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2586103 
Journal Article 
Enhanced dc conductivity of low volume-fraction nano-particulate suspensions in silicone and perfluorinated oils 
Wilson, SA; Libor, Z; Skordos, AA; Zhang, Q 
2009 
Yes 
Journal of Physics D: Applied Physics
ISSN: 0022-3727
EISSN: 1361-6463 
42 
6 
WOS:000263824200004 
The dc conductivities of several different types of nanoparticles (nickel, barium titanate and magnetite) suspended in both silicone and perfluorinated oils have been measured and contrasted. Enhanced dc conductivity through interaction between the particles and the fluid has been demonstrated, even at quite moderate fields, and different types of nanoparticles have been shown to exhibit different behavioural trends. Whilst the dc enhancement is partly related to the concentration (or spatial arrangement) of the particles as expected, there is clear evidence that energy-activated (electric field activated) processes also play a major role. It can be said that effective-medium theories based solely on the electrical properties and volume fractions of the component materials have limited applicability when assessing the dc conductivities of these nanoparticle-fluid combinations at low volume fractions.