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Artigos de revistas sobre o tema "Dielectrical properties"

Autor: Grafiati
Publicado: 5 de outubro de 2024

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1

Zang, Chong Guang, e Xian Peng Cao. "PANI / MWNTs / EP Composite Microwave Absorbing Coatings Dielectrical and Microwave Absorbing Properties Analysis". Applied Mechanics and Materials 303-306 (fevereiro de 2013): 2477–80. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.2477.

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In this paper, the polyaniline (PANI) coated multi-walled carbon nanotubes (MWNTs) was prepared in situ polymerization. Adding PANI/MWNTs into epoxy resin（EP）, we got PANI / MWNTs / EP composite microwave absorbing materials. Through testing permittivity 、permeability and reflection loss of materials, the paper showed the effect of PANI/MWNTS to the dielectrical and microwave absorbing properties of materials.The results showed： PANI/MWNTs had great effect on dielectrical and microwave absorbing properties of materials. But the imaginary permeability was close to 0. That indicated that it mainly consumed electromagnetic wave by dielectric loss. In 200-1000MHZ, materials had better absorbing property and lower reflection loss (-13.6).
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2

Jayamani, Elammaran, e Muhammad Khusairy bin Bakri. "Preliminary Study on the Acoustical, Dielectric and Mechanical Properties of Sugarcane Bagasse Reinforced Unsaturated Polyester Composites". Materials Science Forum 890 (março de 2017): 12–15. http://dx.doi.org/10.4028/www.scientific.net/msf.890.12.

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In this research, the alkaline treated and untreated sugarcane bagasse was used as reinforcement with unsaturated polyester to make composites. The composites were made with 0 to 20 weight percentage of fibers using compression molding. Acoustical, dielectrical and mechanical properties of the composites were studied according to the American Society for Testing Materials (ASTM) standards. The result shows that the composites with higher sugarcane bagasse loading show higher acoustical and dielectrical properties. The composites tensile strength increased up to 10wt% of fiber loading and then starts decreasing eventually. Tensile strength and sound absorption coefficients of alkali treated fiber composites shown slightly better results than untreated fiber composites. The dielectric constant of treated fiber composites were lower compared with untreated fiber composites.
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3

Mobarak, Youssef, M. Bassyouni e M. Almutawa. "Materials Selection, Synthesis, and Dielectrical Properties of PVC Nanocomposites". Advances in Materials Science and Engineering 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/149672.

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Materials selection process for electrical insulation application was carried out using Cambridge Engineering Selector (CES) program. Melt mixing technique was applied to prepare polyvinyl-chloride- (PVC-) nanofumed silica and nanomontmorillonite clay composites. Surface analysis and particles dispersibility were examined using scanning electron microscope. Dielectrical properties were assessed using Hipot tester. An experimental work for dielectric loss of the nanocomposite materials has been investigated in a frequency range of 10 Hz–50 kHz. The initial results using CES program showed that microparticles of silica and clay can improve electrical insulation properties and modulus of elasticity of PVC. Nano-montmorillonite clay composites were synthesized and characterized. Experimental analyses displayed that trapping properties of matrix are highly modified by the presence of nanofillers. The nanofumed silica and nanoclay particles were dispersed homogenously in PVC up to 10% wt/wt. Dielectric loss tangent constant of PVC-nanoclay composites was decreased successfully from 0.57 to 0.5 at 100 Hz using fillers loading from 1% to 10% wt/wt, respectively. Nano-fumed silica showed a significant influence on the electrical resistivity of PVC by enhancing it up to 1 × 1011 Ohm·m.
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4

Skipina, Blanka, Dusko Dudic, Dusan Kostoski e Jablan Dojcilovic. "Dielectrical properties of composites LDPE+CB". Chemical Industry 64, n.º 3 (2010): 187–91. http://dx.doi.org/10.2298/hemind091221035s.

