The nuclear magnetic relaxation dispersion (NMRD) technique consists of measurement of
the magnetic-field dependence of the longitudinal nuclear-spin-lattice relaxation rate 1/T 1 …

Asphaltenes, as the heaviest and most polar fraction of petroleum, have been characterized
by various analytical techniques. A variety of fractionation methods have been carried out to …

In recent years, the hybrid thermal-solvent process has been widely applied to improve the
recovery performance of steam injection processes in heavy oil reservoirs. In this paper, the …

Petroporphyrins, geoporphyrins, or metalloporphyrins are the original petroleum biomarkers,
identified by Alfred Treibs more than a century ago and the first molecular evidence for the …

Determination of the molecular structures of petroporphyrins has been crucial to understand
the diagenetic pathways and maturation of petroleum. However, these studies have been …

Asphaltene aggregation is a subject under vivid discussion: There are several parameters
one needs to determine before its behavior can be mastered and better target solutions can …

The work demonstrates the great potential of using a vanadyl porphyrin probe to study resin–
paraffin aggregation processes in oils. The dynamics and polarity of the local environment of …

Petroleum is still the most important energy source globally and essential to daily human
activities. Its exploration in deep waters and the logistics-related operations present the risk …

The use of vanadyl porphyrins either in synthetic compounds or naturally occurring in
asphaltenes is investigated as a source of proton hyperpolarization via dynamic nuclear …

In recent years, the dominant organizing role of non-covalent π-stacking interactions in the
association of asphaltenes and porphyrins was criticized and replaced with cooperative …