熱測定
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
40 巻, 1 号
選択された号の論文の6件中1~6を表示しています
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解説
  • 齋藤 一弥
    2013 年 40 巻 1 号 p. 2-9
    発行日: 2013/01/25
    公開日: 2022/11/20
    ジャーナル フリー
    Through thermodynamic analyses of several liquid crystals (LCs) and related compounds, discussed are the roles played by alkyl chains attached to mesogenic cores. The roles identified include, i) an extension of molecular length, enhancing the shape anisotropy required for the formation of LCs by excluded volume effects, ii) an entropy reservoir, which, through the entropy term in Gibbs energy, stabilizes mesophases and governs the phase relation, and iii) intramolecular solvent (self-solvent), which induces micro-phase separated LCs including SmA phase. The last aspect opens the possibility that science and technology of thermotropic and lyotropic LCs be combined under the unified view of LCs. The implication of such a view on structures of layered LCs such as SmA phase is briefly discussed.
  • 藤代 史
    2013 年 40 巻 1 号 p. 10-16
    発行日: 2013/01/25
    公開日: 2022/11/20
    ジャーナル フリー
    Single phase specimen of polycrystalline Ba2Fe2O5, which has been a candidate for CO2 absorbents, was prepared by solid state reaction method under N2 flow. Ba2Fe2O5 showed weight increase above 450 °C under CO2 flow, which was originated from CO2 absorption. The weight decrease due to CO2 desorption was observed above 1100 °C under CO2 flow. Thermogravimetry (TG) and X-ray diffraction measurements have revealed that Ba2Fe2O5 can reversibly react with CO2, which is represented as Ba2Fe2O5 + CO2 ⇄ BaCO3 + BaFe2O4. Thermodynamic calculation of this reaction was carried out, showing agreement with the results obtained by TG measurements. The reaction kinetics of CO2 absorption by Ba2Fe2O5 was investigated by TG under various P(CO2)'s. The calculated Ellingham diagram of the reaction was found to show agreement with the variation in the equilibrium temperature of the reaction with P(CO2). The results of the morphology observation, specific surface area analysis and TG measurement suggested that CO2 absorption mechanism was described by a superficial reaction, a diffusion-controlled process, and a sintering reaction as the reaction proceeds. The kinetics of CO2 absorption for the diffusion-controlled process has been analyzed with the Jander function.
  • 井手本 康
    2013 年 40 巻 1 号 p. 17-22
    発行日: 2013/01/25
    公開日: 2022/11/20
    ジャーナル フリー
    We investigated the dependence of the thermodynamic stability, crystal structure, electronic structure and electrode characteristics on the heat treatment of Li1.00Mn0.5Ni0.5O2 as a cathode active material for Li secondary battery. Moreover, we investigated the relationship between the crystal structure, electronic structure, thermodynamic stability and cycle performance of LixMn1/3Co1/3Ni1/3O2, which obtained different synthetic process, and chemical delithiated samples. From these results, the correlation was found between the crystal and electronic structures, the thermodynamic stability and cycle performance. It was suggested that the structure and thermodynamic stability should provide an effective cycle performance.
  • 雨澤 浩史, 佐藤 一永, 橋田 俊之, 川田 達也
    2013 年 40 巻 1 号 p. 23-29
    発行日: 2013/01/25
    公開日: 2022/11/20
    ジャーナル フリー
    For ensuring mechanical durability and reliability of solid oxide fuel cells (SOFCs), precise evaluation of mechanical stresses in SOFC cells/stacks is necessary. In SOFCs under operation or fabrication, the components are exposed to high temperatures and specific oxygen potential conditions, and the local distributions of these conditions vary depending on the operation or fabrication condition. Changes in temperature and oxygen potential frequently lead to changes in crystal structure and oxygen nonstoichiometry, thus mechanical properties, of the SOFC component materials. Therefore, mechanical properties of the SOFC component materials are required to be evaluated at elevated temperatures while controlling oxygen potential. In this paper, results in our research group on in situ measurements of mechanical properties of SOFC component materials are reviewed.
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