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There is currently great interest in the technological properties of conductive polymer composites because their cost-performance balance. They have a wide range of industrial applications -in anti-static materials, self regulating heaters, current overload and overheating protection devices, and materials for electromagnetic radiation shielding. Measurements of the electrical properties of polymer composites are one of the most convenient and sensitive methods for studying polymer structure. A polymer composite differs substantially from a free polymer in a wide range of properties. The presence of filler affects both the electrical, as well as mechanical properties. One of the most important characteristics of conductive polymer composites is that their electrical conductivity increases nonlinearly with the increase of the concentration of filler particles. When the concentration of filler particles reaches a certain critical value, a drastic transition from an electrical insulator to a conductor is exhibited. This conductivity behavior resulting in a sudden insulator-conductor transition is ascribed to a percolation process, and the critical filler concentration at which the conductivity jump occurs is called ?percolation threshold?. In the past few years, a lot of studies have been carried out to analyze the percolation phenomenon and mechanisms of the conductive behavior in conductive polymer composites. It has been established that the electrical conductivity of conductive polymer composites uncommonly depends on the temperature. Some of such composites show a sharp increase and/or decrease in electrical conductivity at specific temperatures. The conductive temperature coefficient (CTC) of conductive polymer composites has been widely investigated. In these work we investigated how concentration of the CB affects the dielectrical properties of the composite LDPE+CB. The ac electrical conductivity, ?ac, for such composites was measured. The temperature and frequency dependence of the dissipation factor were analyzed. It was found that the ac conductivity and dissipation factor were highly affected by the concentration of the filler.
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5

Haddour, Lillia, Mourad Keddam e Nadir Mesrati. "Relationships between Microstructure and Mechanical Properties of Polycristalline Alumina". Applied Mechanics and Materials 625 (setembro de 2014): 192–95. http://dx.doi.org/10.4028/www.scientific.net/amm.625.192.

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Some low purity alumina ceramics with an alumina content ranging from 86% to 93% were investigated, in order to explore the effects of microstructural parameters (grain size, intergranular phase) on mechanical (wear) and dielectrical parameters. The microstructure and worn surfaces were analysed using scaning electron microscopy. The correlation between microstructural, dielectrical properties and wear is discussed. It has been proposed that mechanical and electrical properties are two aspects of the same fundamental mechanism. Key words: Al2O3, Microstructure final, Wear resistance, Breakdown.
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6

Soni, Neha, Nikita Karma, Lalit Kumar Bhataniya, Paras Dubey e Netram Kaurav. "Investigation of Structural and Dielectric Properties of Sr doped LaCrO3Synthesized by Auto-Combustion Method". Journal of Physics: Conference Series 2603, n.º 1 (1 de outubro de 2023): 012027. http://dx.doi.org/10.1088/1742-6596/2603/1/012027.

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Abstract We synthesized the undoped lanthanum chromium oxide, LaCrO3 (LCO), and Strontium (Sr) doped La1-xSrxCrO3 (x=0.1) perovskite compounds using auto-combution method. X-ray Diffraction technique reveals that both the samples possess Cubic crystal structure with Pm-3m space group. Furthermore, room temperature dielectrical properties of both the samples were emphasized. Dielectric constant and loss value of both the samples decreases as frequency increases attributed to Maxwell-Wagner type of relaxation.
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7

Kang, Jie, Gui Xia Dong e Qiu Xiang Liu. "Research on Properties of AlN-Mo Composite Ceramic". Advanced Materials Research 482-484 (fevereiro de 2012): 1695–98. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.1695.

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With CaF2 and CaCO3 as sintering additives, AlN-Mo composite was prepared using hot pressed sintering technique. The phase composition and morphology of AlN-Mo composite ceramics were analyzed using XRD and SEM, respectively. The experimental results show that when CaF2 and CaCO3 additives is in a range of 1~3wt%, the thermal conductivity AlN-Mo composites increases with increasing of the CaF2 content; With the increasing of CaCO3 content, first increases and then decreases. Sintering additives in a certain type and content, the thermal conductivity of AlN-Mo composite ceramics with 20 vol% Mo is higher than containing 18 vol% Mo. The dielectrical property of AlN-Mo composite ceramics was also discussed. The addition of CaF2 can decrease the dielectric constant of AlN-Mo composite ceramics.
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8

Maurya, M. K. "Study of Dielectric Properties of Typical Electrical Insulating Materials by Terahertz Wave Spectroscopy". International Journal for Research in Applied Science and Engineering Technology 12, n.º 8 (31 de agosto de 2024): 632–40. http://dx.doi.org/10.22214/ijraset.2024.63973.

