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| 1 | Asymmetrical free diffusion with orientation-dependence of molecules in finite timescales显示文摘Using molecular dynamics simulations, we show that free diffusion of a nanoscale particle (molecule) with asymmetric structure critically depends on the orientation in a finite timescale of picoseconds to nanoseconds. In a timescale of ~100 ps, there are ~10% more possibilities for the particle moving along the initial orientation than moving opposite to the orientation; and the diffusion distances of the particle reach ~1 nm. We find that the key to this observation is the orientation-dependence of the damping force to the moving of the nanoscale particle and a finite time is required to regulate the particle orientation. This finding extends the work of Einstein to nano-world beyond random Brownian motion, thus will have a critical role in the understanding of the nanoscale world. | SHENG Nan TU YuSong GUO Pan WAN RongZheng FANG HaiPing | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，6： | 2 |
| 2 | Friction force effects on vertical manipulation of nanoparticles显示文摘In humid environment,a particles can be picked up from the substrate by the capillary force,such as in the colloidal probe of atomic force microscopy technique.In this paper,a model of the capillary bridge between spherical particles is used to study effect of the friction force in nanoparticles manipulation.Based on the Young-Laplace equation,Newtonian equation and adopted the constant volume boundary condition to calculate the particle motion,the friction force effects on nanoparticles manipulation are analyzed.The results show that the friction force has little effect on the particle motion,and the particle velocity decreases slightly in presence of the friction force.The friction force is opposed to the motion of the nanoparticle.As the tip velocity increases,there is a critical velocity beyond that the particle cannot be picked up from the substrate,and the critical velocity decreases in presence of the friction force.These provide a better understanding of the nanoparticle mechanical properties in humid environment. | YANG Li SHENG Nan TU Yusong WANG Chunlei FANG Haiping | 2012 | Nuclear Science and Techniques2012，23，3： | 1 |
| 3 | Destructive extraction of phos- pholipids from Escherichia coli membranes by graphene nanosheets 显示文摘 | Tu Yusong Lv Min Xiu Peng | 2013 | Nature Nanoteehnology2013，，8： | 1 |
| 4 | Water transport through T-shaped carbon nanotubes显示文摘The effect of an external charge on water transportation through T-shaped carbon nanotubes is tested by molecular dynamics simulations.The simulation results show that a relatively small charge reduces the water flux through the canbon nanotubes,but a large enough charge prompts the water transportation.This finding may be helpful to biological amplifiers and nanodevices researches. | XU Wei TU Yusong Wang Chunlei FANG Haiping | 2011 | Nuclear Science and Techniques2011，22，5： | 0 |
| 5 | System-size effect on the friction at liquid-solid interfaces显示文摘The friction at the liquid-solid interfaces is widely involved in various phenomena ranging from nanometer to micrometer scales. By the molecular dynamic(MD)simulation, the friction properties of liquid-solid interfaces at the molecular level are calculated via the Green-Kubo relation. It is found that the system size will influence the value of the friction coefficient, especially for the solid surfaces with the larger polar charge. The value of the friction coefficient decreases with the increase in the system size and converges at large system sizes. The large polar charge will lead to a significant friction coefficient. However, the diffusion of water molecules on this surface is almost a constant, indicating that the diffusion coefficient seems to be independent of the system size and polar charge. This work provides insights for the selection of the system size in modeling the frictional properties of hydrophobic/hydrophilic surfaces. | Liang ZHAO Jiajia SUN Xian WANG Li ZENG Chunlei WANG Yusong TU | 2020 | Applied Mathematics and Mechanics(English Edition)2020，41，3： | 0 |
| 6 | A new association state of solutes in nanoconfined aqueous solutions显示文摘Recently, we have found a reversible transition between the dispersion and aggregation states of solute molecules in aqueous solutions confined in nanoscale geometry, where solutes exhibit distinct behavior in a new association state from that in the dispersion and aggregation states observed usually in macroscopic systems. However, it remains unknown whether this new association state of solute molecules found in nanoconfined systems would vanish with the system size increasing and approaching the macroscopic scale. Here, we achieve the phase diagram of solute association states by making the analyses of Gibbs free energy of solutes in nanoconfined aqueous solutions in detail. In the phase diagram, we observe a closed regime with a finite system size of nanoconfined aqueous solutions and a solute concentration range, only in which there exists the new association state of solutes with the reversible transition between the aggregation and dispersion states, and there indeed exists an upper limit of the system size for the new association state, around several tens nanometers. These findings regarding the intimate connection between the system size and the solute association behavior provides the comprehensive understanding of the association dynamics of solutes in nanoconfined environment. | YuSong Tu Liang Zhao HaiPing Fang | 2016 | Science China(Physics,Mechanics & Astronomy)2016，59，11： | 0 |
| 7 | Asymmetric nanoparticle may go 'active' at room temperature显示文摘Using molecular dynamics simulations,we show that an asymmetrically shaped nanoparticle in dilute solution possesses a spontaneously curved trajectory within a finite time interval,instead of the generally expected random walk.This unexpected dynamic behavior has a similarity to that of active matters,such as swimming bacteria,cells,or even fish,but is of a different physical origin.The key to the curved trajectory lies in the non-zero resultant force originated from the imbalance of the collision forces acted by surrounding solvent molecules on the asymmetrically shaped nanoparticle during its orientation regulation.Theoretical formulae based on microscopic observations have been derived to describe this non-zero force and the resulting motion of the asymmetrically shaped nanoparticle. | Nan Sheng YuSong Tu Pan Guo RongZheng Wan ZuoWei Wang HaiPing Fang | 2017 | Science China(Physics,Mechanics & Astronomy)2017，60，4： | 0 |
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