Inclusion Compounds of Tetracyano Complexes and Their Electrical Properties

1994 ◽  
Vol 59 (11) ◽  
pp. 2436-2446 ◽  
Author(s):  
Mária Reháková ◽  
Anna Sopková ◽  
Vladimír Šály
Keyword(s):  
Electrical Conductivity ◽  
Chemical Composition ◽  
Electrical Properties ◽  
General Formula ◽  
Inclusion Compounds ◽  
High Frequency ◽  
Iodide Ions ◽  
Structure And Morphology ◽  
Composition Structure ◽  
Tetracyano Complexes

The presence of iodine and iodide ions in tetracyanonickelates inclusion compounds with the general formula Ni(B)mNi(CN)4 . n H2O (B = NH3 or ethylenediamine) changes the properties of these compounds. High frequency conductance measurements in the range of 10 - 105 Hz show that the products with ethylenediamine ligands have a higher electrical conductivity than those with NH3 ligands. The differences in the electrical properties between the compounds studied are mainly caused by chemical composition, structure and morphology.

STUDYING MULTILAYERED GRAPHENES BY ELECTROPHYSICAL METHODS

2021 ◽  
pp. 100-107
Author(s):  
K. L. Levine ◽  
D. V. Ryabokon ◽  
S. D. Khanin ◽  
R. V. Gelamo ◽  
N. A. Nikonorova
Keyword(s):  
Electrical Conductivity ◽  
Chemical Composition ◽  
Electrical Properties ◽  
Work Function ◽  
Electron Work Function ◽  
Charge Storage ◽  
High Electrical Conductivity ◽  
Free Standing ◽  
Storage Devices

The paper studies multilayer graphenes in the form of free-standing films. The authors provide data about the morphology and electrical properties of films treated with plasma of various chemical composition. It is shown that it is possible to control the electrical properties of the surface and electron work function without significantly affecting its morphology. The obtained samples, combining mechanical flexibility with unreactiveness and high electrical conductivity, are promising for application in flexible charge storage devices.

New Sorption Materials on the Basis of Aluminosilicates for Wasterwater Treatment

2017 ◽  
Vol 13 ◽  
pp. 190-196
Author(s):  
Kristina K. Abdugaffarova ◽  
Maksim V. Dorogov ◽  
Anatolii A. Vikarchuk ◽  
Vlada V. Zabolotskikh ◽  
Vladislav S. Firsov
Keyword(s):  
Heavy Metals ◽  
Methylene Blue ◽  
Chemical Composition ◽  
Specific Surface ◽  
Post Treatment ◽  
Pilot Studies ◽  
Physical Methods ◽  
Structure And Morphology ◽  
Composition Structure

This article presents the results of experimental obtaining together with tests of modifications of the granulated sorption aluminosilicate-based material. The chemical composition, structure and morphology of a surface of the obtained modifications of sorbents from clay have been explored. Through a complex of modern physical methods it is established that porosity and a specific surface of clay-based sorbents increased as a result of modification. Pilot studies have shown higher efficiency of new aluminosilicate-based sorbents in comparison with absorbent carbon during sorption of such model pollutants as methylene blue, phenol and ions of heavy metals. Modifications of sorbent which can be effectively used for post treatment of wastewater are revealed.

scholarly journals The Effect of Fe and Mn Substitution on Structural and Electrical Properties of LaCoO3 Nanoparticles

2019 ◽  
Vol 8 (6) ◽  
pp. 3213-3217
Keyword(s):  
Chemical Composition ◽  
Electrical Properties ◽  
Sol Gel ◽  
Impedance Analysis ◽  
Structure And Morphology ◽  
Edax Analysis ◽  
Structural And Electrical Properties ◽  
Fe And Mn ◽  
Mn Substitution ◽  
Mn Doped

Pure and Fe, Mn doped LaCoO3 nanoparticles are primed by sol gel ignition method, and their electrical properties are studied. All the materials were characterized to study the structure and morphology. The chemical composition of the samples was analysed by EDAX analysis revealing that La, Co, O (Mn, Fe) compounds were present. Electrical properties were identified in impedance analysis and the conductivity of the materials was calculated. And it is found that Fe doped LaCoO3 possesses higher conductivity than all others

scholarly journals Decomposition of High-Frequency Electrical Conductivity into Extracellular and Intracellular Compartments based on Two-Compartment Model using Low-to-High Multi-b Diffusion MRI

2020 ◽  
Author(s):  
Mun Bae Lee ◽  
Hyung Joong Kim ◽  
Oh-In Kwon
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
High Frequency ◽  
Compartment Model ◽  
Biological Tissues ◽  
Extracellular Medium ◽  
Two Compartment Model ◽  
Random Decision Forests ◽  
Human Experiments ◽  
Micro Structures

