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.

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.

The role of epoxy matrix occlusions within BaTiO 3 nanoparticles on the dielectric properties of functionalized BaTiO 3 /epoxy nanocomposites

2016 ◽  
Vol 90 ◽  
pp. 528-535 ◽  
Author(s):  
Thi Tuyet Mai Phan ◽  
Ngoc Chau Chu ◽  
Van Boi Luu ◽  
Hoan Nguyen Xuan ◽  
Isabelle Martin ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Epoxy Matrix ◽  
Epoxy Nanocomposites

Two-dimensional nanosheets of MoS2: a promising material with high dielectric properties and microwave absorption performance

Nanoscale ◽  
2015 ◽  
Vol 7 (38) ◽  
pp. 15734-15740 ◽  
Author(s):  
Ming-Qiang Ning ◽  
Ming-Ming Lu ◽  
Jing-Bo Li ◽  
Zhuo Chen ◽  
Yan-Kun Dou ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Promising Material ◽  
Two Dimensional ◽  
Wide Bandwidth ◽  
Absorption Performance ◽  
High Dielectric ◽  
Microwave Absorption Performance ◽  
Minimum Reflection Loss

MoS2 nanosheets (MoS2-NS) exhibit a minimum reflection loss of −38.42 dB and a wide bandwidth with effective attenuation (<−10 dB) up to 4.1 GHz at a thickness of 2.4 mm.

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.

scholarly journals The Primary Origin of Excellent Dielectric Properties of (Co, Nb) Co-Doped TiO2 Ceramics: Electron-Pinned Defect Dipoles vs. Internal Barrier Layer Capacitor Effect

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3230
Author(s):  
Theeranuch Nachaithong ◽  
Narong Chanlek ◽  
Pairot Moontragoon ◽  
Prasit Thongbai
Keyword(s):  
Dielectric Properties ◽  
Loss Tangent ◽  
Barrier Layer ◽  
Dielectric Response ◽  
High Resistivity ◽  
Low Loss ◽  
Rutile Tio2 ◽  
Complex Defect ◽  
Very High ◽  
Co Doped

(Co, Nb) co-doped rutile TiO2 (CoNTO) nanoparticles with low dopant concentrations were prepared using a wet chemistry method. A pure rutile TiO2 phase with a dense microstructure and homogeneous dispersion of the dopants was obtained. By co-doping rutile TiO2 with 0.5 at.% (Co, Nb), a very high dielectric permittivity of ε′ » 36,105 and a low loss tangent of tanδ » 0.04 were achieved. The sample–electrode contact and resistive outer-surface layer (surface barrier layer capacitor) have a significant impact on the dielectric response in the CoNTO ceramics. The density functional theory calculation shows that the 2Co atoms are located near the oxygen vacancy, creating a triangle-shaped 2CoVoTi complex defect. On the other hand, the substitution of TiO2 with Nb atoms can form a diamond-shaped 2Nb2Ti complex defect. These two types of complex defects are far away from each other. Therefore, the electron-pinned defect dipoles cannot be considered the primary origins of the dielectric response in the CoNTO ceramics. Impedance spectroscopy shows that the CoNTO ceramics are electrically heterogeneous, comprised of insulating and semiconducting regions. Thus, the dielectric properties of the CoNTO ceramics are attributed to the interfacial polarization at the internal insulating layers with very high resistivity, giving rise to a low loss tangent.

scholarly journals Multifunctional epoxy nanocomposites reinforced by two-dimensional materials: A review

Carbon ◽  
2021 ◽  
Vol 185 ◽  
pp. 57-81
Author(s):  
Ming Dong ◽  
Han Zhang ◽  
Lazaros Tzounis ◽  
Giovanni Santagiuliana ◽  
Emiliano Bilotti ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Epoxy Nanocomposites ◽  
Two Dimensional Materials
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