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Abstract: This research paper uses a special kind of light is called terahertz waves to study the properties of materials that prevent electricity from flowing, like plastics and glass. Dielectrical insulating materials play an important role in the Insulation coordination of electric power systems such as transformers and high Voltage power cable. Dielectric insulating materials are evaluated based on their dielectric constant, dielectric strength, loss tangent, and thermal stability. The dielectric constant determines the material's ability to store electrical energy, while the dielectric strength indicates the maximum electric field the material can withstand without breaking down. The loss tangent measures energy dissipation as heat, which is crucial for minimizing energy losses in electrical systems. Terahertz (THz) wave spectroscopy has emerged as a powerful technique for the non-destructive evaluation of dielectric properties in electrical insulating materials. This study investigates the application of THz time-domain spectroscopy (THz-TDS) for characterizing typical insulating materials such as polyethylene (PE), polytetrafluoroethylene (PTFE), and epoxy resins. This research can help improve the design and performance of electrical devices, making them safer, more efficient, and more reliable.
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9

Journal, Baghdad Science. "Investigation of the dielectric Properties of (PPAB) terminated by phenylenediamine doped by Na2[Fe(CN)5.NO].2H2O using Lumped equivalent circuit". Baghdad Science Journal 13, n.º 1 (6 de março de 2016): 174–82. http://dx.doi.org/10.21123/bsj.13.1.174-182.

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The aim of this paper is to demonstrate the effect of Na2[Fe(CN)5.NO].2H2O impurity (0.1 M) concentration on the dielectrical properties of poly (P-Aminobenzaldehyde) terminated by pheneylenediamine in the frequency and temperature ranges (1-100)KHz and (283-348) K respectively.These properties include dissipation factor, series and parallel resistance, series and parallel capacitance, real and imaginary part of the dielectric constant, a.c conductivity and impedance (real and imaginary) part, that have been deduced from equivalent circuit. The investigation shows that adding Na2[Fe(CN)5.NO].2H2O as additive to the polymer lead to increase of the dielectric constant with increasing temperature and it is decreasing with increasing the frequency .The dissipation factor is increasing with as the frequency increased.
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10

Turky, Ali Omar, Mohamed Mohamed Rashad, Zaki Ismail Zaki, Ibrahim Ahmed Ibrahim e Mikhael Bechelany. "Tuning the optical and dielectric properties of calcium copper titanate CaxCu3−xTi4O12 nanopowders". RSC Advances 5, n.º 24 (2015): 18767–72. http://dx.doi.org/10.1039/c4ra15222k.

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11

Najeeb, Hussein Neama. "Dielectrical and electrical properties of PVA-NaI composites". Iraqi Journal of Physics (IJP) 11, n.º 22 (20 de fevereiro de 2019): 56–63. http://dx.doi.org/10.30723/ijp.v11i22.353.

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The electrical characteristics of polyvinyl alcohol PVA doped with different concentrations (0, 1, 2, 3 and 4wt%) of sodium iodide NaI powder were studied. The films are prepared using solution casting technique, in order to investigate the effect of sodium iodide NaI additions on the electrical properties of PVA host. The D.C conductivity measured by measuring the D.C electrical resistance using the Keithly Electrometer type 616C, and for different temperatures ranging from 30 – 70oC. The dielectric properties measured by measuring the capacitor and the loss angle tangent as a function of the alternating electric field frequency using the Agilent impedance analyzer 4294A, within the frequency range 50 – 6 ×106 Hz at room temperature. The experimental results showed that the dielectric constant is decrease with increase frequency of applied electrical field and increase with increasing concentrations, dielectric loss is increase with increasing frequency of applied electrical field to be 1MHz after this it was decreasing, A.C electrical conductivity are increasing with increasing frequency of applied electrical field, also, the results showed that the D.C electrical conductivity are increasing with increase concentration of NaI and temperature, activation energy are decreasing with increase concentration of additive salt.
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12

Gu, Hongbo, Yudong Huang, Xi Zhang, Qiang Wang, Jiahua Zhu, Lu Shao, Neel Haldolaarachchige, David P. Young, Suying Wei e Zhanhu Guo. "Magnetoresistive polyaniline-magnetite nanocomposites with negative dielectrical properties". Polymer 53, n.º 3 (fevereiro de 2012): 801–9. http://dx.doi.org/10.1016/j.polymer.2011.12.033.

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13

Laboranti, L. M., E. R. Mognaschi, G. Gozzelino e A. Priola. "Dielectrical properties of u.v. cured acrylated polysiloxane films". Journal of Materials Science 30, n.º 6 (março de 1995): 1473–79. http://dx.doi.org/10.1007/bf00375251.

