巻号一覧
46 巻 (2019)
- 4 号 p. 155-
- 3 号 p. 97-
- 2 号 p. 61-
- 1 号 p. 1-
46 巻, 2 号
選択された号の論文の6件中1～6を表示しています
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2018年度日本熱測定学会奨励賞
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寺島 幸生2019 年 46 巻 2 号 p. 61-68
発行日: 2019/04/25
公開日: 2022/11/20
ジャーナル フリーWe have investigated the relationship between the thermodynamic and kinetic properties of the glass transition and solvation structure for simple amine and alcohol solutions of inorganic salts by using differential-scanning calorimetry (DSC) and Raman spectroscopy. Although the glass transition temperature (Tg) increases with the addition of salts in common, the concentration dependence of the heat-capacity change ( ΔCp) at Tg and the kinetic fragility index (m) are quite different for the amine and alcohol solutions. The thermodynamic and kinetic properties depend more strongly on the solvents than on the solutes. From Raman results, the structural-breaking effect of adding ions on the hydrogen-bonding structure is found to be quite different between the amine and alcohol solutions. By comparing the DSC data with the Raman results, we suggest that the glass-transition thermodynamics and kinetics are controlled mainly by the strength or stability of hydrogen-bond structures and the properties of dominant intermolecular interactions in the solutions.抄録全体を表示PDF形式でダウンロード (891K)
解説
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中村 雅一, 小島 広孝2019 年 46 巻 2 号 p. 69-75
発行日: 2019/04/25
公開日: 2022/11/20
ジャーナル フリーUpon using thermoelectric generators (TEGs) as an energy harvester for wearable or room ambient electronics, mechanical flexibility, lightness, and low thermal conductivity are major issues. Because natural air cooling is assumed for such applications, very low thermal conductivity and millimeter thicknesses are required to obtain sufficient temperature difference between the front and back sides of the TEG. In this repot, two approaches in the authors' group are introduced. The first one is a novel device structure and fabrication method using CNT yarn with p/n doping and a fabric substrate. It is highly durable against bending or stretching because of the mechanical isolation of the thermoelectric components from the substrate. A key issue is how to suppress the high thermal conductivity of CNTs. A protein molecule is used as a gate for the phonon propagation and as a tunneling junction for electrons. The second one is to use molecular solids of organic semiconductors. Giant Seebeck coefficients, > 0.1 V/K, are found to appear in such materials near room temperature range. Owing to the extremely large Seebeck coefficient, the device structure can be ultimate simple without connecting many p/n semiconductor blocks as in conventional TEGs.抄録全体を表示PDF形式でダウンロード (2743K) -
玉井 伸岳, 後藤 優樹, 松木 均2019 年 46 巻 2 号 p. 76-80
発行日: 2019/04/25
公開日: 2022/11/20
ジャーナル フリーPressure perturbation calorimetry (PPC) is a novel calorimetric technique which allows us to obtain information about volumetric properties of solute molecules and colloidal particles in aqueous solutions. A PPC calorimeter has basically the same architecture as a high-sensitivity power-compensation differential scanning calorimeter, but it can measure the heat quantity transferred from or into a sample solution during the course of an isothermal small pressure change by attaching an external accessary for pressure control to the calorimeter. This heat quantity can be related to the expansion coefficient α, and thus, the temperature dependence of α can be obtained by performing PPC scans at a series of different temperatures. This article describes the application of PPC to the investigation of volume behavior of phospholipid bilayer membranes on the basis of our previous studies along with the general thermodynamic background of the PPC technique. We also give a concise explanation of how to analyze the PPC data, because we modified the conventional data analysis method to evaluate the absolute values of volume changes with bilayer phase transitions.抄録全体を表示PDF形式でダウンロード (1031K) -
田中 晶善2019 年 46 巻 2 号 p. 81-86
発行日: 2019/04/25
公開日: 2022/11/20
ジャーナル フリーThe starch-binding domain (SBD) of glucoamylase from Aspergillus niger consists of 110 amino acid residues. There is one disulfide bond, between Cys3 and Cys98. This article summarizes the thermodynamic and kinetic effects of the disulfide bond on the stability and structure of SBD as determined by calorimetric and spectroscopic studies of wild-type SBD and two disulfide-deficient mutants. Deletion of the disulfide bond did not change the native-state structure or the binding ability of SBD with β-cyclodextrin, a substrate analog. Rather, the disulfide bond stabilized the protein mainly by reducing the entropy of the unfolded state. In addition, the disulfide bond prevented SBD from forming a native-like and kinetically-trapped intermediate state. This possibly misfolded intermediate state was formed when the disulfide-deficient mutants were rapidly cooled from a high temperature, and had a long half-life of 11 h at 5 °C. The binding parameters of the native and intermediate states with β-cyclodextrin were essentially the same.抄録全体を表示PDF形式でダウンロード (1215K)
フロギストン
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2019 年 46 巻 2 号 p. 87-88
発行日: 2019/04/25
公開日: 2022/11/20
ジャーナル フリーPDF形式でダウンロード (647K)
チュートリアル
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吉田 博久2019 年 46 巻 2 号 p. 89-91
発行日: 2019/04/25
公開日: 2022/11/20
ジャーナル フリーPDF形式でダウンロード (1357K)
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