Deformation of MoS₂ layers directly leads to decrease in potential and ultimately leads to decrease in friction coefficient.

Phase change hydrogels (PCHs), used in multiple engineering scenarios, have been developed to overcome leakage, structural instability, and low thermal conductivity of solid–liquid phase-change materials.

Turbulent flow characteristic of TiO₂–water nanofluids inside a horizontal circular tube is studied numerically by single-phase model, mixture multiphase model and Eulerian–Eulerian multiphase model. The flow characteristic is accounted from micro-flow aspect in order to reveal the mechanism of heat transfer enhancement in nanofluids. A new empirical correlation of nanoparticle viscosity has been proposed for multiphase models, which is much more precise than traditional empirical models. The presence of nanoparticles intensified local micro-flow and improved overall turbulence intensity significantly. The current study suggests that a thorough understanding on flow characteristics of nanofluids is essential for proposing mathematical description nanofluids flow.

Molecular dynamics simulations were performed to investigate the effect of nanoparticle deposition and nondeposition on the explosive boiling heat transfer. Both particle state (deposition and nondeposition) and metal surface structure (smooth and rough) were considered to study the boiling behavior. Particularly for the rough surface, a special deposition case was simulated that the deposition nanoparticle was not filled with the pit. The results showed that the addition of nanoparticles enhanced the boiling behavior. The histories of argon temperature, net evaporation number, as well as heat flux demonstrated that deposition nanofluid boiling heat transfer enhancement behavior was the highest.

There was a critical load (P_crit), such that the friction-reduction of superhydrophobic surfaces appeared only when the load <P_crit.

Experiments and simulations have shown that molybdenum disulfide (MoS ₂ ) has unique mechanical and electrical properties that make it promising for application as a flexible material in microscopic and nanoscopic electronic devices. In this paper, the molecular dynamics method is used to study the mechanical properties of multilayer MoS ₂ during compression and stretching under different intra-layer and inter-layer potentials to choose the most suitable ones. The results show that the increase in the inter-layer repulsive force during compression was all provided by sulfur atoms in the adjacent layer. The two intra-layer potentials represented two forms of tensile fracture: plastic fracture with structural holes or lattice distortions, and brittle fracture with instantaneous destruction. The chosen inter-layer potential had a significant influence on the structure of the multilayer MoS ₂ but the effect of inter-layer potential during stretching was not prominent. By comparing these results with reference values, the most suitable intra-layer and inter-layer potentials for the multilayer MoS ₂ were selected, and can serve as a reliable reference for subsequent simulations.