NMR Materials Studies...
Since the beginning of LEAR activities at the end of the 1980´s until today, several classes of materials were studied by high-resolution solid-state NMR methods, including polymers, ionic-conducting polymers, ionic-conducting organic-inorganic hybrid nanocomposites, conjugated polymers, block copolymers, polymer clay/MoS2 intercalation compounds, molecular sieves, soils, biomasses, among others.
In addition to NMR, several complementary techniques were employed, including small- and wide angle X-ray diffraction, conductivity and microscopy. In the mid-2000s, we started using Zero-Field NMR to study magnetic materials, especially intermetallic compounds, manganites, and FeV alloys. Almost at the same time, we started employing time-domain techniques to study fluid molecules migration in porous media, with main focus on petroleum reservoir rocks and similar geological formations, including sandstones and carbonates, as well as synthetic materials. For the study of all these porous materials, additional experimental techniques were used, including 3D x-ray microscopy, SEM, and basic petrophysics methods. Some interesting studies, especially those involving clay-coated sandstones, almost pure quartz-cemented Fontainebleau formations and synthetic porous media, have already been published. |