New PDF release: Dynamics of Soft Matter: Neutron Applications

By Alexei P. Sokolov, Victoria García Sakai (auth.), Victoria García Sakai, Christiane Alba-Simionesco, Sow-Hsin Chen (eds.)

ISBN-10: 1461407265

ISBN-13: 9781461407263

ISBN-10: 1461407273

ISBN-13: 9781461407270

Dynamics of sentimental topic: Neutron Applications offers an summary of neutron scattering suggestions that degree temporal and spatial correlations concurrently, on the microscopic and/or mesoscopic scale. those strategies provide solutions to new questions bobbing up on the interface of physics, chemistry, and biology. wisdom of the dynamics at those degrees is important to realizing the smooth topic box, such as colloids, polymers, membranes, organic macromolecules, foams, emulsions in the direction of organic & biomimetic platforms, and phenomena concerning wetting, friction, adhesion, or microfluidics.

Emphasizing the complementarities of scattering strategies with different spectroscopic ones, this quantity additionally highlights the aptitude achieve in combining strategies equivalent to rheology, NMR, gentle scattering, dielectric spectroscopy, in addition to synchrotron radiation experiments. Key parts coated contain polymer technological know-how, organic fabrics, advanced fluids and floor science.

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Additional resources for Dynamics of Soft Matter: Neutron Applications

Sample text

Gabrys and T. 0 1 Momentum transfer [Å ] Fig. 14 Contamination of the EISF by coherent scattering – simulation for (A) instantaneous jumps of a proton over three equidistant and equivalent sites on a circle (CH3 group) and (B) rotational diffusion for the same geometrical atomic arrangements where β is the shape parameter and lies in the range 0 < β < 1. The fit was good and there were no problems reported with the EISF. The already mentioned RRDM [70] has also been used to account for the different rates of methyl group reorientation due to the different environments found in the amorphous polymeric state.

In practical terms, one sweeps the external magnetic field and records (in the reference field) the partially relaxed zcomponent of the nuclear magnetisation. The field-cycling technique adopted for methyl groups [55] has confirmed the existence of tunnel splitting between E and A symmetry species suspected of causing the T1 minimum at low temperatures [56]. The matching peak was subsequently observed by INS [57]. The results are shown in Fig. 12. This is due to the tunnel splitting hνt of reorienting methyl groups at low temperatures being such that νt falls in the MHz range for hindering barriers of several kJ mole−1 .

54 A [83]. Dashed lines are the values expected from the Bose factor intensity was observed at around Tg over the expected value. This excess scattering is attributed to the so-called fast process. Its characteristic time is 10−12 s and is a thermally activated process within the asymmetric double well potential. It is akin to the β process which is physically interpreted as a cage motion with the assistance of phonons. The onset temperature of the fast process is close to the Vogel–Fulcher temperature (VFT), which is ∼50 K below Tg , implying that the fast process is a precursor of the glass transition.

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Dynamics of Soft Matter: Neutron Applications by Alexei P. Sokolov, Victoria García Sakai (auth.), Victoria García Sakai, Christiane Alba-Simionesco, Sow-Hsin Chen (eds.)


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