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Microstructure and dielectric properties of biocarbon nanofiber composites

A kind of web-like carbon with interconnected nanoribbons was fabricated using bacterial cellulose pyrolyzed at various temperatures, and the microwave dielectric properties were investigated. Bacterial cellulose was converted into carbonized bacterial cellulose (CBC) with a novel three-dimensional...

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Autores principales: Dai, Bo, Ren, Yong, Wang, Gaihua, Ma, Yongjun, Zhu, Pei, Li, Shirong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3695796/
https://www.ncbi.nlm.nih.gov/pubmed/23800353
http://dx.doi.org/10.1186/1556-276X-8-293
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author Dai, Bo
Ren, Yong
Wang, Gaihua
Ma, Yongjun
Zhu, Pei
Li, Shirong
author_facet Dai, Bo
Ren, Yong
Wang, Gaihua
Ma, Yongjun
Zhu, Pei
Li, Shirong
author_sort Dai, Bo
collection PubMed
description A kind of web-like carbon with interconnected nanoribbons was fabricated using bacterial cellulose pyrolyzed at various temperatures, and the microwave dielectric properties were investigated. Bacterial cellulose was converted into carbonized bacterial cellulose (CBC) with a novel three-dimensional web built of entangled and interconnected cellulose ribbons when the carbonization temperature was below 1,200°C; the web-like structure was destroyed at a temperature of 1,400°C. Composites of CBC impregnated with paraffin wax exhibited high complex permittivity over a frequency range of 2 to 18 GHz, depending on the carbonization temperature. Both real and imaginary parts were the highest for CBC pyrolyzed at 1,200°C. The complex permittivity also strongly depended on CBC loadings. For 7.5 wt.% loading, the real and imaginary permittivities were about 12 and 4.3, respectively, and the minimum reflection loss was -39 dB at 10.9 GHz. For 30 wt.% loading, the real and imaginary permittivities were about 45 and 80, respectively, and the shielding efficiency was more than 24 dB in the measured frequency range and could be up to 39 dB at 18 GHz. The electromagnetic properties were assumed to correlate with both the dielectric relaxation and the novel web-like structure.
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spelling pubmed-36957962013-07-01 Microstructure and dielectric properties of biocarbon nanofiber composites Dai, Bo Ren, Yong Wang, Gaihua Ma, Yongjun Zhu, Pei Li, Shirong Nanoscale Res Lett Nano Express A kind of web-like carbon with interconnected nanoribbons was fabricated using bacterial cellulose pyrolyzed at various temperatures, and the microwave dielectric properties were investigated. Bacterial cellulose was converted into carbonized bacterial cellulose (CBC) with a novel three-dimensional web built of entangled and interconnected cellulose ribbons when the carbonization temperature was below 1,200°C; the web-like structure was destroyed at a temperature of 1,400°C. Composites of CBC impregnated with paraffin wax exhibited high complex permittivity over a frequency range of 2 to 18 GHz, depending on the carbonization temperature. Both real and imaginary parts were the highest for CBC pyrolyzed at 1,200°C. The complex permittivity also strongly depended on CBC loadings. For 7.5 wt.% loading, the real and imaginary permittivities were about 12 and 4.3, respectively, and the minimum reflection loss was -39 dB at 10.9 GHz. For 30 wt.% loading, the real and imaginary permittivities were about 45 and 80, respectively, and the shielding efficiency was more than 24 dB in the measured frequency range and could be up to 39 dB at 18 GHz. The electromagnetic properties were assumed to correlate with both the dielectric relaxation and the novel web-like structure. Springer 2013-06-22 /pmc/articles/PMC3695796/ /pubmed/23800353 http://dx.doi.org/10.1186/1556-276X-8-293 Text en Copyright ©2013 Dai et al.; licensee Springer. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Nano Express
Dai, Bo
Ren, Yong
Wang, Gaihua
Ma, Yongjun
Zhu, Pei
Li, Shirong
Microstructure and dielectric properties of biocarbon nanofiber composites
title Microstructure and dielectric properties of biocarbon nanofiber composites
title_full Microstructure and dielectric properties of biocarbon nanofiber composites
title_fullStr Microstructure and dielectric properties of biocarbon nanofiber composites
title_full_unstemmed Microstructure and dielectric properties of biocarbon nanofiber composites
title_short Microstructure and dielectric properties of biocarbon nanofiber composites
title_sort microstructure and dielectric properties of biocarbon nanofiber composites
topic Nano Express
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3695796/
https://www.ncbi.nlm.nih.gov/pubmed/23800353
http://dx.doi.org/10.1186/1556-276X-8-293
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