Advanced Materials Research Vol. 898

Abstract: The grinding liquid concentration has a great influence to its application and cost. Based on the tribological properties, viscosity, heat capacity, the research was conducted to find the performance of grinding fluid with difference concentration. Experimental results show that the grinding fluid can be chosen with low concentration in the process of cutting grinding. For the flat surface grinding and the cylindrical grinding, appropriate method is to give high grinding liquid concentration.

Abstract: In this paper, we give a second-order two-scale (SOTS) computational method for composite plate with 3-D periodic configuration under condition of coupled thermoelasticity by means of construction way. Based on the Reissner-Mindlin deformation pattern and integral projection operator of temperature, the homogenization solution is obtained. The SOTS's approximate solution is constructed by the cell functions and the homogenization solution. A set of numerical results are demonstrated for predicting the effective parameters, the displacement and temperature of composite plate. It shows that SOTS's method can capture the 3-D local behaviors caused by 3-D micro-structures well.

Abstract: Thin gold hollow half-shell nanostructured films are fabricated by deposited gold over regular arrays of polystyrene nanospheres on glass and silicon substrate respectively in an attempt to evaluate their optical properties and SERS activities. Scanning emission microscopy is used to topographically characterize the nanofilms. Optical spectra taken by UV-vis-NIR spectrometer show that the surface plasmon resonance wavelength of films fabricated on glass is shorter than that fabricated on silicon despite the nanoshell thickness is the same on both substrate, and the SERS intensity excited on silicon is stronger than that on glass because the nanofilms are so thin that the silicon can reflect the SERS signal and excited laser.

Abstract: We report a facile and efficient way to fabricate sensitive substrates for surface-enhanced Raman scattering (SERS) via sputtering Au nanoparticles on the surface of porous anodic aluminum oxide (AAO). This substrate could reduce the detection limit of Rhodamine 6G (R6G) to 10^-12 M. Moreover, it exhibits excellent reproducibility and the relative standard deviation value of SERS intensity at 616 cm^-1 is about 12%. More importantly, it can be scaled up for high-throughput production with low cost and large scale.

Abstract: In this paper, samples were prepared by power ultrasonic on molten Al ingot. The results show that microstructure of the samples treated by untrosonic vibration is more finer than that of the untreated ones, the ultrasonic treatment time is not the longer the better. When the vibration head dipped into the middle of the melton, the better grain refinement effect can be gotten. Too deep or too shallow of the vibration head dipped in, vibration effect just limited to near the head, the influence is relatively small when the melton far away from the vibration head.

Abstract: TiO₂/SnS₂ nanocomposite was synthesized via hydrothermal treatment of tin (IV) chloride pentahydrate, thioacetamide and TiO₂ nanotubes in deionized water at 150 °C for 3 h. The structure, composition and optical property of the as-synthesized nanocomposite were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, transmission electron microscopy and UV-vis diffuse reflectance spectra, and its photocatalytic property was tested in the reduction of aqueous Cr⁶⁺ under visible-light (λ > 420 nm) irradiation. It was observed that TiO₂ nanotubes exhibited no photocatalytic activity, whereas TiO₂/SnS₂ nanocomposite exhibited photocatalytic activity in the reduction of aqueous Cr⁶⁺ under visible-light (λ > 420 nm) irradiation.

Abstract: This paper studied the effect of the ratio between the axial tensile force and the transversal vibration loads on the fatigue behavior and failure mode of the near alpha titanium alloy TA11, to simulate the service stress state applied on the engine blades, where a large centrifugal force is superimposed with bending vibration loads. The plate-like specimens were used in the fatigue tests by a special testing device which was designed and fabricated in the present research,where the vibration loads were applied by the electro-magnetic exciters. By experiments under various multi-axial fatigue loading cases with different ratios between the axial tensile force and the transversal vibration loads, the fatigue behavior and failure modes were observed and compared. Then, the energy based fatigue criteria were applied for correlation of the test results. The fatigue properties of titanium alloy TA11 under the specialized loading conditions are characterized and discussed. In addition, the experimental observations on the vibration behavior superimposed with different magnitude of axial tensile force are also helpful for understanding the real working conditions of the engine blades.

Abstract: Na/Mg co-doped (Na,Mg):ZnO films were fabricated on pyrex glass substrates by sol-gel spin-coating method. Effects of annealing on properties of the films were particularly investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmittance spectra. The internal stress of the films annealed at different temperature was calculated. Experimental and analytical results show that some NaCl freeze-out derivatives will appear on films when the annealing temperature is too low, with the increasing annealing temperature, the c-axis tensile stress is sharply decreased first, then the c-axis stress was changed into press stress and its value is increased continuously, so the structural, surface and the optical properties of the films improve first and deteriorate afterwards.

Abstract: PCEC-CaO-SiO₂ hybrid material was synthesized by a two steps method. FTIR results proved the structure of the telechelic PCEC with triethoxysilane-propyl end groups synthesized in the first step. Then the PCEC-CaO-SiO₂ hybrid material was synthesized by Sol-gel method. The chemical link between the functionalized polymer and the organic components prevent the hybrid materials brittle crack. The compressive strength was increased with the inorganic contents increasing in the hybrid materials. The hydrophilic PEG contents of PCEC accelerate the hydroxyapatite deposition on the hybrid materials after it was soaked in the SBF for a period of time.