Applied Mechanics and Materials Vols. 110-116

Abstract: Within the framework of the quantum phase space representation established by Torres-Vega and Frederick, we solve the rigorous solutions of the stationary Schrödinger equations for the one-dimensional harmonic oscillator by means of the quantum wave-mechanics method. The result shows that the wave mechanics and the matrix mechanics are equivalent in phase space, just as in position or momentum space.

Abstract: Using magnetron sputtering technology, the CuInSi nanocomposite thin films were prepared by magnetron co-sputtering method and multilayer synthesized method respectively,and followed by annealing in N₂ atmosphere at different temperatures. The structure of CuInSi nanocomposite films were detected by X-ray diffraction (XRD); X-ray diffraction studies of the annealed films indicate the presence of CuInSi, the peak of main crystal phase is at about 2θ=42.308°,meanwhile,there are In₂O₃ peak and other peaks in the XRD patterns of films. The morphology of the film surface was studied by SEM. The SEM images show that the crystalline of the film prepared by multilayer synthesized method was granulated, But the crystalline of the film prepared by magnetron co-sputtering with needle shape. The grain size is a few hundred angstroms. The band gap has been estimated from the optical absorption studies and found to be about 1.40 eV for the sample by magnetron co-sputtering, and 1.45eV for the sample by multilayer synthesized, but all changes with the purity of CuInSi.

Abstract: Nano-sized spherical poly (acrylic acid) (PAA) brushes (SPB) were prepared on the surface of colloidal polystyrene (PS) particles by photo-emulsion polymerization. Atomic force microscopy (AFM) was employed to observe the assembly of SPB on substrates of silicon, gold and mica with various surface properties and to determine the morphological information including particle size, shape and core-shell structure of SPB. We found that the surface polarity, electrostatic interactions between SPB and substrate surface and among SPB and capillary forces during sample drying affect the SPB assembly on substrate surface and their morphology.

Abstract: Till-date research in communications industry has mainly focused on systems based on electromagnetic propagation. However, in nanotechnology the scales are very minute, hence it needs further research that whether these concepts apply or not. So far, molecular communications research has studied the propagation of individual molecules between closely spaced transmitters and receivers as embedded in a fluid medium. Using these concepts, scientists are now investigating into nanomachines, nanomedicines, nanorobotics, and bio-chips which have enabled to further the computer science communications with biologically inspired algorithms. If timely parallels can be drawn between molecular communications and electrical communications there is potential for cross-learning and an opportunity to pioneer new developments. This paper aims to bring forth the key principles in molecular communication and their relationship to electrical communications as out-of-the-box philosophy for academicians and students.

Abstract: Over the past decades, there have been significant advances in techniques to generate and detect terahertz (THZ) signals, but there have been comparatively few reports of structures that manipulate and control them. In this paper, based on the characteristic matrix method, hydrogenated amorphous silicon (a-Si [H]) and silicon oxide (SiO2) were chosen as coating materials, a nanostructure multiplayers as broadband antireflection coating used at terahertz frequencies region was designed. Which has a residual reflectivity of less than 0.07 and average reflectivity about 0.05 throughout the 50–140 cm-1 region

Abstract: TiO₂ nanotube was prepared by anodization method. CuO and WO₃ were loaded by wet impregnation method. The microstructure, phase characteristic and photoelectrocatalytic hydrogen generation performance were studied. The annealed samples were soaked in a mixture solution containing tungstic acid and Cu (NO₃)₂ and then post-annealed to fabricate Cu-loaded TiO₂ nanotube. The obtained samples were characterized by SEM, EDX, XRD and the photoelectrocatalytic hydrogen generation under UV illumination was measured and compared.

Abstract: In this study, PA66 nanofibers were successfully solution electrospun. The crystalline morphological features of HDPE solution induced by nanofibers were investigated by scanning electron microscopy (SEM). Nanohybrid shish-kebab (NHSK) can be formed in HDPE solution via isothermal crystallization, in which PA66 nanofibers serve as shish and HDPE lamellae act as kebabs surrounding the nanofibers periodically. Additionally, crystallization time has significant effect on the structure of HDPE kebab in NHSK, i.e., as crystallization time increases, the size of the kebab increases and the crystals decorated on PA66 nanofibers exhibit a three-dimensional growth (i.e., aggregate of crystallites) rather than a two-dimensional one (i.e., disc-like lamellae normal to the axis of nanofiber).

Abstract: Nanoparticles usually prepared through chemical synthetic method. In our study, nanoCoenzyme Q10 was prepared by water jet comminution process. The results were characterized with scanning electron microscope (SEM) and the color change of the water solution. The color becomes lighter when the particles have a smaller size. The effect of comminution is related to the number of process cycles. nanoCoenzyme Q10 water solution (particle size less than 50nm) was obtained through water jet comminution at 50Mpa with five cycles. This new method not only solves the problem of physical comminution collection, but also gives an effective way to prepare natural nanoparticles.

Abstract: Expanded perlite (EP) modified titanium dioxide (TiO₂) with different loading times were prepared by Sol-Gel method. Photocatalytic degradation kinetics of Rhodamine B (RhB) in polluted water by the materials (EP-nanoTiO₂), as well as the effects of different loading times and the initial concentration of RhB on photocatalysis rate were examined. The catalytic activity of the regenerated photocatalyst was also tested. The results showed that photocatalyst modified three times with TiO₂ had the highest catalytic activity. Degradation ratio of RhB by EP-nanoTiO₂ (modified three times) under irradiation for 6 h were 98.0%, 75.6% and 63.2% for 10 mg/L, 20 mg/L and 30 mg/L, respectively.The photocatalyst activity has little change after the five times recycling, and the degradation rate of RhB decreased less than 8%. The reaction of photocatalysis for RhB with irradiation time can be expressed as first-order kinetic mode within the initial concentration range of RhB between 10mg/L and 30 mg/L. EP-nanoTiO₂ photocatalyst has a higher activity and stability to degrade RhB in aqueous solution.

Abstract: Different environmental remediation materials were prepared by using Cetyltrimethylammonium Bromide (CTMAB) and/or TiO₂ to surface-modify expanded perlite (EP). Photocatalytic degradation of Methyl Orange in polluted water by these materials (CTMAB-EP, TiO₂/CTMAB-EP, TiO₂-EP and EP), adsorption/ degradation kinetics and relevant factors affecting degradation effects were studied. The results showed that EP had little ability to remove Methyl Orange in water, while EP modified with CTMAB and/or TiO₂ could remove Methyl Orange (MO) significantly, and TiO₂/CTMAB-EP treatment showed the highest removal rate in all treatments. Removal effects of the materials were influenced by dosage of material, shaking time and initial concentration of MO in water. These results indicated that nanoTiO₂/CTMAB-Expanded perlite can be used as a new and promising environmental remediation material in efficient removal of organic pollutant from environment.