An acoustic dielectric and mechanical spectrometer

The Analyst
Ruifen HuChristopher R Lowe

Abstract

In this report, the dielectric constant of glycerol solutions (0-70% (w/w)) and the mechanical transitions of poly(2-hydroxylethyl methacrylate-co-methacrylic acid) films (600-800 nm, 1.5-10 mol% cross-linker) have been investigated by the magnetic acoustic resonance sensor (MARS), which is an electrode-free acoustic sensor and operates over a continuous frequency spectrum (6-200 MHz). When a glycerol solution was loaded, the response of the MARS decayed exponentially as the operating frequency was increased. The decay rate against frequency as a function of the glycerol concentration reflects the change of the dielectric property of the glycerol solutions. In addition, mechanical relaxation of the poly(2-hydroxylethyl methacrylate-co-methacrylic acid) film has been observed on the MARS and the corresponding viscoelastic transition frequency has been estimated. The viscoelastic transition frequency increased as the polymer was more highly cross-linked. The MARS system behaved as a dielectric and mechanical spectrometer, monitoring the electrical and mechanical properties of viscoelastic materials or on the solid-liquid interfaces simultaneously, which has prospective application in studies of biomaterials, molecular interaction...Continue Reading

References

May 1, 1995·Biomaterials·A R Khare, N A Peppas
Nov 17, 2001·Biomacromolecules·F HorkayP J Basser
Oct 8, 2003·The Analyst·A C StevensonC R Lowe
Nov 25, 2003·Analytical Chemistry·Alexander J MarshallChristopher R Lowe
Apr 22, 2006·The Journal of Chemical Physics·R BehrendsY Feldman
Jul 21, 2006·The Journal of Physical Chemistry. B·Alexander PuzenkoRalph Behrends
Jul 21, 2006·The Journal of Physical Chemistry. B·Yoshihito HayashiYuri Feldman

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