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ABSTRACT: We have investigated the orientation effect of silicon phthalocyanine dichloride evaporated on the highly oriented pyrolytic graphite (HOPG) surfaces using linearly polarized synchrotron radiation. Polarization angular dependences of Si 1s and Cl 1s near-edge X-ray absorption fine structure (NEXAFS) spectra were observed and compared with theoretical calculations based on equivalent core (Z + 1) approximation using the Hartree-Fock molecular orbital method. The calculated properties are in agreement with the experimental spectra in symmetry, intensity and energy position. The intensities for the lowest energy peaks observed at both Si and Cl edges are enhanced when X-ray electric field vector (E) is perpendicular to the surface. We assigned these peaks to out-of-plane transition into σz*(SiCl) final state orbital. We concluded that phthalocyanine plane is oriented parallel to the surface. Copyright © 2010 John Wiley & Sons, Ltd.
Surface and Interface Analysis 05/2010; 42(6‐7):863 - 868. · 1.18 Impact Factor
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ABSTRACT: For surface analyses of semiconductor devices and various functional materials, it has become indispensable to analyze valence states at nanometer scale due to the rapid developments of nanotechnology. Since a method for microscopic mapping dependent on the chemical bond states has not been established so far, we have developed a photoelectron emission microscopy (PEEM) system combined with synchrotron soft X-ray excitation. The samples investigated were Si/SiO(x) micro-patterns prepared by O(2)(+) ion implantation in Si(001) wafer using a mask. PEEM images excited by various photon energies around the Si K-edge were observed. The lateral spatial resolution of the system was about 41 nm. The brightness of each spot in PEEM images changed depending on the photon energy, due to the X-ray absorption intensity of the respective chemical state. Since the surface of this sample was topographically flat, it has been demonstrated that the present method can be applied to observations of the microscopic pattern, depending not on the morphology, but only on the valence states of silicon. We have also in-situ measured the changes of the PEEM images upon annealing, and elucidated the mechanism of the lateral diffusion of oxygen and valence states of silicon at the nanometer scale.
Analytical Sciences 01/2010; 26(8):835-40. · 1.25 Impact Factor
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ABSTRACT: We report a case of hepatitis C type liver cirrhosis with portal venous thrombosis in which danaparoid sodium was very effective.
The patient developed portal venous thrombosis, esophageal ulcer, and esophageal stenosis at the same time after sclerotherapy.
Since it was confirmed by abdominal computed tomography that there was no portal venous thrombosis before sclerotherapy, development
of the thrombosis was considered to be associated with sclerotherapy. The patient was treated with balloon dilation therapy
for esophageal stenosis, and with anticoagulation therapy using danaparoid sodium for portal venous thrombosis. The portal
venous thrombosis disappeared 4weeks after the treatment. Despite the condition of esophageal ulcer being caused by sclerotherapy,
the patient was safely treated without any adverse effects and complications, and the clinical course has been good. It was
indicated that danaparoid sodium was an anticoagulant unlikely to cause adverse effects such as hemorrhage and might be an
effective drug for treatment of portal venous thrombosis.
Clinical Journal of Gastroenterology 09/2008; 1(3):110-115.
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ABSTRACT: Molecular orientations of silicon phthalocyanine dichloride (SiPcCl2) thin films deposited on three different substrates have been measured by near-edge x-ray absorption fine structure (NEXAFS) spectroscopy using linearly polarized synchrotron radiation. The substrates investigated were highly oriented pyrolitic graphite (HOPG), polycrystalline gold and indium tin oxide (ITO). For thin films of about five monolayers, the polarization dependences of the Si K-edge NEXAFS spectra showed that the molecular planes of SiPcCl2 on three substrates were nearly parallel to the surface. Quantitative analyses of the polarization dependences revealed that the tilted angle on HOPG was only 2°, which is interpreted by the perfect flatness of the HOPG surface. On the other hand, the tilted angle on ITO was 26°. Atomic force microscopy (AFM) observation of the ITO surface showed that the periodicity of the horizontal roughness is of the order of a few nanometres, which is larger than the molecular size of SiPcCl2. It is concluded that the morphology of the top surface layer of the substrate affects the molecular orientation of SiPcCl2 molecules not only for mono-layered adsorbates but also for multi-layered thin films.
Journal of Physics Condensed Matter 04/2007; 19(19):196205. · 2.55 Impact Factor
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ABSTRACT: We report a case of hepatitis B type liver cirrhosis with portal venous thrombosis in which danaparoid sodium was very effective. The portal venous thrombosis in this case disappeared 2 weeks commencing after administration of danaparoid sodium. The patient had not adverse effects or complications such as hemorrhage, and the clinical course was good. We consider that danaparoid sodium is an anticoagulant unlikely to cause adverse effects such as hemorrhage, and that it might be effective for treatment of portal venous thrombosis. We intend to examine the indications of treatment with danaparoid sodium, clarify the best administration method, and establishment of maintenance therapy by investigating more cases.
Nippon Shokakibyo Gakkai zasshi The Japanese journal of gastro-enterology 03/2007; 104(2):205-12.