Abstract Background: As an object's electrical passive property, the electrical conductivity is proportional to the mobility and concentration of charged carriers that reflect the brain micro-structures. The measured Mb-DWI data by controlling the degree of applied diffusion weights can quantify the apparent mobility of water molecules within biological tissues. Without any external electrical stimulation, magnetic resonance electrical properties tomography (MREPT) techniques have successfully recovered the conductivity distribution at a Larmor-frequency. Methods: This work provides a non-invasive method to decompose the high-frequency conductivity into the extracellular medium conductivity based on a two-compartment model using multi-b diffusion-weighted imaging (Mb-DWI). To separate the intra- and extracellular micro-structures from the recovered high-frequency conductivity, we include higher b-values DWI and apply the random decision forests to stably determine the micro-structural diffusion parameters. Results: To demonstrate the proposed method, we conducted human experiments by comparing the results of reconstructed conductivity of extracellular medium and the conductivity in the intra-neurite and intra-cell body. Human experiments verify that the proposed method can recover the extracellular electrical properties from the high-frequency conductivity using a routine protocol sequence of MRI scan. Conclusion: We have proposed a method to decompose the electrical properties in the extracellular, intra-neurite, and soma compartments from the high-frequency conductivity map, reconstructed by solving the electro-magnetic equation with measured B1 phase signals.

scholarly journals Decomposition of high-frequency electrical conductivity into extracellular and intracellular compartments based on two-compartment model using low-to-high multi-b diffusion MRI

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Mun Bae Lee ◽  
Hyung Joong Kim ◽  
Oh In Kwon
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
High Frequency ◽  
Compartment Model ◽  
Biological Tissues ◽  
Extracellular Medium ◽  
Two Compartment Model ◽  
Random Decision Forests ◽  
Human Experiments ◽  
Micro Structures

Abstract Background As an object’s electrical passive property, the electrical conductivity is proportional to the mobility and concentration of charged carriers that reflect the brain micro-structures. The measured multi-b diffusion-weighted imaging (Mb-DWI) data by controlling the degree of applied diffusion weights can quantify the apparent mobility of water molecules within biological tissues. Without any external electrical stimulation, magnetic resonance electrical properties tomography (MREPT) techniques have successfully recovered the conductivity distribution at a Larmor-frequency. Methods This work provides a non-invasive method to decompose the high-frequency conductivity into the extracellular medium conductivity based on a two-compartment model using Mb-DWI. To separate the intra- and extracellular micro-structures from the recovered high-frequency conductivity, we include higher b-values DWI and apply the random decision forests to stably determine the micro-structural diffusion parameters. Results To demonstrate the proposed method, we conducted phantom and human experiments by comparing the results of reconstructed conductivity of extracellular medium and the conductivity in the intra-neurite and intra-cell body. The phantom and human experiments verify that the proposed method can recover the extracellular electrical properties from the high-frequency conductivity using a routine protocol sequence of MRI scan. Conclusion We have proposed a method to decompose the electrical properties in the extracellular, intra-neurite, and soma compartments from the high-frequency conductivity map, reconstructed by solving the electro-magnetic equation with measured B1 phase signals.

scholarly journals Reduction of graphene oxide and graphene quantum dots using nascent hydrogen: The investigation of morphological and structural changes

2020 ◽  
Vol 5 (1) ◽  
pp. 1-4
Author(s):  
Svetlana Jovanovic ◽  
Olaf C. Haenssler ◽  
Milica Budimir ◽  
Duška Kleut ◽  
Jovana Prekodravac ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Chemical Composition ◽  
Electrical Properties ◽  
Chemical Modification ◽  
Structural Changes ◽  
Morphological Changes ◽  
Graphene Quantum Dots ◽  
Structure And Morphology

AbstractIn order to modify both chemical and electrical properties of graphene-based nanomaterials, we conducted the chemical modification of graphene oxide (GO) and graphene quantum dots (GQDs). The reaction of the reduction with nascent hydrogen was conducted on both materials. The structure and morphology of produced chemically reduced GO and GQDs were analyzed. While the chemical composition of both GQD and GO changed significantly, GO showed also significant changes in morphology as opposite to GQDs where were morphological changes were not observed.

scholarly journals ELECTROPHYSICAL PROPERTIES OF SOLID SOLUTIONS NANBFEO-(x = 0;0,1;0,2)

2020 ◽  
pp. 16-24
Author(s):  
Екатерина Владимировна Барабанова ◽  
Никита Михайлович Оспельников ◽  
Александра Ивановна Иванова
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
Electrical Properties ◽  
Curie Temperature ◽  
General Formula ◽  
Solid Solutions ◽  
Complex Oxides ◽  
Sodium Niobate ◽  
Electrophysical Properties ◽  
The Family

