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

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Critical Exponents of Gelation and Conductivity in Polyacrylamide Gels Doped by Multiwalled Carbon Nanotubes.pdf (637.3Kb)
Date
2010
Author
Aktas, Demet Kaya
Evingür, Gülşen Akin
Pekcan, Önder
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

Source

Composite Interfaces

Issue

4

Volume

17

Pages

301-318

URI

https://hdl.handle.net/20.500.12469/1062
https://dx.doi.org/10.1163/092764410X495243

Collections

  • Araştırma Çıktıları / Scopus [1319]
  • Araştırma Çıktıları / WOS [1335]
  • Biyoinformatik ve Genetik / Bioinformatics and Genetics [212]

Keywords

Acrylamide
Multiwalled carbon nanotubes
Hydrogel
Percolation
Critical phenomena
Fluorescence

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