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Topic: Dielectric spectroscopy


  
  Dielectric spectroscopy - Wikipedia, the free encyclopedia
Dielectric spectroscopy (sometimes called impedance spectroscopy) measures the dielectric properties of a medium as a function of frequency [1-4].
Each dielectric mechanism is centered around its characteristic frequency, which is the reciprocal of the characteristic time of the process.
Dielectric relaxation as a whole is the result of the movement of dipoles (dipole relaxation) and electric charges (ionic relaxation) due to an applied alternating field, and is usually observed in the frequency range 10
en.wikipedia.org /wiki/Dielectric_spectroscopy   (395 words)

  
 Broadband Dielectric Spectroscopy
Broadband Dielectric Spectroscopy provides a powerful tool for investigating a variety of dielectric processes for both electrical and non-electrical applications.
TDR Dielectric Spectroscopy is related to conventional Time- Domain- Reflectometry used in closed-circuit fault testing [9-10].
An arc in the complex impedance plane demonstrates that material behaves as an electrolyte resistance in parallel with an interelectrode capacitance, allowing the bulk resistance to be quantified independent of electrochemical effects at the electrodes.
www.msi-sensing.com /broadband_dielectrics.htm   (1000 words)

  
 Mauritz - Dielectric Spectroscopy
Dielectric spectroscopy can provide information about the segmental mobility of a polymer by probing its dielectric properties.
The complex dielectric properties, the loss factor(e") and the relative permittivity(e'), are determined by performing several isothermal scans as a function of frequency.
Dielectric relaxation is the result of a movement of dipoles or electric charges due to a changing electric field in the frequency range of 10^2-10^10 Hz.
www.psrc.usm.edu /mauritz/dilect.html   (594 words)

  
 International Dielectrics Society
Since dielectric spectroscopy measures the time evolution of molecular polarization, the technique is especially sensitive to intermolecular interactions and their role in molecular cooperative processes.
Dielectric spectroscopy provides a link between the dynamics of molecular motion of the individual constituents of the complex material and the characterization of its bulk properties.
The recent successful developments of the Time Domain Dielectric spectroscopy methods and Broadband Dielectric Spectroscopy have radically changed the role of dielectric spectroscopy as an effective tool for structural investigation in solids and liquids on macroscopic, microscopic and mesoscopic levels.
www.permittivity.org   (178 words)

  
 Dielectric Relaxation Spectroscopy
DRS is able to monitor cooperative processes and thus provides a link between molecular spectroscopy, which monitors the properties of the individual constituents, and techniques characterizing the bulk properties of the sample, especially the viscoelastic and rheological behaviour.
Recently, dielectric heating has become a popular tool in chemical synthesis because it is not only very efficient but for several classes of reactions otherwise inaccessible product pathways are followed.
Barthel, H.Behret, and F.Schmithals, Dielectric Behaviour of Soltuions of Alkali Chlorides and Nitrates in the Microwave Region, Ber.
www.uni-regensburg.de /Fakultaeten/nat_Fak_IV/Physikalische_Chemie/Kunz/research/drs.html   (2153 words)

  
 Dielectric Spectroscopy.
In dielectric spectroscopy the current flowing through a sample cell containing a colloidal suspension and the voltage across this cell are measured as a function of frequency.
High polarization is manifested as a relative dielectric permittivity that may be much greater than that of the suspending medium.
Dielectric spectroscopy characterizes the dynamics of double layer relaxation and yields more information per measurement than static methods such as electrophoresis.
www.unisa.edu.au /laser/Research/Dielec.asp   (306 words)

  
 Amazon.com: Broadband Dielectric Spectroscopy: Books: Friedrich Kremer,Andreas Schönhals   (Site not responding. Last check: 2007-09-10)
Hence, broadband dielectric spectroscopy enables one to gain a wealth of information on the dynamics of bound (dipoles) and mobile charge carriers depending on the details of a molecular system.
It is the intention of this book to be both an introductory course to broadband dielectric spectroscopy as well as a monograph describing recent dielectric contributions to current topics.
An introductory course to broadband dielectric spectroscopy as well as a monograph describing recent dielectric contributions to actual topics, like the scaling of relaxation processes, molecular dynamics in confinement and non-resonant dielectric hole burning.
www.amazon.com /Broadband-Dielectric-Spectroscopy-Friedrich-Kremer/dp/3540434070   (866 words)

  
 Dielectric relaxation - Wikipedia, the free encyclopedia
Dielectric relaxation occurs in dielectrics, that is in insulating materials with negligible or small conductivity.
In physics, dielectric relaxation refers to the relaxation response of a dielectric medium to an external electric field of microwave frequencies.
This relaxation is often described in terms of permittivity as a function of frequency, which can, for ideal systems, be described by the Debye equation.
en.wikipedia.org /wiki/Dielectric_relaxation   (198 words)

  
 Amazon.com: Dielectric Spectroscopy of Polymeric Materials: Fundamentals and Applications (Acs Professional Reference ...   (Site not responding. Last check: 2007-09-10)
"Dielectric spectroscopy is a powerful tool for the investigation of dynamics of complex solid polymer systems, liquid crystals and blends, polymer solutions, and polymerization and curing reactions.
This together with advances in instrumentation, theory, and modeling, initiated renewed interest in the field in the past decade.
Beginning with a complete discussion of the fundamentals of dielectric spectroscopy, this book examines in detail the methods used in data modeling and in such specialized techniques as high-frequency dielectric measurements and thermally stimulated currents.
www.amazon.com /Dielectric-Spectroscopy-Polymeric-Materials-Fundamentals/dp/0841233357   (839 words)

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