Theoretical investigations indicate that one can treat colloidal nanoparticles and nanosuspensions as Kerr medium in accordance with their resemblance to Kerr non-linearity (for example refer to: "Nonlinear optical dynamics in nonideal gases of interacting colloidal nanoparticles" by R. El-Ganainy, et.al). However, I doubt whether there is an experiment to investigate the external applied voltage (and consequently, the applied electric field) effect on refractive index changes in nanosuspensions. If yes, how can one apply voltage on the nanosuspension through the electrodes connected to the cell containing the nanosuspension?
http://10.1103/PhysRevA.80.053805
The type of nonlinearity of nanosuspensions is not Kerr actually, this is recognized in the article you cite and many others. As an example, 2D solitons can be induced in nanosuspensions, while they are not supported in a Kerr medium due to critical collapse.
As far as I know, there are no studies about the effect of an external applied voltage in nanosuspensions. If you are curious to do so, you could probably try using an empty liquid crystal cell (Thorlabs).
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