High frequency poroelastic waves in hydrogels (Articolo in rivista)

Type
Label
  • High frequency poroelastic waves in hydrogels (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1121/1.3293000 (literal)
Alternative label
  • Piero Chiarelli; Antonio Lanatà; Marina Carbone; Claudio Domenici (2009)
    High frequency poroelastic waves in hydrogels
    in The Journal of the Acoustical Society of America
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Piero Chiarelli; Antonio Lanatà; Marina Carbone; Claudio Domenici (literal)
Pagina inizio
  • 1197 (literal)
Pagina fine
  • 1207 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 127 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 11 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR Institute of Clinical Physiology, via Moruzzi 1, 56124 Pisa, Italy Interdepartmental Research Center \"E. Piaggio,\" Faculty of Engineering, University of Pisa, via Diotisalvi 2, 56126 Pisa, Italy (literal)
Titolo
  • High frequency poroelastic waves in hydrogels (literal)
Abstract
  • In this work a continuum model for high frequency poroelastic longitudinal waves in hydrogels is presented. A viscoelastic force describing the interaction between the polymer network and the bounded water present in such materials is introduced. The model is tested by means of ultrasound wave speed and attenuation measurements in polyvinylalcohol hydrogel samples. The theory and experiments show that ultrasound attenuation decreases linearly with the increase in the water volume fraction ? of the hydrogel. The introduction of the viscoelastic force between the bounded water and the polymer network leads to a bi-phasic theory, showing an ultrasonic fast wave attenuation that can vary as a function of the frequency with a non-integer exponent in agreement with the experimental data in literature. When ? tends to 1 ?100% of interstitial water? due to the presence of bounded water in the hydrogel, the ultrasound phase velocity acquires higher value than that of pure water. The ultrasound speed gap at ? =1 is confirmed by the experimental results, showing that it increases in less cross-linked gel samples which own a higher concentration of bounded water. © 2010 Acoustical Society of America. (literal)
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