Zakład Fizyki Makromolekularnej
Strona główna


Makrocka-Rydzyk M., Głowinkowski S., Jurga S., Meyer W.H.

Molecular dynamics in stiff ionene below glass-transition Temperature dependences of proton and fluorine second moments and spin-lattice relaxation time T-1 below glass transition were measured in glassy ''I-Do,Pip-Me-BF4'' ionene. The existence of motions of methyl groups and segments linking the cationic centers, namely piperidinium rings and trimethylene groups, for the polymeric part of ionene were established. Isotropic rotation of the counter-ion was evidenced and its limited diffusion suggested. To interpret the proton and fluorine relaxation data, a Davidson-Cole distribution of correlation times was assumed.

Solid State Nuclear Magnetic Resonance, 4(6) , 353-360 (1995)

DOI: 10.1016/0926-2040(95)00013-G   (Pobrano:  aktualizowanie)


Andrew E.R., Kempka M.

Molecular motions in solid estradiol studied by nuclear magnetic resonance spectroscopy The temperature dependence of the proton nuclear magnetic resonance (NMR) relaxation time T-1 and second moment M(2) of polycrystalline beta-estradiol hemihydrate (1,3,5-estratriene-3,17 beta-diol) is measured at frequencies of 14 and 25 MHz. Below 260 K relaxation is found to be dominated by C-3 reorientation of the single methyl group in each molecule, characterized by an activation energy of 9.4+/-0.1 kJ/mol. Above 260 K another relaxation mechanism becomes evident, characterized by an activation energy of 22 +/- 2 kJ/mol and ascribed to motion of the water molecules in the solid.

Solid State Nuclear Magnetic Resonance, 4(4) , 249-253 (1995)

DOI: 10.1016/0926-2040(95)00003-9   (Pobrano:  aktualizowanie)


Suchański W., Peplińska B., Kempka M.

Magnetic relaxation and anisotropic molecular reorientation of liquid 3-acetylpyridine The nuclear spin-lattice relaxation times of C-13 and N-14 as well as the nuclear Overhauser enhancement factor have been measured as a function of temperature for liquid 3-acetylpyridine. Principal components of the relational diffusion tenser have been determined. The results are discussed in terms of relative influence of molecular shape and attractive dipolar forces on anisotropy of the molecular reorientations.

Berichte der Bunsengesellschaft/Physical Chemistry Chemical Physics, 99(4) , 595-599 (1995)

DOI: 10.1002/bbpc.19950990402   (Pobrano:  aktualizowanie)


Andrew E.R., Szcześniak E.

Low inductance transverse gradient system of restricted length A new transverse gradient coil assembly of restricted length is presented. The coil is symmetric, has the advantage of simplicity, generates a remarkably large volume of uniform transverse gradient field, features very low inductance, and can therefore be suitable for applications requiring fast switched gradients. A prototype coil has been constructed to check computer simulations and to compare measured parameters of the system with those expected. Coils of this type may be used for MRI of the human head, and of animals, and for NMR microimaging.

Magnetic Resonance Imaging, 13(4) , 607-613 (1995)

DOI: 10.1016/0730-725X(95)00002-X   (Pobrano:  aktualizowanie)


Andrew E.R., Szcześniak E.

A historical account of NMR in the solid state This article attempts to chronicle major milestones in the application of NMR in the solid state over the first 50 years since the discovery of NMR in 1945. After recording the earliest experiments with solids, we discuss in approximate chronological order the following topics: structure of solids, dynamics of solids including molecular reorientation, selfdiffusion and conformational motion, quadrupole effects, NQR, metals, negative temperatures, rotating frame temperatures, magnets and experimental methods, Fourier transform methods, magic angle spinning, multiple pulse NMR, CP/MAS, CRAMPS, double resonance, Overhauser effect, magnetic materials, ordered nuclear spin systems, phase transitions in solids, surfaces of solids, zero field NMR, 2D NMR, multiple quantum and overtone NMR in solids, NMR in high temperature superconductors, NMR in fullerenes, NMR imaging of solids, NMR force spectroscopy.

Progress in Nuclear Magnetic Resonance Spectroscopy, 28 , 11-36 (1995)

DOI: 10.1016/0079-6565(95)01018-1   (Pobrano:  aktualizowanie)

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