Newly developed holder for a right-angled metal venous cannula

A newly developed holder for a right-angled metal venous cannula was developed to make direct insertion into each cava easier, especially insertion into the superior vena cava in pediatric open heart operations. We have been using this holder with ease and safety in all cases of small babies.     

Strong Band Bowing Effects and Distinctive Optoelectronic Properties of 2H and 1T′ Phase‐Tunable MoxRe1–xS2 Alloys

Structure and energy band engineering of 2D materials via selective doping or phase modulation provide a significant opportunity to design them for optoelectronic devices. Here, the synthesis of high‐quality Mo_xRe_1–xS₂ alloys with tunable composition and phase structure via chemical vapor deposition growth is reported, and their novel energy band structures and optoelectronic properties are explored. The phase separation and structure reconstruction, which are found to be two serious problems in the synthesis of these alloys, are successfully suppressed through tuning their growth thermodynamics. As a result, the obtained Mo_xRe_1–xS₂ alloys have uniform composition, phase structure, and crystal orientation. Together with X‐ray photoelectron spectroscopy analysis and first‐principle calculation, the Re/Mo doping‐induced Fermi level up‐shift/down‐shift, new electronic states, and “sub‐gap” formation in Mo_xRe_1–xS₂ alloys are revealed. Especially, a strong band bowing effect is discovered in the Mo_xRe_1–xS₂ alloys with structure transition between 1T′ and 2H phases. Furthermore, these alloys reveal tunable conduction behavior from n‐type to bipolar and p‐type in 1T′ phase, as well as novel “bipolar‐like” electron conduction behavior in 2H alloys. The results highlight the unique alloying effects, which do not exist in the single‐phase 2D alloys, and provide the feasibility for potential applications in building novel electronic and optoelectronic devices.     

Chiral-angle distribution for separated single-walled carbon nanotubes

Chiral indices (n, m) of metallic and semiconducting single-walled carbon nanotubes (SWNTs) selectively separated via the density-gradient ultracentrifugation process were individually assigned by using an aberration-corrected transmission electron microscope (TEM) operated at 80 kV. Our statistical analysis revealed that armchair (n, n) and chiral (n, n-3) SWNTs with large chiral angles (>20 degrees) are dominant metallic nanotubes in the separated samples, whereas such a noticeable preference of particular indices was not observed for semiconducting nanotubes. Some significant discrepancies were found between the TEM and spectroscopic results on the major chiral indices and the metal/semiconductor ratios in these SWNTs.     

Support Effect of Metal Oxide on Rh Catalysts in the CH4-CO2 Reforming Reaction

Rhodium supported on various metal oxides was studied in the dry reforming reaction using methane and carbon dioxide, in order to reveal the effect of support on the catalytic activity of Rh. The TOF (turnover frequency) based on exposed Rh decreased in the following sequence of support: TiO₂ > La₂O₃ = CeO₂ > ZrO₂ = MgO = SiO₂ = MCM-41 > -Al₂O₃. The different TOF could be correlated with the stabilized species of Rh atom. It was concluded that the supports influenced the electronic state of Rh atoms, and that Rh metal catalyzed this reaction as a prominent active species.     

High-Temperature Fatigue Strength of Crack-Healed Al2O3 Toughened by SiC Whiskers

Al₂O₃ reinforced by SiC whiskers (Al₂O₃/SiC-W) was hot-pressed to investigate the fatigue strength of crack-healed specimens at high temperature. Semielliptical surface cracks of 100 μm surface length were introduced on each specimen surface. These specimens were crack-healed at 1300°C for 1 h in air, and static and cyclic fatigue strengths were systematically investigated at room temperature, 900° and 1100°C by three-point bending. The static and cyclic fatigue limits of the crack-healed specimens were more than 70% of the average bending strength at each testing temperature. Crack-healed specimens of Al₂O₃/SiC-W were not sensitive to static and cyclic fatigue at room temperature and high temperatures. Therefore, the combination of crack-healing and whisker reinforcement can play an important role in increasing static and cyclic fatigue strengths at high temperature.     

Photobrightening of photodarkened CdS- and CdSxSe1 − x-doped glasses

Photobrightening of photodarkened CdS- and CdS _x Se_{1 – x} -doped glasses was investigated using luminescence and electron spin resonance (ESR). Photobrightening depends on wavelength of laser light, and it is observed in all samples investigated, when wavelength of laser light is longer than that of absorption edge. Photobrightening depends on glass composition.