Nickel Monoxide Research Articles

HREM observation of NiO growth on submicron spheres of pure nickel

Spherical submicron particles of materials produced by electrohydrodynamic (EHD) atomization have been used to study a variety of materials processes including nucleation of alternative crystallization phases in iron-nickel and nickel-chromium alloys, amorphous solidification in submicron droplets of pure metals, and quasi-crystal formation in nickel-chromium alloys. Some experiments on pure nickel, nickel oxide single crystals, the nickel/nickel(II) oxide interface, and grain boundaries in nickel monoxide have been performed by STEM. For these latter studies, HREM is the most direct approach to obtain particle crystal structures at the atomic level. Grain boundaries in nickel oxide have also been investigated by HREM. In this paper, we present preliminary results of HREM observations of NiO growth on submicron spheres of pure nickel.Small particles of pure nickel were prepared by EHD atomization. For the study of pure nickel, 0.5 mm diameter pure nickel wire (99.9975%) is sprayed directly in the EHD process. The liquid droplets solidify in free-flight through a vacuum chamber operated at about 10-7 torr.

Thermodynamic characterization of the adsorption of nitric oxide at the {100} face of nickel monoxide microcrystals

Thermodynamic characterization of the adsorption of nitric oxide at the {100} face of nickel monoxide microcrystals

Nickel monoxide-oxygen interaction between 20 and 1000 °c and its impact on the nickel monoxide reduction mechanism

The oxygen adsorption isobar and work function data for nickel monoxide are considered from the point of view of predominant surface oxygen species. The mechanism of oxygen interaction with the NiO surface in the range 20–1000° C is discussed, involving chemisorption equilibria and subsequent changes in oxide non-stoichiometry as a result of oxygen incorporation. It is concluded that five temperature ranges may be distinguished which correspond to different mechanisms of the NiO-oxygen interaction. The effect of NiO surface pre-treatment in oxygen on the mechanism of nickel nucleation is considered. Hypotheses are put forward to explain the specific changes in the number of metallic nuclei and in their volume according to whether oxygen pre-treatment of reduction is performed below or above the Neel temperature of NiO.

Effect of the surface charge on the defect transport kinetics through interfaces of ionic solids

Solutions of the Poisson equation were derived for ionic solids in the case when a localized surface charge or a near-surface charge, produced as a result of segregation, is present. Explicit analytical expressions for the electrical potential distributions are obtained and the values of the kinetic rate constant characterizing the quasi-stationary transport of defects through the surface layer against the electrical barrier are defined. Chromium-doped nickel monoxide was taken as an example as the segregation and chemisorption model is relatively well known. The effect of the surface electrical barrier and resulting limitations for gas-solid kinetics are discussed.

IR and UV-vis-NIR spectra of oxygen adsorbed at low temperature on nickel monoxide

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIR and UV-vis-NIR spectra of oxygen adsorbed at low temperature on nickel monoxideE. Escalona Platero, G. Spoto, S. Coluccia, and A. ZecchinaCite this: Langmuir 1987, 3, 2, 291–297Publication Date (Print):March 1, 1987Publication History Published online1 May 2002Published inissue 1 March 1987https://doi.org/10.1021/la00074a025RIGHTS & PERMISSIONSArticle Views594Altmetric-Citations17LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (836 KB) Get e-Alerts Get e-Alerts

Influence of the temperature on the heat of formation of nickel monoxide at high temperature

In order to see whether the heat of formation Δ H 0 of the insulating transition metal monoxides shows any change at high temperatures, this property has been accurately measured for NiO by the electrochemical method in the temperature range 743–1323 K. The results show that Δ H 0 changes from − 56.10 kcal mol −1 to − 55.66 ± 0.08 kcal mol −1 as the temperature is increased through 913 K. The significance of the heat of formation is discussed from the viewpoint of electronic structure of this compound.

