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Improved dielectric model for polyvinyl alcohol-water hydrogel at microwave frequencies


Kok, Yeow You and Abbas, Zulkifly and Khalid, Kaida and Ab. Rahman, Mohamad Zaki (2010) Improved dielectric model for polyvinyl alcohol-water hydrogel at microwave frequencies. American Journal of Applied Sciences, 7 (2). pp. 270-276. ISSN 1546-9239; ESSN: 1554-3641


Problem statement: The study described rigorous dielectric modeling for Polyvinyl Alcohol (PVA)-water hydrogel mixture at microwave frequencies. Approach: A commercial openended coaxial sensor was used to measure the dielectric constant, loss factor and ionic conductivity, σ of PVA-water hydrogel mixture ranging concentration of 80-100% water content. Results: The sensor was operating between 0.13 and 20 GHz at and above of room temperature (25±1)°C. Indirectly, the relaxation time, τ, activation energy, Q and entropy change, ΔS of the hydrogel mixtures are determined based on linear fitting of measured data using Debye and Arrhenius approaches. Conclusion/Recommendations: Two main relaxation processes were found ranging 2-10 and 10-20 GHz, respectively. Dielectric dispersion is suggested to describe by combination of Cole-Davidson (CD) and Debye (Dy) processes. The results are discussed qualitatively based on bound states of water in hydrogel mixtures.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.3844/ajassp.2010.270.276
Publisher: Science Publications
Keywords: Dielectric constant; Loss factor; PVA-water hydrogel; Relaxation times
Depositing User: Najwani Amir Sariffudin
Date Deposited: 08 Nov 2013 06:42
Last Modified: 29 Nov 2017 07:47
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3844/ajassp.2010.270.276
URI: http://psasir.upm.edu.my/id/eprint/15136
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