All issues
Volume 34 (2007)
- Issue 5 Pages 194-
- Issue 4 Pages 152-
- Issue 3 Pages 104-
- Issue 2 Pages 60-
- Issue 1 Pages 2-
Volume 34, Issue 5
Displaying 1-8 of 8 articles from this issue
- |<
- <
- 1
- >
- >|
-
Minoru Ochi, Yoshie Matsutake, Kiyoshi Takeda2007 Volume 34 Issue 5 Pages 194-201
Published: November 15, 2007
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSThe glass transition temperatures for several hydrogen bonded mixtures have been presented to investigate the correlation between local structure and kinetic properties of supercooled and glassy liquids. The molar hydrogen bond nHB was utillized to estimate the composition dependence of hydrogen bond density in mixtures. The change in local structure in the present systems on mixing was discussed according to the correlation between concentration depencences of the glass transition temperature and nHB. The possibility for the formation of solvation structure caused by interaction analogous to hydrophobic interaction in acqueous solution was suggested for systems including N, N, N', N'-tetramethyl-1, 2-propanediamine.View full abstractDownload PDF (1703K) -
Naoko Matsuzaka, Hiroaki Kondo, Tomoko Watanabe, Yoshito Ohtake2007 Volume 34 Issue 5 Pages 202-205
Published: November 15, 2007
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSThermal diffusivity and thermal conductivity of natural rubber (NR) were measured by laser-flash method, and their vulcanizing density dependence was discussed. Thermal diffusivity and thermal conductivity of NR remarkably increased with appearance of higher-order structure by vulcanization. Furthermore, the positive correlation between thermal diffusivity or thermal conductivity of vulcanized NR and its vulcanizing density was foundView full abstractDownload PDF (783K) -
Masatsugu Oishi, Keiji Yashiro, Junichiro Mizusaki2007 Volume 34 Issue 5 Pages 206-213
Published: November 15, 2007
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSVarious properties of the metal oxides are strongly affected by the nonstoichiometry. Therefore, nonstoichiometry is very important for understanding the basic character of the metal oxides. Nonstoichiometry of the metal oxides is often measured by the gravimetric measurements at high temperature under controlled atmospheres. As the vapor pressure of the metal is negligibly small compared to the oxygen, the nonstoichiometry behavior of the metal oxides is often measured as a function of the oxygen partial pressure.
In this article, a brief review is made for the experimental technique of nonstoichiometry measurements by means of high temperature gravimetry under controlled gas-atmospheres: The oxygen nonstoichiometry is measured as the weight change at different oxygen partial pressures. The principle of the measurement is very simple. However, as the measurement is carried out at the equilibrium conditions at the high temperature under controlled oxygen partial pressures, and moreover, as the measurements often extend over a long period of time, the precision and long-time stability of the measuring system are important. Other important reminders will also be shown for the measurements procedure of the gas controlled high temperature microbalance.View full abstractDownload PDF (1996K) -
Yoji Maeda2007 Volume 34 Issue 5 Pages 214-222
Published: November 15, 2007
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSThere are two pressure dependences in the phase stability of the cubic phase of optically isotropic, thermotropic liquid crystals possessing linear molecular structures. In the first case, the cubic phase is destabilized by applying pressure, and finally disappears under high pressure, as seen in 4'-hexadecyloxy-3'-nitrobiphenyl-4-carboxylic acid ANBC(16), 1, 2-bis-(4-n-octyloxy-and 4-n-decyloxybenzoyl)hydrazine, BABH(8) and BABH(10). Triple point can be seen in their T-P phase diagrams, indicative of upper limit of pressure for the formation of the cubic phase. In the second case, the cubic phases are held stable under high pressure. The cubic phases of the 14PC5F polycatenar compound and EPABC liquid crystal belong to the second class. We introduce the experimental results of different phase behavior of these cubic phases under pressure.View full abstractDownload PDF (1714K) -
Sunyoung Jung, Hirohisa Yoshida2007 Volume 34 Issue 5 Pages 223-231
Published: November 15, 2007
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSThe mixing state of polymer blends including the blend with block copolymers were analyzed by “crystallization dynamics method” using DSC and DSC-FTIR methods. The nucleation rate (N*), the crystal growth rate (G*) and the growth rate of conformation (Gc*) of crystalline portion in blends were evaluated from the DSC endothermic peak and the absorbance change at a given wavenumber of IR spectra observed during the isothermal crystallization. The relationship between blend fraction and the chemical potential function evaluated from the degree of super-cooling at a given G* showed the interaction between polymers and the position of co-existence curve in the phase diagram. The relationship between G* and Gc* gave the concentration fluctuation of blend fraction in the partially miscible phase. The crystallization dynamics method evaluated the mixing state in the nano-meter scale phase formed by amphiphilic block copolymer blends.View full abstractDownload PDF (2516K) -
Mikhail V. Rekharsky, Yoshihisa Inoue2007 Volume 34 Issue 5 Pages 232-243
Published: November 15, 2007
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSRecently cucurbituril macrocycles attract much attention in supramolecular chemistry and have widely been used to build a variety of self-assembled nanostructures, devices, and architectures. Appropriate design of self-assembling processes requires detailed knowledge of the thermodynamics of cucurbituril complexation with various guest molecules. Despite the significant efforts devoted in recent years to the thermodynamic investigation of cucurbituril complexation, there still remain serious discrepancies in the literature data. In this review, we wish to discuss the recent achievements as well as the remaining problems in the area of complexation thermodynamics of cucurbituril.View full abstractDownload PDF (2199K) -
Makoto Suzuki, Takashi Miyazaki2007 Volume 34 Issue 5 Pages 244-250
Published: November 15, 2007
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSA precision microwave dielectric spectroscopic technique has been developed. This technique enables us to analyze hydration properties of ions, polymers, and proteins. φ-scan method gives an image of the information of spatial distribution of dielectric property of water surrounding protein molecules. Fixed φ analysis gives a direct comparison of hydration properties of different solutes. With this technique we analyzed the hydration states of alkali-halides aqueous solutions, charged polymers and proteins such as F-actin solutions. Most of solutes called water structure breakers form hyper-mobile water (HMW) layer around the solutes having higher dielectric relaxation frequency than bulk water. Thus, we may obtain further information of collective properties of water surrounding ions, polymers and biomolecules.View full abstractDownload PDF (1738K) -
2007 Volume 34 Issue 5 Pages 251-253
Published: November 15, 2007
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSDownload PDF (481K)
- |<
- <
- 1
- >
- >|