Dielectric relaxation behavior of colloidal suspensions of palladium nanoparticle chains dispersed in PVP/EG solution

Chen, Zhen, Zhao, Kongshuang, Guo, Lin and Feng, Caihong (2007) Dielectric relaxation behavior of colloidal suspensions of palladium nanoparticle chains dispersed in PVP/EG solution. The Journal of Chemical Physics, 126 16: 164505.1-164505.8. doi:10.1063/1.2721561

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Author Chen, Zhen
Zhao, Kongshuang
Guo, Lin
Feng, Caihong
Title Dielectric relaxation behavior of colloidal suspensions of palladium nanoparticle chains dispersed in PVP/EG solution
Journal name The Journal of Chemical Physics   Check publisher's open access policy
ISSN 0021-9606
1089-7690
Publication date 2007-05
Sub-type Article (original research)
DOI 10.1063/1.2721561
Open Access Status File (Publisher version)
Volume 126
Issue 16
Start page 164505.1
End page 164505.8
Total pages 8
Place of publication College Park, MD United States
Publisher American Institute of Physics
Collection year 2007
Language eng
Formatted abstract
Dielectric measurements were carried out on colloidal suspensions of palladium nanoparticle chains dispersed in poly(vinyl pyrrolidone)/ethylene glycol (PVP/EG) solution with different particle volume fractions, and dielectric relaxation with relaxation time distribution and small relaxation amplitude was observed in the frequency range from 105 to 107 Hz. By means of the method based on logarithmic derivative of the dielectric constant and a numerical Kramers-Kronig transform method, two dielectric relaxations were confirmed and dielectric parameters were determined from the dielectric spectra. The dielectric parameters showed a strong dependence on the volume fraction of palladium nanoparticle chain. Through analyzing limiting conductivity at low frequency, the authors found the conductance percolation phenomenon of the suspensions, and the threshold volume fraction is about 0.18. It was concluded from analyzing the dielectric parameters that the high frequency dielectric relaxation results from interfacial polarization and the low frequency dielectric relaxation is a consequence of counterion polarization. They also found that the dispersion state of the palladium nanoparticle chain in PVP/EG solution is dependent on the particle volume fraction, and this may shed some light on a better application of this kind of materials.
Keyword Dielectric relaxation
Counterion polarization
Polyvinyl pyrrolidone
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
 
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Created: Thu, 21 Mar 2013, 12:26:51 EST by Zhen Chen on behalf of School of Civil Engineering