High-frequency rheology of a high viscosity silicone oil using diffusing wave spectroscopy

Z. Kokuti, K. van Gruijthuijsen, M. Jenei, G. Tóth-Molnár, A. Czirják, J. Kokavecz, P. Ailer, L. Palkovics, A. C. Völker, G. Szabó

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Measurements and modeling of rheological properties of a high viscosity silicone oil (polydimethylsiloxane, PDMS) at high frequency are reported. The linear viscoelastic properties are measured by small amplitude oscillation shear (SAOS) tests with a rotational rheometer. Furthermore, Diffusing Wave Spectroscopy (DWS) is used, which expands the angular frequency range of the measured loss and storage moduli up to 105 rad/s, in a temperature range of 20 - 70°C. Good agreement between both methods is found in the overlapping frequency region, especially at higher temperatures. The DWS data show that the elastic modulus stays dominant and increases with frequency, without a second cross-over point up till 108 rad/s. Flow curves, measured with rotational and with capillary rheometry up to a shear rate of 7.6 · 104 s-1, show shear thinning behavior, which implies nonlinear viscoelasticity. Comparison of the dynamic and complex viscosity shows that the Cox-Merz rule is valid in a frequency range spanning six orders of magnitude. A multi-element White-Metzner model is proposed as a constitutive equation, which accurately describes the nonlinear viscoelastic properties, including the decrease of the loss and storage moduli during amplitude sweeps in oscillatory shear measurements.

Original languageEnglish
Article number63984
JournalApplied Rheology
Volume24
Issue number6
DOIs
Publication statusPublished - 2014

Fingerprint

Silicone Oils
silicones
Rheology
rheology
Silicones
oils
Elastic moduli
Spectroscopy
Viscosity
viscosity
shear
frequency ranges
spectroscopy
rheometers
shear thinning
Shear thinning
Rheometers
viscoelasticity
Viscoelasticity
constitutive equations

Keywords

  • Cox-Merz rule
  • Diffusing Wave Spectroscopy
  • High frequency microrheology
  • PDMS
  • White-Metzner model

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)

Cite this

Kokuti, Z., van Gruijthuijsen, K., Jenei, M., Tóth-Molnár, G., Czirják, A., Kokavecz, J., ... Szabó, G. (2014). High-frequency rheology of a high viscosity silicone oil using diffusing wave spectroscopy. Applied Rheology, 24(6), [63984]. https://doi.org/10.3933/APPLRHEOL-24-63984

High-frequency rheology of a high viscosity silicone oil using diffusing wave spectroscopy. / Kokuti, Z.; van Gruijthuijsen, K.; Jenei, M.; Tóth-Molnár, G.; Czirják, A.; Kokavecz, J.; Ailer, P.; Palkovics, L.; Völker, A. C.; Szabó, G.

In: Applied Rheology, Vol. 24, No. 6, 63984, 2014.

Research output: Contribution to journalArticle

Kokuti, Z, van Gruijthuijsen, K, Jenei, M, Tóth-Molnár, G, Czirják, A, Kokavecz, J, Ailer, P, Palkovics, L, Völker, AC & Szabó, G 2014, 'High-frequency rheology of a high viscosity silicone oil using diffusing wave spectroscopy', Applied Rheology, vol. 24, no. 6, 63984. https://doi.org/10.3933/APPLRHEOL-24-63984
Kokuti, Z. ; van Gruijthuijsen, K. ; Jenei, M. ; Tóth-Molnár, G. ; Czirják, A. ; Kokavecz, J. ; Ailer, P. ; Palkovics, L. ; Völker, A. C. ; Szabó, G. / High-frequency rheology of a high viscosity silicone oil using diffusing wave spectroscopy. In: Applied Rheology. 2014 ; Vol. 24, No. 6.
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