Formation of nickel subcarbonyls from nickel and carbon monoxide

Formation of nickel subcarbonyls from nickel and carbon monoxide

ChemInform Abstract: THE SOLUBILITIES OF NICKEL MONOXIDE, COBALT OXIDE (CO3O4), AND TERNARY OXIDES IN FUSED SODIUM SULFATE AT 1200°K

Chemischer InformationsdienstVolume 12, Issue 4 Physical Inorganic Chemistry ChemInform Abstract: THE SOLUBILITIES OF NICKEL MONOXIDE, COBALT OXIDE (CO3O4), AND TERNARY OXIDES IN FUSED SODIUM SULFATE AT 1200°K D. K. GUPTA, D. K. GUPTASearch for more papers by this authorR. A. RAPP, R. A. RAPPSearch for more papers by this author D. K. GUPTA, D. K. GUPTASearch for more papers by this authorR. A. RAPP, R. A. RAPPSearch for more papers by this author First published: January 27, 1981 https://doi.org/10.1002/chin.198104012AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume12, Issue4January 27, 1981 RelatedInformation

Oxidative and thermal decomposition of bis(acrolein)nickel complexes.

Bis(acrolein)nickel complexes with and without organic nitrogen or phosphorus ligand were subjected to oxidative and thermal decompositions. The complexes were easily oxidized in the order of bipyridyl>triphenylphosphine>ethylenediamine in terms of the ligand in addition to acrolein, and were decomposed quantitatively to acetylene and carbon monoxide. On the other hand, the thermal decomposition of the complexes, except for bis(acrolein)nickel, gave ethylene and carbon monoxide. A possible mechanism for the oxidative decomposition is proposed from the kinetic consideration of the reaction.

Studies of supported nickel catalysts by x-ray photoelectron and ion scattering spectroscopies

Studies of supported nickel catalysts by X-ray photoelectron and ion scattering spectroscopies provided evidence that nickel does not interact with a silica support but forms nickel monoxide; that on ..gamma..-alumina, low nickel contents form two nickel species which interact with the support, of which one is in tetrahedral alumina sites and difficult to reduce and the other, in octahedral sites and easy to reduce; that at higher calcination temperatures, nickel in octahadral sites diffuses to tetrahadral sites; and that higher nickel loadings on ..gamma..-alumina, nickel monoxide forms on top of the interacting nickel species. The studies were performed with 2-33.2Vertical Bar3< nickel on ..gamma..-alumina and 4-35Vertical Bar3< nickel on silica, prepared by impregnation with nickel nitrate and calcined at 400/sup 0/-600/sup 0/C.

Oxidation von Nickelschichten untersucht mittels Elektronenbeugung / Oxydation of Thin Ni-foils Investigated by Electron Diffraction

Abstract Recrystallized nickel foils were treated by oxygen (2·10-4 Torr up to 10-3 Torr) at temperatures up to 550 °C within an electron diffraction set. The treatment was done isothermal and isobaric during few minutes up to several hours. The change in structure was observed. Additional reflexions occured and could be interpreted as due to double reflexion. Under the conditions mentioned above nickel changed into nickel monoxide directly, i. e. without formation of sub-oxides or other intermediate phases. This is in accordance with the fact that up to now no sub-oxides to the transition metals of group VIII a have been found.

Distribution of Inhaled Metal Oxide Particles in Pulmonary Alveoli

The phagocytic response of alveolar cells is a significant factor in determining the pulmonary distribution and fate of inhaled, insoluble particles. The type I alveolar epithelium and alveolar macrophage readily phagocytized inhaled nickel monoxide and chromic oxide particles with 80% and 91%, respectively, of alveolar deposits being found in macrophages and 0.5% and 4.2%, respectively, being localized in type I alveolar epithelium. Type II alveolar epithelium did not exhibit any phagocytic activity. Fewer NiO particles were found in macrophages, and more were found free in alveolar lumens following exposure to cigarette smoke, indicating an inhibition of phagocytosis of inhaled particles by cigarette smoke.

Diffuse reflectance spectrum of nickel monoxide

Diffuse reflectance spectra of pure and diluted samples of nickel monoxide powder have been studied in the region 200–1000 nm. Three bands have been observed. The bands near 710, 450, and 227 nm have been assigned to 3A 2g → 3T 1g( 3F), 3A 2g → 3T 1g( 3P) , and electron transfer transitions, respectively.

