scholarly journals Experimental Characterization of Dielectric Properties in Fluid Saturated Artificial Shales

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Roman Beloborodov ◽  
Marina Pervukhina ◽  
Tongcheng Han ◽  
Matthew Josh
Keyword(s):  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Dielectric Response ◽  
Pore Space ◽  
Mineralogical Composition ◽  
Data Interpretation ◽  
Dielectric Anisotropy ◽  
Geomechanical Properties ◽  
High Dielectric ◽  
Rock Microstructure

High dielectric contrast between water and hydrocarbons provides a useful method for distinguishing between producible layers of reservoir rocks and surrounding media. Dielectric response at high frequencies is related to the moisture content of rocks. Correlations between the dielectric permittivity and specific surface area can be used for the estimation of elastic and geomechanical properties of rocks. Knowledge of dielectric loss-factor and relaxation frequency in shales is critical for the design of techniques for effective hydrocarbon extraction and production from unconventional reservoirs. Although applicability of dielectric measurements is intriguing, the data interpretation is very challenging due to many factors influencing the dielectric response. For instance, dielectric permittivity is determined by mineralogical composition of solid fraction, volumetric content and composition of saturating fluid, rock microstructure and geometrical features of its solid components and pore space, temperature, and pressure. In this experimental study, we investigate the frequency dependent dielectric properties of artificial shale rocks prepared from silt-clay mixtures via mechanical compaction. Samples are prepared with various clay contents and pore fluids of different salinity and cation compositions. Measurements of dielectric properties are conducted in two orientations to investigate the dielectric anisotropy as the samples acquire strongly oriented microstructures during the compaction process.

A versatile foaming platform to fabricate polymer/carbon composites with high dielectric permittivity and ultra-low dielectric loss

2019 ◽  
Vol 7 (1) ◽  
pp. 133-140 ◽  
Author(s):  
Biao Zhao ◽  
Mahdi Hamidinejad ◽  
Chongxiang Zhao ◽  
Ruosong Li ◽  
Sai Wang ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Dielectric Loss ◽  
Dielectric Permittivity ◽  
Carbon Composite ◽  
Carbon Composites ◽  
Low Dielectric ◽  
Composite Foams ◽  
High Dielectric Permittivity ◽  
High Dielectric

A microcellular structure can effectively tune the dielectric properties of PVDF/carbon composite foams.

High dielectric response of 2D-polyaniline nanoflake based epoxy nanocomposites

RSC Advances ◽  
2015 ◽  
Vol 5 (60) ◽  
pp. 48421-48425 ◽  
Author(s):  
Meher Wan ◽  
Anoop K. Srivastava ◽  
Punit K. Dhawan ◽  
Raja Ram Yadav ◽  
Sudhindra B. Sant ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Epoxy Matrix ◽  
Dielectric Response ◽  
Two Dimensional ◽  
Epoxy Nanocomposites ◽  
High Dielectric

Nanocomposites of two dimensional nanoflake-like polyaniline fillers reinforced in an epoxy matrix have been synthesised and their dielectric properties have been investigated.

Analysis of the Dielectric Anisotropy of Typical Nematics with the Aid of the Maier-Meier Equations

2000 ◽  
Vol 55 (3-4) ◽  
pp. 449-456 ◽  
Author(s):  
Stanisław Urban ◽  
Jerzy Kędzierski ◽  
Roman Dąbrowski
Keyword(s):  
Experimental Data ◽  
Dipole Moment ◽  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Order Parameter ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Molecular Axis ◽  
Dielectric Anisotropy

Abstract Using the experimental data on the dielectric anisotropy, density, polarizability, dipole moment, and order parameter in the nematic phase of seven typical liquid crystalline substances, the applicability of the Maier-Meier theory for the description of the dielectric properties of nematics is checked. Substanc-es with different polarity and different tendency to form associates in the nematic phase were studied. It is found that the Maier-Meier equations describe fairly well the dielectric permittivity components of nematics. The estimated values of the angle β formed by the dipole moment with the long molecular axis are compared with those obtained in other studies

DIELECTRIC PROPERTIES OF Ca2CuO3–CaCu2O3–CuO COMPOSITE CERAMICS

2013 ◽  
Vol 27 (06) ◽  
pp. 1350042 ◽  
Author(s):  
QING-SHOU LI ◽  
YUN-QIANG ZHANG ◽  
LI-BEN LI ◽  
GUO-ZHONG ZANG
Keyword(s):  
Dielectric Properties ◽  
Schottky Barrier ◽  
Dielectric Response ◽  
Oxygen Vacancies ◽  
Arrhenius Equation ◽  
Composite Ceramics ◽  
High Dielectric ◽  
Sintering Method ◽  
Very High ◽  
Barrier Model

The Ca 2 CuO 3– CaCu 2 O 3– CuO ceramics were synthesized by traditional solid-state sintering method. The complex dielectric response of the samples measured from 102–106 Hz and from 300–500 K reveals very high real part of ε > 104. The activation energy (being about 0.63 eV) calculated by the Arrhenius equation indicates that the oxygen vacancies may contribute to the high dielectric response. And the fitting to a Schottky barrier model of capacitance versus applied voltage suggests that the existence of Schottky barrier at the grain boundaries may be another important reason for the origination of good dielectric properties.

