首页期刊导航|Bulletin of the Chemical Society of Japan
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Bulletin of the Chemical Society of Japan
The Society
Bulletin of the Chemical Society of Japan

The Society

0009-2673

Bulletin of the Chemical Society of Japan/Journal Bulletin of the Chemical Society of JapanSCICCRAHCIEI
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    Direct Observation of Scattering Angle Dependence of the Inelasticity Effect on the Interference Term Obtained from Time-of-Flight Neutron Diffraction Experiments

    Kameda, YasuoTsutsui, KanaAmo, YukoUsuki, Takeshi...
    7页
    查看更多>>摘要：Scattering angle dependence has been experimentally examined for inelasticity effect on the intramolecular interference term observed from the time-of-flight neutron diffraction method. Internuclear distance and its root-mean-square displacement for liquid pure D2O, C6D6 and CCl4, have been determined from the least squares fitting analysis of the observed total interference term in the high-Q region. Although "apparent shrinkage" in the intramolecular distance has been observed obviously for the light nuclei pair at large scattering angle data (2 theta > ca. 70 degrees), it has been revealed that the apparent shrinkage in the D center dot center dot center dot D distance for D2O and C6D6, in which the inelasticity effect is expected to be most significant, is found to be suppressed well within ca. 1% for the data observed for the scattering angle below ca. 2 theta < ca. 50 degrees. Structural parameters determined have been compared with those determined from the gas-phase electron diffraction method in order to obtain insight of the effect of intermolecular interaction to molecular geometry in the liquid phase.
      原文链接:
    • NSTL
    • Chemical Soc Japan

    How to Design and Analyze Persistent Phosphors?

    Ueda, Jumpei
    15页
    查看更多>>摘要：Persistent phosphors show contentious luminescence even after ceasing excitation light. This unique phenomenon is caused by several processes such as carrier generation, trapping and detrapping. Based on the mechanism, persistent luminescence can be designed by controlling the carrier transportation. By utilizing the vacuum referred binding energy diagram of lanthanoid and transition metal ions for the prediction of the trap levels in host compounds, new persistent phosphors have been developed successfully. This design guides for persistent phosphors are introduced, and the analyzing methods for persistent phosphors are also explained.
      原文链接:
    • NSTL
    • Oxford Univ Press

    Carbonaceous Materials: The Beauty of Simplicity

    Lopez-Salas, NievesAntonietti, Markus
    7页
    查看更多>>摘要：The current mandates of a sustainable society and circular economy lead to the request that materials chemistry, but also chemistry as such, become significantly redesigned. Changes include the commonplace as the glassware we use, the minimization of wastes and side products or replacement strategies in the materials choice, among others. In this context, "carbons" are very versatile and already have found their place in a myriad of applications for a "carbon-neutral" society. They already take key enabling positions for sensors and biomaterials preparation, as energy conversion and storage electrodes, or as effluent remediation sorbents. Herein, we describe how carbon chemistry can be again re-designed to outperform benchmark materials in a number of fields, especially in energy storage, (electro)catalysis, as sorbents, but also in a new chemistry of the confined state.
      原文链接:
    • NSTL
    • Chemical Soc Japan

    Droplet Size and Coalescence Stability of n-Hexadecane Emulsions Homogenized in Aqueous Solution of Proteins before and after High-Energy Processes

