Electric and Dielectric Properties

While the effect of static electric and magnetic fields on the bulk of the nematic phase 

The conductivity evolution in the aqueous medium, after addition of NZ clinoptilolite, was studied as function of temperature and time [OORl] - Fig. 33. In all cases a stepwise increase of conductivity takes place in approximately the first 500 min of the process, while a slower increase occurs afterwards, reaching a plateau after 10000 min. Both the values of the conductivity at the plateaus and the conductivity increase rate were temperature dependent. The increase of conductivity in solution seems to be basically associated to the release of sodium and iron species form the secondary phases. 

The effect of natural zeolite addition on the electrical properties of porcelain bodies were investigated between 50 °C T 600 °C [10D2]. The addition of zeolites increases the resistivity of the samples at 50 °C and decreases the resistivity at higher temperatures. The resistivity depends on sintering temperature. The activation energy of electrical resistivity of the samples was found to be in the range of 0.79... 0.87 eV. 

The dielectric properties of natural clinoptilolite were reported before and after electron irradiation with 8 MeV and thermal treatment [05Y1, 10K3]. In the frequency range of 200 Hz to 1 MHz, the dielectric constants decreased by more than two orders of magnitude. The dose dependence of the dielectric constant e determined at different frequencies, showed an increase up to a dose of lO el/cm and then sharply decreased - Fig. 37a. The frequency dependence of tgS, before and after electron irradiation has wide maxima - Fig. 37b. At high frequencies, the diminution of tgS was considerable. The data were analyzed on the basis of stractural defects formation and recombination of initial ones, as for conductivity [05 Yl]. 

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R. Wernicke, "Electrical and Dielectric Properties," in Ceramic Monographs-Handhook of Ceramics, Suppl Interceram. 34(6), No. 3.1.5. (1985). 

Kent, M. 1987. Electrical and Dielectric Properties of Food Materials. Science and Technology Publishers. Hornchurch, UK. 

The mononuclear, o/ r o-palladated 4,4 -bishexyloxyazoxybenzene acetylacetonate, (255), showed a nematic phase between 90 °C and 105 C, with temperatures very comparable to that of the free azoxy ligand (Cr SON 126 I). This complex, dubbed Azpac, has been subjected to a vast number of studies in order to analyze some specific properties such as electric and dielectric " properties, conductivity, viscoelasticity, and dynamics. ... 

Apart from its good slip and wear characteristics the advantages of PTFE are a. almost universal chemical resistance, b. insolubility in all known solvents below 300 °C, c. high thermal stability, d. continuous service temperature range -270 to 260 °C, e. low adhesion, f. low coefficient of friction, g. outstanding electrical and dielectric properties, h. resistant to stress cracking and weathering, but limited use in structural components because of the low modulus of elasticity. 

Another advantage of nanocomposites over microcomposites is the reduced filler content in nanocomposites, perhaps ten times lower than in microcomposites. This big difference in filler content and interfacial area will cause significant changes in various properties of polymer composites. It is reported that mechanical properties, heat resistance, thermal conductivity, flame retar-dancy, gas barrier properties, electrical and dielectric properties are much improved if polymers are so nanostructured. ... 

Kohlmeyer, B. R. Javadi, A. Pradhan, B. Pilla, S. Setyowati, K. Chen, J. Gong, S., Electrical and Dielectric Properties of Hydroxylated Carbon Nanotube-Elastomer Composites. J. Phys. Chem. C 2009,113,17626-17629. 

In the present conmiunication effect of nanosized filler particles of AI2O3 on electrical and dielectric properties of PVA based SPE have been investi ted. 

MWNT PTh - Chloro- form — Electric and dielectric properties [92]... 

Epoxy resins are widely used as embedding compounds and insulators in electrotechnology, because they exhibit excellent mechanical properties as well as good electrical and dielectric properties combined with relatively high surface tension that may hinder wetting, but improves adhesion. 

Manufacturers Comments Heat curing. Solvent-free. Aluminium oxide filler. High strength. High thermal conductivity. Excellent electrical and dielectric properties. Low viscosity version of Eccobond A 401. 

S.L. Shiw, and J. Liang, Effect of Multiwall Carbon Nanotubes on Electrical and Dielectric Properties of Yttria-Stabilized Zirconia Ceramic. J. Am. Ceram. Soc 2006 89 [11] 3533-3535. 

S. Lanfredi, J.F. Carvalho, A.C. Hernandes, Electric and dielectric properties of Bil2TiO20 single crystals. J. Appl. Phys. 88(1), 283-287 (2000)... 

POM is valued in E E applications for its high toughness (down to -40 °C), high hardness and stifiiiess, very good heat deflection resistance (operating temperature up to 100 °C), and good electrical and dielectric properties. 

Functional polymer nanocomposites consist of polymer matrices, including thermoplastics, thermosets and elastomers having nanoparticles or nanofillers dispersed in the polymer matrix. Two or more materials are combined to produce composites that possess properties that are unique and cannot be obtained from the individual materials acting alone. This new class of composite materials has shown enhanced optical, magnetic, mechanical, electrical and dielectric properties. They are important commercial materials with new combinations of structural and functional properties for applications in medicine, civil engineering, rubber and plastics, automotive and electrotechnical industries [39]. 

C. Calbei, S. Blacher, E. Gubbels, F. Brouers, R. Deltoiu, R. Jerome. Electrical and dielectrical properties of carbon black filled co-continuous two phase jxjlymer blends.. Phys. D. Appl. Phys., 32,1517-1525,1999. 

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