Preparation and dielectric properties of cyanoethyl cellulose/BaTiO3 flexible nanocomposite films

RSC Advances ◽  
2015 ◽  
Vol 5 (20) ◽  
pp. 15283-15291 ◽  
Author(s):  
Chao Jia ◽  
Ziqiang Shao ◽  
Haoyu Fan ◽  
Jianquan Wang
Keyword(s):  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Nanocomposite Films ◽  
High Dielectric Permittivity ◽  
Cyanoethyl Cellulose ◽  
High Dielectric ◽  
First Time

Cyanoethyl cellulose-based high dielectric permittivity nanocomposite films were successfully prepared for the first time by introducing BaTiO3 into cyanoethyl cellulose.

Effect of Powder Properties of Dielectric Filler on the Dielectric Properties of a Ceramics-Polymer Composite

2006 ◽  
Vol 320 ◽  
pp. 205-208
Author(s):  
Isao Kanada ◽  
Norimasa Sakamoto
Keyword(s):  
Particle Size ◽  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Lattice Strain ◽  
High Dielectric Permittivity ◽  
Powder Properties ◽  
High Dielectric

Effects of powder properties of the filler, including the particle size, the specific surface area and the lattice strain on the dielectric permittivity and Q of the ceramics-polymer composites were investigated in order to achieve composites with high dielectric permittivity and Q. The dielectric properties of the composites were strongly influenced by the powder properties of the filler, despite that the fillers have the same composition. Generally, lower specific surface area and lower lattice strain of the filler lead to higher Q of the composites.

Preparation of Mg and Ti Co-Doped NiO-Based Ceramic and its High Dielectric Properties

2008 ◽  
Vol 368-372 ◽  
pp. 37-39
Author(s):  
Bo Cheng ◽  
Yuan Hua Lin ◽  
Jing Nan Cai ◽  
Ce Wen Nan
Keyword(s):  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Temperature Dependence ◽  
Grain Boundaries ◽  
Activation Energies ◽  
High Permittivity ◽  
Polycrystalline Ceramic ◽  
High Dielectric ◽  
Co Doped

We present Mg and Ti co-doped NiO-based polycrystalline ceramic with high-permittivity dielectric properties. Analysis of the ceramic’s microstructure and composition proves that obvious grain boundaries NiTiO3 are formed. The measurements of frequency and temperature dependence of impedance and dielectric permittivity indicate that the grain and grain boundaries have remarkable influence on the dielectric properties due to the various activation energies.

A pore-size scale model for the dielectric properties of water-saturated clean rocks and soils

Geophysics ◽  
2006 ◽  
Vol 71 (6) ◽  
pp. F185-F193 ◽  
Author(s):  
Anthony L. Endres ◽  
Edward A. Bertrand
Keyword(s):  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Pore Space ◽  
Relative Size ◽  
Scale Model ◽  
Size Scale ◽  
Saturated Rock ◽  
Water Saturated ◽  
Free Media ◽  
The Relationship

The dielectric properties of water-saturated rock and soils are strongly dependent on the amount and nature of their porosity; interpretation of these geophysical data requires petrophysical models that incorporate both of these elements. The differential effective medium approximation (DEMA) is used to develop a dielectric permittivity model for clean (i.e., clay free) media that divides the pore spaces into elements corresponding to three categories of relative size scale: microscopic porosity (e.g., intergranular cracks), mesoscopic porosity (e.g., main pore volumes), and macroscopic porosity (e.g., vugs and fractures). The hierarchical size-scale structure imposed by the DEMA iterative embedding process is used to assign each pore space category its role in model construction. Use of this model demonstrates that the relationship between dielectric permittivity and porosity is significantly affected by the size scales of pores present in the rock models. A region of realizable permittivity-porosity values is obtained by varying the pore structure in the scaled-porosity model. The bounds of this region correspond to end-member porosity models. Analysis of experimental permittivity data for water-saturated sandstones and carbonates that cover a substantial range of porosity values found that the scaled-porosity models account for a significant part of the variability in experimental data.

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