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14

İÇİER, FILIZ, e TANER BAYSAL. "Dielectrical Properties of Food Materials—2: Measurement Techniques". Critical Reviews in Food Science and Nutrition 44, n.º 6 (novembro de 2004): 473–78. http://dx.doi.org/10.1080/10408690490892361.

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15

Zamiri, Reza, Hossein Abbastabar Ahangar, Ajay Kaushal, Azmi Zakaria, Golnoosh Zamiri, David Tobaldi e J. M. F. Ferreira. "Dielectrical Properties of CeO2 Nanoparticles at Different Temperatures". PLOS ONE 10, n.º 4 (24 de abril de 2015): e0122989. http://dx.doi.org/10.1371/journal.pone.0122989.

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16

Eissa. "Structural and Dielectrical Properties of Sterilized Human Teeth". Physics International 3, n.º 1 (1 de janeiro de 2012): 22–27. http://dx.doi.org/10.3844/pisp.2012.22.27.

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17

Jeidd, Abddaim, Mohamed Amghar, A. Mabrouki, A. Benali, A. Trabelsi, E. Dhahri, K. Khirouni e B. F. O. Costa. "Study of physical properties of the Li0.5MgFe1.5O3.5 ferrite nanoparticles". RSC Advances 13, n.º 19 (2023): 12906–16. http://dx.doi.org/10.1039/d2ra07970d.

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In the present research study, the structural, optical, magnetic, electrical and dielectrical properties of the spinel ferrite Li0.5MgFe1.5O3.5, synthesized using a sol–gel auto-combustion method were studied.
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18

Zhang, Yu, e Chuan Guo Ma. "Preparation and Electrical Properties of Aligned Carbon Nanotubes/Epoxy Resin Composites Induced by a Low Magnetic Field". Advanced Materials Research 189-193 (fevereiro de 2011): 1340–43. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.1340.

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Aligned carbon nanotubes(CNTs)/epoxy resin(EP) composites were prepared under a low magnetic field (B<500mT) induction. The effect of different magnetic fields on the electrical and dielectrical properties of composites was investigated. The results show that the CNTs are aligned with rod-like aggregations instead of single CNTs when the magnetic field direction is vertical to the casting direction of samples, then electric conductivity, permittivity, dielectric loss of the composite are improved. And a larger magnetic field intensity and a bigger mould capacity can help the effect of magnetic field induction. However the CNTs are seriously aggregated and the electrical properties of composites change worse when the magnetic field direction is parallel to the casting direction of samples.
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19

Rosaiah, P. "Synthesis, Electrical And Dielectrical Properties Of Lithium Iron Oxide". Advanced Materials Letters 4, n.º 4 (1 de abril de 2013): 288–95. http://dx.doi.org/10.5185/amlett.2012.8416.

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20

Lyashchenko, A. K., I. V. Balakaeva, Yu A. Simonova e L. M. Timofeeva. "Hydration and dielectrical properties of aqueous pyrrolidinium trifluoroacetate solutions". Russian Journal of Physical Chemistry A 91, n.º 10 (20 de setembro de 2017): 1913–18. http://dx.doi.org/10.1134/s0036024417100247.

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21

Zamiri, Reza, Hossein Abbastabar Ahangar, Ajay Kaushal, Azmi Zakaria, Golnoosh Zamiri, David Tobaldi e J. M. F. Ferreira. "Correction: Dielectrical Properties of CeO2 Nanoparticles at Different Temperatures". PLOS ONE 10, n.º 7 (2 de julho de 2015): e0131851. http://dx.doi.org/10.1371/journal.pone.0131851.

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22

El-Ghamaz, N. A., A. Z. El-Sonbati, M. A. Diab, A. A. El-Bindary, M. K. Awad e Sh M. Morgan. "Dielectrical, conduction mechanism and thermal properties of rhodanine azodyes". Materials Science in Semiconductor Processing 19 (março de 2014): 150–62. http://dx.doi.org/10.1016/j.mssp.2013.12.005.

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23

El-Ghamaz, N. A., E. M. El-Menyawy, M. A. Diab, A. A. El-Bindary, A. Z. El-Sonbati e S. G. Nozha. "Optical and dielectrical properties of azo quinoline thin films". Solid State Sciences 30 (abril de 2014): 44–54. http://dx.doi.org/10.1016/j.solidstatesciences.2014.02.005.

