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Preparation of IrO2 Thin Films by MOCVD Using Ir(EtCp)(CHD)
H. Fujisawa,S. Watari,H. Niu,M. Shimizu,N. Oshima 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
We report on MOCVD of IrO2 thin lms by using liquid Ir precursor, Ir(EtCp)(CHD). IrO2 lms were successfully grown on SiO2/Si, Ti/SiO2/Si and Pb(Zr,Ti)O3/Pt/SiO2/Si at 400C and oxygen concentration of as high as 77 %. IrO2 lms prepared on SiO2/Si with and without surfaceoxidizedIr seeds exhibited an electrical resistivity of 103 cm, and a root-mean-square surface roughness of 5 nm. IrO2 lms showed step coverages of 40-50%on SiO2-stepped substrate with L/S (line and space) of 0.7/3.6 and 1.4/2.9 m.
Constraints on GUT 7-brane topology in F-theory
Hayashi, H.,Kawano, T.,Watari, T. North-Holland Pub. Co 2012 Physics letters: B Vol.708 No.1
We study the relation between phenomenological requirements and the topology of the surfaces that GUT 7-branes wrap in F-theory compactifications. In addition to the exotic matter free condition in the hypercharge flux scenario of SU(5)<SUB>GUT</SUB> breaking, we analyze a new condition that comes from a discrete symmetry aligning the contributions to low-energy Yukawa matrices from a number of codimension-three singularity points. We see that the exotic matter free condition excludes Hirzebruch surfaces (except F<SUB>0</SUB>) as the GUT surface, correcting an existing proof in the literature. We further find that the discrete symmetry for the alignment of the Yukawa matrices excludes del Pezzo surfaces and a rational elliptic surface as the GUT surface. Therefore, some GUT 7-brane surfaces are good for some phenomenological requirements, but sometimes not for others, and this aspect should be kept in mind in geometry search in F-theory compactifications.
Effects of Elastic Behaviours of Dies and Servo Press Machine on Deep Drawing Process
A. Watanabe,Y. Kotani,K. Nishimura,H. Watari,T. Yamazaki 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Various characteristic features of elastic deformation of dies and presses during deep drawing were presented. It was very important to examine the effects of elastic deformation of these units on product accuracy. Strains were measured on the press system including dies, a slide and a bolster of a servo press. A strain magnitude of 63 ×10<SUP>-6</SUP> was obtained when the overall slide position was at the lowest point. Two slide motions of the servo press were selected to determine appropriate manufacturing conditions. An elastic deformation analysis of the die structure was then required by CAD simulation. To find the appropriate die structure model, the vertical displacement of the die structure in the CAD simulation only was compared to the experiment results. It was found that the vertical displacement of the die structure was 0.176 mm at the top surface of the die considering elastic deformation of the die structure as well as the bolster of the servo press.
Bai, Y.,Park, I.S.,Lee, S.J.,Bae, T.S.,Watari, F.,Uo, M.,Lee, M.H. Pergamon Press ; Elsevier Science Ltd 2011 Carbon Vol.49 No.11
The dispersing power of different surfactant-modified multiwalled carbon nanotubes (MWCNTs) and their effect on the antibacterial activity were examined. Three surfactants, including hexadecyltrimethylammonium bromide (CTAB), triton X-100 (TX-100) and sodium dodecyl sulfate (SDS) were tested. UV-vis absorbance, transmission electron microscopy and Fourier transform infrared spectroscopy were used to characterize the dispersion of MWCNTs in the aqueous phase, showing that the surfactant molecules had been adsorbed onto the MWCNTs' surface. Among the three surfactants, TX-100 and CTAB provided maximum and minimum dispersion, respectively. The surfactant-modified MWCNTs exhibited different antibacterial activities to Streptococcus mutans. The fluorescence images showed that the surfactant-modified MWCNTs were not only capable of capturing bacteria and forming cell aggregates, but also killing them. Under the same concentration and treatment time, the CTAB-modified MWCNTs exhibited the strongest antibacterial activity compared to the TX-100 and SDS-modified MWCNTs. The optical density growth curves and viable cell number determined by the plating method suggested that the antibacterial activity of all surfactant-modified MWCNTs was both concentration- and treatment time-dependent.
Electrophoretic deposition of carbon nanotubes-hydroxyapatite nanocomposites on titanium substrate
Bai, Y.,Neupane, M.P.,Park, I.S.,Lee, M.H.,Bae, T.S.,Watari, F.,Uo, M. Elsevier 2010 Materials Science and Engineering C Vol.30 No.7
Carbon nanotubes-hydroxyapatite (CNTs-HA) composites were synthesized, using an in situ chemical method and characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). HA particles were uniformly absorbed on the CNTs, with strong interfacial bonding. The CNTs-HA composites behaved like single composites when deposited on a titanium substrate by electrophoretic deposition (EPD). EPD was carried out at 10, 20 and 40V, for 0.5 to 8min at each voltage. Coating efficiency and weight increased with increasing deposition time, while the slope of the curves decreased, indicating a decrease in deposition rate. The CNTs-HA coating morphology was analyzed with scanning electron microscopy (SEM). The results revealed that decreasing the voltage used for deposition coatings could reduce cracking frequency. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) studies showed that the deposition coatings protected the titanium substrate from corroding in simulated body fluid (SBF). In addition, in vitro cellular responses to the CNTs-HA coatings were assessed to investigate the proliferation and morphology of osteoblast cell line.