Membranes studied using neutron scattering and NMR

1995 ◽  
Vol 73 (11-12) ◽  
pp. 687-696 ◽  
Author(s):  
Myer Bloom ◽  
Thomas M. Bayerl
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Neutron Scattering ◽  
Spectral Characteristics ◽  
Nmr Relaxation ◽  
Elastic Neutron ◽  
Fluid Membranes ◽  
Dynamical Properties ◽  
Elastic Neutron Scattering ◽  
Complementary Techniques

After reviewing some of the basic measurements that characterize the study of physical properties of matter using neutron scattering and nuclear magnetic resonance (NMR), connections between information obtained in current research on fluid membranes using these two complementary techniques are explored in two major chapters. In the first, the type of information on the structure of fluid membranes obtained from coherent elastic neutron scattering is compared with that from NMR spectral characteristics. Then, the type of information obtained on dynamical properties from NMR relaxation (T1 and T2) measurements is compared with that from quasi-elastic neutron scattering. Examples of such connections are given with an emphasis on relationships between the time and distance scales intrinsic to neutron scattering and NMR.

scholarly journals Water and Ion Dynamics in Confined Media: A Multi-Scale Study of the Clay/Water Interface

2021 ◽  
Vol 5 (2) ◽  
pp. 34
Author(s):  
Patrice Porion ◽  
Ali Asaad ◽  
Thomas Dabat ◽  
Baptiste Dazas ◽  
Alfred Delville ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Water Molecules ◽  
Bottom Up ◽  
Elastic Neutron ◽  
Multi Scale ◽  
Dynamical Properties ◽  
Nuclear Magnetic

This review details a large panel of experimental studies (Inelastic Neutron Scattering, Quasi-Elastic Neutron Scattering, Nuclear Magnetic Resonance relaxometry, Pulsed-Gradient Spin-Echo attenuation, Nuclear Magnetic Resonance Imaging, macroscopic diffusion experiments) used recently to probe, over a large distribution of characteristic times (from pico-second up to days), the dynamical properties of water molecules and neutralizing cations diffusing within clay/water interfacial media. The purpose of this review is not to describe these various experimental methods in detail but, rather, to investigate the specific dynamical information obtained by each of them concerning these clay/water interfacial media. In addition, this review also illustrates the various numerical methods (quantum Density Functional Theory, classical Molecular Dynamics, Brownian Dynamics, macroscopic differential equations) used to interpret these various experimental data by analyzing the corresponding multi-scale dynamical processes. The purpose of this multi-scale study is to perform a bottom-up analysis of the dynamical properties of confined ions and water molecules, by using complementary experimental and numerical studies covering a broad range of diffusion times (between pico-seconds up to days) and corresponding diffusion lengths (between Angstroms and centimeters). In the context of such a bottom-up approach, the numerical modeling of the dynamical properties of the diffusing probes is based on experimental or numerical investigations performed on a smaller scale, thus avoiding the use of empirical or fitted parameters.

Quasi-elastic neutron scattering study on polymorphism of tristearin: relationship between dynamical properties and subcell structures

2005 ◽  
Vol 275 (1-2) ◽  
pp. e2187-e2193 ◽  
Author(s):  
Chikayo Akita ◽  
Tatsuya Kawaguchi ◽  
Fumitoshi Kaneko ◽  
Osamu Yamamuro ◽  
Hiroyuki Akita ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Elastic Neutron ◽  
Scattering Study ◽  
Dynamical Properties ◽  
Elastic Neutron Scattering ◽  
Neutron Scattering Study

scholarly journals Fragility of Bioprotectant Glass-Forming Systems in Extremophiles

2009 ◽  
Vol 2009 ◽  
pp. 1-9
Author(s):  
S. Magazù ◽  
F. Migliardo
Keyword(s):  
Glass Transition ◽  
Neutron Scattering ◽  
Functional State ◽  
Extreme Conditions ◽  
Dynamical Transition ◽  
Elastic Neutron ◽  
Glass Forming ◽  
Dynamical Regimes ◽  
Dynamical Properties ◽  
Elastic Neutron Scattering

A central issue in the adaptation of proteins and enzymes to extreme conditions is the conservation of their functional state, which is characterized by a well-balanced compromise of stability and flexibility. In this review work an overview of elastic neutron scattering (ENS) findings on a class of bioprotectant glass-forming systems, such as trehalose and its homologous (maltose and sucrose) water mixtures, is presented as a function of temperature and concentration. ENS, in fact, allows to determine some remarkable quantities in order to characterize the correlation among dynamical properties, the flexibility and fragility of biomolecules. The experimental results have pointed out a dynamical transition, which shows a crossover in molecular fluctuations between harmonic and anharmonic dynamical regimes. The ENS findings allow to characterize both the trehalose rigidity and flexibility, which are strictly connected to its superior bioprotective effectiveness. In this frame the lowest flexibility and fragility character of trehalose/H2O mixture with respect to maltose and sucrose/H2O mixtures indicate a better attitude to encapsulate biostructures in more rigid and temperature insensitive structures in approaching the glass transition.

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