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24

Mat Sauki, Siti Syafiqah, Nor Asiah Muhamad e Zawani Amirah Rasid. "Virgin coconut oil dielectrical properties as electrical insulation material". Bulletin of Electrical Engineering and Informatics 8, n.º 3 (1 de setembro de 2019): 1154–61. http://dx.doi.org/10.11591/eei.v8i3.1603.

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Mineral oil played an important role as insulating liquid such as to reduce failure, ageing effect, increase the life span and heat transfer agent. Mineral oil had a good dielectric strength and cooling performance but it had serious negative environmental impact like non-biodegradable, non-renewable resource and difficult to dispose when it deteriorates completely. Hence, virgin coconut oil (VCO) was chosen as alternative to replace mineral oil since it biodegrades completely without toxic and easy to get in the tropical country. Three dielectric tests were conducted to investigate the dielectric properties of VCO. Those were breakdown voltage, water content and kinematic viscosity. A study about the effect of the moisture level of VCO on the breakdown voltage and kinematic viscosity was also presented. VCO and mineral oil also undergone heating process to reduce moisture in sample. The study showed that VCO has good potential breakdown voltage with the ability to absorb a lot of moisture keeping the KRAFT paper dry. However, VCO had very high kinematic viscosity compared to mineral oil. Further, the rate of breakdown voltage decreases with increasing of moisture of VCO was lower than mineral oil.
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25

El-Menyawy, E. M., I. T. Zedan e A. M. Mansour. "Electrical Conductivity and Dielectrical Properties of Bulk Methylene Green". Journal of Electronic Materials 46, n.º 7 (6 de março de 2017): 4353–58. http://dx.doi.org/10.1007/s11664-017-5414-z.

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26

Barreto, A. C. H., M. M. Costa, A. S. B. Sombra, D. S. Rosa, R. F. Nascimento, S. E. Mazzetto e P. B. A. Fechine. "Chemically Modified Banana Fiber: Structure, Dielectrical Properties and Biodegradability". Journal of Polymers and the Environment 18, n.º 4 (9 de junho de 2010): 523–31. http://dx.doi.org/10.1007/s10924-010-0216-x.

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27

Urbiztondo, M., S. Irusta, R. Mallada, M. P. Pina e J. Santamaría. "Evaluation of optical and dielectrical properties of the zeolites". Desalination 200, n.º 1-3 (novembro de 2006): 601–3. http://dx.doi.org/10.1016/j.desal.2006.03.437.

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28

Rahmouni, H., M. Smari, B. Cherif, E. Dhahri e K. Khirouni. "Conduction mechanism, impedance spectroscopic investigation and dielectric behavior of La0.5Ca0.5−xAgxMnO3 manganites with compositions below the concentration limit of silver solubility in perovskites (0 ≤ x ≤ 0.2)". Dalton Transactions 44, n.º 22 (2015): 10457–66. http://dx.doi.org/10.1039/c5dt00444f.

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Bitenieks, Juris, Remo Merijs Meri, Janis Zicans e Mārtiņš Kalniņš. "Characterization of Polyvinyl Acetate/Multi Walled Carbon Nanotube Nanocomposites". Key Engineering Materials 721 (dezembro de 2016): 13–17. http://dx.doi.org/10.4028/www.scientific.net/kem.721.13.

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Nanocomposite films from polyvinyl acetate (PVAc) dispersion and multi walled carbon nanotubes (MWCNTs) were prepared by solution casting technique. Stress-strain properties showed increase in elastic modulus and yield strength. Mechanical properties characterized by dynamic mechanical thermal analysis represented increase in storage modulus below glass transition temperature. Studied dielectrical properties of PVAc/MWCNT nanocomposites revealed formation of conductive MWCNT network in PVAc matrix.
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30

Spasović, Slavica, N. Paunović, D. Popović e Jablan Dojčilović. "Infrared and Dielectrical Properties of SrTiO3:Nd". Materials Science Forum 518 (julho de 2006): 471–76. http://dx.doi.org/10.4028/www.scientific.net/msf.518.471.

