Results 121 to 130 of about 606 (146)

Excess water dynamics in hydrotalcite: QENS study

Pramana, 2004
Results of the quasi-elastic neutron scattering (QENS) measurements on the dynamics of excess water in hydrotalcite sample with varied content of excess water are reported. Translational motion of excess water can be best described by random translational jump diffusion model.
S. Mitra, A. Pramanik, D. Chakrabarty, R. Mukhopadhyay   +3 more
openaire   +1 more source

Water dynamics in Na zeolite P by QENS

Physica B: Condensed Matter, 1997
Abstract Quasi-elastic neutron-scattering (QENS) measurements have been made using the IRIS spectrometer (ISIS, UK) on water in synthetic Na zeolite P. The quasi-elastic broadening observed is assigned to a rotation of the water molecules.
P.D. Shepherd, W.W. Kagunya, S.I. Campbell, A.P. Chapple, J.W. Dreyer, R.J. Humphreys, M. Kemali, M. Mercer, D.K. Ross   +8 more
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QENS from “soft” systems: why use polarised neutrons?

Physica B: Condensed Matter, 2001
In recent years, there has been increased research in soft condensed matter. More complex systems, such as polymers, exhibit interesting dynamics over a wide temperature range and a broad time scale. In order to reproduce this behaviour, a combination of model scattering laws and the best possible measurements is necessary.
Barbara J. Gabrys, Wojciech Zajac, Otto Schärpf   +2 more
openaire   +1 more source

Order-disorder transition in pyridinium iodide: QENS study

Applied Physics A: Materials Science & Processing, 2002
Reorientational motion of the pyridinium cation in pyridinium iodide as studied by the high-resolution, quasi-elastic neutron scattering (QENS) technique both above and below the order–disorder transition (Tc=247 K) temperature are reported. The pyridinium ion is found to undergo reorientational motion around the axis perpendicular to its plane and is ...
R. Mukhopadhyay, S. Mitra, P.S. Kumar, I. Tsukushi, S. Ikeda   +4 more
openaire   +1 more source

Slow Dynamics in Liquid Metals as Seen by QENS

Zeitschrift für Physikalische Chemie, 2010
Abstract The quasielastic dynamics in liquid metals has been investigated by neutron scattering extensively during the past years. Precise measurements of the self-particle dynamics and the coherent quasielastic response provided conclusive evidence that the relaxation dynamics is governed by at least two processes. These two time scales
Franz Demmel, Spencer Howells, Christoph Morkel, W.-C. Pilgrim   +3 more
openaire   +1 more source

QENS/WINS Topical Discussions

Neutron News, 2021
Ross Stewart, Kristine Niss, Timmy Ramirez-Cuesta, Ken Herwig   +3 more
openaire   +1 more source

Diffusion motions in hydrated sodium alginate by QENS

AIP Conference Proceedings, 2010
QENS experiments are very suitable for the study of water‐polysaccharides systems both for slow polymer chains dynamics as well as for faster solvent molecules dynamics. By a suitable choice of experimental conditions as well as a properly data processing we can get information about the motion modes of various molecular groups of polymer chains in ...
V. Tripadus, J. M. Zanotti, M. Statescu, S. Mitra, D. Aranghel, M. Gugiu, M. Petre, I. Precup, Angelos Angelopoulos, Takis Fildisis   +9 more
openaire   +1 more source

Diffusive dynamics in trehalose aqueous solutions by QENS

Physica B: Condensed Matter, 2000
Abstract The work reports preliminary QENS results on aqueous solutions of trehalose. The employment of H/D substitution allows the separation of the diffusive dynamics of water from that of trehalose. The data analysis shows a slowed down water dynamics in comparison to that of bulk water.
MAGAZU', Salvatore, Lechner R. E., Longeville S., MAISANO, Giacomo, MAJOLINO, Domenico, MIGLIARDO, Placido, WANDERLINGH, Ulderico   +6 more
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A particle jumping in an octahedron studied by QENS

Physica B: Condensed Matter, 2000
Abstract We calculate the neutron incoherent scattering law due to a particle performing localized diffusional jumps in a confined environment of octahedral symmetry. An experimental realization for this model is provided by the fulleride Li12C60, where the Li ions diffuse within the octahedral void determined by the surrounding C60 spheres packed in
CRISTOFOLINI, Luigi, A. J. DIANOUX, P. DAMAY   +2 more
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QENS and quasielastic Mössbauer spectroscopy for studying diffusion

Physica B: Condensed Matter, 1996
QENS and quasielastic Mossbauer spectroscopy (QMS) are closely related in that both measure the double Fourier transform S(Q, ω) of the self-correlation function, which they deduce from scattering (QENS) and from resonant emission or absorption of nuclear γ radiation (QMS).
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