Role of Doped Lithium in Nickel Monoxide in the Formation of Higher Valency Nickel Oxides by Anodic Oxidation

Abstract The anodic oxidation and cathodic reduction behavior of a sintered body of lithiated nickel oxide were studied. The electrode with the higher Li content was more active than that with the lower Li content with regard to the electrochemical oxidation and reduction in the potential range between oxygen and hydrogen evolution. The quantity of the higher-valency nickel oxide having an apparent valence state of nickel ions from +8/3 to +4 formed by the anodic oxidation was estimated by measuring the quantity of electricity required for reducing it to −0.14V vs. SCE. This quantity is proportional to the Li content for electrodes containing more than 0.04 atom% of Li.

Study of the chemisorption of mixtures of acetone with oxygen on nickel monoxide by the method of infrared spectroscopy

1. It may be concluded on the basis of the IR spectra obtained that the adsorption of mixtures of acetone with oxygen is accompanied by a number of chemical conversions on the surface of NiO, which leads to “hyperadditivity” in the case of adsorption. 2. The nature of the surface compounds formed during adsorption depends upon the order of admission of the components of the mixture. 3. The adsorption of a mixture of acetone and oxygen is characterized by the formation of enolate and molecular complexes of acetone, coordination-bonded water, and a surface carboxyl ion. 4. The process of formation of surface complexes at room temperature is of a “dead end” nature. 5. The greatest intensity of chemical conversions on the surface of NiO in the case of simultaneous adsorption of acetone and oxygen may be explained by the “presorption effect.”

The Sulphation of Tricobalt Tetroxide and Nickel Monoxide with Fused Sodium Hydrogen Sulphate

The Sulphation of Tricobalt Tetroxide and Nickel Monoxide with Fused Sodium Hydrogen Sulphate

The Sulphation of Tricobalt Tetroxide and Nickel Monoxide with Fused Sodium Hydrogen Sulphate

The results of differential thermal, X-ray powder diffraction analyses and thermogravimetric analyses have heen used to identify the reactions that occur when NaHSO4 is heated between 150°C and 400°C with NiO and with Co3O4. The initial reactions occur on fusion of NaHSO4 and produce monohydrated sulphates Ni and Co, Na2SO4 and Na3H(SO4)2. The Na3H(SO4)2 decomposes to Na2SO4 and Na2S2SO7 at higher temperature NiSO4·H2O reacts with Na2SO4, forming NiSO4·Na2SO4, H2O, which subsequently dehydrates; but CoSO4·H2O dehydrates before reaction occurs to produce-CoSO4·Na2SO4.

Transient Ionic Species Resulting from Gas—Solid Interactions: Oxygen Adsorption on Nickel Monoxide1a

Transient Ionic Species Resulting from Gas—Solid Interactions: Oxygen Adsorption on Nickel Monoxide^1a

Stereospecific polymerization of isobutyl vinyl ether at elevated temperatures

AbstractIsotactic polyvinyl isobutyl ether was obtained using chromium trioxide as catalyst at elevated temperatures, even at 80°C. Polymerization was carried out in a heterogeneous system. A stirring device to mill the catalyst is necessary to obtain polymer which has a high crystalline fraction. The crystalline fraction, whose melting point is over 140°C., was separated by extracting the amorphous portion with methyl ethyl ketone, and was between 20 and 30% weight of the total polymer. In this connection, other transition metal oxides were examined but chromium oxides of lower valence than 6 had little activity toward polymerization. Moreover, molybdenum trioxide, vanadium pentoxide, and nickel monoxide showed activity toward polymerization, but the polymers obtained with these catalysts had no crystalline fraction.

ADSORPTION AND DECOMPOSITION OF NICKEL CARBONYL ON THE SURFACE OF RESPIRATOR CHARCOALS

Nickel carbonyl is adsorbed by respirator charcoals without decomposition in the absence of oxygen. The amount adsorbed is reduced if the charcoal has previously adsorbed nickel carbonyl, carbon tetrachloride, phosgene, or arsine and has not been degassed thereafter. The adsorbed nickel carbonyl is oxidized rapidly by oxygen, liberating carbon dioxide, carbon monoxide, and leaving an amorphous deposit on the charcoal. This deposit is slightly more than half nickel, and does not yield an X-ray diffraction pattern. Adsorbed nickel carbonyl is decomposed thermally to give metallic nickel and carbon monoxide. The nickel is deposited in sufficient amounts to give an X-ray diffraction pattern.