Article
Chemistry, Physical
Changli Yi, Chengzhi Hu, Lin Shi, Minli Bai, Yubai Li, Dawei Tang
Summary: Due to its excellent anti-friction and anti-wear properties, nano-MoS2 is considered to have great potential in lubrication, such as being used as a nano-additive in lubricating oil or solid lubricants. Through molecular dynamics simulation, the lubrication mechanism of MoS2 was explained from an atomic perspective, showing how it reduces friction coefficient and wear. The proposed mechanism provides a reference for the further application of MoS2 in lubrication.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Vahid Mosallanejad, Jingqi Chen, Wenjie Dou
Summary: In this paper, a Fokker-Planck equation is derived to describe nonadiabatic molecular dynamics with electronic friction for Floquet-driven systems. The breakdown of the Born-Oppenheimer approximation in strong Floquet driving is also observed.
Article
Engineering, Chemical
Even Marius Nordhagen, Henrik Andersen Sveinsson, Anders Malthe-Sorenssen
Summary: Friction is the force that opposes the relative motion of objects. This study explores the effect of crystal faceting on increasing contact quantity in cubic silicon carbide. The observed frictional aging effect follows a logarithmic pattern driven by internal capillary forces, which is different from traditional friction mechanisms. A new diffusion-driven frictional aging model is proposed, providing an alternative explanation for the observed logarithmic aging behavior.
Article
Chemistry, Multidisciplinary
Shaoqian Hao, Zhang Xie, Zheng Li, Jianlong Kou, Fengmin Wu
Summary: The study reveals that the direction of water droplet transport on a grooved surface is determined by its initial position. When placed near the wider end initially, the water droplet moves towards the wider end; when placed near the narrower end, it moves in the opposite direction. This phenomenon is attributed to the interactions of the groove substrate and upper layers with water droplets, providing insights for designing nanostructured surfaces to control droplet motion effectively.
Article
Multidisciplinary Sciences
Abbasali Abouei Mehrizi, Shiji Lin, Lijie Sun, Yile Wang, Longquan Chen
Summary: The addition of high molecular weight polymer stabilizes droplets on superhydrophobic wire meshes, suppressing their spray behavior. Penetrated ligaments retract and merge with droplets on the mesh, and their evolution follows the Kelvin-Voigt model. The additive polymer also alters the recoil penetration mechanism.
SCIENTIFIC REPORTS
(2022)
Article
Zoology
Alexandra M. Pamfilie, Austin M. Garner, Anthony P. Russell, Ali Dhinojwala, Peter H. Niewiarowski
Summary: Claws are important for prey capture, locomotion, and attachment in limbed amniotes. Previous studies have found correlations between claw morphology and habitat use, suggesting that claw shape varies to function effectively in different microhabitats. This study focused on the effect of claw shape on frictional interactions, and found that the diameter of the claw's tip is the most important predictor of friction, with narrower tips inducing greater friction on substrates that permit mechanical interlocking. Claw curvature, length, and depth also influence friction, but their effects depend on substrate surface roughness.
Article
Materials Science, Multidisciplinary
Thibault Roch, Efim A. Brener, Jean-Francois Molinari, Eran Bouchbinder
Summary: Frictional sliding is a complex phenomenon influenced by various factors and can lead to self-healing slip pulses. Velocity-driven frictional systems exhibit coarsening dynamics saturated at system length in the sliding direction, resulting in steadily propagating pulses. For sufficiently small system heights, the pulse may be accompanied by periodic elasto-frictional instabilities.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Automation & Control Systems
Yuanjun Jia, Pan Liao, Yong Wang, Dong Sun
Summary: This paper proposes a magnetically powered and frictional anisotropy-based microwalker that can potentially be used in nonliquid-filled environment. The microwalker is constructed by rigid segments connected by a joint and has gecko setae-like tentacles for friction generation. The microwalker can be controlled to move in low-Reynolds regimes and climb slopes driven by a planar magnetic field. Several experiments have demonstrated its good motion capability. This study provides a new solution to microrobot design for future biomedical applications.
ADVANCED INTELLIGENT SYSTEMS
(2022)
Article
Mechanics
Fuzheng Guo, Shuzheng Zhang, Wenlong Hu, Yunong Zhou, Chaofan Du, Fangxin Wang, Bin Yang
Summary: This study proposes a three-dimensional computational fluid dynamics (CFD) model to investigate the droplet impact dynamics on a superhydrophobic surface. The 3D CFD model reveals significant dynamic details that were not easily captured in 2D models or practical experiments. It provides a unique perspective to understand the dynamic behaviors of impinged droplets and offers insights into the solid-liquid contact area and vortex generation.
