No abstract

No abstract

Friction stir welding of high density polyethylene sheets was performed at different rotational and welding speeds and the material temperature close to the welding zone was monitored by infrared thermography and thermocouple measurements. Welding quality was evaluated by macrostructure analysis and tensile testing. Fracture surfaces of the tensile specimens were also analyzed. It was found that weld quality is highly dependent on the temperature of the material in the welding zone. For some specific welding conditions the welding process was unstable due to elevated temperatures reaching the melting point of HDPE. Instability of the welding processes was characterized by cyclic material temperatures and down forces. Decreasing the welding speed and increasing the rotational speed was found to improve weld quality.

No abstract

We have designed and demonstrated a complementary metal-oxide-semiconductor compatible process for fabricating high capacitance micro-capacitors based on vertically grown silver nanowires on silicon substrates. Array of silver nanowires with high-aspect ratio were electrochemically grown in the pores of anodized aluminum oxide film, which was pre-formed through anodization of aluminum thin film deposited on titanium/silicon oxide/silicon substrates. High dielectric bismuth ferric oxide layer was electrodeposited to fill the gap between silver nanowires after anodized aluminum oxide film was removed. It was found that the micro-capacitor based on the silver nanowires/bismuth ferric oxide composite film possessed higher capacitance by approximately one order of magnitude from the COMSOL simulation results from the flat Ag thin-film capacitor and the silver nanowire capacitor.

No abstract

No abstract

Phone: þ82 2 3290 3281, Fax: þ82 2 928 3584Three-dimensional printing (3DP) technology has attracted interest in various fields of applications. However, most of the previous studies are focusing on additive printing or developing new printable materials to functionalize the printed structures. Those approaches obviously have shown great performance, but still have no solution to functionalize original printing materials that are supplied by printer suppliers. In this study, we report a feasible method to fabricate three-dimensional printed micro-containers (MCs) coated with Ni-Au core-shell nanowires (NWs) that have multifunctional properties. The surfaces of the polymer-based micro-containers are modified with thiol groups. Then Ni-Au nanowires are directly attached without further treatment. Our approach expands direct applications of polymeric 3DP materials to biomedical and pharmaceutical technology as a utilized platform for functional nanostructures.