    Kobayashi, EmiMasuda, TakeshiFukada, KazuhiroYoneda, Kohei...
    9页
    查看更多>>摘要：Properties of protein-based O/W emulsions are influenced by various factors including species and concentration of the protein, oil content, and employed homogenization technique, which make it difficult to establish suitable conditions to prepare stable emulsions. To address this issue, two proteins, bovine serum albumin (BSA) and ovalbumin (OVA), were used as emulsifiers in a wide concentration range to disperse n-hexadecane, and necessary conditions to prepare reasonably stable, submicron-size emulsions were explored. A two-step homogenization process, premixing with a rotor-stator mixer followed by either sonication or high-pressure homogenization, was employed, and volume-weighted average droplet diameter (d43), adsorption density of proteins (Gamma), and coalescence stability of oil droplets were measured. For sonicated emulsions in the emulsifier-rich regime, d(43) was ca. 1 mu m for both BSA and OVA, and G was ca. 2-3 mg m(-2) (over 15 mg m(-2)) for BSA (OVA). The high-pressure homogenization could reduce d(43) down to 0.4 mu m provided BSA (OVA) concentration was 5g L-1 (15 g L-1) or higher. These submicron-size emulsions were stable for several days only for BSA emulsions with the concentration >= 15 g L-1, otherwise coalescence proceeded. These results suggested that the adsorbed OVA films are more easily broken than the BSA films.
      原文链接:
    • NSTL
    • Chemical Soc Japan

    Electrochemical Sensing Applications Using Diamond Microelectrodes

    Ivandini, Tribidasari A.Einaga, Yasuaki
    10页
    查看更多>>摘要：The miniaturization of boron-doped diamond (BDD) electrodes is an important requirement for application to the study of electrochemical processes in living beings. In this work, we describe the fabrication and characterization of BDD electrodes with micrometer dimensions, with a particular emphasis on micro needle electrodes. As a result of the combination of the microelectrode size effect and the intrinsic properties of the diamond films, these electrodes showed not only a significantly lower background current than diamond macroelectrodes, but also an ability for use in analytical sensing in low conductive media. Accordingly, a wider range of experiments including in vivo measurements could be performed.
      原文链接:
    • NSTL
    • Chemical Soc Japan

    Regiodivergent Carbene/Alkyne Metathesis in Chromium-Mediated Coupling and Cyclization with 1,6-Enynes

    Murai, MasahitoTaniguchi, RyujiTakai, Kazuhiko
    5页
    查看更多>>摘要：Regiodivergent carbene/alkyne metathesis for the selective synthesis of 2-alkylidenebicyclo[4.1.0]heptanes and 1-alkenylbicyclo[3.1.0]hexanes from common 1,6-enynes precursors was demonstrated. The cyclization mode could be switched by simple addition of diamine ligands to control the relative orientation of the approaching chromium Schrock carbene equivalents generated in situ from gem-dichromiomethanes toward triple bonds.
      原文链接:
    • NSTL
    • Chemical Soc Japan

    Supported, similar to 1-nm-Sized Platinum Clusters: Controlled Preparation and Enhanced Catalytic Activity

    Kawawaki, TokuhisaShimizu, NobuyukiMitomi, YusukeYazaki, Daichi...
    18页
    查看更多>>摘要：We have been aiming to reduce the amount of platinum (Pt) needed in catalysts for automobile exhaust-gas purification and fuel cell electrodes. To achieve this, we have attempted to: 1) establish simple methods for synthesizing ligand-protected similar to 1-nm-sized Pt clusters with a narrow distribution in the number of constituent atoms; 2) load these clusters onto supports, while retaining their number of constituent atoms, to prepare supported similar to 1-nm-sized Pt clusters; and 3) elucidate the catalytic activity of each type of supported similar to 1-nm-sized Pt cluster. These studies have revealed that: 1) ligand-protected similar to 1-nmsized Pt clusters stable in the atmosphere can be isolated with high purity by a combination of polyol reduction and ligand-exchange reaction; 2) similar to 1-nm-sized Pt clusters can be loaded onto the support without aggregation when the clusters are adsorbed on the support and then calcined at an appropriate temperature; and 3) Pt-17 clusters loaded onto.-alumina exhibit high activity and durability for exhaust-gas purification, whereas Ptn clusters (n = similar to 35, similar to 51, or similar to 66) loaded onto carbon black exhibit high activity and durability for the oxygen reduction reaction (which occurs at fuel cell electrodes). This account describes our previous studies and explores future prospects for supported similar to 1-nm-sized Pt clusters.
      原文链接:
    • NSTL
    • Chemical Soc Japan

