Electrorheology of Graphene Oxide

Abstract

Novel polarizable graphene oxide (GO) particles with oxidized groups on their edge and basal planes were prepared by a modified Hummers method, and their electro-responsive electrorheological (ER) characteristics when dispersed in silicone oil were examined with and without an electric field applied. The fibrillation phenomenon of this GO-based electro-responsive fluid was also observed via an optical microscope under an applied electric field. Both flow curves and dielectric spectra of the ER fluid were measured using a rotational rheometer and a LCR meter, respectively. Its viscoelastic properties of both storage and loss moduli were also examined using a vertical oscillation rheometer equipped with a high voltage generator, finding that the GO-based smart ER system behaves as a viscoelastic material under an applied electric field.

Ionic liquid-based organically modified silica for the development of new electrorheological fluids

“…These results are in agreement with the best ER response of the IL-ORMOSIL 2 -based suspension. graphene oxide [46], urea-modified silica particles [13], and also the silica particles containing ionic liquid physically confined within the silica particles [26][27]. Summarizing, the results presented in this work offer new opportunities for developing smart ER fluids with outstanding, rapid and reversible response without the problem of leaching the IL during the service life.…”

“…The formation of the internal structure in the ERF generally depends the interfacial polarization of constitutive particles [46]. Thus, dielectric constant (ε') and dielectric loss (ε") are important parameters for characterizing the ERF.…”

“…[48]. The solid curves in Figure 9 corresponed to the fit of the experimental data by the Cole-Cole model [46]:…”

Recent Progress in the Growth and Applications of Graphene as a Smart Material: A Review

“…Electrorheology (ER) material is a type of smart material where the rheological properties of the material can be reversibly transformed with the application of an external electric field (Zhang et al, 2010c(Zhang et al, , 2012Yin et al, 2012;Zhang and Choi, 2014). An ER material is composed of polarizable particles suspended in an insulating medium and after applying an electric field the particles are polarized and form a column like structure.…”

“…The resulting material showed adjustable electrical conductivity, which has potential for use as an ER material. Additionally, Zhang et al (2012) also prepared GO particles suspended in silicone oil, where the ER fluid is polarized and exhibits viscoelastic properties at various strains under an electric field. Yin et al (2012) prepared a novel ER suspension comprising of two dimensional PANI decorated GO sheets.…”