Conductivity of Asphaltenes

Fotland, Per; Anfindsen, Hilde

doi:10.1007/978-1-4899-1615-0_8

Cited by 13 publications

(24 citation statements)

References 18 publications

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“…The electrical charge is thought to arise as a consequence of the high degree of electron delocalization due to the graphite-like stacking of the molecules, giving an overall negative charge [71,44]. In consequence, asphaltenes micelles may behave like ions in solution [70,75].…”

Section: Asphaltenesmentioning

confidence: 99%

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The colloidal structure of bitumen: Consequences on the rheology and on the mechanisms of bitumen modification

Lesueur¹

2009

Advances in Colloid and Interface Science

1,247

710

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Section: Asphaltenesmentioning

confidence: 99%

“…Also, asphaltenes carry permanent electrical charges [70,71] and their dielectric constant lies between 5 and 7 [72,73,74]. The electrical charge is thought to arise as a consequence of the high degree of electron delocalization due to the graphite-like stacking of the molecules, giving an overall negative charge [71,44].…”

Section: Asphaltenesmentioning

confidence: 99%

The colloidal structure of bitumen: Consequences on the rheology and on the mechanisms of bitumen modification

Lesueur¹

2009

Advances in Colloid and Interface Science

1,247

710

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“…Asphaltene aggregation is still maintained in solvent, where they associate to form the so-called "micelles" [14,[32][33][34][35] whose size is principally determined by the solvent nature, asphaltene content, and temperature [28,29,35]. Asphaltene graphite-like stacking of the molecules has as consequences a high degree of electron delocalization, giving an overall negative charge [27,36] a permanent electrical charge [37], and a dielectric constant between 5 and 7 [38][39][40]. Finally, asphaltene association also has particular effects on the rheological behavior of bitumen [41][42][43].…”

Section: Asphaltenesmentioning

confidence: 99%

Bitumen and Bitumen Modification: A Review on Latest Advances

et al. 2019

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This synthesis explores the state-of-the-knowledge and state-of-the-practice regarding the latest updates on polymer-modified bitumens (PmBs). The information in this study was gathered from a thorough review of the latest papers in the literatures related to modified bituminous materials, technologies, and advances. For this purpose, the paper is presented in two principle sections. In the first part, the bitumen itself is investigated in terms of chemical structure and microstructural systems. In the second part, the paper focuses on bitumen modification from different aspects for assessing the effectiveness of the introduced additives and polymers for enhancing the engineering properties of bitumen in both paving and industrial applications. In conclusion, the knowledge obtained in this study has revealed the importance of the chemical composition of base bitumen for its modification. It can be declared that while some polymers/additives can improve one or some aspects of neat bitumen properties, they can lead to compatibility problems in storage and production. In this respect, several studies showed the effectiveness of waxes for improving the compatibility of polymers with bitumen in addition to some benefits regarding warm mix asphalt (WMA) production.

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“…18−20 Dielectric constant measurement is typically carried out using parallel plate capacitors, with the polar molecules placed in the space between the capacitor plates. 21 The electrical charge stored in the capacitor, when placed in an external electric field, generates an internal electric field in the opposite direction, to reduce the net or effective voltage across the capacitor plates. Higher-polarity substances will generate a greater internal electric field opposing the external field and reduce the capacitance to a larger extent, thereby establishing a direct relationship with the dipole moment.…”

Section: ■ Introductionmentioning

confidence: 99%

Stability Determination of Asphaltenes through Dielectric Constant Measurements of Polar Oil Fractions

Punase

Hasçakir

2016

Energy Fuels

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Asphaltenes represent the heaviest and the most polar fraction of crude oil. The interaction of asphaltenes with other fractions of crude oil can affect its overall polarity and stability. Because of the complex nature of the molecules constituting asphaltenes, determining the polarity of asphaltenesand, thereby, predicting their stabilityis, however, difficult. A more practical way to estimate asphaltenes instability would have important implications in predicting oil production performance. In this study, we present a method of combining dielectric constant measurements of crude oil fractions with a modified effective medium approximation to estimate the instability of asphaltenes. Furthermore, we show that the dielectric constant of resins fractions comprising mainly organic constituents with minimum impurities provide the best representation of crude oils, with regard to physical properties such as density and viscosity. Two new analytical correlations relating the overall dielectric constant of crude oil mixtures and their constituents are suggested. These correlations provide insight toward the stability of asphaltenes with crude oil and can be directly used to estimate the overall precipitation tendency of asphaltenes.

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Conductivity of Asphaltenes

Cited by 13 publications

References 18 publications

The colloidal structure of bitumen: Consequences on the rheology and on the mechanisms of bitumen modification

The colloidal structure of bitumen: Consequences on the rheology and on the mechanisms of bitumen modification

Bitumen and Bitumen Modification: A Review on Latest Advances

Stability Determination of Asphaltenes through Dielectric Constant Measurements of Polar Oil Fractions

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