Advanced Materials Research Vols. 463-464

Abstract: In this paper an UV-curable character ink with high dispersion and stability was prepared based on acrylic resin, acrylic monomer, photo-initiator, pigment and other additives. The viscosity, particle size and surface tension of the ink were 18~22mPas, 310~330 nm and 22~25 mNm-1 at 25oC, respectively. These features showed the possibility to inkjet printing the ink on printed circuit board (PCB). Inkjet printing with high resolution can be achieved by varying the dried droplet diameter. Applied voltage and temperature during the jetting process influenced the diameter of dried droplet.

Abstract: In this paper, based on circular scanning configuration of photoacoustic tomography (PAT), we have tested the effects of the stepping angle of scanning and the relationship between the scanning range and the orientation of the absorber on the quality of the reconstructed image. The experiment results have shown that the reconstructed image would be influenced more by artifacts as the increase of the stepping angle of scanning, and for the limited-view scanning, while the relationship of the scanning path and the orientation of the absorber is parallel, compared with vertical, we can use the data got from less detecting position to reconstruct image clearly.

Abstract: In this paper, ultraviolet (UV) radiated grafting technique was introduced to the modifying of lithium-ion battery separator, and methyl methacrylate (MMA) grafted polyethylene separators were prepared through this technique to improve the affinity between the separator and liquid electrolyte, and thus improve the battery performance. Bulk photografting process was conducted, while solution grafting processes in petroleum ether, ethanol, acetone, and butyl acylate were conducted for comparison as well, the grafting degree could reach 49%. Infrared spectroscopy results showed that MMA could be efficiently grafted by UV radiation. Influence of photosensitizer concentration and radiation time was disscussed, and the morphology was observed in this paper as well.

Abstract: Critical optical techniques on visualization and extraction about needle marks have been developed based on the material properties of the speedometer. It has developed the multi-band waves and special image processing to do multi-spectral analysis on the suspected needle marks locations. The in-depth discussion has been taken especially for UV fluorescence traces, and alternatives have been established for multi-spectral laser with the multi-wavelength LED light source. Issues have been solved such as size and power consumption to meet the needs of image acquisition and processing. It should choose the right light waves based on the optical properties for various materials of the needle and the gauge plate.

Abstract: In this paper, we have inspected the structural morphology of novel composite materials - transition metal (TM) (Ni, Ti) / fullerene (C60) thin films, prepared at room temperature (RT) or 500°C, and modified by ion-irradiation and/or thermal annealing. The hybrid films were synthesized by alternative or simultaneous deposition of the immiscible TM and C60 phases. As deposited (at RT) the hybrid systems were thermodynamically unstable and the internal stress induced lengthy phase separation. Co-deposition at 500°C resulted in the formation of a large-scale pattern structure. By high temperature annealing of the multilayer’s a new morphology could be synthesized. In addition, high-fluence ion-irradiation induces C60 fragmentation that has a strong impact on the final shaping of the resulted morphology.

Abstract: The 3-D numerical model of wave tank is developed considering the effects of wave generating and absorbing based on viscous fluid motion differential equations (N-S equation) and the volume of fluid (VOF) method by the use of FLUENT solver. The simulation is also made by the analysis of the existing methods of wave simulation. The wave form of the 3-D wave tank is analyzed with the result of diverse diversification at different wave location and their relationship. The flow path of each particle of the wave during the propagation is also been analyzed, which provides guidance for the wave form analysis.

Abstract: The paper illuminates the designed automatic weld control system. The RAC calibration arithmetic considering radial distortion is introduced, and according to the actual conditions of this weld system, the inchoate rapid calibration arithmetic is designed. Finally combined with the precision characteristic of the non-linear RAC calibration arithmetic and the concision characteristic of the inchoate rapid arithmetic, the improved automatic calibration arithmetic with six parameters is proposed, which achieves satisfied result.

Abstract: The contribution deals with the design of a progressive metallurgical joining of the solar collector parts by brazing. The main aim was to replace flame brazing by the more advantageous technology of brazing using high-frequency induction heating. New equipment and the induction coil of a suitable shape were designed for the joint manufacturing. Based on the numerical simulations of electromagnetic and temperature fields, the basic parameters of induction brazing were suggested in order to achieve the desired temperature distribution at the spot of the future joint. To check the quality of the brazed joints, a leak test, optical microscopy and EDX microanalysis were used to study the area of the brazed joints interface. Impact of brazing time and power supply on brazeability of Al alloys components by means of the AlSi12 braze were assessed.

Abstract: Macroporous silicon was fabricated by electrochemical etching in hydrogen fluoride (HF) electrolyte on P-type silicon wafers. By optimizing the etching condition, the obtained macroporous silicon presented pore diameter of about 2 μm and pore density of ~10⁷/cm². Such macroporous silicon gave out an excellent antireflective performance with the reflectance lower than 4% in a wide spectral range of 400-1000 nm. An a-Si:H/c-Si heterojunction solar cell was fabricated on such macroporous silicon to show its application potential.

Abstract: Titanium dioxide thin films were deposited by DC reactive magnetron sputtering on silicon wafer and glass slide at sputtering power of 210 watt under total pressure of 5.0×10^-3 mbar at different oxygen partial pressure. A pure metallic titanium target was sputtered in a mixture of argon and oxygen gases. The crystal structure and surface morphology were characterized by X-ray diffraction (XRD) and atomic force microscopy (AFM), respectively. The optical transmission was measured by spectrophotometer. The results show that the crystalline was pure anatase structure titanium dioxide thin films. The surface morphology of the films is strongly the oxygen partial pressure. It was found that surface roughness of the thin films was around 2.42 to 4.82 nm and the thickness was around 72 to130 nm. In addition, it was found that all the titanium dioxide thin films were deposited by reactive sputtering with the different oxygen pressure exhibit the transparency property.