Ligand-free platinum nanoparticles encapsulated in a hollow porous carbon shell as a highly active heterogeneous hydrogenation catalyst.
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Journal Article↗
Biomedical subjects
Takao Sakata
Publications and source records attributed to Takao Sakata.
Synthesis and photophysical properties of EuS nanoparticles from the thermal reduction of novel Eu(III) complex.
EuS nanoparticles were synthesized by the thermal reduction of single source precursor (SSP), (PPh4)[Eu(S2CNEt2)4].2H2O, under microwave irradiation. The average size of the EuS nanoparticles was found to be 8 nm (3-16 nm in size). The organic products on the EuS surface were observed by using FT-IR, NMR, and MS analyses. We have found that these are resulted from the chemical reactions of SSP and cover the nanocrystal surface. A thermal reaction of SSP gave EuS nanoparticles and the organic product (*SCN(Et)2). The organic product would make a dimmer, (Et)2NC(S)-(S)CN(Et)2, by the couping of the radicals formed in the thermal reaction and/or thiopolymer in the solution through the polymerization of the radicals. The effective surface modification by the organic products led to protection of the EuS surface, resulting in the formation of the strongly luminescent EuS nanoparticles at room temperature (emission peak = 350 nm, fwhm = 58 nm, emission quantum yield = 27 +/- 5%).
Journal Article↗
Nonsustained wide QRS complex tachycardia: what is the mechanism?
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Adolescent↗
Porous polystyrene microspheres having dimpled surface structures prepared within micellar assemblies of amphiphilic silica particles in water.
Production of porous polystyrene microspheres having dimpled surface structures was demonstrated using amphiphilic and hydrophobic silica particles as structure-directing agents.
Journal Article↗
Asymmetrically modified silica particles: a simple particulate surfactant for stabilization of oil droplets in water.
Spherical silica particles that are able to assemble at a phase boundary of a dual-phase mixture of water and an immiscible organic solvent were prepared by a partial modification of their surface hydroxyl groups with an alkylsilylation agent. Scanning electron microscopic observation of these particles in which their remaining surface hydroxyl groups had been selectively modified with colloidal gold particles revealed that each particle has an asymmetric surface structure: one side of the surface is hydrophilic and the other is hydrophobic. We found that these particles could form a micellar structure in water in the presence of an organic solution of a toluene/polystyrene mixture. The micellar structure was evidenced by formation of golf-ball-like polystyrene particles with dimples imprinting morphologies of the hydrophobic part of modified silica particles.
Journal Article↗
[A case of CA19-9-positive retroperitoneal mucinous adenocarcinoma].
We report a case of retroperitoneal mucinous adenocarcinoma in a 44-year-old woman, who was admitted to our hospital complaining of low grade fever. Computed tomography and magnetic resonance imaging demonstrated a cystic tumor located at the lower pole of left kidney with irregular wall, which was enhanced by contrast medium. Open surgery was performed. Macroscopically, the tumor was clearly separated from the left kidney, and diagnosed as retroperitoneal in origin. Histopathological diagnosis was mucinous adenocarcinoma of retroperitoneum and immunohistochemical staining was positive for CA19-9, but not for CA125. The patient had no recurrence for 19 months post-operatively.
Adenocarcinoma, Mucinous↗