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

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A B S T R A C T
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 0C), 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 0C), 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 0C), 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 0C), 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.

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Ketersediaan

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Informasi Detail

Judul Seri

CARBON

No. Panggil

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Penerbit

: Elsevier Ltd. All rights reserved., 2009

Deskripsi Fisik

C A R B ON x x x ( 2 0 0 9 ) x x x –x x x

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA KARBON

Info Detail Spesifik

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Pernyataan Tanggungjawab

yuli/agus

Versi lain/terkait

Lampiran Berkas

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