Synthesis of Titanium Dioxide Nanocrystals with Controlled Crystal- and Micro-structures from Titanium Complexes

Selective synthesis of titanium dioxide (TiO2) polymorphs including anatase, rutile, brookite and TiO2(B) by solvothermal treatment of water-soluble titanium complexes is described with a special focus on their morphological control. The utilization of water-soluble titanium complexes as a raw material allowed us to employ various additives in the synthesis of TiO2. As a result, the selective synthesis of the polymorphs, as well as diverse morphological control, was achieved

Helicity Selection of the Cycloidal Order in Noncentrosymmetric EuIrGe3_3

The magnetic helicities of the cycloidal ordering in EuIrGe$_3$, with a noncentrosymmetric tetragonal structure, have been studied by circularly polarized resonant X-ray diffraction. It is shown that the helicity of each cycloidal domain is uniquely determined and satisfies the symmetry relations of the $C_{4v}$ point group of the crystal structure. The result shows that the cycloidal helicity is determined by the Dzyaloshinskii-Moriya type antisymmetric exchange interaction. The domain selection and the phase transition by the external magnetic field along [100] and [110] have also been studied. It is shown that the cycloidal plane prefers to be perpendicular to the field and the transverse conical state is realized.Comment: 6 pages, 4 figures, 5 figures in the supplemental material, accepted for publication in J. Phys. Soc. Jp

Pressure Effect on Transport Properties of EuNi(Si1-xGex)3 Compounds

AbstractThe compounds of EuNi(Si1−xGex)3 order antiferromagnetically. At the temperature TC below the Ńeel temperature TN, EuNiSi3 (x = 0) shows an additional magnetic transition into ferro-magnetic state. TN decreases monotonously with increasing the Ge composition x. The Curie temperature TC decreases rapidly with increasing x and vanishes at the critical composition x ≈ 0.3. We have measured the electrical resistivity and thermopower of EuNi(Si0.8Ge0.2)3, which is a compound near to the boundary between the ferromagnetic and antiferromagnetic ground states in the phase diagram for EuNi(Si1−xGex)3 system, under pressures up to 1.8GPa at temperatures from 2 to 300K. The anomalies in ρ(T) and S(T) curves of EuNi(Si0.8Ge0.2)3 are observed at TC = 16K and TN = 34K at ambient pressure. Both TC and TN increase linearly with increasing pressure. The temperature variations of ρ and S of EuNi(Si0.8Ge0.2)3 at P = 1.8GPa are almost the same as those of EuNi(Si0.9Ge0.1)3 (x=0.1) at ambient pressure, revealing that the effect of pressure on TN and TC is the same as that of the increase of Si concentration. The pressure and atomic composition dependences of the magnetic transition temperatures TN and TC can be expressed by using the Grüneisen parameters. These results indicate that the changes of TN and TC are attributed to the change of atomic volume induced by the applying pressure or the atomic substitution

Comparison of ESD and Conventional Methods in Single Cell Spray

Various inorganic ions are related to activity in a cell. Behavior of biological activity is traditionally observed by using optical microscope and/or MALDI. However, higher spatial resolution imaging technique is needed to observe organelles in a cell. In such cases, fixation in vacuum becomes quite big problem to maintain original structure in a cell. Rapid freezing seems one of the promising methods. But single cells cannot be treated as section. In this study, we devised a new rapid freezing method by combining electro-spray deposition and metal-touch freezing. In this method, individual cell is sprayed with a droplet emitted from the electro-spray tip, and each cells impact on the cooled metal surface, then frozen rapidly

SYNTHESIS OF PEROVSKITE-TYPE MULTICOMPONENT OXIDES BY POLYMERIZED COMPLEX METHOD

Perovskite-type multicomponent oxides such as BaTiO_3 and LaMnO_, have been synthesized by Polymerized Complex Method. Tetragonal BaTiO_3 with a small domain size formed at about 500℃ in air or 400℃ under O_2 flow. Throughout this process segregation of the individual metals was not observed. LaMnO_ powder with high surface area (>20m^2/g) was formed at about 500℃ in air or 350℃ under O2 flow