Critical Exponents of Gelation and Conductivity in Polyacrylamide Gels Doped by Multiwalled Carbon Nanotubes

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Date

2010

Authors

Aktas, Demet Kaya
Evingür, Gülşen Akin
Pekcan, Önder

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Taylor & Francis Ltd

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Abstract

Polyacrylamide (PAM) doped by multiwalled carbon nanotube (MWNT) gels were prepared with different amounts of MWNTs varying in the range between 0.1 and 15 wt%. The PAM-MWNT composite gels were characterized by the steady state fluorescence technique (SSF). The alternative electrical conductivity (AC) of PAM-MWNT composite gels was measured by the dielectric spectroscopy technique. Observations around the gel point t(gel) for PAM-MWNTs composite gels showed that the gel fraction exponent beta obeyed the percolation result. The critical exponent r of AC electrical conductivity for the composite PAM-MWNT gel was also measured and found to be about 2.0 which agrees with a random resistor network. (C) Koninklijke Brill NV Leiden 2010

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Acrylamide, Multiwalled carbon nanotubes, Hydrogel, Percolation, Critical phenomena, Fluorescence

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22

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Scopus Q

Q2

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Volume

17

Issue

4

Start Page

301

End Page

318