Preparation of Pyrochlore Ca 2 Ti 2 O 6 by Metal-Organic Chemical Vapor Deposition

Ca-Ti-O films were prepared by metal-organic chemical vapor deposition (MOCVD) using Ca(dpm) 2 and Ti(O-i-Pr) 2 (dpm) 2 precursors, and the effects of substrate temperature (T sub ) and Ca/Ti ratio (R Ca/Ti ) on the crystal structure and morphology were studied. Ca-Ti-O films consisting of pyrochlore Ca 2 Ti 2 O 6 and perovskite CaTiO 3 phase were obtained at T sub ¼ 1073 K and 0:35 < R Ca/Ti < 1. The content of pyrochlore Ca 2 Ti 2 O 6 increased with decreasing R Ca/Ti . Pyrochlore Ca 2 Ti 2 O 6 almost in a single phase was obtained at R Ca/Ti ¼ 0:46. The morphology of pyrochlore Ca 2 Ti 2 O 6 was agglomerated fine grains about 50 nm in diameter having a columnar texture

Intercellular Adhesive Structures Between Stellate Cells – An Analysis in Cultured Human Hepatic Stellate Cells

To investigate whether or not hepatic stellate cells can form intercellular junctions with each other, we cultured human stellate cells (LI90) on different kinds of substrata. Intercellular junctions were detected between these cultured stellate cells by transmission electron microscopy (TEM). The molecular components of the intercellular adhesive structures were identified by immunofluorescence microscopy. Immunofluorescence for cadherin and catenins was detected at the adhesion sites between the cultured stellate cells. Thus, the intercellular junctions were indicated to be adherens junctions at the molecular level. The junctions developed in the cultured stellate cells irrespective of the type of substratum. These data suggest that the junctional formation between the stellate cells occurs in vivo as well as in vitro

Intrinsic Visible Plasmonic Properties of Colloidal PtIn₂ Intermetallic Nanoparticles

コロイド状C1-PtIn2ナノ粒子による可視プラズモン特性の発現 --新規可視プラズモン材料としての金属間化合物ナノ粒子の設計指針--. 京都大学プレスリリース. 2024-01-12.Materials that intrinsically exhibit localized surface plasmon resonance (LSPR) in the visible region have been predominantly researched on nanoparticles (NPs) composed of coinage metals, namely Au, Ag, and Cu. Here, as a coinage metal-free intermetallic NPs, colloidal PtIn₂ NPs with a C1 (CaF₂-type) crystal structure are synthesized by the liquid phase method, which evidently exhibit LSPR at wavelengths similar to face-centered cubic (fcc)-Au NPs. Computational simulations pointed out differences in the electronic structure and photo-excited electron dynamics between C1-PtIn₂ and fcc-Au NPs; reduces interband transition and stronger screening with smaller number of bound d-electrons compare with fcc-Au are unique origins of the visible plasmonic nature of C1-PtIn₂ NPs. These results strongly indicate that the intermetallic NPs are expected to address the development of alternative plasmonic materials by tuning their crystal structure and composition