Current-induced mechanical torque in chiral molecular rotors

• Richard Korytár and
• Ferdinand Evers

Beilstein J. Nanotechnol. 2023, 14, 711–721, doi:10.3762/bjnano.14.57

• T is expected to change via the linear increase of M = M1N. Provided the impact velocity is fast enough, the universal curve has a negligible velocity dependence. Figure 8 in the Appendix section shows that for smaller velocities, the threshold Im shifts to higher values. The limit ΔV → 0+ is also

• motion to an unbound motion, with a non-constant velocity. Threshold mass current as a function of the impact velocity for different values of the exit radius ρF. μ = 0.05. Velocity dependence of the threshold momentum current . The large-velocity limit is dominated by the garden hose effect, that is

• , angular momentum boosts. Velocity dependence of average angular velocity of the path exposed to a mass current Im. For lower velocities the threshold current increases, marking a departure from the SA. Threshold mass ratio m/M for an unbound directed motion as a function of the helix length N (δN = 1) and

Effect of lubricants on the rotational transmission between solid-state gears

• Huang-Hsiang Lin,
• Jonathan Heinze,
• Alexander Croy,
• Rafael Gutiérrez and
• Gianaurelio Cuniberti

Beilstein J. Nanotechnol. 2022, 13, 54–62, doi:10.3762/bjnano.13.3

• friction or gear–lubricant friction are accounted for within the MD simulation in the form of an irreversible rotational kinetic energy dissipation. The energy of gear rotation can be transferred to deformation energy [49] or to the lubricants due to microscopic Lennard-Jones interactions. Angular velocity

• dependence From the previous section, we know that the lubricants can assist the transmission of angular momentum between gears. One might still wonder if the angular velocity of the first gear plays any role. Therefore, we performed MD simulations with different initial angular velocities ω = π, 2π and 4π

Nanotribology

• Enrico Gnecco,
• Susan Perkin,
• Andrea Vanossi and
• Ernst Meyer

Beilstein J. Nanotechnol. 2018, 9, 2330–2331, doi:10.3762/bjnano.9.217

• , different authors have modeled the influence of electrical double layers on hydrodynamic lubrication [6], the occurrence of a second-order phase transition in ultrathin lubricant films [7] and the velocity dependence of dry friction on crystal surfaces at the atomic scale [8]. While many experimental

Velocity dependence of sliding friction on a crystalline surface

• Christian Apostoli,
• Giovanni Giusti,
• Jacopo Ciccoianni,
• Gabriele Riva,
• Rosario Capozza,
• Rosalie Laure Woulaché,
• Andrea Vanossi,
• Emanuele Panizon and
• Nicola Manini

Beilstein J. Nanotechnol. 2017, 8, 2186–2199, doi:10.3762/bjnano.8.218

• ; dissipation; friction; nanotribology; phonons; velocity dependence; Introduction Friction affects a wide variety of phenomena spanning broad ranges of length and time scales. Due to its practical and technological relevance, the study of friction was addressed even long before physics became a science

Nanoscale rippling on polymer surfaces induced by AFM manipulation

• Mario D’Acunto,
• Franco Dinelli and
• Pasqualantonio Pingue

Beilstein J. Nanotechnol. 2015, 6, 2278–2289, doi:10.3762/bjnano.6.234

• thus demonstrated that the ripples move after consecutive frames in a manner that can be considered similar to a wave packet travels in space. Additionally, they have managed to calculate the corresponding group velocity. Dependence on material properties Molecular weight (Mw): For amorphous polymers

Manipulation of gold colloidal nanoparticles with atomic force microscopy in dynamic mode: influence of particle–substrate chemistry and morphology, and of operating conditions

• Samer Darwich,
• Karine Mougin,
• Akshata Rao,
• Enrico Gnecco,
• Shrisudersan Jayaraman and
• Hamidou Haidara

Beilstein J. Nanotechnol. 2011, 2, 85–98, doi:10.3762/bjnano.2.10

• discussion, it appears that further investigations regarding the velocity dependence of the dissipated power are still necessary on both experimental and theoretical levels. This work is now under investigation and we hope to be able to give an additional and detailed explanation regarding the mechanisms

• operating environment conditions (relative humidity RH% and temperature T), as well as the tip scan velocity. The dissipated power during manipulation was quantified under various operating conditions (RH%, T, tip scan speed). Our experiments show that the velocity dependence of the dissipated power at

• . These experiments were repeated for different scan tip velocities ranging from 0.1 up to 10 µm·s−1 on three model substrates, i.e., a cleaned silicon wafer (SiO2), and two other ones, coated with either hydrophilic (–NH2) or hydrophobic (–CH3) self-assembled monolayers. The results of the velocity