Cross-over in the dynamics of polymer confined between two liquids of different viscosity

Giunta, G.; Carbone, Paola

doi:10.1098/rsfs.2018.0074

Cited by 6 publications

(4 citation statements)

References 42 publications

(53 reference statements)

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“…The inclusion of surface defects reduces further the value of β with the lowest value reached for the CGB sample. A common measure of the translation dynamics of polymer chains in a planar confinement is their central-bead meansquare-displacement (MSD) calculated in the plane parallel to the surface (xy) [33,34]:…”

Section: Cyan Line)mentioning

confidence: 99%

Multiscale modelling of heterogeneous fillers in polymer composites: the case of polyisoprene and carbon black

Giunta

Chiricotto

Jackson

et al. 2021

J. Phys.: Condens. Matter

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The dispersion of inorganic particles within polymeric materials is an extensively used method to enhance their mechanical properties. One of the major challenges in the simulation of polymer composites is to model the uneven surface of the fillers which strongly affects the dynamics of the adsorbed polymers and consequently the macroscopic mechanical properties of the final composite. Here we propose a new multiscale approach that, using experimental adsorption data, constructs the filler surface to statistically reproduce the surface defects. We use this approach to analyse the structure and dynamics of highly entangled polyisoprene melt in contact with different realistic carbon black samples. We show that the presence of the heterogeneous surface has a negligible influence on the structure of the polymer chains but a major effect on their dynamics and the surface wettability.

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Section: Cyan Line)mentioning

confidence: 99%

Multiscale modelling of heterogeneous fillers in polymer composites: the case of polyisoprene and carbon black

Giunta

Chiricotto

Jackson

et al. 2021

J. Phys.: Condens. Matter

Self Cite

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“…In addition to the change in the surface-free energy of the liquid–liquid interface due a portion of it being screened by the polymer molecule, the change in the free energy upon desorption depends on the change in the polymer interaction energy and conformational entropy when the molecule is moved from the interface into the bulk liquid. However, for the desorption from liquid–liquid interfaces, changes associated with the polymer conformational entropy represent only a small fraction of the total free energy of the system [ 42 ] and can, therefore, be safely neglected. Similarly, computer simulations indicate [ 43 ] that the contribution of the interaction energy of the polymer molecule with both the bulk cytoplasm, which is a poor solvent for RNA and DNA [ 44 ], and the interface can also be neglected.…”

Section: Discussionmentioning

confidence: 99%

Spontaneous Confinement of mRNA Molecules at Biomolecular Condensate Boundaries

Perelman,

Schmidt,

Khan

et al. 2023

Cells

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Cellular biomolecular condensates, termed ribonucleoprotein (RNP) granules, are often enriched in messenger RNA (mRNA) molecules relative to the surrounding cytoplasm. Yet, the spatial localization and diffusion of mRNAs in close proximity to phase separated RNP granules are not well understood. In this study, we performed single-molecule fluorescence imaging experiments of mRNAs in live cells in the presence of two types of RNP granules, stress granules (SGs) and processing bodies (PBs), which are distinct in their molecular composition and function. We developed a photobleaching- and noise-corrected colocalization imaging algorithm that was employed to determine the accurate positions of individual mRNAs relative to the granule’s boundaries. We found that mRNAs are often localized at granule boundaries, an observation consistent with recently published data. We suggest that mRNA molecules become spontaneously confined at the RNP granule boundary similar to the adsorption of polymer molecules at liquid–liquid interfaces, which is observed in various technological and biological processes. We also suggest that this confinement could be due to a combination of intermolecular interactions associated with, first, the screening of a portion of the RNP granule interface by the polymer and, second, electrostatic interactions due to a strong electric field induced by a Donnan potential generated across the thin interface.

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“…Liquid/liquid interfaces, as noted by Costa et al., can serve as a “factory floor” for the self-assembly of two-dimensional nanostructures, and nanoparticles in particular, because “[nanoparticle]s are driven [to interfaces] by a reduction of interfacial energy.” While the structure and dynamics of polymer topologies from linear to star − and ring , have been explored under many conditions (including in bulk solutions and at liquid/liquid interfaces ,− ) based on covalent bonding between monomers, comparatively little is known about the interfacial structure and dynamics of macromolecules that employ ”topological bonds” in addition to chemical bonds, i.e., mechanically interlocked molecules.…”

Section: Introductionmentioning

confidence: 99%

Structure and Thermodynamics of Linear, Ring, and Catenane Polymers in Solutions and at Liquid–Liquid Interfaces

et al. 2023

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In recent decades, advances in the syntheses of mechanically interlocked macromolecules, such as catenanes, have led to much greater interest in the applications of these complexes, from molecular motors and actuators to nanoscale computational memory and nanoswitches. Much remains to be understood, however, regarding how catenated ring compounds behave as a result of the effects of different solvents as well as the effects of solvent/solvent interfaces. In this work, we have investigated, using molecular dynamics simulations, the effects of solvation of poly(ethylene oxide) chains of different topologieslinear, ring, and [2]catenanein two solvents both considered favorable toward PEO (water, toluene) and at the water/toluene interface. Compared to ring and [2]catenane molecules, the linear PEO chain showed the largest increase in size at the water/toluene interface compared to bulk water or bulk toluene. Perhaps surprisingly, observations indicate that the tendency of all three topologies to extend at the water/toluene interface may have more to do with screening the interaction between the two solvents than with optimizing specific solvent–polymer contacts.

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Cross-over in the dynamics of polymer confined between two liquids of different viscosity

Cited by 6 publications

References 42 publications

Multiscale modelling of heterogeneous fillers in polymer composites: the case of polyisoprene and carbon black

Multiscale modelling of heterogeneous fillers in polymer composites: the case of polyisoprene and carbon black

Spontaneous Confinement of mRNA Molecules at Biomolecular Condensate Boundaries

Structure and Thermodynamics of Linear, Ring, and Catenane Polymers in Solutions and at Liquid–Liquid Interfaces

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