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Changes in electrical and microstructural properties of microcrystalline cellulose as function of carbonization temperature

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Title: Changes in electrical and microstructural properties of microcrystalline cellulose as function of carbonization temperature
Authors: Rhim, Yo-Rhin1, Zhang, Dajie2, Fairbrother, D. Howard3, Wepasnick, Kevin A.3, Livi, Kenneth J.4, Bodnar, Robert J.5, Nagle, Dennis C.2 dnagle@jhu.edu
Source: Carbon. Apr2010, Vol. 48 Issue 4, p1012-1024. 13p.
Abstract: Abstract: AC and DC electrical measurements were made to better understand the thermal conversion of microcrystalline cellulose to carbon. This study identifies five regions of electrical conductivity that can be directly correlated to the chemical decomposition and microstructural evolution of cellulose during carbonization. In Region I (250–350°C), a decrease in overall AC conductivity occurs due to the loss of the polar oxygen-containing functional groups from cellulose molecules. In Region II (400–500°C), the AC conductivity starts to increase with heat treatment temperature due to the formation and growth of conducting carbon clusters. In Region III (550–600°C), a further increase of AC conductivity with increasing heat treatment temperature is observed. In addition, the AC conductivity demonstrates a non-linear frequency dependency due to electron hopping, interfacial polarization, and onset of a percolation threshold. In Region IV (610–1000°C), a frequency independent conductivity (DC conductivity) is observed and continues to increase with heat treatment due to the growth and further percolation of carbon clusters. Finally in Region V (1200–2000°C), the DC conductivity reaches a plateau with increasing heat treatment temperature as the system reaches a fully percolated state. [Copyright &y& Elsevier]
Copyright of Carbon is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 47951747
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  Data: Changes in electrical and microstructural properties of microcrystalline cellulose as function of carbonization temperature
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  Data: <searchLink fieldCode="JN" term="%22Carbon%22">Carbon</searchLink>. Apr2010, Vol. 48 Issue 4, p1012-1024. 13p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: AC and DC electrical measurements were made to better understand the thermal conversion of microcrystalline cellulose to carbon. This study identifies five regions of electrical conductivity that can be directly correlated to the chemical decomposition and microstructural evolution of cellulose during carbonization. In Region I (250–350°C), a decrease in overall AC conductivity occurs due to the loss of the polar oxygen-containing functional groups from cellulose molecules. In Region II (400–500°C), the AC conductivity starts to increase with heat treatment temperature due to the formation and growth of conducting carbon clusters. In Region III (550–600°C), a further increase of AC conductivity with increasing heat treatment temperature is observed. In addition, the AC conductivity demonstrates a non-linear frequency dependency due to electron hopping, interfacial polarization, and onset of a percolation threshold. In Region IV (610–1000°C), a frequency independent conductivity (DC conductivity) is observed and continues to increase with heat treatment due to the growth and further percolation of carbon clusters. Finally in Region V (1200–2000°C), the DC conductivity reaches a plateau with increasing heat treatment temperature as the system reaches a fully percolated state. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of Carbon is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.carbon.2009.11.020
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