Anomalous electrical conductivity of nanoscale colloidal suspensions

Chakraborty, Suman ; Padhy, Sourav (2008) Anomalous electrical conductivity of nanoscale colloidal suspensions ACS Nano, 2 (10). pp. 2029-2036. ISSN 1936-0851

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The electrical conductivity of colloidal suspensions containing nanoscale conducting particles is nontrivially related to the particle volume fraction and the electrical double layer thickness. Classical electrochemical models, however, tend to grossly overpredict the pertinent effective electrical conductivity values, as compared to those obtained under experimental conditions. We attempt to address this discrepancy by appealing to the complex interconnection between the aggregation kinetics of the nanoscale particles and the electrodynamics within the double layer. In particular, we model the consequent alterations in the effective electrophoretic mobility values of the suspension by addressing the fundamentals of agglomeration−deagglomeration mechanisms through the pertinent variations in the effective particulate dimensions, solid fractions, as well as the equivalent suspension viscosity. The consequent alterations in the electrical conductivity values provide a substantially improved prediction of the corresponding experimental findings and explain the apparent anomalous behavior predicted by the classical theoretical postulates.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
Keywords:Agglomeration; Colloidal Suspension; Electrical Conductivity; Electrical Double Layer; Electrophoretic Mobility; Nanofluid
ID Code:100962
Deposited On:02 Jan 2017 08:56
Last Modified:02 Jan 2017 08:56

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