Title of article :
Field-gradient NMR diffusometry in poly(ethylene oxide) melts confined to nanoscopic pores of solid methacrylate matrices
Author/Authors :
Fischer، نويسنده , , Elmar and Beginn، نويسنده , , Uwe and Fatkullin، نويسنده , , Nail and Kimmich، نويسنده , , Rainer، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Abstract :
Depending on the choice of matrix constituents, the diameters of strands of linear, monodisperse poly(ethylene oxide) confined to nanoscopic pores of cross-linked methacrylate matrices can be varied considerably. The samples were characterized by DSC, TEM, SEM and fringe field-gradient NMR diffusometry with respect to the strand diameter. A formalism evaluating diffusive spin echo attenuation curves based on the tube/reptation model allows the determination of the strand diameter. Values in the range 8–58 nm were found in accordance with TEM and SEM micrographs of shadow-cast freeze-fractured surfaces of the samples.
Keywords :
Diffusometry , reptation , NMR , Poly(ethylene oxide) , Pore confinement
Journal title :
Magnetic Resonance Imaging
Journal title :
Magnetic Resonance Imaging