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 open- ended coaxial sensor was used to measure the dielectric constant, loss factor and ionic conductivity, s of PVA-water hydrogel...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Science Publications
2010
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| Online Access: | http://eprints.utm.my/26161/1/YouKokYeow2010_ImprovedDielectricModelforPolyvinylAlcoholWater.pdf |
| _version_ | 1796856153214287872 |
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| author | You, Kok Yeow Z., Abbas K., Khalid M. Z. A., Rahman |
| author_facet | You, Kok Yeow Z., Abbas K., Khalid M. Z. A., Rahman |
| author_sort | You, Kok Yeow |
| collection | ePrints |
| description | Problem statement: The study described rigorous dielectric modeling for Polyvinyl Alcohol (PVA)-water hydrogel mixture at microwave frequencies. Approach: A commercial open- ended coaxial sensor was used to measure the dielectric constant, loss factor and ionic conductivity, s 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, t, activation energy, Q and entropy change, ?S 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 | 2024-03-05T18:39:14Z |
| format | Article |
| id | utm.eprints-26161 |
| institution | Universiti Teknologi Malaysia - ePrints |
| language | English |
| last_indexed | 2024-03-05T18:39:14Z |
| publishDate | 2010 |
| publisher | Science Publications |
| record_format | dspace |
| spelling | utm.eprints-261612018-11-30T06:23:04Z http://eprints.utm.my/26161/ Improved dielectric model for polyvinyl alcohol-water hydrogel at microwave frequencies You, Kok Yeow Z., Abbas K., Khalid M. Z. A., Rahman TK Electrical engineering. Electronics Nuclear engineering Problem statement: The study described rigorous dielectric modeling for Polyvinyl Alcohol (PVA)-water hydrogel mixture at microwave frequencies. Approach: A commercial open- ended coaxial sensor was used to measure the dielectric constant, loss factor and ionic conductivity, s 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, t, activation energy, Q and entropy change, ?S 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://eprints.utm.my/26161/1/YouKokYeow2010_ImprovedDielectricModelforPolyvinylAlcoholWater.pdf You, Kok Yeow and Z., Abbas and K., Khalid and M. Z. A., Rahman (2010) Improved dielectric model for polyvinyl alcohol-water hydrogel at microwave frequencies. American Journal of Applied Sciences, 7 (2). 270 -276. ISSN 1546-9239 https://www.thescipub.com/abstract/10.3844/ajassp.2010.270.276 |
| spellingShingle | TK Electrical engineering. Electronics Nuclear engineering You, Kok Yeow Z., Abbas K., Khalid M. Z. A., Rahman 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 |
| topic | TK Electrical engineering. Electronics Nuclear engineering |
| url | http://eprints.utm.my/26161/1/YouKokYeow2010_ImprovedDielectricModelforPolyvinylAlcoholWater.pdf |
| work_keys_str_mv | AT youkokyeow improveddielectricmodelforpolyvinylalcoholwaterhydrogelatmicrowavefrequencies AT zabbas improveddielectricmodelforpolyvinylalcoholwaterhydrogelatmicrowavefrequencies AT kkhalid improveddielectricmodelforpolyvinylalcoholwaterhydrogelatmicrowavefrequencies AT mzarahman improveddielectricmodelforpolyvinylalcoholwaterhydrogelatmicrowavefrequencies |