Study of asphaltene nanoaggregation by nuclear magnetic resonance (NMR) (Record no. 170172)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 01631nab a2200181 4500 |
| 008 - CÓDIGOS DE INFORMACIÓN DE LONGITUD FIJA - INFORMACIÓN GENERAL | |
| Campo de control de longitud fija | 260224s2009 xxu |
| 245 00 - TITULO | |
| Título | Study of asphaltene nanoaggregation by nuclear magnetic resonance (NMR) |
| 260 ## - PUBLICACION, DISTRIBUCION, ETC | |
| Lugar de publicación, distribución, etc. | |
| Nombre de publicador, distribuidor, etc. | |
| Fecha de publicación, distribución, etc. | mar./abr. 2009 |
| 270 ## - FECHA DE CARGA | |
| Fecha de carga | 2009-07-23 ; 2009-07-23 |
| 300 ## - DESCRIPCION FISICA | |
| Otra extensión | 5 p. ; 1189-1193 |
| 520 ## - RESUMEN, ETC | |
| Resumen | Resúmen del autor: The colloidal nature of asphaltenes impacts various physical properties of crude oils and exhibits a series of aggregation phenomena. Optical diffusion experiments at very low concentrations have measured the size of asphaltene monomers; ultrasound experiments have observed a nanoaggregation transition in toluene. In this work, we use a suite of nuclear magnetic resonance (NMR) methods to study the molecular dynamics and thermodynamics of aggregation in dilute asphaltene solutions. The molecular size of the single asphaltenes and aggregates is determined from NMR diffusion measurements. We observe an abrupt drop of the asphaltene diffusion constant at the onset of aggregation. We also measured the hydrogen index and observed a reduction in the spin-echo signal because of restricted motion of the alkyl chains upon aggregation. The enthalpy of aggregation is found to be negative, most likely because of p-stacking interactions. The entropy of aggregation is found to be positive, which is unexpected for a nonpolar solution. We also discuss the interpretation of these results. |
| 773 0# - CORRECCIÓN | |
| Título | Energy & fuels |
| Partes relacionadas | 23 |
| 942 ## - DESC. DE MATERIAL | |
| Tipo de item KOHA | Artículo de Revista |
| 100 1# - RESPONSABLE PERSONAL | |
| Apellido, Nombre | Lisitza, Natalia V. |
| 9 (RLIN) | 41540 |
| 650 #0 - MATERIA | |
| Término tópico | Asfaltenos |
| 9 (RLIN) | 20433 |
| Biblioteca propietaria | Biblioteca actual | Fecha de adquisición | Inventario | Total de préstamos | Inventario | Fecha de carga | Tipo de item KOHA |
|---|---|---|---|---|---|---|---|
| Biblioteca Alejandro Angel Bulgheroni | Biblioteca Alejandro Angel Bulgheroni | 05/03/2026 | 200044999 | 200044999 | 05/03/2026 | Artículo de Revista |
