Microwave dielectric characterization of hevea rubber latex at 2.6, 10 and 18 GHz
Dielectric properties of natural rubber Hevea brasiliensis latex were measured at frequencies 0.2 to 20 GHz, at temperatures of 2, 15, 25, 35, and 50°C and around 30-98% moisture content. Measurements were done using open-ended coaxial line sensor and automated network analyzer. As expected, results...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Universiti Putra Malaysia Press
2010
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| Online Access: | http://psasir.upm.edu.my/id/eprint/15635/1/17%20Pg%20121-138.pdf |
| _version_ | 1796968888114610176 |
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| author | Hassan, Jumiah Khalid, Kaida Wan Yusoff, Wan Mohamad Daud |
| author_facet | Hassan, Jumiah Khalid, Kaida Wan Yusoff, Wan Mohamad Daud |
| author_sort | Hassan, Jumiah |
| collection | UPM |
| description | Dielectric properties of natural rubber Hevea brasiliensis latex were measured at frequencies 0.2 to 20 GHz, at temperatures of 2, 15, 25, 35, and 50°C and around 30-98% moisture content. Measurements were done using open-ended coaxial line sensor and automated network analyzer. As expected, results showed that dielectric constant increased with increasing moisture. From 0.2 to 2.6 GHz, the losses were governed by conductive losses but for frequencies greater than 2.6 GHz, these were mainly due to dipolar losses. The former is due to conducting phases in hevea latex, while the latter is mainly governed by the orientation of water molecules. The results were analyzed at 2.6, 10, and 18 GHz, respectively. These were then compared with the values predicted by the dielectric mixture equations recommended by Weiner, Bruggeman and Kraszewski. All the measured values were found to be within the Weiner's boundaries and close to the upper limit of Weiner's model. It is also close to the predicted values of Bruggeman's model with a/b = 0.1. All the models including Kraszewski are suitable for predicting the dielectric properties of hevea latex for frequencies 2.6 to 18 GHz, moisture content 30 to 98% and temperatures 2 to 50°C. |
| first_indexed | 2024-03-06T07:34:55Z |
| format | Article |
| id | upm.eprints-15635 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T07:34:55Z |
| publishDate | 2010 |
| publisher | Universiti Putra Malaysia Press |
| record_format | dspace |
| spelling | upm.eprints-156352016-01-05T06:26:33Z http://psasir.upm.edu.my/id/eprint/15635/ Microwave dielectric characterization of hevea rubber latex at 2.6, 10 and 18 GHz Hassan, Jumiah Khalid, Kaida Wan Yusoff, Wan Mohamad Daud Dielectric properties of natural rubber Hevea brasiliensis latex were measured at frequencies 0.2 to 20 GHz, at temperatures of 2, 15, 25, 35, and 50°C and around 30-98% moisture content. Measurements were done using open-ended coaxial line sensor and automated network analyzer. As expected, results showed that dielectric constant increased with increasing moisture. From 0.2 to 2.6 GHz, the losses were governed by conductive losses but for frequencies greater than 2.6 GHz, these were mainly due to dipolar losses. The former is due to conducting phases in hevea latex, while the latter is mainly governed by the orientation of water molecules. The results were analyzed at 2.6, 10, and 18 GHz, respectively. These were then compared with the values predicted by the dielectric mixture equations recommended by Weiner, Bruggeman and Kraszewski. All the measured values were found to be within the Weiner's boundaries and close to the upper limit of Weiner's model. It is also close to the predicted values of Bruggeman's model with a/b = 0.1. All the models including Kraszewski are suitable for predicting the dielectric properties of hevea latex for frequencies 2.6 to 18 GHz, moisture content 30 to 98% and temperatures 2 to 50°C. Universiti Putra Malaysia Press 2010-01 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/15635/1/17%20Pg%20121-138.pdf Hassan, Jumiah and Khalid, Kaida and Wan Yusoff, Wan Mohamad Daud (2010) Microwave dielectric characterization of hevea rubber latex at 2.6, 10 and 18 GHz. Pertanika Journal of Science & Technology, 18 (1). pp. 121-138. ISSN 0128-7680; ESSN: 2231-8526 http://www.pertanika.upm.edu.my/Pertanika%20PAPERS/JST%20Vol.%2018%20%281%29%20Jan.%202010/17%20Pg%20121-138.pdf |
| spellingShingle | Hassan, Jumiah Khalid, Kaida Wan Yusoff, Wan Mohamad Daud Microwave dielectric characterization of hevea rubber latex at 2.6, 10 and 18 GHz |
| title | Microwave dielectric characterization of hevea rubber latex at 2.6, 10 and 18 GHz |
| title_full | Microwave dielectric characterization of hevea rubber latex at 2.6, 10 and 18 GHz |
| title_fullStr | Microwave dielectric characterization of hevea rubber latex at 2.6, 10 and 18 GHz |
| title_full_unstemmed | Microwave dielectric characterization of hevea rubber latex at 2.6, 10 and 18 GHz |
| title_short | Microwave dielectric characterization of hevea rubber latex at 2.6, 10 and 18 GHz |
| title_sort | microwave dielectric characterization of hevea rubber latex at 2 6 10 and 18 ghz |
| url | http://psasir.upm.edu.my/id/eprint/15635/1/17%20Pg%20121-138.pdf |
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