Improved dielectric model for polyvinyl alcohol-water hydrogel at microwave frequencies
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 m...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Science Publications
2010
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| Online Access: | http://psasir.upm.edu.my/id/eprint/15136/ http://psasir.upm.edu.my/id/eprint/15136/1/ajassp.2010.270.276.pdf |
| _version_ | 1848842592831143936 |
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| author | Kok, Yeow You Abbas, Zulkifly Khalid, Kaida Ab. Rahman, Mohamad Zaki |
| author_facet | Kok, Yeow You Abbas, Zulkifly Khalid, Kaida Ab. Rahman, Mohamad Zaki |
| author_sort | Kok, Yeow You |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-15T08:01:35Z |
| format | Article |
| id | upm-15136 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T08:01:35Z |
| publishDate | 2010 |
| publisher | Science Publications |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-151362017-11-29T07:47:54Z http://psasir.upm.edu.my/id/eprint/15136/ Improved dielectric model for polyvinyl alcohol-water hydrogel at microwave frequencies Kok, Yeow You Abbas, Zulkifly Khalid, Kaida Ab. Rahman, Mohamad Zaki 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. Science Publications 2010 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/15136/1/ajassp.2010.270.276.pdf 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 http://www.thescipub.com/abstract/10.3844/ajassp.2010.270.276 10.3844/ajassp.2010.270.276 |
| spellingShingle | Kok, Yeow You Abbas, Zulkifly Khalid, Kaida Ab. Rahman, Mohamad Zaki Improved dielectric model for polyvinyl alcohol-water hydrogel at microwave frequencies |
| title | Improved dielectric model for polyvinyl alcohol-water hydrogel at microwave frequencies |
| title_full | Improved dielectric model for polyvinyl alcohol-water hydrogel at microwave frequencies |
| title_fullStr | Improved dielectric model for polyvinyl alcohol-water hydrogel at microwave frequencies |
| title_full_unstemmed | Improved dielectric model for polyvinyl alcohol-water hydrogel at microwave frequencies |
| title_short | Improved dielectric model for polyvinyl alcohol-water hydrogel at microwave frequencies |
| title_sort | improved dielectric model for polyvinyl alcohol-water hydrogel at microwave frequencies |
| url | http://psasir.upm.edu.my/id/eprint/15136/ http://psasir.upm.edu.my/id/eprint/15136/ http://psasir.upm.edu.my/id/eprint/15136/ http://psasir.upm.edu.my/id/eprint/15136/1/ajassp.2010.270.276.pdf |