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Far-infrared reflection spectra and results of dielectric measurements of SrTiO3 single crystal doped by neodymium are presented in the paper. Dielectric investigations were conducted at temperature range from 25 K to room temperature for the test frequency 1MHz. The numerical analysis of the far-infrared reflection spectra made using a fitting procedure based on factorized form of the dielectric function. The results for SrTiO3: Nd are compared with those for pure crystal. The lowest-frequency phonon mode is found to be strongly influenced by presence of neodymium ions in SrTiO3 single crystal.
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31

EL-Ghamaz, N., E. Gaml e Hajar Abusnina. "Study on Structural and Dielectrical Properties of some Chloroquinoxaline Derivatives". Scientific Journal for Damietta Faculty of Science 10, n.º 1 (1 de dezembro de 2020): 37–44. http://dx.doi.org/10.21608/sjdfs.2020.194998.

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Frickel, Natalia, Anna Gutina Greenbaum, Moshe Gottlieb e Annette M. Schmidt. "Magnetic Properties and Dielectrical Relaxation Dynamics in CoFe2O4@PU Nanocomposites". Journal of Physical Chemistry C 115, n.º 22 (18 de maio de 2011): 10946–54. http://dx.doi.org/10.1021/jp111348e.

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Hamza, Saidi, Asya Mhamdi, Walid Aloui, Abdelaziz Bouazizi e Kamel Khirouni. "Effect of illumination on the dielectrical properties of P3HT:PC70BM nanocomposites". Materials Research Express 4, n.º 5 (2 de maio de 2017): 055003. http://dx.doi.org/10.1088/2053-1591/aa6ac1.

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Kaygili, Omer, Serhat Keser, Sergey V. Dorozhkin, Fahrettin Yakuphanoglu, Ahmed A. Al-Ghamdi, Sevda Kirbag, Duygu Sertkaya, Tankut Ates e N. Canan Gursoy. "Structural and Dielectrical Properties of Ag- and Ba-Substituted Hydroxyapatites". Journal of Inorganic and Organometallic Polymers and Materials 24, n.º 6 (3 de setembro de 2014): 1001–8. http://dx.doi.org/10.1007/s10904-014-0074-4.

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Sanchis, Maria J., Belén Redondo-Foj, Marta Carsí, Pilar Ortiz-Serna, Mario Culebras, Clara M. Gómez, Andrés Cantarero e Rafael Muñoz-Espí. "Controlling dielectrical properties of polymer blends through defined PEDOT nanostructures". RSC Advances 6, n.º 66 (2016): 62024–30. http://dx.doi.org/10.1039/c6ra05597d.

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Yadav, S. P., S. S. Shinde, A. A. Kadam e K. Y. Rajpure. "Structural, morphological, dielectrical, magnetic and impedance properties of Co1−xMnxFe2O4". Journal of Alloys and Compounds 555 (abril de 2013): 330–34. http://dx.doi.org/10.1016/j.jallcom.2012.12.089.

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Sundarabharathi, Lakshmanaperumal, Mahendran Chinnaswamy, Hemalatha Parangusan, Deepalekshmi Ponnamma e Mariam Al Ali Al-Maadeed. "Cytocompatibility and Dielectric Properties of Sr2+ Substituted Nano-Hydroxyapatite for Triggered Drug Release". Frontiers in Advanced Materials Research 1, n.º 1 (30 de maio de 2019): 18–24. http://dx.doi.org/10.34256/famr1913.

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Hydroxyapatite (Ca5(PO4)3OH) is a well-known bioceramics material used in medical applications because of its ability to form direct chemical bonds with living tissues. In this context, we investigate the biocompatibility and dielectric properties of Sr2+-substituted hydroxyapatite nanoparticles were synthesized by sol-gel method. The influence of strontium on the crystal structure, functional group, morphological, electrical properties, and biocompatibility of as-synthesized nano-hydroxyapatite samples was analyzed using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and field emission scanning electron microscopy (FE-SEM). Dielectrical properties of the bioactive Sr-HA sample were investigated by a dielectric impedance spectroscopy method. The observed results illustrate the incorporation of Sr2+ ions in the apatite lattice could influence the pure HA properties, by reducing the crystallite size and crystallinity quite consistent with the morphology variation. The ac conductivity (σac) increased with an increasing applied frequency confirmed that prepared HA sample exhibited the universal power law nature. Further, the in vitro drug loading and release studies using doxycycline as a model drug demonstrate that the Sr2+ -HA nanoparticles show high drug adsorption capacity and sustained drug release. Thus, the improved bioceramics system could be a promising candidate for future biomedical applications.
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38

Banjuraizah, Johar, Mohd Haziq Che Ani e A. R. Mohamed. "Preparation and Structural Characterization of CaCu3Ti4O12 Doped with Nickel, Ferrite, Manganese and Cobalt". Advanced Materials Research 893 (fevereiro de 2014): 69–74. http://dx.doi.org/10.4028/www.scientific.net/amr.893.69.

