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• W2952337216 abstract "Through molecular dynamics simulations, we examined hydrodynamic behavior of the Brownian motion of fullerene particles based on molecular interactions. The solvation free energy and the velocity autocorrelation function (VACF) were calculated by using the Lennard-Jones (LJ) and Weeks-Chandler-Andersen (WCA) potentials for the solute-solvent and solvent-solvent interactions and by changing the size of the fullerene particles. We also measured the diffusion constant of the fullerene particles and the shear viscosity of the host fluid, and then the hydrodynamic radius $a_mathrm{HD}$ was quantified from the Stokes-Einstein relation. The $a_mathrm{HD}$ value exceeds that of the gyration radius of the fullerene when the solvation free energy exhibits largely negative values using the LJ potential. In contrast, $a_mathrm{HD}$ becomes comparable to the size of bare fullerene, when the solvation free energy is positive using the WCA potential. Furthermore, the VACF of the fullerene particles is directly comparable with the analytical expressions utilizing the Navier-Stokes equations both in incompressible and compressible forms. Hydrodynamic long-time tail $t^{-3/2}$ is demonstrated for timescales longer than the kinematic time of the momentum diffusion over the particles' size. However, the VACF in shorter timescales deviates from the hydrodynamic description, particularly for smaller fullerene particles and for the LJ potential. This occurs even though the compressible effect is considered when characterizing the decay of VACF around the sound propagation time scale over the particles' size. These results indicate that the nanoscale Brownian motion is influenced by the solvation structure around the solute particles originating from the molecular interaction." @default.
• W2952337216 created "2019-06-27" @default.
• W2952337216 creator A5009612150 @default.
• W2952337216 creator A5026054733 @default.
• W2952337216 creator A5041438297 @default.
• W2952337216 creator A5071649649 @default.
• W2952337216 date "2019-01-01" @default.
• W2952337216 modified "2023-10-16" @default.
• W2952337216 title "Bridging the gap between molecular dynamics and hydrodynamics in nanoscale Brownian motions" @default.
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• W2952337216 doi "https://doi.org/10.1039/c9sm00246d" @default.
• W2952337216 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31086871" @default.
• W2952337216 hasPublicationYear "2019" @default.
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