Введение легирующих примесей является классическим способом модификации свойств сложных оксидов семейства перовскита с общей формулой ABO. В качестве основы для создания твердых растворов широко используется ниобат натрия NaNbO. Введение замещающих катионов проводится как по позиции A, так и по позиции B. При этом особый интерес представляет случай, когда валентность легирующей примеси больше или меньше валентности исходного катиона в узле. В этом случае образуется дефектная структура, которая может обладать уникальными свойствами. Данная работа посвящена исследованию электрофизических свойств керамики ниобата натрия с примесью Fe. Замещение производилось по позициям катионов ниобия Nb . Показано, что для таких составов характерно значительное увеличение электропроводности, понижение температуры Кюри и размытие фазового перехода. Introduction of dopants is a classic method for modifying properties of perovskite complex oxides of the family of general formula ABO. Sodium niobate NaNbO is widely used as a basis for creating solid solutions. The introduction of substitutional cations is carried out at both position A and at position B . Of particular interest is the case when valence of the dopant is greater or less than valence of the initial cation at the site. In this case, a defected structure is formed, which may have unique properties. This work is devoted to study of the electrical properties of sodium niobate ceramics doped with Fe . The substitution was carried out according to positions of the nibium cations Nb . It is shown that such compositions are characterized by a significant increase in electrical conductivity, a decrease in the Curie temperature, and a diffuse of the phase transition.

From Nd(III) and Pu(III) Oxalates to Oxides: Influence of Nitrilotris(methylenephosphonic acid) on Chemical Composition, Structure, and Morphology

2017 ◽  
Vol 17 (9) ◽  
pp. 4715-4725 ◽  
Author(s):  
Anne-Lise Vitart ◽  
Blaise Haidon ◽  
Benedicte Arab-Chapelet ◽  
Murielle Rivenet ◽  
Isabelle Bisel ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Structure And Morphology ◽  
Composition Structure

The potential of fracture imaging using high‐frequency, single‐hole electromagnetic data

Geophysics ◽  
2002 ◽  
Vol 67 (4) ◽  
pp. 1087-1094 ◽  
Author(s):  
Soon Jee Seol ◽  
Jung Hee Suh ◽  
Yoonho Song ◽  
Hee Joon Kim ◽  
Ki Ha Lee
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
High Frequency ◽  
Least Squares Method ◽  
Thin Sheet ◽  
Integral Equation Method ◽  
Displacement Current ◽  
High Electrical Conductivity ◽  
Single Hole ◽  
Electrical Permittivity

This paper presents an inversion scheme for high‐frequency electromagnetic (EM) data from a single borehole for detection and characterization of fluid‐filled fractures. Water in the fracture zone may be characterized by its high electrical permittivity and, if saline, by high electrical conductivity. High electrical conductivity results in increased attenuation of EM fields, whereas high electrical permittivity reduces the phase velocity of propagating EM fields. Taking advantage of these effects, we use high‐frequency EM fields to detect and characterize fluid‐filled fractures. To demonstrate the feasibility of single‐hole EM imaging, we develop a three‐step inversion scheme to map a fluid‐filled fracture near the borehole and to evaluate its electrical conductivity and permittivity. We assume that a fluid‐filled fracture can be simulated by a conductive thin sheet. To test our inversion scheme, we generated synthetic data using the thin‐sheet integral equation method. A vertical magnetic dipole was used as a source, and the resultant magnetic fields were inverted using a nonlinear least‐squares method. First, the background conductivity and permittivity were obtained using vertical magnetic field data from below and above the transition frequency, at which conduction and displacement current magnitudes are equal. Next, using the phase difference between EM fields at two neighboring frequencies in the wave propagation realm, both the vertical and dipping sheets were successfully mapped using NMO and migration techniques. Electrical properties of the sheet were well resolved by subsequent inversion after having fixed the location of the sheet and host electrical properties. This study shows the potential of imaging the fracture using high‐frequency EM data obtained from single‐hole surveys.

scholarly journals Synthesis of polyaniline in presence of low magnetic field, its structure and electrical properties

2008 ◽  
Vol 2 (2) ◽  
pp. 105-109
Author(s):  
Nafdey Renuka ◽  
◽  
Kelkar Deepali ◽  
Keyword(s):  
Magnetic Field ◽  
Electrical Conductivity ◽  
Electrical Properties ◽  
Polymer Chain ◽  
Synthesis Process ◽  
Structure And Morphology ◽  
Low Magnetic Field ◽  
Chain Ordering

Polyaniline is synthesized chemically under the influence of low magnetic field of intensity 1KGauss. The effect of magnetic field during the synthesis process causes enhancement of electrical conductivity by two orders of magnitude. This increased electrical conductivity depends on the polymer chain ordering, as well as structure and morphology of the reported polymer.

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