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Transition metal oxide-doped CCTO (CaCu3Ti4O12) ceramics were prepared by a conventional solgel synthesis method and the effects of pure CCTO and CCTO doped with Mn, Fe, Co, Ni to the crystal structure, microstructures and dielectrical properties of samples were investigated. The phase composition and microstructure were studied by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD analysis reveals that all samples exhibited multiphases with the pseudo-perovskite cubic CCTO phase with space group Im-3 as the main phase in undoped and doped CCTO samples. Peaks of monoclinic CuO and peroveskite CaTiO3 could also be seen in all samples which indicate that solid solution of CuO in CaTiO3 lattice was incomplete.SEM results show that doping effectively enhanced densification. SEM micrographs also suggested that the morphologies of doped CCTO ceramics had showed a matrix consisting of large grains wherein the small grains were embedded between the larger grains. Dielectric properties of pure and doped CCTO were investigated in a broad frequency range of the dielectric constant reached a value as high as εr = 29.4 at room temperature for CCTO doped with Ni at frequency (1000 Hz). Besides the sintering conditions, the microstructure and the dielectric properties of the CCTO are strongly influenced by type of doping elements.
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39

Khan, K., e Ashari Maqsood. "Electrical, Dielectrical and Magnetic Properties of Zr-Mn Doped Nano-Ferrites". Key Engineering Materials 510-511 (maio de 2012): 301–6. http://dx.doi.org/10.4028/www.scientific.net/kem.510-511.301.

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We measured the dc electrical resistivity as a function of temperature and dielectric parameters in the frequency range 100 Hz to 3 MHz of nanosized Zr-Mn spinel ferrites with nominal composition CoFe2-2xZrxMnxO4(0.1x0.4). The dc electrical resistivity decreased with the rise in temperature for all the samples, showing a semiconductor like behavior. From the dc electrical resistivity the activation energy and drift mobility are determined. Both the drift mobility and activation energy increase with a rise inx. The dielectric constant, dielectric (losses) and ac electrical resistivity as a function of frequency are also reported. The low field ac magnetic susceptibility measurement showed that the ferrimagentic transition temperature is in the range of 4395 K to 6585 K.
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40

Abd, Abeer. "Studying the mechanical and electrical properties of epoxy with PVC and calcium carbonate filler". International Journal of Engineering & Technology 3, n.º 4 (30 de novembro de 2014): 545. http://dx.doi.org/10.14419/ijet.v3i4.3425.

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In the present research composite material was prepared from epoxy and PVC reinforced with calcium carbonate as a filler material with different percent weight ratios (0.6,1.2,1.8 and 2.4) g.The effect of different weight ratios of calcium carbonate particles and PVC different content on electrical permittivity , dielectrical loss constant, hardness ,young modulus and compression strength were studied. Electrical properties of these composites were investigated by using Fourier transform infrared spectroscopy (FTIR) to study the bonds which enhanced the insulating properties of epoxy material compounded with filler and PVC. The inclusion of CaCO3 in epoxy and (PVC) polymer matrices greatly enhances the physical and mechanical properties of the composite.The experimental results also show that sample (5) compounded with 2.4 g of Calcium Carbonate has the minimum dielectric loss therefore it had the best insulating properties. The compression strength, young modulus, hardness decrease with filler content increase and PVC compound decreased. The maximum electrical permittivity in sample (3) compounded with 1.2 g of calcium carbonate and 4.8 g of PVC. Cost also can be reduced by the addition of filler material.
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41

Najeeb, Hussein Neama. "Dielectrical and Electrical Properties of Polystyrene films Doped with Copper Sulfate". University of Thi-Qar Journal of Science 4, n.º 4 (10 de julho de 2014): 181–86. http://dx.doi.org/10.32792/utq/utjsci/v4i4.689.

