The role of the dielectric loss of dispersed material in the electrorheological effect

1997 ◽  
Vol 70 (15) ◽  
pp. 1956-1958 ◽  
Author(s):  
Tian Hao
Keyword(s):  
Dielectric Loss ◽  
Electrorheological Effect ◽  
Dispersed Material

scholarly journals The role of adsorbed water on TiO2 particles in the electrorheological effect

AIP Advances ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 105319
Author(s):  
Zhaohui Qiu ◽  
Jing Huang ◽  
Rong Shen ◽  
Ying Wang ◽  
Xiaoyi Wu ◽  
...  
Keyword(s):  
Adsorbed Water ◽  
Tio2 Particles ◽  
Electrorheological Effect

The Dielectric Loss of Single Crystal and Polycrystalline TiO2

1997 ◽  
Vol 500 ◽  
Author(s):  
Xiaoru Wang ◽  
Alan Templeton ◽  
Stuart J. Penn ◽  
Neil McN. Alford
Keyword(s):  
Dielectric Loss ◽  
Single Crystal ◽  
Mixed Valence ◽  
Dielectric Materials ◽  
Oxygen Stoichiometry ◽  
Ion Conductor ◽  
Microwave Dielectric ◽  
Valence States ◽  
Oxygen Ion Conductor

ABSTRACTThe dielectric loss of single crystal and polycrystalline TiO2 has been studied. In polycrystalline TiO2 the dielectric loss is determined by both the microstructure and by the oxygen stoichiometry. Experiments have been carried out to determine the influence of both the microstructure (particularly porosity) and the oxygen stoichiometry. The TiO2 powder has been doped with partially stabilised zirconia, an oxygen ion conductor, in order to modify the oxygen stoichiometry. Sintered discs have been examined for loss as a function zirconia doping, pore volume and as a function of temperature. The behaviour of the doped and undoped titania powders is significantly different. Since many microwave dielectric materials contain Ti eg Ba-Ti-O, Ba-Nd-Ti-O, (Ba-RE-Ti-O, RE=Rare Earth), Zr-Sn-Ti-O etc it is essential to understand the role of the titanium, particularly as it can exist in mixed valence states, and the role of oxygen and its influence on the dielectric loss.

The utilization of time-resolved dielectric loss to probe the role of the surface in heterogeneous photochemistry

1986 ◽  
Vol 82 (12) ◽  
pp. 3625 ◽  
Author(s):  
Christopher J. Dobbin ◽  
Alan R. McIntosh ◽  
James R. Bolton ◽  
Zoran D. Popovic ◽  
John R. Harbour
Keyword(s):  
Dielectric Loss ◽  
Time Resolved

The Role of Interfacial Polarization in the Electrorheological Effects

1999 ◽  
Vol 13 (14n16) ◽  
pp. 1758-1766 ◽  
Author(s):  
Tian Hao ◽  
Akiko Kawai ◽  
Fumikazu Ikazaki
Keyword(s):  
Surface Properties ◽  
Inorganic Material ◽  
Response Times ◽  
Interfacial Polarization ◽  
Physical Ground ◽  
Electrorheological Effect ◽  
Orientation Process ◽  
Er Fluids

The conductive, dielectric and surface properties of severl water-free polymer or inorganic material based ER fluids, as well as their response times, are investigated to elucidate the physical ground of the electrorheological effect. It is found that the slow polarization, especially the interfacial polarization rather than the Debye polarization, should be responsible for the observed phenomena. Combining with the recent achievements (both theoretical and experimental) in the electrorheological field, we argue that is the interfacial polarization that does play a central role in electrorheological response. The particle re-orientation process is actually resulted from the large interfacial polarization.

scholarly journals Investigation on the role of the dielectric loss in metamaterial absorber

2010 ◽  
Vol 18 (7) ◽  
pp. 6598 ◽  
Author(s):  
ChengGang Hu ◽  
Xiong Li ◽  
Qin Feng ◽  
Xu’Nan Chen ◽  
XianGang Luo
Keyword(s):  
Dielectric Loss ◽  
Metamaterial Absorber

Carbon-Induced UV Sensitivity in Aluminum Nitride

1998 ◽  
Vol 4 (S2) ◽  
pp. 570-571
Author(s):  
Y. Berta ◽  
R. A. Gerhardt
Keyword(s):  
Dielectric Loss ◽  
Aluminum Nitride ◽  
Uv Irradiation ◽  
High Performance ◽  
High Energy ◽  
Multichip Modules ◽  
Low Oxygen ◽  
Carbon Impurities ◽  
Ultimate Purpose

Aluminum nitride, translucent, calcia-sintered and hot pressed, with its superior thermal properties has applications in high performance electronic devices such as multichip modules. In these applications, A1N is exposed to high energy electromagnetic sources which could alter its properties; for example, upon UV irradiation, thermal conductivity drops and dielectric loss increases. These observations indicate that the UV altered properties are due to the presence of impurities. The early studies concentrated primarily on oxygen doped samples, which photodarken upon UV exposure; the role of other impurities was not considered.In the current work, we consider the role of carbon in the microstructure of two very low oxygen content (< 0.3 wt %), carbon-containing samples, labeled B and E, for the ultimate purpose of 3 determining the mechanism by which carbon impurities affect the properties of A1N. Previous work on these samples correlated higher carbon content with a lower increase in the dielectric loss factor, after UV irradiation,

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