Five years operation of the second generation backscattering spectrometer IN16—a retrospective, recent developments and plans

Frick, B.; Ma, González

doi:10.1016/s0921-4526(01)00492-6

Cited by 73 publications

(61 citation statements)

References 62 publications

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“…30 Data have been collected at λ ) 6.27 Å, between 0.4 and 1.9 Å -1 . The sample was contained in an annular cylindrical cell with a sample thickness of 0.2 mm.…”

Section: Methodsmentioning

confidence: 99%

Quasi-Elastic Neutron Scattering Investigation of Dynamics in Polymer Electrolytes

et al. 2004

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Polymer dynamics in a cross-linked poly(ethylene oxide-propylene oxide) random copolymer, both neat and doped with an inorganic salt, is investigated by means of quasi-elastic neutron scattering (QENS) as a function of temperature and momentum transfer. Data from a high-resolution backscattering instrument are reported. We present an original approach to the analysis of inelastic fixed energy scans. The findings from this approach lead to a detailed description of the polymer dynamics across the glass transition. The neat polymer dynamics is modeled in terms of two relaxation processes: Below the glass transition, the methyl side group hopping relaxation has been characterized and compared with the similar process occurring in pure poly(propylene oxide). Above the glass transition, a non-Debye, non-Arrhenius relaxation occurs, corresponding to the polymer segmental dynamics. In the case of the salt-doped rubber, the segmental dynamics is found to be more complex: while the methyl group dynamics is not affected by the salt addition, the present data set supports the view of a bimodal segmental dynamics as a consequence of salt addition.

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“…30 Data have been collected at λ ) 6.27 Å, between 0.4 and 1.9 Å -1 . The sample was contained in an annular cylindrical cell with a sample thickness of 0.2 mm.…”

Section: Methodsmentioning

confidence: 99%

Quasi-Elastic Neutron Scattering Investigation of Dynamics in Polymer Electrolytes

et al. 2004

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“…19) at the Institute Laue-Langevin (ILL) in Grenoble. With a wavelength of 6.271 Å an energy resolution (full width at half maximum) of 0.9 μeV with a nearly Gaussian shape is achieved and a Q range from 0.2 to 1.9 Å −1 is covered.…”

Section: Backscattering Measurementsmentioning

confidence: 99%

Study of the structure and dynamics of poly(vinyl pyrrolidone) by molecular dynamics simulations validated by quasielastic neutron scattering and x-ray diffraction experiments

Busselez

Arbe

Álvarez

et al. 2011

The Journal of Chemical Physics

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Oxygen and nitrogen plasma hydrophilization and hydrophobic recovery of polymers Biomicrofluidics 6, 016501 (2012) Interferometric scanning microscopy for the study of disordered materials Appl. Phys. Lett. 99, 251912 (2011) (Electro)mechanical behavior of selectively solvated diblock/triblock copolymer blends Appl. Phys. Lett. 99, 242901 (2011) Statics of polymer droplets on deformable surfaces J. Chem. Phys. 135, 214703 (2011) Interactions between polymer brush-coated spherical nanoparticles: The good solvent case J. Chem. Phys. 135, 214902 (2011) Additional information on J. Chem. Phys. Quasielastic neutron scattering, x-ray diffraction measurements, and fully atomistic molecular dynamics simulations have been performed on poly(vinylpyrrolidone) homopolymer above its glass transition temperature. A "prepeak" appears in the x-ray diffraction pattern that shows the typical features of a first amorphous halo. From an effective description of the experimentally accessed incoherent scattering function of hydrogens in terms of a stretched exponential function, we observe enhanced stretching and a momentum-transfer dependence of the characteristic time different from that usually reported for more simple polymers (main-chain polymers or polymers with small side groups). The comparison with both kinds of experimental results has validated the simulations. The analysis of the simulated structure factor points to a nanosegregation of side groups (SG) and mainchains (MC). The detailed insight provided by the simulations on the atomic trajectories reveals a partial and spatially localized decoupling of MC and SG dynamics at length scales between the average SG-SG distance and the characteristic length of the backbone interchain correlations. Anomalous behavior in correlators calculated for the SG subsystem are found, like e.g., logarithmiclike decays of the density-density correlation function. They might be a consequence of the existing large dynamic asymmetry between SG and MC subsystems. Our results suggest that, as the SGs are spatially extended and chemically different from the backbone, they form transient nanosegregated domains. The dynamics of these domains show similar behavior to that found in other systems displaying large dynamic asymmetry.

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“…At physiological temperatures, using the relatively narrow dynamic range of the backscattering spectrometers IN10 [13] and IN16 [14] (ILL, Grenoble) (approximately −15 µeV < ω <+ 15 µeV in energy ω at a resolution of 0.9 µeV FWHM), it has been possible to reliably approximate the contribution from the D 2 O solvent as an apparent constant background. Furthermore, the contribution from the internal diffusive fluctuations of the proteins on the nanosecond time and nanometer length scale accessible by these high-resolution spectrometers a e-mail: seydel@ill.eu could be well described by a Lorentzian line shape with a fixed width not depending on the scattering vector q [8].…”

Section: Introductionmentioning

confidence: 99%

High-resolution neutron spectroscopy on protein solution samples

Grimaldo

Roosen-Runge²,

Jalarvo

et al. 2015

EPJ Web of Conferences

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Abstract. Proteins in solution move subject to a complex superposition of global translational and rotational diffusion as well as internal relaxations covering a wide range of time scales. With the advent of new high-flux neutron spectrometers in combination with enhanced analysis frameworks it has become possible to separate these different contributions. We discuss new approaches to the analysis by presenting example spectra and fits from data recorded on the backscattering spectrometers IN16, IN16B, and BASIS on the same protein solution sample. We illustrate the separation of the rotational and translational diffusion contribution, the accurate treatment of the solvent contribution, and the extraction of information on internal fluctuations. We also exemplify the progress made in passing from second-to third-generation backscattering spectrometers.

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Five years operation of the second generation backscattering spectrometer IN16—a retrospective, recent developments and plans

Cited by 73 publications

References 62 publications

Quasi-Elastic Neutron Scattering Investigation of Dynamics in Polymer Electrolytes

Quasi-Elastic Neutron Scattering Investigation of Dynamics in Polymer Electrolytes

Study of the structure and dynamics of poly(vinyl pyrrolidone) by molecular dynamics simulations validated by quasielastic neutron scattering and x-ray diffraction experiments

High-resolution neutron spectroscopy on protein solution samples

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