Critical exponents of gelation and conductivity in polyacrylamide gels doped by multiwalled carbon nanotubes

Demet Kaya Aktaş; Gülşen Akin Evingür; Önder Pekcan

doi:10.1163/092764410X495243

Critical exponents of gelation and conductivity in polyacrylamide gels doped by multiwalled carbon nanotubes

Demet Kaya Aktaş, Gülşen Akin Evingür, Önder Pekcan^*

^*Corresponding author for this work

Department of Physics Engineering

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

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 β 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.

Original language	English
Pages (from-to)	301-318
Number of pages	18
Journal	Composite Interfaces
Volume	17
Issue number	4
DOIs	https://doi.org/10.1163/092764410X495243
Publication status	Published - 1 May 2010

Keywords

Acrylamide
Critical phenomena
Fluorescence
Hydrogel
Multiwalled carbon nanotubes
Percolation

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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, tgel for PAM-MWNTs composite gels showed that the gel fraction exponent β 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.",

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AU - Aktaş, Demet Kaya

AU - Evingür, Gülşen Akin

AU - Pekcan, Önder

PY - 2010/5/1

Y1 - 2010/5/1

N2 - 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, tgel for PAM-MWNTs composite gels showed that the gel fraction exponent β 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.

AB - 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, tgel for PAM-MWNTs composite gels showed that the gel fraction exponent β 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.

KW - Acrylamide

KW - Critical phenomena

KW - Fluorescence

KW - Hydrogel

KW - Multiwalled carbon nanotubes

KW - Percolation

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Critical exponents of gelation and conductivity in polyacrylamide gels doped by multiwalled carbon nanotubes

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