Size effect on Debye temperature of metal crystals.

Understanding the physical origin of materials exhibiting different properties at the mesoscale is of great significance for the design and fabrication of multifunctional quantum devices. In this work, we proposed a simple model without any adjustable parameters to describe the size () dependence of Debye temperature () of metallic nanocrystals. () drops with the decrease of , which is verified by relevant experimental and simulation results.

Balanced Mechanical and Biotribological Properties of Polymer Composites Reinforced by a 3D Interlocked SiN Nanowire Membrane.

Polymer composites have great potential applications in the hip joint replacement, where the combinations of high mechanical strength and excellent biotribological properties are required. In this work, a well-dispersed three-dimensional (3D) silicon nitride nanowire membrane (SNm) designed as a reinforcement and brushite (Bs) served as bioactive filler are constructed into the polymer matrix, forming SNm-reinforced Bs/polymer composites (SNm-Bs/Pm). Especially, SNm could form a 3D interlocked structure, where the ultralong silicon nitride nanowires are entangled with each other.

Interfacial melting mechanism of nanocrystals determined by interfacial energy and interfacial stress.

To clarify the interface melting mechanism, a unified analytical expression was developed to describe the depression and superheating of () functions for metallic nanoparticles, nanostructures, and nanoparticles embedded in a coherent or incoherent interface. () functions are determined by the sign of , (or and ), and as caused by the change of interface environments. We found that there is CIm() > NSm() > IIm() > NPsm() for Ag nanocrystals within different interfaces.

Ultrasound-induced liquid/solid interfacial reaction between Zn-3Al alloy and Zr-based bulk metallic glasses.

Ultrasound-assisted fluxless brazing of Zr based Bulk metallic glasses (Zr-BMG) joint using Zn-3Al filler metal was performed in this study. The effect of ultrasonic vibration time on the microstructure and mechanical properties of Zr-BMG joints were investigated. Results showed that excellent metallurgic bonding could be obtained in ultrasonically brazed Zr-BMG joints.

Tunable CsPbBr/CsPbBr phase transformation and their optical spectroscopic properties.

As a novel type of promising materials, metal halide perovskites are a rising star in the field of optoelectronics. On this basis, a new frontier of zero-dimensional perovskite-related Cs4PbBr6 with bright green emission and high stability has attracted an enormous amount of attention, even though its photoluminescence still requires to clarification. Herein, the controllable phase transformation between three-dimensional CsPbBr3 and zero-dimensional Cs4PbBr6 is easily achieved in a facile ligand-assisted supersaturated recrystallization synthesis procedure via tuning the amount of surfactants, and their unique optical properties are investigated and compared in detail.

Conducting polymer-coated MIL-101/S composite with scale-like shell structure for improving Li-S batteries.

Lithium-sulfur batteries are regarded as a promising energy storage system. However, they are plagued by rapid capacity decay, low coulombic efficiency, a severe shuttle effect and low sulfur loading in cathodes. To address these problems, effective carriers are highly demanded to encapsulate sulfur in order to extend the cycle life.