Journal
FUEL
Volume 299, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.120872
Keywords
Asphaltene aggregation; Langmuir monolayer; Brewster angle microscopy; Reflection spectroscopy; Electronic microscopy
Categories
Funding
- Operative Programme FEDER-Andalucia (2014-2020, objective 1.2.2.) through Junta de Andalucia (CECEU) [A1122062E0, P12 FQM-2310AT17-5549]
- Ministry of Science and Innovation of Spain [PID2019-110430GB-C22, PID2019-105195RA-I00]
Ask authors/readers for more resources
This study provides a comprehensive experimental approach and structural analysis to reveal a two-step aggregation process of asphaltene at interfaces, showing that different aggregation states result in different intramolecular cohesion forces and interaction patterns.
Within this work we provide an extensive experimental approach comprised by pressure-area isotherms and optical studies at interfaces (by means of Brewster angle microscopy and reflection spectroscopy) combined with electronic microscopies and mass spectrometry examination of Langmuir-Blodgett films transferred from spreading concentrations above and below the nanoaggregate-to-cluster aggregation threshold. It will be shown that the associated structures already present in the bulk solutions are preserved upon transference to a large extent and primarily determine the subsequent asphaltene film structure at the interface. The different morphologies derived from each aggregation state reveals the intermolecular cohesion forces that are of short-range character in the nanoaggregate range, while the elongated rod-like structures, mainly observed for high spreading concentrations, indicates a longer order interaction responsible for the clusters formation at high molecular packing. These features provide new evidence of a two-step aggregation process at interfaces that, for this particular asphaltene sample, matches with that predicted by the modified Yen model.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available