The development of microwave absorber from oil palm shell carbon

A method for reducing palm shell residues has been investigated. Using pyrolysis technique, the residues are transformed into carbons, which are later used as a lossy elements in microwave absorber application. The microwave properties of permittivity,( e), loss tangent, (tan d) and absorption perfo...

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Main Author:	Yusof, Ahmad Anas
Format:	Thesis
Language:	English
Published:	2004
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/6086/1/AhmadAnasYusofMFKM2004.pdf
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id	my-utm-ep.6086
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spelling	my-utm-ep.60862018-09-19T05:03:17Z The development of microwave absorber from oil palm shell carbon 2004-09 Yusof, Ahmad Anas TJ Mechanical engineering and machinery A method for reducing palm shell residues has been investigated. Using pyrolysis technique, the residues are transformed into carbons, which are later used as a lossy elements in microwave absorber application. The microwave properties of permittivity,( e), loss tangent, (tan d) and absorption performance of microwave absorber utilizing palm shell carbon mixed with unsaturated polyester resin were studied in the microwave region of 8 to 12 GHz (X-band). The measurement of ( e) and (tan d) emphasize on the influence of carbon concentration (mass %) and pyrolysis temperature in the production of the carbon. It was found out that by increasing carbon pyrolysis temperature, an increase in ( e) and (tan d) had been observed. The increase of carbon concentration inside each measured sample also influenced the increase of ( e) and (tan d) condition. The optimum (tan d) was found by using 30% carbon pyrolysed at 800oC temperature, suggesting significant contribution in dielectric loss properties of the material. The preparation of microwave absorber by utilizing 30% mass concentration of palm shell carbon mixed with unsaturated polyester resin had been tested for microwave absorption. The amplitude of the absorption was relatively measured to a metal plate reference, which resulted in a various microwave absorption with respect to the thickness of the absorber. Moderate microwave absorption around - 10 dB was achieved for most samples within the same frequency band, with maximum absorption of - 30 dB for a thickness up to 75 mm. All the data indicates the possibility of using pyrolysed carbon derived from palm shell residues in providing an affordable solution for microwave technology as well as an alternative in managing the increase of the residues throughout the country 2004-09 Thesis http://eprints.utm.my/id/eprint/6086/ http://eprints.utm.my/id/eprint/6086/1/AhmadAnasYusofMFKM2004.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:61989 masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Yusof, Ahmad Anas The development of microwave absorber from oil palm shell carbon
description	A method for reducing palm shell residues has been investigated. Using pyrolysis technique, the residues are transformed into carbons, which are later used as a lossy elements in microwave absorber application. The microwave properties of permittivity,( e), loss tangent, (tan d) and absorption performance of microwave absorber utilizing palm shell carbon mixed with unsaturated polyester resin were studied in the microwave region of 8 to 12 GHz (X-band). The measurement of ( e) and (tan d) emphasize on the influence of carbon concentration (mass %) and pyrolysis temperature in the production of the carbon. It was found out that by increasing carbon pyrolysis temperature, an increase in ( e) and (tan d) had been observed. The increase of carbon concentration inside each measured sample also influenced the increase of ( e) and (tan d) condition. The optimum (tan d) was found by using 30% carbon pyrolysed at 800oC temperature, suggesting significant contribution in dielectric loss properties of the material. The preparation of microwave absorber by utilizing 30% mass concentration of palm shell carbon mixed with unsaturated polyester resin had been tested for microwave absorption. The amplitude of the absorption was relatively measured to a metal plate reference, which resulted in a various microwave absorption with respect to the thickness of the absorber. Moderate microwave absorption around - 10 dB was achieved for most samples within the same frequency band, with maximum absorption of - 30 dB for a thickness up to 75 mm. All the data indicates the possibility of using pyrolysed carbon derived from palm shell residues in providing an affordable solution for microwave technology as well as an alternative in managing the increase of the residues throughout the country
format	Thesis
qualification_level	Master's degree
author	Yusof, Ahmad Anas
author_facet	Yusof, Ahmad Anas
author_sort	Yusof, Ahmad Anas
title	The development of microwave absorber from oil palm shell carbon
title_short	The development of microwave absorber from oil palm shell carbon
title_full	The development of microwave absorber from oil palm shell carbon
title_fullStr	The development of microwave absorber from oil palm shell carbon
title_full_unstemmed	The development of microwave absorber from oil palm shell carbon
title_sort	development of microwave absorber from oil palm shell carbon
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2004
url	http://eprints.utm.my/id/eprint/6086/1/AhmadAnasYusofMFKM2004.pdf
_version_	1747814623493488640

The development of microwave absorber from oil palm shell carbon

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