Showing papers by "Huaqing Xie published in 2016"

Thermal Conductivity of Composite Materials Containing Copper Nanowires

Abstract: The development of thermal conductive polymer composite is necessary for the application in thermal management In this paper, the experimental and theoretical investigations have been conducted to determine the effect of copper nanowires CuNWs and copper nanoparticles CuNPs on the thermal conductivity of dimethicone nanocomposites The CuNWs and CuNPs were prepared by using a liquid phase reduction method, and they were characterized through scanning electron microscopy SEM and X-ray diffraction XRD The experimental data show that the thermal conductivity of composites increases with the increase of filler With the addition of 10 vol% CuNWs, the thermal conductivity of the composite is 041 W/m/K The normalized thermal conductivity enhancement factor is 273, much higher than that of the analogue containing CuNPs 167 These experimental data are in agreement with Nan’s model prediction Due to the high aspect ratio of 1D CuNWs, they can construct thermal networks more effectively than CuNPs in the composite, resulting in higher thermal conductivity

Synergistic improvement of thermal transport properties for thermoplastic composites containing mixed alumina and graphene fillers

Abstract: In this work, a novel approach was developed for obtaining a strong three-dimensional network of heat conducting path by filling alumina (Al2O3) and graphene sheets (GR) into poly(ethylene-co-vinyl acetate) (EVA). This unique structure effectively prevents the inter-sheet restacking of graphene sheets and minimizes the thermal contact resistance between fillers and interface. The resultant exhibits a high thermal conductivity of 2.40 ± 0.07 W/m K, which is much higher than single filler at the same loading. Additionally, a strong synergistic effect can also be observed, and three-dimensional schematic models were simulated for this enhancement. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43242.

Sintering Behavior and Effect of Silver Nanowires on the Electrical Conductivity of Electrically Conductive Adhesives.

Abstract: In this paper, two kinds of silver nanowires with a 160 nm average diameter ranging from 30 to 90 µm length and a 450 nm average diameter up to 100 µm length were successfully synthesized by a polyol process with FeCl3 and Na₂S as reaction inhibitor, respectively. The experimental results indicate that the morphologies and sintering behaviors of both of silver nanowires are impacted by glutaric acid and sintering temperature. The isotropically conductive adhesives (ICAs) filled with micro-sized silver flakes and silver nanowires as hybrid fillers were fabricated and the electrical properties were investigated based on the fraction of the silver nanowires of the total of silver fillers and the curing temperature, etc. The in situ monitoring the variation in electrical resistance of the ICAs explores that silver nanowires have influence on the curing behavior of the ICAs. Silver nanowires synthesized with Na2S as reaction inhibitor and treated with glutaric acid can significantly improve the electrical conductivity of the ICAs in the case of the low loading of silver fillers in the appropriate proportion range of the weight ratio of micro-sized silver flakes and silver nanowires, primarily as a result of connecting effect. When the loading of silver fillers in the ICAs is high, the electrical conductivity is also enhanced slightly in the case of the proper fraction of silver nanowires of the total of silver fillers. The effect of the curing temperature on the electrical conductivity relates to the fraction of silver nanowires and the total loading of silver fillers. The electrical conductivity of the ICAs filled with micro-sized silver flakes and silver nanowires synthesized with FeCl₃ as reaction inhibitor is greatly damaged, indicating that the size of silver nanowires also is one of main factor to impact the electrical conductivity of the ICAs doped with silver nanowires. The electrical property of the ICAs filled with micro-sized silver flakes and silver nanowires results mainly from the synergy of silver flakes and nanowires, forming the conductive pathways.