Article
Engineering, Multidisciplinary
Han Hu, Anas Batou, Huajiang Ouyang
Summary: This paper addresses the issue of frictional contact between an elastomer and a rigid body with randomly rough surfaces. The research is based on a framework for generating random geometries and a robust frictional contact algorithm, both realized through the approach of Isogeometric analysis (IGA). Numerical experiments show that factors such as the roughness and correlation length of the random surface, as well as the external traction, have a significant influence on the ratios characterizing the frictional contact.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Jie Zhu, Qihan Liu
Summary: This study investigates the behavior of gel surfaces and reveals that their behavior is influenced by both osmocapillary phase separation and elastocapillary deformation. A numerical model is developed to predict the phase separation and deformation on gel surfaces, and simulations are conducted to observe the behavior of sinusoidal and rough surfaces. The results show that the behavior of gel surfaces is determined by the relative lengths of osmocapillary and elastocapillary scales compared to the surface roughness scale.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Energy & Fuels
Yuanhao Chang, Senbo Xiao, Rui Ma, Xiao Wang, Zhiliang Zhang, Jianying He
Summary: In this study, the displacement dynamics of residual oil trapped in rough channels by different nanofluids were investigated using atomistic modeling. The results showed that both hydrophilic nanoparticles (NPs) and Janus NPs had significant oil displacement effects. Hydrophilic NPs increased the viscosity and widened the sweeping range of the injected fluid, while Janus NPs either reduced the interfacial tension at the oil-water interface or adsorbed onto the convex surface. Janus NPs displaced trapped oil molecules and altered the local surface wettability by sliding along the surface. In contrast, hydrophobic NPs tended to migrate into the oil phase and reinforced the trapping effect of oil molecules while increasing the risk of channel blockage. However, Janus NPs maintained a stable oil displacement performance even under low pumping force due to their long contact time with the oil phase. The findings suggested that Janus NPs have exceptional application potential in reservoirs under realistic flooding conditions.
Article
Chemistry, Physical
Dan Su, Lei Zhang, Jianying Guo, Shengyu Liu, Bao Li
Summary: This study employed molecular dynamics simulations to clarify the mechanism of adsorption and accumulation of gas on rough surfaces during flotation, revealing that van der Waals force plays a leading role throughout the entire adsorption process. The findings contribute to a better understanding of the gas-liquid-solid interaction mechanism in the flotation process.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
Man Wang, Yi Wan, Gongming Xin
Summary: In this study, the influence of vibration on the evaporation and boiling performance of water nanofilm on rough surfaces was investigated using molecular dynamics method. The results showed that vibration suppressed the atomization of water nanofilm, and the atomization modes varied with the amplitude and frequency of the vibration. For rough surfaces, the weakening of vibration-induced evaporation and boiling performance of water nanofilm was attributed to the reduction of surface hydrophilicity.
APPLIED SURFACE SCIENCE
(2023)
Article
Geochemistry & Geophysics
Shahar Gvirtzman, Jay Fineberg
Summary: Frictional interfaces become unstable due to earthquake-like ruptures, which are similar to shear cracks. The nucleation of rupture determines the onset of friction and it is influenced by local stress and contact area topography. Nucleation events occur as 2D patches that expand at low velocities and are affected by the local stress level.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Mechanics
Joao Pedro Jerico, Francois P. Landes, Matteo Marsili, Isaac Perez Castillo, Valerio Volpati
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2016)
Article
Physics, Fluids & Plasmas
Francois Landes, Alberto Rosso, E. A. Jagla
Article
Physics, Multidisciplinary
E. A. Jagla, Franois P. Landes, Alberto Rosso
PHYSICAL REVIEW LETTERS
(2014)
Article
Geochemistry & Geophysics
Eugenio Lippiello, Giuseppe Petrillo, Francois Landes, Alberto Rosso
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2019)
Article
Physics, Fluids & Plasmas
Francois P. Landes, Giulio Biroli, Olivier Dauchot, Andrea J. Liu, David R. Reichman
Article
Physics, Fluids & Plasmas
F. Pellegrini, Francois P. Landes, A. Laio, S. Prestipino, E. Tosatti
Article
Physics, Fluids & Plasmas
Francois P. Landes, E. Lippiello
