Nanomechanical resonators based on group IV element monolayers.

We perform molecular dynamics simulations to investigate the energy dissipation of the resonant oscillation for the group IV monolayers of puckered configuration, in which the oscillation is driven with different actuation velocities. We find that, in the moderate actuation velocity regime, the nonlinear coupling between the resonant oscillation mode and other high-frequency modes will lead to the non-resonant motion of the system. For the larger actuation velocity, the effective strain generated during the resonant oscillating causes a structural transition from the puckered configuration into the planar configuration, which is a characteristic energy dissipation mechanism for the resonant oscillation of these group IV puckered monolayers.

Self-cleaning by harnessing wrinkles in two-dimensional layered crystals.

Two-dimensional (2D) layered crystals are prone to bending and folding owing to their ultra-low bending stiffness. Folds are traditionally viewed as defects that degrade the material performance. Here, we demonstrate that folds and cohesive forces in 2D layered crystals like graphene and MoS can be exploited to collect and clean up interlayer impurities, wherein multiple separated impurities agglomerate into a single, large cluster.

[Nanogold inhibits angiogenesis and growth of liver cancer: experiment with mice].

Objective: To investigate the effects of nanogold in inhibition of angiogenesis and growth of liver cancer cells.

Methods: Nanogold was co-incubated with VEGF165 and VDGF121 respectively. Atomic force microscopy (AFM) was used to observe the changes of the form of the particles.