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The electrical characteristics of polystyrene doped with different concentrations (0,1,2,3,and 4wt%) of Copper Sulfate CuSO4.5H2O powder were studied . The films are prepared using solution casting technique, in order to investigate the effect of Copper Sulfate CuSO4.5H2O additions on the electrical properties of PS host. The D.C conductivity measured by measuring the D.C electrical resistance using the( Keithly Electrometer type 616C), and for different temperatures ranging from (30 – 80)oC . The dielectric properties measured by measuring the capacitor and the loss angle tangent as a function to the alternating electric field frequency using the (Agilent impedance analyzer 4294A), within the frequency range (50 – 6 ×106) Hz at room temperature. The experimental results showed that the dielectric constant is decrease with increase frequency of applied electrical field and increase with increasing concentrations, dielectric loss is decrease with increasing frequency of applied electrical field to be 0.5 MHz after this it was increasing , A.C electrical conductivity are increasing with increasing frequency of applied electrical field ,also, the results showed that the D.C electrical conductivity are increasing with increase concentration of PS and temperature, activation energy are decreasing with increase concentration of additive salt
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42

Aristizabal, M. E., J. Eiras, D. Garcia e F. A. Londoño. "Structural, microstructural and dielectrical properties of Yb doped PLMN-13PT ceramics". Ferroelectrics 545, n.º 1 (11 de junho de 2019): 141–49. http://dx.doi.org/10.1080/00150193.2019.1626655.

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43

Orliukas, A. F., E. Kazakevicius, A. Kezionis, T. Salkus, I. P. Studenyak, R. Yu Buchuk, I. P. Prits e V. V. Panko. "Preparation, electric conductivity and dielectrical properties of Cu6PS5I-based superionic composites". Solid State Ionics 180, n.º 2-3 (9 de março de 2009): 183–86. http://dx.doi.org/10.1016/j.ssi.2008.12.005.

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Costa, L. C., F. Henry, M. A. Valente, S. K. Mendiratta e A. S. Sombra. "Electrical and dielectrical properties of the percolating system polystyrene/polypyrrole particles". European Polymer Journal 38, n.º 8 (agosto de 2002): 1495–99. http://dx.doi.org/10.1016/s0014-3057(02)00044-7.

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Li, Xue, Xiaoming Wang, Ling Weng, Yang Yu, Xiaorui Zhang, Lizhu Liu e Cheng Wang. "Dielectrical properties of graphite nanosheets/PVDF composites regulated by coupling agent". Materials Today Communications 21 (dezembro de 2019): 100705. http://dx.doi.org/10.1016/j.mtcomm.2019.100705.

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46

Hamerton, Ian, Brendan J. Howlin, Amy L. Mitchell, Lisa T. McNamara e Shinji Takeda. "Systematic examination of thermal, mechanical and dielectrical properties of aromatic polybenzoxazines". Reactive and Functional Polymers 72, n.º 10 (outubro de 2012): 736–44. http://dx.doi.org/10.1016/j.reactfunctpolym.2012.07.001.

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47

Markevich, M. A., E. V. Prut, V. V. Potapov, V. G. Shevchenko e A. T. Ponomarenko. "Mechanical and dielectrical properties of the cured epoxide-dianephenol-formaldehyde oligomers". Polymer Science U.S.S.R. 27, n.º 4 (janeiro de 1985): 955–64. http://dx.doi.org/10.1016/0032-3950(85)90436-8.

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48

Yıldırım, Murat, Faruk Özel, Adem Sarılmaz, Abdalaziz Aljabour e İmren Hatay Patır. "Investigation of structural, optical and dielectrical properties of Cu2WS4 thin film". Journal of Materials Science: Materials in Electronics 28, n.º 9 (20 de janeiro de 2017): 6712–21. http://dx.doi.org/10.1007/s10854-017-6365-0.

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İÇİER, FILIZ, e TANER BAYSAL. "Dielectrical Properties of Food Materials—1: Factors Affecting and Industrial Uses". Critical Reviews in Food Science and Nutrition 44, n.º 6 (novembro de 2004): 465–71. http://dx.doi.org/10.1080/10408690490886692.

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Aloui, Walid, Adnen Ltaief e Abdelaziz Bouazizi. "Dielectrical properties of PET-MWCNT/P3HT:PC70BM/Al device: Impedance spectroscopy analysis". Microelectronic Engineering 129 (novembro de 2014): 96–99. http://dx.doi.org/10.1016/j.mee.2014.07.026.

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