A Time Domain Reflectometer for Dielectric Relaxation Spectroscopy of Electrolyte Solutions

1997 ◽  
Vol 101 (10) ◽  
pp. 1509-1516 ◽  
Author(s):  
R. Buchner ◽  
J. Barthel
Keyword(s):  
Dielectric Relaxation ◽  
Time Domain ◽  
Electrolyte Solutions ◽  
Dielectric Relaxation Spectroscopy ◽  
Time Domain Reflectometer

What can be learnt from dielectric relaxation spectroscopy about ion solvation and association?

2008 ◽  
Vol 80 (6) ◽  
pp. 1239-1252 ◽  
Author(s):  
Richard Buchner
Keyword(s):  
Dielectric Relaxation ◽  
Ion Association ◽  
Electrolyte Solutions ◽  
Ion Solvation ◽  
Dielectric Relaxation Spectroscopy ◽  
Major Focus ◽  
Solvent Interactions ◽  
Solution Studies ◽  
Key Features ◽  
Thermodynamics And Dynamics

Ion solvation and ion association are key features of ion-solvent interactions, and their balance largely determines structure, thermodynamics, and dynamics of electrolyte solutions. Despite being studied for many years with various techniques, these effects are still intriguing because too often results obtained with different methods-each having its individual merits and limitations-cannot be connected properly due to lacking information. In this contribution, we would like to bring dielectric relaxation spectroscopy (DRS) as a further tool for solution studies to the attention of the audience. The principles of DRS and the required instrumentation are briefly introduced. The major focus will be on the kind of results obtained with this technique regarding ion solvation and association and how this information compares with results obtained from other techniques.

Dielectric relaxation spectroscopy of electrolyte solutions. Recent developments and prospects

1998 ◽  
Vol 78 (1-2) ◽  
pp. 83-109 ◽  
Author(s):  
J. Barthel ◽  
R. Buchner ◽  
P.-N. Eberspächer ◽  
M. Münsterer ◽  
J. Stauber ◽  
...  
Keyword(s):  
Dielectric Relaxation ◽  
Electrolyte Solutions ◽  
Dielectric Relaxation Spectroscopy ◽  
Recent Developments

scholarly journals Dielectric relaxation spectroscopy: an old-but-new technique for the investigation of electrolyte solutions

2020 ◽  
Vol 92 (10) ◽  
pp. 1595-1609 ◽  
Author(s):  
Glenn Hefter ◽  
Richard Buchner
Keyword(s):  
Dielectric Relaxation ◽  
Ion Pairs ◽  
Hydrophobic Hydration ◽  
Ion Association ◽  
Electrolyte Solutions ◽  
Dielectric Constants ◽  
Spectroscopic Techniques ◽  
Dielectric Relaxation Spectroscopy ◽  
Low Dielectric ◽  
Unique Ability

AbstractThe use of dielectric relaxation spectroscopy (DRS) for studying electrolyte solutions is reviewed, focussing on the authors’ investigations over the last three decades. It is shown that this often-overlooked technique provides powerful insights into the nature of ion-ion and ion-solvent interactions. DRS is revealed to be particularly useful for detection of weak ion association and, due to its unique ability to detect solvent-separated species, the quantitation of ion pairing. It is demonstrated that DRS correctly determines chemical speciation for ion-paired systems where major spectroscopic techniques (NMR, Raman, UV-vis) fail. DRS also provides important insights into ion solvation. In aqueous solutions, it has been used to build up a coherent set of ‘effective’ hydration numbers for ions based on the dynamics of proximate water molecules, and has a unique ability to detect ‘slow’ water resulting from hydrophilic and hydrophobic hydration of solutes. DRS has been especially useful for characterising the behaviour of ionic liquids (ILs), e.g. showing they possess rather low dielectric constants and, surprisingly, contain no significant concentrations of ion pairs. Neat ILs and their mixtures with molecular solvents are shown by ultra-broadband DRS to exhibit extremely complicated behaviour especially at frequencies in the THz region.

Dielectric Relaxation Spectroscopy of Electrolyte Solutions: ZnCl2 in N-Methyl-2-pyrrolidone

1991 ◽  
Vol 46 (10) ◽  
pp. 920-922
Author(s):  
◽  
A. Steffen ◽  
M. Stockhausen
Keyword(s):  
Dielectric Relaxation ◽  
Complex Permittivity ◽  
Electrolyte Solutions ◽  
Ionic Species ◽  
Dielectric Relaxation Spectroscopy ◽  
Solution System ◽  
Lower Frequencies

AbstractThe complex permittivity of the title solution system (c≤1.5 mol/1) was measured at frequencies ranging up to 72 GHz at 20 °C. Apart from the conductivity contribution there are two distinguishable relaxation regions, which are ascribed to the solvent (at higher frequencies) and to solvated ionic species (at lower frequencies).

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