Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
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Volume 33, Issue 2
Displaying 1-6 of 6 articles from this issue
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  • Microscopic Two-Dimensional Thermal Analysis by a High-Speed Infrared Focal Plane Array
    Toshimasa Hashimoto, Junko Morikawa
    2006 Volume 33 Issue 2 Pages 58-65
    Published: March 31, 2006
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.33.58
    JOURNAL FREE ACCESS
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    A new experimental technique by a high-speed infrared focal plane array (IR camera) is proposed for the microscopic two-dimensional visual thermal analysis and the method for the measurement of thermal diffusivity in a plane. The advantages of this technique are; (i) highspeed, (ii) non-contact sensing, (iii) two-dimensional (2D) image and (iv) micro-scale spatial resolution. The two-dimensional high speed image of temperature distribution at a microscopic level is taken in a heating/cooling temperature scan and the temperature-time profiles of 65, 000 picture elements are obtained at the same time. The potentials for the observation of instantaneous latent heat and the phase shift measurement with a. c. technique are reviewed.
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  • Synthesis of Large Amount of Negative Thermal Expansion Oxide and Application to Controlling the Thermal Expansion of Materials
    Takuya Hashimoto, Yuhko Morito
    2006 Volume 33 Issue 2 Pages 66-73
    Published: March 31, 2006
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.33.66
    JOURNAL FREE ACCESS
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    Preparation method for large amount of negative thermal expansion oxide, ZrW2O8, with high purity has been developed. From TG-DTA data of ZrO2 and WO3 mixture, it was revealed that heat-treatment at 1200°C and successive rapid quenching to room temperature is necessary for preparation of ZrW2O8 by solid state reaction of ZrO2 and WO3. Employing Pt crucible covered with Pt plate, large ZrW2O8 ceramic with high density could be synthesized although press process using mold was not employed. Using quenching process of melt prepared with heating ZrW2O8 powder above melting point determined by TG-DTA measurement, the specimen with high density and negative thermal expansion could be prepared. The specimen was composed of ZrW2O8 grains with 10∼25μm diameter and ZrO2 or WO3 ones with ∼1μm diameter, to which smaller negative thermal expansion of the specimen than that of ZrW2O8 ceramic could be ascribed. Materials with tailored thermal expansion coefficient have been prepared by intentional hybridization at optimum ratio of ZrO2 and ZrW2O8 with cosintering. Using Al2O3 as sintering aid, density of the cosintered specimen increased due to generation of liquid phase of Al2(WO4)3 during sintering.
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  • Thermodynamics of Bilayer Phase Transitions of Phospholipids
    Hitoshi Matsuki, Shoji Kaneshina
    2006 Volume 33 Issue 2 Pages 74-82
    Published: March 31, 2006
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.33.74
    JOURNAL FREE ACCESS
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    Phospholipid bilayer membranes undergo various phase transitions depending on environmental factors such as temperature, pressure, salt concentration and so on. Although the differential scanning calorimetry (DSC) is especially effective in detecting the bilayer phase transitions, combination of the thermal information with results obtained from pressure measurements enables us to deepen a thermodynamic understanding of the bilayer transitions. Phase transitions of bilayer membranes formed by phospholipids, which are frequently used in studies of biological membranes, were explained and phase transition measurements under high pressure were introduced. Next the bilayer phase transitions for phosphatidylethanolamine homologues with different kinds of hydrophobic chains (degree of unsaturation in acyl chains) and different-sized polar head groups were taken up and the bilayer phase transitions were thermodynamically characterized in terms of pressure dependence of phase-transition temperatures, temperature-pressure phase diagrams and thermodynamic quantity changes associated with phase transitions.
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  • Calorimetric Analysis of the Formation and the Thermal Response of β2 Microglobulin Amyloid Fibril
    Kenji Sasahara, Yuji Goto
    2006 Volume 33 Issue 2 Pages 83-88
    Published: March 31, 2006
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.33.83
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    Amyloid fibril deposition is associated with over 20 degenerative human diseases, including Alzheimer's, Parkinson's, and prion diseases. Although research over the last few years has revealed the morphology and structural features of amyloid fibrils, knowledge about the thermodynamics of amyloid fibril formation and its thermal unfolding is limited. First, we describe the thermodynamic studies of β2 microglobulin amyloid formation by means of isothermal titration calorimeter. Then, we outline the unique thermal response of its mature amyloid fibrils in comparison with the thermal unfolding of the native form.
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  • [title in Japanese]
    2006 Volume 33 Issue 2 Pages 89-91
    Published: March 31, 2006
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.33.89
    JOURNAL FREE ACCESS
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  • Erratum to : Phase Transition of Lipids in Overwintering Insects
    2006 Volume 33 Issue 2 Pages 93
    Published: 2006
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.33.93
    JOURNAL FREE ACCESS
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