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Advanced mechanisms and applications of microwave-assisted synthesis of carbon-based materials: a brief review. [PDF]

Nanoscale Adv
Li Z, Peng K, Ji N, Zhang W, Tian W, Gao Z.   +5 more
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Design and Preparation of Benzoxazine Resin with High-Frequency Low Dielectric Constants and Ultralow Dielectric Losses

ACS Applied Polymer Materials, 2019
The new main-chain benzoxazine copolymer oligomers with bulky hydrocarbon end groups are first designed and synthesized. In particular, the aliphatic diamine based copolymers owning low dielectric constants (
Jiangbing Chen, M. Zeng, Zijia Feng, Tao Pang, Yiwan Huang, Qingyu Xu   +5 more
semanticscholar   +1 more source

Measurement of Dielectric Loss and Wall Loss in a Dielectric-Filled Waveguide

IEEE Transactions on Instrumentation and Measurement, 1974
A waveguide bridge capable of measuring dielectric loss down to 5 ?rad at frequencies of 10-35 GHz is described. A major uncertainty was the value of the wall loss. This has been resolved by measuring the wall loss of the specimen arm both with air and dielectric filling.
A. E. Parker, D. Marr, Sheila Ayers
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Transformer oil-based magnetic nanofluid with high dielectric losses tested for cooling of a model transformer

IEEE transactions on dielectrics and electrical insulation, 2019
An experimental study of dielectric permittivity and dissipation factor of transformer oil-based magnetic nanofluid is reported in this paper. The investigated nanofluid consists of a commercial transformer oil and iron oxide nanoparticles (0.93 % solid ...
M. Rajňák, M. Timko, P. Kopčanský, K. Paulovičová, J. Kuchta, M. Franko, J. Kurimský, B. Dolník, R. Cimbala   +8 more
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Dielectric loss in boron

Journal of the Less Common Metals, 1979
Abstract The temperature dependence of the dielectric loss (tgδ) in β-B was studied at temperatures ranging from −196 to 350 °C and at frequencies of 1–104 Hz. The curve of the temperature dependence of dielectric loss in an electric field with a frequency of 50 Hz showed two relaxation maxima at −65 and −45 °C characterized by activation energies of
G.F. Tavadze, G. V. Tsagareishvili, G. Sh. Darsavelidze, R.A. Khachapuridze, F. N. Tavadze   +4 more
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Facile Synthesis of Porous Nickel/Carbon Composite Microspheres with Enhanced Electromagnetic Wave Absorption by Magnetic and Dielectric Losses.

ACS Applied Materials and Interfaces, 2016
Porous nickel/carbon (Ni/C) composite microspheres with diameters of ca. 1.2-1.5 μm were fabricated by a solvothermal method combined with carbon reduction. The pore size of the synthesized Ni/C composite microspheres ranged from several nanometers to 50
Song Qiu, Hailong Lyu, Jiurong Liu, Yuzhen Liu, Nannan Wu, Wei Liu   +5 more
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Improved electromagnetic wave absorption of Co nanoparticles decorated carbon nanotubes derived from synergistic magnetic and dielectric losses.

Physical Chemistry, Chemical Physics - PCCP, 2016
In this study, we report a feasible way to synthesize carbon nanotube nanocomposites deposited with cobalt nanoparticles (20-30 nm) on the surface (Co/CNTs) to serve as an electromagnetic (EM) wave absorption material.
Nannan Wu, Hailong Lv, Jiurong Liu, Yuzhen Liu, Shenyu Wang, Wei Liu   +5 more
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Dielectric losses in ferroelectrics of displacive type as compared to the losses in ordinary dielectrics

Ferroelectrics, 1985
The theory of intrinsic (phonon) dielectric losses in ferroelectrics of displacive type is reviewed and compared with the theory of losses in ordinary dielectrics. The authors in 7-12 have calculated the temperature and frequency dependence of losses for a wide range of variation of the parameters.
V. L. Gurevich, Alexander K. Tagantsev
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Dielectric Polarization and Loss

Annual Review of Physical Chemistry, 1960
The subject of dielectric behavior has not previously been dealt with as such in these reviews, although dielectric properties relevant to other sub­ jects have often been mentioned. There have, however, been a number of comparatively recent books and review articles on various aspects of di­ electrics.
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Limiting losses in dielectrics

IEEE Transactions on Dielectrics and Electrical Insulation, 2001
Examination of a wide range of experimental data relating to 'low-loss' dielectric materials reveals the little acknowledged fact that their loss at high frequencies (kHz to GHz) and low temperatures (typically 100 to 200 K) is weakly or very weakly dependent on frequency, what we call 'flat loss', and is likewise weakly dependent on temperature ...
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