Effect of thickness and length of the sample on the dielectric constant ε′ and loss ε″ measurements in the microwave cavity perturbation technique

1988 ◽  
Vol 109 (1) ◽  
pp. K75-K78
Author(s):  
V. R. K. Murthy ◽  
R. Raman
Keyword(s):  
Dielectric Constant ◽  
Perturbation Technique ◽  
Microwave Cavity ◽  
Cavity Perturbation ◽  
Microwave Cavity Perturbation

scholarly journals Dielectric properties of myoglobin at 10 GHz by microwave cavity perturbation measurements

2010 ◽  
Vol 24 (1-2) ◽  
pp. 143-147 ◽  
Author(s):  
M. Bonura ◽  
G. Schirò ◽  
A. Cupane
Keyword(s):  
Dielectric Constant ◽  
Imaginary Part ◽  
Perturbation Technique ◽  
Resonant Cavity ◽  
Hydration Shell ◽  
Microwave Cavity ◽  
Glass Capillary ◽  
Cavity Perturbation ◽  
Clear Peak ◽  
Microwave Cavity Perturbation

We report on the temperature dependence, at microwave (mw) frequency, of the imaginary part of the dielectric constant (ε″) in myoglobin powder samples with different hydration levels (h). The measurements have been performed by the cavity perturbation technique, in the range of temperature 80–345 K. The sample is located inside a glass capillary along the axis of a cylindrical copper cavity, resonating in the TE011mode at 9.6 GHz, where the mw electric field has a node. By measuring the variation of the quality factor of the resonant cavity, one can extract the imaginary part of the dielectric constant. At temperatures higher than 230 K we observe an evident increase of the dielectric losses with increasing temperature; the effect scales almost linearly with hydration, indicating that it must be attributed to a relaxation of water in the hydration shell of the protein. Furthermore, ath≥0.18, we observe a clear peak in the ε″ vs.Tcurve, that shifts towards lower temperatures upon increasing hydration; this shows that the activation enthalpy of the hydration water relaxation decreases with hydration. More in general, our data show that the technique of microwave cavity perturbation allows one to study the dynamics of water molecules in the hydration shell of proteins and to extend information obtained with dielectric techniques to the mw frequencies.

Microwave cavity perturbation technique: Part I: Principles

1993 ◽  
Vol 14 (12) ◽  
pp. 2423-2457 ◽  
Author(s):  
Olivier Klein ◽  
Steve Donovan ◽  
Martin Dressel ◽  
George Grüner
Keyword(s):  
Perturbation Technique ◽  
Microwave Cavity ◽  
Cavity Perturbation ◽  
Microwave Cavity Perturbation

Microwave cavity perturbation technique: Part II: Experimental scheme

1993 ◽  
Vol 14 (12) ◽  
pp. 2459-2487 ◽  
Author(s):  
Steve Donovan ◽  
Olivier Klein ◽  
Martin Dressel ◽  
Kàroly Holczer ◽  
George Grüner
Keyword(s):  
Perturbation Technique ◽  
Microwave Cavity ◽  
Experimental Scheme ◽  
Cavity Perturbation ◽  
Microwave Cavity Perturbation

scholarly journals Rapid, non-invasive characterization of the dispersity of emulsions via microwaves

2018 ◽  
Vol 9 (34) ◽  
pp. 6975-6980 ◽  
Author(s):  
Yuqiang Yan ◽  
Sergio Gonzalez-Cortes ◽  
Benzhen Yao ◽  
Daniel R. Slocombe ◽  
Adrian Porch ◽  
...  
Keyword(s):  
Perturbation Technique ◽  
New Method ◽  
Microwave Cavity ◽  
Non Invasive ◽  
Cavity Perturbation ◽  
Microwave Cavity Perturbation

Here we report an entirely new method for the non-intrusive interrogation and characterisation of emulsions based on the microwave cavity perturbation technique.

Microwave cavity perturbation technique for measurements of the quantum Hall effect

Cryogenics ◽  
2004 ◽  
Vol 44 (3) ◽  
pp. 183-186 ◽  
Author(s):  
V. Krasovitsky ◽  
D. Terasawa ◽  
K. Nakada ◽  
S. Kozumi ◽  
A. Sawada ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Perturbation Technique ◽  
Quantum Hall ◽  
Microwave Cavity ◽  
Cavity Perturbation ◽  
Microwave Cavity Perturbation
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