Papers by Keyword: Nano-Assembly

Abstract: A series of macropore host-guest catalysts were prepared by third nanoassembly technique. nanoassembly support had a pore volume of 1.32cm³ /g,a specific surface area of 220m²/g, average pore diameter of 27.3nm, the most probable pore diameter of 40nm, a low stacking density of 0.34g/cm³. The results of the XRD and TEM showed that the part of pore was blocked with increasing the amount of active metal. But the aggregation phenomenon was improved by adding uniformly co-impregnant, and the amount of active metal was up to 40%. The lamellar structure of sulfided state metal was formed which the length were between 8 nm to 10 nm and layer were 3~9. Hydrogenation performance of the different catalysts has been evaluated. The removal rates of desulfurization, denitrification, residual carbon and demetalization for hydrotreating in one gram active metal per 100mL volume for FB30 were as 2.0, 2.6, 2.0 and 2.5 times as FC, respectively. The results explained that the macropore host-guest catalyst had higher activity for hydrotreating residue.

Abstract: This paper describes a virtual reality (VR) simulator for the manipulation of carbon multi-wall nanotubes with atomic force microscope (AFM). Major challenges in interfacing a human operator with tasks of manipulating nanotubes via a haptic VR interface are outlined. After a review of our previous efforts, we present the current state of our VR simulator for multi-wall nanotube manipulation. The collision detection, interaction force modeling, deformation simulation and haptic rendering of nanotubes are then discussed. Results of virtual manipulation of carbon nanotubes are presented within an immersive VR set-up.

Abstract: A mechanical nanomanipulation system has been developed for the assembly and fabrication of nano-devices inside a scanning electron microscope (SEM). The mechanical manipulator is made up of commercially available actuators and positioning stages which consists of three individual operation units each having three linear stages and one rotational stage. Experiments were performed to construct 2D and 3D nanostructures with Au nanowires. Versatile manipulations including shape modification, length amendment, and connection of nanowires were carried out. An electron beam induced deposition (EBID) technique was used to grasp nano-materials and assemble them, enabling 2D and 3D manipulation to be easier to conduct. Experimental results show that this manipulator is possible to play an important role in enabling the technology of assembling nano-scale mechanical and electronic devices from prefabricated nano-scale components.