Structure and dynamics of graphite intercalation compounds. Part 3.—Crystal dynamics and binding in C8K, C8KH⅔ and C8KD⅔ by inelastic neutron scattering

1982 ◽  
Vol 78 (8) ◽  
pp. 2399 ◽  
Author(s):  
Timothy Trewern ◽  
Robert K. Thomas ◽  
John W. White
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Intercalation Compounds ◽  
Graphite Intercalation Compounds ◽  
Structure And Dynamics ◽  
Graphite Intercalation ◽  
Crystal Dynamics

Ti-Zr-Ni Quasicrystals: Structure and Hydrogen Storage

1995 ◽  
Vol 400 ◽  
Author(s):  
R. M. Stroud ◽  
A. M. Viano ◽  
E. H. Majzoub ◽  
P. C. Gibbons ◽  
K. F. Kelton
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Transition Metal ◽  
Hydrogen Storage ◽  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
X Ray ◽  
Structure And Dynamics ◽  
Icosahedral Phases

AbstractTitanium-based icosahedral phases constitute the second largest class of quasicrystals. In contrast with other Ti-based icosahedral phases (i-phases), Ti-Zr-Ni i-phases are well ordered and their formation is inhibited by the presence of Si and O, elements that stabilize the Ti-3d transition metal quasicrystals. We present x-ray and DSC data that suggest that Ti-Zr-Ni i-phases form a different class of titanium-based quasicrystals that are closely related to the MgZn2 Laves phase. The DSC data also suggest that the i-phase may be stable in these alloys. The ability of Ti-Zr-Ni i-phases to absorb up to 62 atomic % of hydrogen is presented and discussed. This opens new avenues of investigation of the structure and dynamics of quasiperiodic phases using elastic and inelastic neutron scattering and nuclear magnetic resonance and may point to potential uses for quasicrystals in hydrogen storage applications.

scholarly journals Concentration dependence of vibrational properties of bioprotectant/water mixtures by inelastic neutron scattering

2006 ◽  
Vol 4 (12) ◽  
pp. 167-173 ◽  
Author(s):  
S Magazù ◽  
F Migliardo ◽  
A.J Ramirez-Cuesta
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Biological Molecules ◽  
Chemical Mechanisms ◽  
Structure And Dynamics ◽  
Biophysical Processes ◽  
Bending Modes ◽  
Physical And Chemical ◽  
Vibrational Features

Neutron scattering has been demonstrated to be a powerful tool for characterizing the structure and dynamics of biological molecules and for investigating the physical and chemical mechanisms of biophysical processes. The aim of the present work is to investigate by inelastic neutron scattering (INS) the vibrational behaviour of a class of bioprotectant systems, such as homologous disaccharides, trehalose, maltose and sucrose, in water mixtures. INS measurements have been performed on trehalose/H 2 O, maltose/H 2 O and sucrose/H 2 O mixtures at very low temperature as a function of concentration by using the thermal original spectrometer with cylindrical analyzers (TOSCA) spectrometer at the ISIS Facility (DRAL, UK). The findings allow the analyses of the vibrational features of the INS spectra in order to study the effect of disaccharides on the H 2 O hydrogen-bonded tetrahedral network. The obtained neutron scattering findings point out that disaccharides, and in particular trehalose, have a destructuring effect on the water tetrahedral network, as emphasized by the analysis of the librational modes region from 50 to 130 meV energy transfer. On the other hand, the analysis of the bending modes region (130–225  meV) shows a locally ordered structure in the disaccharide/H 2 O mixtures. Finally, the observed experimental evidences are linked to the different bioprotective effectiveness of disaccharides as a function of concentration.

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