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Use of Time Domain - NMR for the characterization of high viscosity organic systems

Grant number: 11/14099-3
Support Opportunities:Scholarships in Brazil - Post-Doctorate
Effective date (Start): November 01, 2011
Effective date (End): October 31, 2013
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Eduardo Ribeiro de Azevedo
Grantee:Fabiana Diuk de Andrade
Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil


The aim of this project is to develop a Nuclear Magnetic Resonance (NMR) approach with emphasis on time domain analysis to characterize dynamics and structural properties of different high viscosity organic systems with industrial interest: biopolymers gels and heavy oils. Although the two specific applications are quite different, the methodologies to be used in NMR studies are similar and/or complementary. Biopolymers gels are colloidal systems with solid character where the liquid phase is immobilized by a three-dimensional polymer network. NMR measurement such as T1, T2 and T1r relaxation, 1H multiple quantum and 1H spin diffusion will be used to investigate structural and dynamics properties in gels systems based on wheat gluten, that have unique viscoelastic properties of importance not only in food industry, but also in many other areas. The other study involves the effects of heavier compounds of petroleum, the asphaltenes, on their rheological properties such as viscosity. Asphaltenes are a complex mixture of compounds of various molecular weights and structures, including condensed aromatic rings with alkyl groups, heteroatms and metals. These compounds can affect oil production in all stages due to their tendency to aggregate, which causes increased viscosity and leads to significant economic losses. In this study, high resolution, relaxometry and multiple quantum NMR techniques will be used to study the composition and rheological properties such as viscosity of heavy oils, with particular emphasis on the rule played by asphaltenes. We seek for a correlation between the chemical composition, structural and dynamic properties on this systems.

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Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
CAROSIO, MARIA G. A.; BERNARDES, DIEGO F.; ANDRADE, FABIANA D.; MORAES, TIAGO B.; TOSIN, GIANCARLO; COLNAGO, LUIZ A.. Measuring thermal properties of oilseeds using time domain nuclear magnetic resonance spectroscopy. Journal of Food Engineering, v. 173, p. 143-149, . (12/20247-8, 11/14099-3, 09/09734-1)
CAROSIO, MARIA G. A.; BERNARDES, DIEGO F.; CARVALHO, ANDRE DE S.; COLNAGO, LUIZ A.. Non-invasive Measurements of Oilseed Temperature in Soil and Soil Thermal Diffusivity Using Time-Domain NMR Relaxometry. APPLIED MAGNETIC RESONANCE, v. 49, n. 10, p. 1119-1127, . (14/22126-9, 09/09734-1, 11/14099-3)
ANDRADE, FABIANA DIUK; NEWSON, WILLIAM R.; BERNARDINELLI, OIGRES DANIEL; RASHEED, FAIZA; COBO, MARCIO FERNANDO; PLIVELIC, TOMAS S.; DEAZEVEDO, EDUARDO RIBEIRO; KUKTAITE, RAMUNE. An insight into molecular motions and phase composition of gliadin/glutenin glycerol blends studied by C-13 solid-state and H-1 time-domain NMR. JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, v. 56, n. 9, p. 739-750, . (11/14099-3)
SILVA, LORENA M. A.; ANDRADE, FABIANA DIUK; FILHO, ELENILSON G. A.; MONTEIRO, MARCOS ROBERTO; DE AZEVEDO, EDUARDO RIBEIRO; VENANCIO, TIAGO. NMR investigation of commercial carbon black filled vulcanized natural rubber exposed to petrodiesel/biodiesel mixtures. FUEL, v. 186, p. 50-57, . (09/18354-8, 11/14099-3)

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