Rheological, dielectric and structural characterization of asphaltene suspensions under DC electric fields

Rejón, L.; Manero, Ο.; Lira-Galeana, C.

doi:10.1016/j.fuel.2003.09.009

Cited by 25 publications

(23 citation statements)

References 11 publications

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“…5d). This mechanism has been previously demonstrated by these and other authors (with different materials) in rheological studies performed on different ER suspensions [1,22,[31][32][33]. Now, there is another issue worth to consider: since the injection of charge is always present in ER fluids (this is required to explain the magnitude of the current density (∼µA cm −2 ) leaking through these suspensions [30]), one may wonder why is it possible to observe columns at low fields or, what is more important, why other materials can form chainlike arrangements even at high field strengths.…”

Section: Absorbance Changes and Fundamental Forcessupporting

confidence: 76%

Optical properties of dilute hematite/silicone oil suspensions under low electric fields

Espin

Delgado

Durán

2005

Journal of Colloid and Interface Science

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Section: Absorbance Changes and Fundamental Forcessupporting

confidence: 76%

Optical properties of dilute hematite/silicone oil suspensions under low electric fields

Espin

Delgado

Durán

2005

Journal of Colloid and Interface Science

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“…ELECTRORHEOLOGICAL studies facilitate predictive analysis in the field of engineering of materials under coupled mechanical and electrical stresses [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties and viscoelastic response in two-phase polymers

Mocellini

Lambri

Matteo

et al. 2008

IEEE Trans. Dielect. Electr. Insul.

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An electrorheological model is applied to results from Dynamic Mechanical Analysis in order to relate low-frequency dielectric properties to viscoelastic response. The model describes polymers with two phases at the mesoscopic scale, with polar groups embedded in one of the phases. Calculations use an electrorheological representation, based on the Voigt model, to describe the two phases. Low-frequency electrical and mechanical stresses are coupled through the permanent dipole moment of polar groups embedded in one of the phases. In the present model, low-frequency dielectric relaxation is calculated as the superposition of two Debye processes, corresponding to the interaction of the polar groups with the two phases. Induced polarization in the non-polar zones contributes only to highfrequency (relaxed) permittivity. The parameters of the relaxation processes are obtained from the electrorheological model using viscoelastic data from dynamic mechanical analysis. The model was applied to commercial EPDM (ethylene-propylene-diene monomer) employed as housing in electrical insulators rated at 33 kV. This rubber has two phases (amorphous and semi-crystalline), with polar groups embedded in the amorphous phase. Samples aged for 10 years in active transmission lines were studied, and compared with new samples. A good agreement was found between the calculated and measured dielectric spectra, within the low-frequency range where the model is applicable.

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“…The electric field application to colloidal suspensions generates a lot of interesting effects, which result in drastic changes of rheological, optical and electromagnetic properties of systems [1][2][3][4][5][6]. The external electric field polarizes the dispersed particles, enhances their attraction and aggregation [7][8][9], increases migration of the particles and the surrounding ions [10] and may cause deformation of the fluid particles [11].…”

Section: Introductionmentioning

confidence: 99%