Better Resolved Dielectric Dispersions by the Apt Use of Kramers-Kronig Relations, Differential Operators, and All-In-1 Modeling

Research output: Chapter in Book/Conference proceedings/Edited volumeChapterScientificpeer-review

Abstract

The dielectric spectra of colloidal systems and other dielectric media often contain a typical low frequency dispersion, which usually remains unnoticed, because of the presence of strong conduction losses. The KK relations offer a means for converting ' into " data. This allows us to calculate conduction free " spectra in which the l.f. dispersion will show up undisturbed. This interconversion can be done on line with a moving frame of logarithmically spaced ' data. The coefficients of the conversion frames were obtained by kernel matching and by using symbolic differential operators. Logarithmic derivatives and differences of ' and " provide another option for conduction free data analysis. These difference-based functions actually derived from approximations to the distribution function, have the additional advantage of improving the resolution power of dielectric studies. A high resolution is important because of the rich relaxation structure of colloidal suspensions and most other dielectric media. The development of all-in-1 modeling facilitates the conduction free and high resolution data analysis. This mathematical tool allows the apart-together fitting of multiple data and multiple model functions. It proved also useful to go around the KK conversion altogether. This was achieved by the combined approximating ' and " data with a complex rational fractional power function. The all-in-1 minimization turned out to be also highly useful for the dielectric modeling of a suspension with the complex dipolar coefficient. It guarantees a secure correction for the electrode polarization, so that the modeling with the help of the differences ' and " can zoom in on the genuine colloidal relaxations.
Original languageEnglish
Title of host publicationCurrent Topics on Chemistry and Biochemistry
EditorsCharbell Miguel Haddad Kury
PublisherB P International
Chapter3
Pages40-82
Volume5
ISBN (Electronic)978-93-5547-856-6
ISBN (Print)978-93-5547-855-9
DOIs
Publication statusPublished - 2022

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • All-in-1modeling
  • electrode polarization
  • KK conversion frames
  • logarithmic derivatives and differences
  • matching Debye kernels
  • multivariate apart-together fitting
  • spectral resolution
  • symbolic differential operators

Fingerprint

Dive into the research topics of 'Better Resolved Dielectric Dispersions by the Apt Use of Kramers-Kronig Relations, Differential Operators, and All-In-1 Modeling'. Together they form a unique fingerprint.

Cite this