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Non-Newtonian dynamics modelled with non-linear transport coefficients at the mesoscale by using dissipative particle dynamics.
Phys Chem Chem Phys
December 2024
Departament d'Enginyeria Química, Universitat Rovira i Virgili, Tarragona, Spain.
We derive the algorithms for the dynamics of the standard dissipative particle dynamics model (DPD) for a velocity-dependent friction coefficient. By introducing simple estimators of the local rate of strain we propose an interparticle friction coefficient that decreases for high deformation rates, eventually leading to the macroscopic shear-thinning behaviour. We have derived the appropriate fluctuation-dissipation theorems that include the correction of the spurious behaviour due to the coupling of the non-linear friction and the fluctuations.
View Article and Find Full Text PDFCurrent-driven mechanical motion of double stranded DNA results in structural instabilities and chiral-induced-spin-selectivity of electron transport.
J Chem Phys
October 2024
College of Science and Engineering, James Cook University, Townsville, Queensland 4811, Australia.
Article Synopsis
- The study investigates how the mechanical motion of double-stranded DNA influences electron transport, particularly regarding chiral-induced spin selectivity and the role of spin-orbit coupling.
- It employs a mixed quantum-classical approach using nonequilibrium Green's functions to analyze time-dependent spin-resolved currents, revealing that electronic forces can alter the classical potential landscape, leading to bistability.
- The findings suggest that DNA's mechanical dynamics significantly enhance spin polarization by 9%, and current noise measurements can effectively track mechanical instabilities and the coupling between vibrational and spin dynamics within the DNA structure.
Toward vanishing droplet friction on repellent surfaces.
Proc Natl Acad Sci U S A
April 2024
Department of Applied Physics, Aalto University, Espoo 02150, Finland.
Superhydrophobic surfaces are often seen as frictionless materials, on which water is highly mobile. Understanding the nature of friction for such water-repellent systems is central to further minimize resistance to motion and energy loss in applications. For slowly moving drops, contact-line friction has been generally considered dominant on slippery superhydrophobic surfaces.
View Article and Find Full Text PDFReexamination of Damping in Sliding Friction.
Phys Rev Lett
February 2024
Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, China.
Friction is responsible for about one-third of the primary energy consumption in the world. So far, a thorough atomistic understanding of the frictional energy dissipation mechanisms is still lacking. The Amontons' law states that kinetic friction is independent of the sliding velocity while the Prandtl-Tomlinson model suggests that damping is proportional to the relative sliding velocity between two contacting objects.
View Article and Find Full Text PDFA continuum mechanical model of cell motion driven by a biphasic traction stress.
J R Soc Interface
January 2024
Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104, USA.
The aim of this paper is to place the cell locomotion problem within the general framework of classical continuum mechanics, and while doing so, to account for the deformation of the actin network in the cytoskeleton; the myosin activity on the lamellum including its effect on depolymerization at the trailing edge; model the stress-dependent driving forces and kinetic laws controlling polymerization at the leading edge, depolymerization at the trailing edge and ATP hydrolysis consistently with the dissipation inequality; and, based on the observations in Gardel (Gardel 2008 , 999-1005 (doi:10.1083/jcb.200810060)), include a biphasic velocity-dependent traction stress acting on the actin network.
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