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• W2064122173 abstract "Twist solitons are important topological defects in the crystalline and rotator phases of normal alkanes and polyethylene (PE). They facilitate molecular motion along the stem axis in crystalline lamellae, as well as molecular rotation in rotator phases RI and RII. Here, we determine the conformation, formation energy, mobility, and fluctuation free energy of twist solitons in n-alkanes and PE by a combination of techniques, including all-atom simulations and analytical/numerical calculations. We find the soliton formation energy to be about 15 kT for the crystal, 4 kT for RI, and only about kT in the RII phase. We model stochastic transport of solitons across a PE crystalline lamella, and compute a jump rate for stems at 350 K of 30 000 s−1, comparable to NMR results; in the RI phase of C23 n-alkanes, we predict a jump rate of 1.5 × 1010s−1, comparable to molecular dynamics (MD) observations. We calculate corrections due to twist fluctuations, which reduce the soliton free energy by of order kT. Thus the RII phase should be regarded as a phase in which molecules twist freely with essentially no barrier." @default.
• W2064122173 created "2016-06-24" @default.
• W2064122173 creator A5039412874 @default.
• W2064122173 creator A5081102204 @default.
• W2064122173 date "2011-01-01" @default.
• W2064122173 modified "2023-10-14" @default.
• W2064122173 title "Twist solitons in ordered phases of n-alkanes" @default.
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• W2064122173 doi "https://doi.org/10.1039/c1sm05326d" @default.
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