巻号一覧
50 巻 (2023)
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50 巻, 1 号
熱測定
選択された号の論文の9件中1～9を表示しています
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巻頭言
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中澤 康浩2023 年 50 巻 1 号 p. 1
発行日: 2023/01/25
公開日: 2023/02/26
ジャーナル 認証ありPDF形式でダウンロード (250K)
特集 - 高圧力と熱測定・熱分析 -
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松木 均2023 年 50 巻 1 号 p. 2
発行日: 2023/01/25
公開日: 2023/02/26
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清水 克哉2023 年 50 巻 1 号 p. 3-6
発行日: 2023/01/25
公開日: 2023/02/26
ジャーナル 認証ありSuperconductors having critical temperatures close to room temperature under high pressure are reported recently. We can expect, if a room-temperature superconductor (RTS) is realized, it will greatly contribute to the future of mankind as a highly energy-saving and highly functional material. Removing the requirement of high pressure seems not easy. However, from a different point of view, the fact that RTS can exist even at high pressure is an important fact that led us to investigate further material synthesis and development. In this paper, the latest research themes under high pressure, not limited to RTS are reviewed.抄録全体を表示PDF形式でダウンロード (836K) -
谷口 尚2023 年 50 巻 1 号 p. 7-12
発行日: 2023/01/25
公開日: 2023/02/26
ジャーナル 認証ありBased on the generation of high pressure up to 10 GPa by using belt-type high pressure (HP) apparatus, technological development in the control of high temperatures (HT) up to 3200 °C was introduced. As a heat treatment effect under HP-HT up to about 3200 °C in the 2.5 GPa region, the two-dimensional turbostratic layer structure boron-carbon-nitride (BCN) was well crystalized into a-b and a-a’ stacked form was obtained. Heat treatment of high purity hexagonal boron nitride (hBN) with graphite above 2000 °C, carbon-doped hBN crystals with new color center were obtained. As an example of material synthesis by solid-phase reaction under HP, the thermophysical properties of cubic BN crystals, which are super-hard materials, were controlled. In terms of temperature dependence of thermal conductivity, concentration to boron (B) isotope of 10B or 11B increased nearly twice that of the natural isotope cBN, and a value close to that of diamond was obtained. Since these HP synthesis environments are single-shot batch processing, it is relatively easy to grasp the contamination components of the reaction system even above 2000 ℃. It is also emphasized that trial and error by combining various material systems, reaction control by sealing volatile components during synthesis, etc. are possible.抄録全体を表示PDF形式でダウンロード (1389K) -
長谷川 正, 浅野 秀斗, 張 仲景, 佐々木 拓也, 丹羽 健2023 年 50 巻 1 号 p. 13-19
発行日: 2023/01/25
公開日: 2023/02/26
ジャーナル 認証ありPressure is one of the thermodynamic parameters together with the temperature to control the stability of materials. Ultra-high pressure in more than GPa regions allows us to obtain novel transition metal nitrides. This review shows a synthesis system under ultra-high pressures and high temperatures called laser-heating diamond anvil cell system in the first part. Then, our recent research results of the first synthesis of a novel niobium nitride, U2S3-type Nb2N3 are described. In the second part, compression and thermal expansion behaviors of the U2S3-type Nb2N3 are shown and compared with each other. Besides, the high pressure in-situ XRD and low temperature in-situ XRD measurement systems in the Aichi Synchrotron Radiation Center (Aichi SR) are also described briefly.抄録全体を表示PDF形式でダウンロード (2033K) -
糀谷 浩2023 年 50 巻 1 号 p. 20-24
発行日: 2023/01/25
公開日: 2023/02/26
ジャーナル 認証ありMeasurement temperature ranges of isobaric heat capacities (CP) and thermal expansivities (α) of high-pressure stable materials such as Earth’s mantle minerals are usually limited due to breakdown of the crystal structures, back transformation to lower pressure phases or amorphization by heating at 1 atm. In this study, α and CP at 1 atm and high temperatures were theoretically calculated based on lattice vibrational information. Pressure dependences of vibrational frequencies of the mantle minerals were measured by high-pressure micro-Raman spectroscopy using a diamond anvil cell high-pressure apparatus. Thermal Grüneisen parameter (γth) was determined by weighted average of mode Grüneisen parameters derived from the pressure dependence of the vibrational frequencies. The obtained γth was applied to α calculation using the Grüneisen relation equation. Furthermore, CP was calculated by lattice vibrational model calculation using the Kieffer model, in which the obtained α was used to calculate anharmonic contribution. The calculated CP values show good agreement with the measured ones. The series of calculations of α and CP enables us to make reliable extrapolation of measured CP and α data to higher temperatures than maximum measurement temperature.抄録全体を表示PDF形式でダウンロード (905K) -
木村 佳文, 岡本 康孝, 柴 まいき, 藤井 香里2023 年 50 巻 1 号 p. 25-30
発行日: 2023年
公開日: 2023/02/26
ジャーナル 認証ありRaman spectroscopy has been applied to study the hydrogen-bonding donating and accepting abilities of supercritical alcohols and their mixtures with water. The hydrogen-bonding donating ability was evaluated by the Raman shift of C=O stretching vibration of benzophenone. The hydrogen-bonding accepting ability was evaluated by the Raman shift of NH2 stretching vibration of p-nitroaniline. The solvent density dependences of these two properties were similar to each other, and even near the critical density of the solvent, the solvent shows substantial hydrogen-bonding abilities. The effect of water, however, was opposite for these two cases. The addition of water strengthened the hydrogen-bonding donating ability of the solvent, while the addition of water weakened the hydrogen-bonding accepting ability of the solvent. Molecular dynamics simulation was performed to evaluate the hydrogen-bonding between pNA and solvent, and the selective solvation was discussed.抄録全体を表示PDF形式でダウンロード (1161K) -
加藤 稔, 山本 翼2023 年 50 巻 1 号 p. 31-35
発行日: 2023/01/25
公開日: 2023/02/26
ジャーナル 認証ありDespite the fact that proteins are important molecules involved in almost all life phenomena, the principles of thermodynamic stability, the most fundamental topic of protein research, have not been elucidated. In this review, we first describe the thermodynamic properties of temperature-dependent denaturation (thermal and cold denaturation) and outline the generally accepted model of the denaturation mechanism (Kauzmann model). Then, the thermodynamic properties of pressure denaturation and the pressure dependence of the Gibbs energy of dissolution of hydrocarbons in water are presented. Comparison of these shows that the Kauzmann model cannot explain pressure denaturation of proteins. Since Gibbs free energy is a function of temperature and pressure, a correct denaturation model must be able to account for both temperature and pressure denaturation without contradiction. The temperature-pressure axial energy landscape of denaturation is essential for constructing a true model. Finally, we describe some recent theoretical and experimental studies on pressure denaturation mechanisms that have been very influential in this research field.抄録全体を表示PDF形式でダウンロード (1078K)
フロギストン
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2023 年 50 巻 1 号 p. 36-38
発行日: 2023年
公開日: 2023/02/26
ジャーナル 認証ありPDF形式でダウンロード (375K)
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