Advanced Materials Research Vols. 463-464

Abstract: A novel nanosized molecularly imprinted polymer spheres for atrazine was synthesized in present assay, as an alternative to the biological antibodies. Both precipitation polymerization and bulk polymerization were performed. Various combinations of template, functional monomer, and cross-linking monomer and porogenic diluents were carried out to optimize the best one. The nanosized MIPs exhibit larger surface area and better binding capacity than traditional polymers, the best binding capacity and imprinted factor for atrazine were 95.75% and 1.83 respectively.

Abstract: Silver nanocrystals were encapsulated in mesoporous silica nanoparticles (Ag-MSN) to increase stability and enhance anti-bacterial potency. The morphology of the nanoparticles was characterized by scanning electron microscopy and transmission electron microscopy. X-ray diffraction analyses proved that the silver nanocrystals were truly embedded in the mesoporous silica nanoparticles. Electrochemical impedance spectroscopy was carried out to evaluate the effect of organosiloxane film containing Ag-MSN on reducing microbiologically influenced corrosion. The excellent corrosion resistance property showed that the sol film containing Ag-MSN could significantly decrease the V. natriegens adhesion and protect the aluminum against microbiological corrosion in seawater.

Abstract: Polycrystalline Pb(Zr0.55T0.45)O3thin film was deposited on Pt/Ti/SiO2Si(100) by radio-frequency-magnetron sputtering method, the writing of charge bits and the polarization relaxation phenomena on the surface of PZT thin film was studied by Kelvin probe force microscopy and Piezoresponse force microscopy, respectively. It is found that the surface potential of the negative charge bits are higher than those of the corresponding positive ones, and the charge accumulates remarkably in high vacuum but relax more quickly. The domain images (contrast) reveal that the polarization magnitude is determined by the orientation of each grain, which is proved by the Ref 14. Taking the polarized area as whole, the relaxation of polarization magnitude (contrast) show that the polarized state in some grain can maintain at leas¬t 105s, but in other grain, the polarization disappear relatively quickly.

Abstract: The B, N, S, Si and P atoms doped single walled (5, 5) carbon nanotubes were studied by density functional theory B3LYP/3-21G (d) with the periodic boundary conditions. The ultra long tube models were calculated and the structures, energies and the band structures were obtained. The N, Si and S doped nanotubes have narrow energy gap with metal conductivity whereas B and P doped nanotubes have overlapped energy gaps with or semi-metal conductivity.

Abstract: TiO₂ nanostructures with a pure anatase phase were successfully synthesized using hydrothermal treatment of P25-TiO₂ nanoparticles. These nanostructures were characterized using transmission electron microscopy (TEM) and x-ray powder diffraction measurements. The dependences of reaction temperature and calcination temperature on titanate-anatase phase transformation and the morphology of TiO₂ nanostructures were also discussed. The results demonstrated that phase composition and particle morphology can be controlled by both the reaction and calcination temperatures.

Abstract: Na_0.5Bi_0.5TiO₃ microcubes with the side size ca. 20-30um were successfully fabricated by a Cr³⁺-assisted hydrothermal method. The obtained samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results show that Cr³⁺ played a significant role in the formation of Na_0.5Bi_0.5TiO₃ microcubes. Possible mechanisms for the growth of Na_0.5Bi_0.5TiO₃ microcubes are discussed. The results presented in this study would be important in investigating the correlation between morphology and basic physical properties, and may offer a route to control the morphology and size of crystals.

Abstract: Monodispersed ceria nanocrystals have been synthesized by an oleate-modified precipitation method combined with a hydrothermal treatment at 200°C. TEM observation indicated that ceria nanoparticles with low-crystallinity were produced by synthesis at room temperature, which were crystallized by subsequent heat treatment to form nanocrystals. Produced ceria nanocrystals were well dispersed in a nonpolar solvent and were hardly agglomerated. TEM observation and Raman spectroscopy clarified that the size of ceria nanocrystals was in the range of 2-7 nm. Interparticle distance of cerium nanocrystals two-dimensionally aligned was in the range of 1.5-4 nm, which corresponds to the exclusive distance of oleic chains. Oleate-modified ceria nanocrystals exhibited strong fluorescence by green-laser excitation. Fluorescent behavior of ceria nanocrystals indicated that oleate detachment from the ceria surface and particle growth of ceria nanocrystals could be induced by laser irradiation.

Abstract: As the improving of rewinding machine production process and the speed of rewinding machine,the higher request of rewinding machine control systemis is put forward.So the control system is established to process,analysis and share various data.According to the request, a set of complete rewinding machine measurement and control network based on Field-bus is introduced in the paper.It is testified by experiment that this system can process and share the various data

Abstract: This paper presents the main CAD –computer aided design – elements of an automatised assembly/test line, destined for work posts for the assembly/testing of the subsystem-carcass, in agreement with Compa SA Sibiu. The carcass is part of the turbo-compressor assembly (compressor + turbine) of a testing equipment. The analyzed line contains 7 work posts, with direct application to the assembly/test disc type parts but it can be generalized to the serving, to the purpose of testing, of many such posts in a automatised assembly line and carcass checking. Because carcass with lacking or inconsistent processing can end up on the assembly line, it has been decided to design and produce an automated line, so these things should not happen, because these part son an automated assembly line can cause the stopping of automated flux until the faulty part is being replaced.

Abstract: This paper deals with a harmonic drive, which can be used for an industrial robot, such as RIP 63, COMAU, or KUKA (RRR). The robot could be integrated in an industrial manufacturing process where it has to manipulate / transport bags, sacks, or other loads. The paper presents also the experimental setup for efficiency determination as well as experimental determinations. The computation operations were performed in MATLAB environment and the results were in good agreement with experimental tests.