Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
Search
Advanced search
OR
Browse
Search
Volume 36, Issue 4
Displaying 1-6 of 6 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
Preface
JSCTA Research Encouragement Award 2008
  • Exploration of Novel Electronic and Magnetic Phase Diagrams in Transition Metal Oxides by Heat Capacity Measurements
    Makoto Tachibana
    2009 Volume 36 Issue 4 Pages 189-196
    Published: June 30, 2009
    Released on J-STAGE: November 20, 2022
    DOIhttps://doi.org/10.11311/jscta.36.4_189
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Transition metal oxides with strong electron correlation show a variety of unusual properties. Establishing the electronic and magnetic phase diagrams as a function of composition and temperature is a first step in understanding their behavior, and sometimes a crucial step in discovering novel properties. This article reviews phase-diagram studies on RCoO3, RMnO3, RMn2O5, and Y2 －x BixRu2O7 (R ＝ rare earth), where heat capacity measurements were instrumental in identifying the phase transitions and understanding the complex properties. High-pressure synthesis and synchrotron powder x-ray structural analysis also played important roles in constructing and understanding the phase diagrams.
    View full abstract
    Download PDF (3579K)
Review
  • Thermodynamic Properties of Coordination Networked Compounds of Nanometer-Sized Magnets
    Yasuhiro Nakazawa, Satoshi Yamashita, Osamu Kubota
    2009 Volume 36 Issue 4 Pages 197-204
    Published: June 30, 2009
    Released on J-STAGE: November 20, 2022
    DOIhttps://doi.org/10.11311/jscta.36.4_197
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Low-temperature thermodynamic measurements of single crystals of a series of [Mn4] networked compounds were performed by the thermal relaxation technique and the ac technique. These materials are constructed by chemical linking of single-molecular magnet (SMM) clusters through coordination bonds and have an intermediate character of SMMs and usual bulk magnetic materials. Each cluster possesses an S ＝ 9 ground state with uniaxial anisotropy dominated by D/kB ＝ －0.4 ～0.5 K. Because of the existence of a superexchange interaction, J/kB, between neighboring SMMs, the long-range correlations of large and anisotropic spins have been realized. We have also observed a curious magnetic-field-induced glass-like freezing of spin correlations at low temperatures. The extremely sensitive thermodynamic behavior against the magnetic fields and external pressures were observed by the heat capacity measurements under pressures and with magnetic fields.
    View full abstract
    Download PDF (1111K)
  • Thermodynamic Analyses of Antibody-Antigen Interactions : Specificity and Affinity
    Kouhei Tsumoto, Mihoko Ui
    2009 Volume 36 Issue 4 Pages 205-215
    Published: June 30, 2009
    Released on J-STAGE: November 20, 2022
    DOIhttps://doi.org/10.11311/jscta.36.4_205
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Antibodies are widely used for various fields, including identification of targets, molecular imaging, diagnosis, and therapeutics. Fundamental understanding of interactions from thermodynamic viewpoints, based on structural information, is critical for rational design of antigen-specificity and affinity of antibody. Here, we would summarize our recent progresses on thermodynamic analyses of antibody-antigen interactions, and review the molecular mechanism for how an antibody can create the high specificity and affinity for its target, especially form thermodynamic and structural viewpoints.
    View full abstract
    Download PDF (2409K)
  • CO2 Absorption Property of Li-Metal Oxides
    Katsuyoshi Oh-ishi, Nobuaki Togashi, Takeshi Okumura, Yusuke Matsukura ...
    2009 Volume 36 Issue 4 Pages 224-231
    Published: June 30, 2009
    Released on J-STAGE: November 20, 2022
    DOIhttps://doi.org/10.11311/jscta.36.4_224
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Recently, technique of CO2 separation from exhaust mixture gases is desired as one of countermeasures against the environmental problems. Material used for the separation technique must be compact and can absorb CO2 quickly. Moreover it must be used repeatedly. From these requirements, Li-Metal oxides (typical example Li4SiO4) are regarded as a novel solid CO2 absorbent. Previously, we have investigated temperature dependence of CO2 absorption behavior of Li4SiO4, and studied on a method to measure reaction rate of CO2 absorption reaction of Li4SiO4 by means of a TG and DTA apparatus with an IR Gold image furnace. Furthermore, we have successfully synthesized new Li-Metal oxides Li4TiO4 and Li2CuO2, and measured their CO2 absorption behavior by means of the apparatus and the method. For three kinds of powdered samples (Li4SiO4, Li4TiO4, and Li2CuO2), CO2 absorption defined by “mass increase per sample gram” were measured by the apparatus when the samples were heated with the heating rate of 5 ℃ min －1. up to 1000 ℃ in 100 vol% CO2 atmosphere. It was found that the maximum CO2 absorption was measured 36.7 mass%, 42.1 mass%, and 40.2 mass%, respectively for Li4SiO4, Li4TiO4,and Li2CuO2. The maximum CO2 absorption of the Li4TiO4 sample was larger than those of Li4SiO4 and Li2CuO2. In order to measure rate constant k of CO2 absorption reaction for three samples, mass increase of the samples was measured with time at a measurement temperature in 100 vol% CO2 atmosphere. From the results, it was found that, in temperature region of 680 ℃～700 ℃, the rate constant k of the CO2 absorption for Li2CuO2 were almost three times larger than that of Li4SiO4 sample.
    View full abstract
    Download PDF (1285K)
Help Keywords
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top