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Michaela ZAMPONI (Forschungszentrum Jülich)Oral
The dynamics of short unentangled tracer chains in the melt of a highly entangled polymer matrix has been investigated using neutron spin echo spectroscopy [Zamponi et al., Phys. Rev. Lett. 126, 187801 (2021)]. Irrespective of the tracer chain length, the center of mass mean square displacement is subdiffusive at short times and crosses over to Fickian diffusion at longer times. The diffusion...
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Jack ROOKS (University of Delaware)Oral
Polymer Nanocomposites (PNC) can enhance the mechanical properties over the host polymer. Greater understanding of their microstructure and dynamics is needed to effectively design PNC with improved characteristics. A model system of well-dispersed elongated silica nanoparticles in strongly adsorbed poly(ethylene oxide) is used to investigate the shape effects of nanoparticles with comparison...
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Ingo HOFFMANN (ILL)Poster
The Zilman-Granek (ZG) stretched exponential [1] has been widely used to describe neutron spin echo (NSE) data from undulating membranes for more than 2 decades.
However, with the abilities of modern NSE spectrometers, it becomes necessary to go beyond the stretched exponential approximation.Recently, we have published an expression for the dynamic structure factor of undulating vesicles,...
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Dieter RICHTER (Forschungszentrum Jülich)Oral
We have investigated the dynamics of polyethylene-oxide (PEO) ring/linear blends of various molecular weight ratios. Both the blend viscosity as well as the microscopic dynamics were studied. The blend viscosity displays a maximum at intermediate ring volume fractions. For symmetric blends the relative viscosity maximum increases with the molecular weight of the polymers, while for...
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Paulina SZYMONIAK (Bundesanstalt für Materialforschung und –prüfung (BAM))Invited
Vitrimers are redefining the boundaries between thermosets and thermoplastics by combining permanent network integrity with true recyclability enabled by dynamic covalent chemistry. Yet, the key question remains: how does molecular mobility at the smallest length and time scales translate into macroscopic reprocessability? In this work, we unravel this connection through a multiscale dynamics...
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Daria NOFERINIPoster
Gels with tailored confining and release properties of solvents are essential tools for cleaning sensitive precious artefacts. Understanding thoroughly the transport phenomena at the molecular level in these systems is crucial for improving formulations, not only for cultural heritage conservation but also for applications such as drug delivery. To this end, we used QENS to probe the...
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Margarita KRUTEVA (Forschungszentrum Jülich)Poster
The research on Non-Gaussian (NG) dynamics in polymer melts has been largely focused on the decaging of polymer segments near the glass transition and was quantified in terms of the NG parameter. Recently, based on simulations, theoretical investigations led to quantitative determination of the NG parameter for the linear entangled polymers. We present a study on diffusion of short...
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Mr Firoz MALAYIL KALATHIL (PostDoc Researcher)Poster
Surfactant-free microemulsions (SFME) are an emerging class of self-organized ternary liquids that develop mesoscale structure without conventional surfactants. Understanding their phase behavior and dynamics is crucial for applications in drug delivery, extraction, and chemical engineering.
In ternary mixtures, SFME formation arises from a delicate interplay of molecular architecture,...
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Dr Armin MOZHDEHEI (Institute of Physics of Rennes, CNRS-University of Rennes)Poster
Understanding water diffusion in subnanometer pores is essential for designing next-generation proton-conducting materials. Sulfonated porous aromatic frameworks (SPAFs) offer a unique platform for this by combining rigid, permanently microporous carbon scaffolds with adjustable -SO3H densities. Their high proton conductivities, often comparable to fluorinated polymers, indicate that...
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Aastha TEJASVI (Department of Physics and Astronomy, Uppsala University)Oral
Polymeric fluids are one of the most fascinating areas in soft matter physics. Entangled polymer systems exhibit complex, non-Newtonian viscoelastic behaviour arising from topological constraints that restrict chain motion. These entanglements result in characteristic plateau moduli and long relaxation times. To directly access molecular relaxation under shear, we used an updated cone–plate...
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Benedetta ROSI (European Spallation Source)Oral
In recent years, a great effort has been put to investigate collective relaxations in liquids [1] and polymer systems [2] at mesoscopic scales. This has been experimentally achieved using neutron scattering methods, especially in combination with polarization analysis (PA) capabilities [3] allowing to disentangle incoherent and coherent contributions, or with computational methods [4]. Few...
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Christian BECK (ESS DMSC)Poster
Neutron spectroscopy offers a unique access to diffusive properties of molecules on the nanosecond time scale. Next to structural properties, diffusive properties are also relevant for molecular interactions. In recent years, the interest in the investigation of kinetically evolving samples has been continuously increasing. While for other neutron scattering techniques, time-resolved...
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