Determination of the Physical Properties of Oil Sands Components using Scanning Probe Microscopy
| Autor: | Tinu Abraham, Siddhartha Das, Aharnish Hande, Thomas Thundat, Ravi Gaikwad, Fatemeh Bakhtiari |
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| Rok vydání: | 2015 |
| Předmět: |
Kelvin probe force microscope
Scanning probe microscopy Differential scanning calorimetry Materials science Chemical physics Scanning confocal electron microscopy Analytical chemistry Scanning ion-conductance microscopy Scanning capacitance microscopy Vibrational analysis with scanning probe microscopy Asphaltene |
| Zdroj: | MRS Proceedings. 1754:69-74 |
| ISSN: | 1946-4274 0272-9172 |
| Popis: | Atomic force microscopy is employed to study the structural changes in the morphology and physical characteristics of asphaltene aggregates as a function of temperature. The exotic fractal structure obtained by evaporation-driven asphaltene aggregates shows an interesting dynamics for a large range of temperatures from 25°C to 80°C. The changes in the topography, surface potential and adhesion are unnoticeable until 70°C. However, a significant change in the dynamics and material properties is displayed in the range of 70°C - 80°C, during which the aspahltene aggregates acquire ‘liquid-like’ mobility and fuse together. This behaviour is attributed to the transition from the pure amorphous phase to a crystalline liquid phase which occurs at approximately 70°C as shown by using Differential Scanning Calorimetry (DSC). Additionally, the charged nature of asphaltenes and bitumen is also explored using kelvin probe microscopy. Such observations can lead to the development of a rational approach to the fundamental understanding of asphaltene aggregation dynamics and may help in devising novel techniques for the handling and separation of asphaltene aggregates using dielectrophoretic methods. |
| Databáze: | OpenAIRE |
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