    Cooperative Electric Alignment of Colloidal Graphene Oxide Particles with Liquid Crystalline Niobate Nanosheets

    Nakato, TeruyukiSirinakorn, ThipwipaIshitobi, WataruMouri, Emiko...
    9页
    查看更多>>摘要：Binary colloids of two morphologically different particle species cause phase separation containing liquid crystalline phases. Although electric alignment of colloidal nanosheets has been investigated for colloidal systems consisting of single nanosheet species, that of binary nanosheet colloids has scarcely been examined. We report herein the electric alignment of aqueous binary colloids composed of niobate (NB) nanosheets from K4Nb6O17 and commercially available graphene oxide (GO) platelets. The NB-GO binary colloids show multiphase coexistence involving liquid crystalline phases induced by the NB nanosheets, whereas the employed GO particles do not contribute to the liquid crystallinity. The NB nanosheets in the binary colloids are electrically aligned in parallel to an AC voltage (1 kV cm(-1)1 peak to peak, 50 kHz) applied to the sample. When the concentration of GO in the binary colloids is low enough, the GO particles are also electrically aligned although they hardly respond to electric field in the absence of NB nanosheets. Combined optical microscopy of bright-field, polarized, and fluorescence observations demonstrates that isolated GO particles are dragged by the aligning motion of the NB nanosheets forming liquid crystalline domains. The results indicate that collective motions of colloidal nanosheets can induce participation of isolated particles.
      原文链接:
    • NSTL
    • Chemical Soc Japan

    Selective Hydrothermal Synthesis of Water-Soluble CdTe and CdTe/CdS Colloidal Quantum Dots by Controlling the Te/Cd Molar Ratio of the Precursor Solution

    Shimura, KunioLee, TaeGiIto, TatsuyaKim, DaeGwi...
    6页
    查看更多>>摘要：During the synthesis of CdTe quantum dots (QDs) by the hydrothermal method, a CdS shell layer is naturally formed by the thermal decomposition of thiol ligands, and CdTe/CdS core/shell QDs are produced. Herein, we investigate the selective synthesis of CdTe and CdTe/CdS QDs to control the thermal decomposition of thiol ligands by changing the Te/Cd molar ratio of the precursor solutions. From the experimental results of X-ray photoelectron spectroscopy and optical properties of absorption and photoluminescence (PL) spectra and PL decay profiles of the synthesized colloidal QDs, it was found that the formation of the CdS shell can be controlled by varying the Te/Cd ratio of the precursor solution. Thus, the selective synthesis of CdTe and CdTe/CdS QDs with the same PL energy but different PL decay times is possible.
      原文链接:
    • NSTL
    • Chemical Soc Japan

    Manipulation of Precise Molecular Arrangements and Their Photochemical Properties on Inorganic Surfaces via Multiple Electrostatic Interactions

    Ishida, Yohei
    12页
    查看更多>>摘要：Multiple (or multivalent) interaction is the key in many biological systems. One of the most important (photo-)chemical reactions, photosynthesis, is driven by regularly aligned molecules by multiple interactions between proteins and molecules. A grand challenge of modern chemistry therefore includes the construction of supramolecular assemblies and control of their functions for mimicking nature and beyond. While most synthetic systems depend on covalent, coordination and hydrogen bonds between molecules, my approach focuses on multiple electrostatic interactions with two-dimensional clay mineral nanosheets. I here summarize my recent work on manipulation of precise molecular arrangements and photochemical properties via multiple electrostatic interactions. This Account mainly consists of the three parts; 1: manipulation of photochemical properties of molecules and new emission enhancement phenomenon (chapters 2-7), 2: efficient photochemical reactions and artificial photosynthesis model (chapters 8-14), and 3: molecular-scale understanding by means of electron microscopy (chapters 15-17).
      原文链接:
    • NSTL
    • Chemical Soc Japan