Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
Search
Advanced search
OR
Browse
Search
Volume 42, Issue 4
Displaying 1-5 of 5 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
Review
  • Development of a Top-Loading Type Adiabatic Calorimeter with a Refrigerator
    Itaru Tsukushi, Eri Nishiyama, Jun Fujimura, Marika Yokota
    2015 Volume 42 Issue 4 Pages 130-134
    Published: October 30, 2015
    Released on J-STAGE: November 20, 2022
    DOIhttps://doi.org/10.11311/jscta.42.4_130
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    We have developed a top-loading type adiabatic calorimeter with a refrigerator, which works in the temperature range 20–300 K. This calorimeter has following four features, 1) no uses liquid nitrogen and liquid helium for refrigerant, 2) enables us to measure the heat capacities and enthalpy relaxations under stable state for a long time at lower temperature region ( < 77 K: liquid nitrogen temperature), 3) reduces the time required for the sample setup (within ~ 10 min) 4) enables us to set up samples at liquid nitrogen temperature (77 K). The heat capacity of an empty cell was measured in a test experiment. The imprecision of the heat capacity measurement was ±0.8 % at 20–30 K, ±0.4 % at 30–120 K, and ±0.2 % at above 120 K in the present.
    View full abstract
    Download PDF (2005K)
  • Recent Development of Theory of the Glass Transition
    Kunimasa Miyazaki, Misaki Ozawa, Atsushi Ikeda
    2015 Volume 42 Issue 4 Pages 135-141
    Published: October 30, 2015
    Released on J-STAGE: November 20, 2022
    DOIhttps://doi.org/10.11311/jscta.42.4_135
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The nature of the glass transition of supercooled liquids is still surrounded by controversy. The current status of theoretical understanding of the transition is much more like that before the Currie-Weiss theory for critical phenomena in a sense that the full-fledged mean field theory is still not at hand. This, however, does not mean that we suffer from (literally glass-like) stagnancy in the progress. Contrarily, we witness a revolutionary development of the mean-field description of the slow dynamics near the transition escorted by the bona fide thermodynamic transition at a finite temperature. In this review, we start with the introductory discourse of the phenomenology of the glass transition and outline the whole picture of the glass transition which the contemporary version of the mean-field theory envisions. Furthermore, we present the results of our recent numerical study for a randomly pinned liquid, which strongly support the mean-field scenario. This is the first time forever that the true glass state with thermodynamic singularity has been generated in silico.
    View full abstract
    Download PDF (1658K)
  • A New Phase Transition and Involved Structural Change of Confined Cyclohexane
    Soichi Tatsumi, Taku Uehara, Masaharu Oguni
    2015 Volume 42 Issue 4 Pages 142-147
    Published: October 30, 2015
    Released on J-STAGE: November 20, 2022
    DOIhttps://doi.org/10.11311/jscta.42.4_142
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    We found by adiabatic calorimetric and X-ray powder diffraction measurements that cyclohexane confined into pores with a diameter of nm scale exhibits first order phase transition of a new type at 154 K. Emergence of the 1st order transition was restricted only to pores whose diameter was smaller than 3.0 nm, the transition temperature was independent of the pore sizes of confinement, and the transition enthalpy revealed a peak at around the diameter of 2.5 nm. These imply this transition is a liquid-liquid transition. Temperature dependence of X-ray diffraction intensities indicated development of a structural correlation around 0.3 nm at lower temperatures in accompany with the transition: This is consistent with the calorimetric findings.
    View full abstract
    Download PDF (1604K)
  • Hyperthermia Effect by AC Magnetic Susceptibility and Heat Dissipation of Magnetic Nanoparticles
    Yuko Ichiyanagi
    2015 Volume 42 Issue 4 Pages 148-152
    Published: October 30, 2015
    Released on J-STAGE: November 20, 2022
    DOIhttps://doi.org/10.11311/jscta.42.4_148
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    We have proposed magnetic hyperthermia treatment using our magnetic nanoparticles. Hyperthermia treatment is one of cancer therapy using heat effect. Mn-Zn ferrite, Mn1-xZnxFe2O4 nanoparticles encapsulated in amorphous SiO2 were prepared using our original wet chemical method. X-ray diffraction patterns confirmed that the diameters of these particles were within 7–30 nm. Magnetization measurements for various sample compositions revealed that the saturation magnetization (Ms) of 7 nm particles was maximum for the x = 0.2 sample. AC magnetic susceptibility measurements were performed for Mn0.8Zn0.2Fe2O4 (x = 0.2) samples with 13–30 nm particles. The peak of the imaginary part of the magnetic susceptibility χ” shifted to higher temperatures as the particle size increased. From the result of AC magnetic measurements, sample of 18 nm would exhibit highest temperature increase. Measurement system of heating samples by AC field was constructed and observed temperature increase. An AC field was found to cause the increase in highest temperature with the 18 nm particles as expected. Finally, in vitro experiments were carried out to study the hyperthermia effects of Mn1-xZnxFe2O4 (x = 0.2, 18 nm) particles on human cancer cells.
    View full abstract
    Download PDF (1439K)
Help Keywords
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top