Inelastic neutron scattering experiments on the dynamics of a glass-forming material in mesoscopic confinement

Zorn, Reiner; Hartmann, Lutz; Frick, B.; Richter, D.; Kremer, Friedrich

doi:10.1016/s0022-3093(02)01485-0

Cited by 54 publications

(67 citation statements)

References 11 publications

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“…This is in fact not the case. Extreme stretching has also been reported e. g. for some glass-forming systems confined in nanopores, like salol [43] or different polymers [41], as well as for plasticizers [44] and in dynamically asymmetric systems, namely in mixtures of slow and fast spheres [46] and in miscible polymer blends [47]. For these dynamically asymmetric systems, a convex-concave crossover in the structure factor was also found [32,46,47].…”

Section: Structural Relaxation Of the Side Groupsmentioning

confidence: 76%

Nanophase Separation and Exotic Dynamic Behavior in Comb-Like Polymers

Arbe

2013

J. Phys. Soc. Jpn.

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We show the potential of neutron scattering combined with isotopic labeling to unravel structural and dynamical properties of 'comb-like' polymers. Results on homopolymers with alkyl side groups of varying length, namely on the families of poly(n-alkyl methacrylates) (PnMAs) and poly(alkylene oxides) (PAOs) are summarized. Diffraction experiments and fully atomistic molecular dynamics simulations evidence the formation of self-assembled nanodomains of the side groups surrounded by the main chains, independently of the nature of the latter. Neutron spin echo, time of flight and backscattering techniques were employed to investigate the collective dynamics relating inter-and intra-nanodomain correlations as well as the incoherent scattering function of hydrogens. The results are combined with other experimental techniques -dielectric spectroscopy and differential scanning calorimetry-to put into a context the dynamical processes identified. Plasticization and confinement effects arise in PnMAs, but not in the PAOs counterparts. The results point to the dynamic asymmetry developed in systems with intrinsic dynamic heterogeneities between the constituent parts as the key ingredient leading to the main features observed in PnMAs. This scenario is supported by coarsegrained simulations on generic comb-like polymers.

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Section: Structural Relaxation Of the Side Groupsmentioning

confidence: 76%

Nanophase Separation and Exotic Dynamic Behavior in Comb-Like Polymers

Arbe

2013

J. Phys. Soc. Jpn.

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“…The origin of the Bp and its relevance for the understanding of the glass transition is still debated. Therefore experimental results testing the change of the Bp as a function of parameters like pressure [42][43][44], molecular weight [45] or spatial confinement [46][47][48] are needed. The most pronounced influence of spatial confinement on the Bp is the reduction of low frequency modes below the Bp maximum.…”

Section: Glass Transition In Confinementmentioning

confidence: 99%

Inelastic neutron scattering for investigating the dynamics of confined glass-forming liquids

Frick

Alba‐Simionesco

Dosseh

et al. 2005

Journal of Non-Crystalline Solids

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“…Cyanobiphenyls (nCB) are liquid crystals which physicochemical properties have been extensively studied, partly because several members of this family can develop nematic 45 phases at room temperature, and enter the composition of displays, or electro-optic devices 6 . Within this series, 4-ncyano-4'-octylbiphenyl (8CB) holds a particular place, as it presents archetype isotropic to nematic and nematic to smectic A phase transitions.…”

mentioning

confidence: 99%

Incoherent quasielastic neutron scattering study of molecular dynamics of 4-n-octyl-4′-cyanobiphenyl

Lefort

Morineau

Guégan

et al. 2008

Phys. Chem. Chem. Phys.

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We report incoherent quasielastic neutron scattering experiments on the thermotropic liquid crystal 4-n-cyano-4'-octylbiphenyl. The combination of time-of-flight and backscattering data allows analyzing the intermediate scattering function over about three decades of relaxation times. Translational diffusion and uniaxial molecular rotations are clearly identified as the major relaxation processes in respectively the nanosecond and picosecond time scales. The comparison with literature data obtained by other techniques is discussed.

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Inelastic neutron scattering experiments on the dynamics of a glass-forming material in mesoscopic confinement

Cited by 54 publications

References 11 publications

Nanophase Separation and Exotic Dynamic Behavior in Comb-Like Polymers

Nanophase Separation and Exotic Dynamic Behavior in Comb-Like Polymers

Inelastic neutron scattering for investigating the dynamics of confined glass-forming liquids

Incoherent quasielastic neutron scattering study of molecular dynamics of 4-n-octyl-4′-cyanobiphenyl

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