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Volume 15 (1988)
- Issue 4 Pages 147-
- Issue 3 Pages 97-
- Issue 2 Pages 59-
- Issue 1 Pages 2-
Volume 15, Issue 4
Displaying 1-8 of 8 articles from this issue
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Ryosaku Kadowaki, Hidekazu Touhara, Koichiro Nakanishi1988 Volume 15 Issue 4 Pages 147-151
Published: October 30, 1988
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSThe molar excess enthalpies for aqueous solutions of 2-butoxyethanol (BE) and 2-t-butoxyethanol (t-BE) have been measured at 298.15K over the whole concentration range with a flow microcalorimeter.
All the solutions exhibit negative enthalpies of mixing and the absolute values show |HE (t-BE)|>|HE(BE)|. The enthalpic pair interaction parameters hxx have been evaluated from the experimental data. All parameters hxx have large positive values, suggesting the strong hydrophobic interaction in these solutions. The hxx value of BE is larger than that of t-BE, which clearly indicates the orientation dependent contribution to the hydrophobic interaction.View full abstractDownload PDF (613K) -
Honoh Suzuki, Shin-ichi Ishiguro1988 Volume 15 Issue 4 Pages 152-157
Published: October 30, 1988
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSAn on-line controlled calorimeter has been devised and used for measuring heats of adduct formation of dimethyl sulfoxide (DMSO) with 2, 2, 2-trifluoroethanol (TFE) in 1, 2-dichloroethane (DCE) at 25°C. The observed heats were well explained in terms of the formation of two adducts, (dmso) (tfe) and (dmso) (tfe)2, and their formation constants and enthalpies were simultaneously determined. For the formation of the 1:1 adduct, the formation constant was appreciably smaller and the enthalpy was less negative in DCE than in CCl4, implying that DMSO is more strongly solvated in polar DCE than in nonpolar CCl4.View full abstractDownload PDF (840K) -
Hiroshi Yokota, Toshiya Kumagai, Susumu Mizuta1988 Volume 15 Issue 4 Pages 158-162
Published: October 30, 1988
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSPyrolyses of copper organic acid salts, i. e., caprylate, laurate, stearate and naphthenate, were studied in the temperature range of 25∼850°C in Ar or air flow by thermogravimetry (TG)-differential thermal analysis (DTA), infrared and X-ray analyses, Decomposition reaction of the salts followed by evaporation of the organic products were found to take place in the range of 200∼350°C in Ar, where the solid product was metal copper.
In the case of an air atmosphere, decomposition reaction with combustion of the organic products and simultaneous oxidation of metal copper were found to take place.
On the final stage in air, retardation of the pyrolysis with a large tailing of weight decrease curve was found, which was considered to be caused by a formation of dense layer of copper oxide on the surface of the specimen. During the pyrolysis process solid products were metal copper, cuprous and cupric oxides. Final product heated up to 850°C was found to be cupric oxide.View full abstractDownload PDF (762K) -
Yoshio Shibasaki1988 Volume 15 Issue 4 Pages 163-165
Published: October 30, 1988
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSMelting behavior of stearic acid, which contains a polar head group (COOH) at a end of long hydrocarbon chain, was investigated by the DSC measurement. It was found that heat of fusion increased up to two times of normal value, when the sample weight was smaller than 0.01mg, and melting temperature decreased 3∼5°C in the sample having smaller than 0.2∼0.3mg. The results can be attributed to the strong interaction between the oxidized surface layer of aluminium sample pan and the carboxyl group of stearic acid.View full abstractDownload PDF (327K) -
Tadafumi Koyama, Michio Yamawaki1988 Volume 15 Issue 4 Pages 166-171
Published: October 30, 1988
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSThe pronounced vaporization behavior of congruent vaporization is suggested to be somewhat contradictory looking because of the ambiguity of its definition. New definitions are introduced and the meaning of congruent vaporization composition (C. V. C.) and congruently effusing composition (C. E. C.) are explained in terms of thermodynamics. The difference between C. V. C. and C. E. C. is shown by using the experimental results of some refractory compounds.View full abstractDownload PDF (863K) -
Katsuyoshi Nishinari, Mineo Watase1988 Volume 15 Issue 4 Pages 172-184
Published: October 30, 1988
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSThermal Analysis of polysaccharides and proteins which are used to improve the functional properties of food has been carried out. DSC studies on gelatinization and retrogradation of starch, gel-sol transition of thermo-reversible gels such as gelatin, agarose and carrageenan, heat-gelation of egg white and some acidic proteins, denaturation of soy-bean protein, properties of water in starch and agarose are described.View full abstractDownload PDF (1705K) -
Low-Temperature Heat Capacities of Graphite-Intercalation Compounds and Their Solid State PropertiesToshiaki Enoki, Kazuya Suzuki1988 Volume 15 Issue 4 Pages 185-193
Published: October 30, 1988
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSGraphite is a layer compound, and charge transfer complexes are formed between graphite and donor or acceptor materials. These complexes are named as graphite intercalation compounds, where the guest materials are inserted between graphite layers. The graphite intercalaction compounds are metallic with two-dimensionality. The experimental studies of low-temperature heat capacities are presented to show the electronic structures and lattice vibrations in these compounds. The electronic specific heat of alkali-metal-graphite intercalation compounds is explained in terms of the charge-transfer between graphite and alkali metal. The lattice specific heats have the Debye and Einstein terms of lattice vibrations. In the alkali-metal-hydrogen-graphite ternary compounds, which are obtained by hydrogen uptake in alkali metal-graphite intercalation compounds, electronic specific heat is reduced as the increase of hydrogen concentration. This means that hydrogen with strong electron affinity reduces the concentration of conduction electrons on graphite and alkali-metal. The lattice bivration is modified by the presence of hydrogen. The heat capacity investigation suggests two-dimensionality of the electronic structure and lattice vibrations of acceptor graphite intercalation compounds. Magnetic specific heat is discussed for transition-metal-chloride-intercalated graphite.View full abstractDownload PDF (1395K) -
Akira Kouchi1988 Volume 15 Issue 4 Pages 194-199
Published: October 30, 1988
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSExperimental results of the measurement of vapour pressure of amorphous H2O(H2Oas), ice Ic and ice Ih are described. The vapour pressure of H2Oas is one or two orders of magnitude larger than those of ice Ic and ice Ih and depends greatly on the condensation temperature, Tc and the rate of condensation, R. When Tc is low and when R is small, the difference in vapour pressure between H2Oas and ice Ic is large. On the other hand, with increasing Tc and R the vapour pressure of H2Oas approaches that of ice Ic. Also the vapour pressure of ice Ic is slightly larger than that of ice Ih. We discuss the condensation and evaporation of H2Oas in space.View full abstractDownload PDF (950K)
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