific antibodies and, in the case of the NS3 and HVR1 tetra…

Silicatein conjugation inside nanoconfined geometries through immobilized NTA–Ni(ii) chelates

2013

The chemical modification and bioconjugation processes inside confined geometries by His-tagged silicatein promote sensitive changes in the polarity and surface charge density that mainly contribute to the ionic current rectification properties of the single conical nanopores.