25 research outputs found

    Molecular simulation of surface-modified polymer vesicle designed for gene and drug delivery

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    āđ‚āļ„āļĢāļ‡āļāļēāļĢāļŦāļ™āļķāđˆāļ‡āļ­āļēāļˆāļēāļĢāļĒāđŒāļŦāļ™āļķāđˆāļ‡āļœāļĨāļ‡āļēāļ™ āļ›āļĢāļ°āļˆāļģāļ›āļĩ 254

    Mechanical Properties of Glassy Polyethylene Nanofibers via Molecular Dynamics Simulations

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    The extent to which the intrinsic mechanical properties of polymer fibers depend on physical size has been a matter of dispute that is relevant to most nanofiber applications. Here, we report the elastic and plastic properties determined from molecular dynamics simulations of amorphous, glassy polymer nanofibers with diameter ranging from 3.7 to 17.7 nm. We find that, for a given temperature, the Young’s elastic modulus E decreases with fiber radius and can be as much as 52% lower than that of the corresponding bulk material. Poisson’s ratio Î― of the polymer comprising these nanofibers was found to decrease from a value of 0.3 to 0.1 with decreasing fiber radius. Our findings also indicate that a small but finite stress exists on the simulated nanofibers prior to elongation, attributable to surface tension. When strained uniaxially up to a tensile strain of Îĩ = 0.2 over the range of strain rates and temperatures considered, the nanofibers exhibit a yield stress σy between 40 and 72 MPa, which is not strongly dependent on fiber radius; this yield stress is approximately half that of the same polyethylene simulated in the amorphous bulk.DuPont MIT AllianceDuPont (Firm) (Young Professor Award

    Molecular simulation of surface-modified polymer vesicle designed for gene and drug delivery: monte carlo simulations of grafted polymers between two walls

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    āđ‚āļ„āļĢāļ‡āļāļēāļĢāļŦāļ™āļķāđˆāļ‡āļ­āļēāļˆāļēāļĢāļĒāđŒāļŦāļ™āļķāđˆāļ‡āļœāļĨāļ‡āļēāļ™ āļ›āļĢāļ°āļˆāļģāļ›āļĩ 254

    Monte carlo simulation of bidisperse melt polymer brushes

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    āđ‚āļ„āļĢāļ‡āļāļēāļĢāļŦāļ™āļķāđˆāļ‡āļ­āļēāļˆāļēāļĢāļĒāđŒāļŦāļ™āļķāđˆāļ‡āļœāļĨāļ‡āļēāļ™ āļ›āļĢāļ°āļˆāļģāļ›āļĩ 254

    Computational molecular modeling of polymer solid electrolytes II: multiscale molecular modeling of amorphous polyethylene oxide

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    āđ‚āļ„āļĢāļ‡āļāļēāļĢāļŦāļ™āļķāđˆāļ‡āļ­āļēāļˆāļēāļĢāļĒāđŒāļŦāļ™āļķāđˆāļ‡āļœāļĨāļ‡āļēāļ™ āļ›āļĢāļ°āļˆāļģāļ›āļĩ 254

    Computational molecular modeling of chitin and chitosan

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    āđ‚āļ„āļĢāļ‡āļāļēāļĢāļŦāļ™āļķāđˆāļ‡āļ­āļēāļˆāļēāļĢāļĒāđŒāļŦāļ™āļķāđˆāļ‡āļœāļĨāļ‡āļēāļ™ āļ›āļĢāļ°āļˆāļģāļ›āļĩ 254

    Solid polymer electrolytes based on nanocomposites of polyethylene oxide/sodium thiocyanate/montmorillonite, respectively

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    āđ‚āļ„āļĢāļ‡āļāļēāļĢāļŦāļ™āļķāđˆāļ‡āļ­āļēāļˆāļēāļĢāļĒāđŒāļŦāļ™āļķāđˆāļ‡āļœāļĨāļ‡āļēāļ™ āļ›āļĢāļ°āļˆāļģāļ›āļĩ 254

    Structure formation in the crystallization and annealing of tetracontane nanoparticles

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    āļœāļĨāļ‡āļēāļ™āļ§āļīāļŠāļēāļāļēāļĢāļ„āļ“āļēāļˆāļēāļĢāļĒāđŒāļĄāļŦāļēāļ§āļīāļ—āļĒāļēāļĨāļąāļĒāđ€āļ—āļ„āđ‚āļ™āđ‚āļĨāļĒāļĩāļŠāļļāļĢāļ™āļēāļĢ

    Nanostructure of the interface modified by grafted polymers: a monte carlo simulation

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