By Teh Fu Yen (auth.), Oliver C. Mullins, Eric Y. Sheu (eds.)
The investigative attack upon the enigmatic asphaltenes has lately ended in sig nificant advances in lots of different disciplines. Taken separately, each one self-discipline exposes convinced points of asphaltenes, yet every one, by myself, can by no means demonstrate asphaltenes from all van tages. Even likely narrowly concentrated matters reminiscent of the molecular constructions of asphal tenes, or the colloidal constructions of asphaltenes require a confluence of many strains of research to yield an realizing which differs from fact by way of diminishing uncer tainty. An holistic remedy of the asphaltenes is a strong method of evolve extra their realizing. for instance, exam of asphaltenes on the maximum solution yields molecular constitution. A mild bring up in scale probes asphaltene colloidal constitution. Weaving jointly asphaltene reports played at assorted size scales ends up in a cloth which envelops an encompassing imaginative and prescient of asphaltenes. whilst, the interfaces of those hierarchical reviews offer extra constraints on mind's eye, greater than investi gations at person size scales on my own. those issues formed the timing, structure, and the content material of our ebook. The editors are very appreciative of the diligence and tough paintings appear in all of the contributed chapters herein. We thank the contributing authors for making this undertaking a hit. Oliver C. Mullins Eric Y. Sheu vii CONTENTS I. Asphaltenes: kinds and resources ...................................... .
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Extra resources for Structures and Dynamics of Asphaltenes
For example, the spectra indicate that the hydrogen is substituted predominantly on saturated, not aromatic carbon. (The two-stretch overtone of aromatic CH, which occurs at -5980 cm-' , has roughly the same oscillator strength as the saturated CH per hydrogen, yet the aromatic overtone remains small even for asphaltenes). Nevertheless, in this Chapter, we are concerned primarily with the electronic transitions of aromatic hydrocarbons, so we will not discuss further these overtone and combination bands.
During the drilling of oil wells, rock cuttings are carried to the surface. One method to check whether an oil-bearing zone has been penetrated by the drill string, is to illuminate the rock cuttings with UV to check for visible fluorescence. In a similar manner, whole cores, or side-wall cores from oil wells are illuminated with UV to check for crude oil fluorescence. The intensity and color of the fluorescence are noted, and provide qualitative information about the oil saturation and oil type.
Inner shell electronic transitions are at much higher energies, corresponding to x-rays and are not of interest here. The 1t electrons in aromatic molecules are delocalized; the larger the aromatic molecule, the greater the delocalization. In accord with the principles of the quantum particle in a box, the greater extent of electronic delocalization, the lower energy the electronic transitions. For instance, the lowest allowed transition in benzene is at -260 nm; naphthalene (two rings), -290 nm; anthracene (three rings), -380 nm; and graphite (oo rings) is a zerobandgap semiconductor.
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