Molecular Dynamics in Polymers

Kimmich, Rainer

doi:10.1007/978-94-007-5536-9_5

Cited by 4 publications

(2 citation statements)

References 95 publications

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“…However, the magnetic field range was relatively small and, more importantly, the T 1 dispersion measurements obtained were not consistent with theory and results from other studies. In particular, the NMRD profiles of fat and bone marrow showed positive slopes, which do not agree with experimentation on fatty tissues or theory 17 and, while Pulse sequence diagram of a fast field-cycling inversion-recovery pulse sequence. A polarisation period is included to generate magnetisation, which is inverted, after which the spin system is left to evolve at a selected evolution field before the NMR acquisition is made during the detection period using a radiofrequency coil tuned to a frequency appropriate to the detection field strength.…”

Section: Fast Field-cycling (Ffc) Is a Well-established Nuclear Magnecontrasting

confidence: 71%

A whole-body Fast Field-Cycling scanner for clinical molecular imaging studies

Broche

Ross

Davies

et al. 2019

Sci Rep

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Fast Field-Cycling (FFC) is a well-established Nuclear Magnetic Resonance (NMR) technique that exploits varying magnetic fields to quantify molecular motion over a wide range of time scales, providing rich structural information from nanometres to micrometres, non-invasively. Previous work demonstrated great potential for FFC-NMR biomarkers in medical applications; our research group has now ported this technology to medical imaging by designing a whole-body FFC Magnetic Resonance Imaging (FFC-MRI) scanner capable of performing accurate measurements non-invasively over the entire body, using signals from water and fat protons. This is a unique tool to explore new biomarkers related to disease-induced tissue remodelling. Our approach required making radical changes in the design, construction and control of MRI hardware so that the magnetic field is switched within 12.5 ms to reach any field strength from 50 μT to 0.2 T, providing clinically useful images within minutes. Pilot studies demonstrated endogenous field-dependant contrast in biological tissues in good agreement with reference data from other imaging modalities, confirming that our system can perform multiscale structural imaging of biological tissues, from nanometres to micrometres. It is now possible to confirm ex vivo results obtained from previous clinical studies, offering applications in diagnosis, staging and monitoring treatment for cancer, stroke, osteoarthritis and oedema.

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Section: Fast Field-cycling (Ffc) Is a Well-established Nuclear Magnecontrasting

confidence: 71%

A whole-body Fast Field-Cycling scanner for clinical molecular imaging studies

Broche

Ross

Davies

et al. 2019

Sci Rep

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“…The idea is to express the Kuhn segmental relaxation time τ 0 (Φ, T ) as functions of blend composition and temperature. Therefore, the reptation time for SAN in blend becomes …”

Section: Discussionmentioning

confidence: 99%

Simultaneous Slowdown of Segmental and Terminal Relaxation of Both Components in Dynamically Asymmetric Poly(ε-caprolactone)/Poly(styrene-co-acrylonitrile) Blends

Liu

Zhou

2018

Macromolecules

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The molecular relaxation of the dynamically asymmetric miscible polymer blend poly(styrene-co-acrylonitrile) (SAN)/poly(ε-caprolactone) (PCL) was investigated by differential scanning calorimetry, broadband dielectric spectroscopy, and rheological measurements. The relaxation times and the broadness of relaxation spectrum at both segmental scale and chain scale increase when the temperature decreases. The relaxation times at two length scales are linearly correlated, and the broadness of the terminal relaxation is wider than that of the segmental relaxation. Moreover, it is found that both the segmental relaxation time and the terminal relaxation time increase with the content of the counterpart at the same temperature distance from the effective glass transition temperature. It implies that segmental relaxation time at the effective glass transition temperature is composition-dependent due to the specific interactions between PCL and SAN. By combining the time-dependent diffusion double reptation (TDD-DR) model and the self-concentration and concentration-fluctuation (SCCF) model with the composition-dependent segmental relaxation time at the effective glass transition temperature, the linear viscoelasticity of SAN/ PCL blends can be well predicted over a wide range of compositions and temperatures.

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Adaptability of Polymer Molecular Coil Dimension in the Pore Structure of the Reservoir

Wang

Liu

et al. 2020

Chem Technol Fuels Oils

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Molecular Dynamics in Polymers

Cited by 4 publications

References 95 publications

A whole-body Fast Field-Cycling scanner for clinical molecular imaging studies

A whole-body Fast Field-Cycling scanner for clinical molecular imaging studies

Simultaneous Slowdown of Segmental and Terminal Relaxation of Both Components in Dynamically Asymmetric Poly(ε-caprolactone)/Poly(styrene-co-acrylonitrile) Blends

Adaptability of Polymer Molecular Coil Dimension in the Pore Structure of the Reservoir

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