担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1039/D5NH00306G

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

<jats:title>Abstract</jats:title><jats:p>Materials with the same chemical composition can exhibit distinct properties depending on their crystal phases. Here, the synthesis of two types of mesoporous Bi<jats:sub>2</jats:sub>Se<jats:sub>3</jats:sub> films at different reduction potentials is reported and their application in electrochemical glucose sensing. Mesoporous Bi<jats:sub>2</jats:sub>Se<jats:sub>3</jats:sub> is synthesized by incorporating block copolymer micelle assemblies into the deposition solution and applying a reduction potential. To characterize the crystal phases accurately, Bi<jats:sub>2</jats:sub>Se<jats:sub>3</jats:sub> films are heat‐treated at 200 °C for 1 h in a nitrogen atmosphere. The results reveal that the Bi<jats:sub>2</jats:sub>Se<jats:sub>3</jats:sub> films synthesized under different conditions exhibit clearly distinct phases: rhombohedral (<jats:italic>R</jats:italic>‐Bi<jats:sub>2</jats:sub>Se<jats:sub>3</jats:sub>) and orthorhombic (<jats:italic>O</jats:italic>‐Bi<jats:sub>2</jats:sub>Se<jats:sub>3</jats:sub>). The <jats:italic>R</jats:italic>‐Bi<jats:sub>2</jats:sub>Se<jats:sub>3</jats:sub>‐8 nm, featuring 8 nm pores and synthesized at a more negative reduction potential, outperforms its nonporous counterpart, achieving a glucose sensing sensitivity of 0.143 µA cm<jats:sup>−2</jats:sup> µM<jats:sup>−1</jats:sup> and a detection limit of 6.2 µM at pH 7.4 in 0.1 M phosphate‐buffered saline solution. In contrast, the <jats:italic>O</jats:italic>‐Bi<jats:sub>2</jats:sub>Se<jats:sub>3</jats:sub>, prepared at a relatively positive potential, exhibits no glucose‐sensing activity. The inactivity of <jats:italic>O</jats:italic>‐Bi<jats:sub>2</jats:sub>Se<jats:sub>3</jats:sub> for glucose oxidation is likely due to the energetically unfavorable intermediates, as predicted by density functional theory calculations. These findings underscore the critical role of crystal phase control in porous nanomaterials and pave the way for developing innovative porous systems.</jats:p>

DOI： 10.1002/smll.202501534

CiNii Research

PubMed

その他リンク： https://onlinelibrary.wiley.com/doi/pdf/10.1002/smll.202501534

記述言語：英語   掲載種別：研究論文（学術雑誌）

<jats:title>Abstract</jats:title>
<jats:p>Incorporating mesoporous structures into various materials can provide abundant active sites and facilitate smooth diffusion, and their effectiveness has been demonstrated across a range of material types. However, despite the development of numerous mesoporous materials, first-generation mesoporous materials (e.g., silica-based compositions) have limited applications due to their poor electrical conductivity and limited compositional diversity, necessitating additional processing for widespread utilization. Our group first proposed the synthesis of mesoporous metals using a solution-based soft-templating method based on self-assembly of micelles, marking a significant advancement in mesoporous materials. This effective process has recently been extended to the synthesis of mesoporous metals and chalcogenides. Chalcogenides have garnered significant attention due to their intriguing optical, electrical, and electrochemical properties arising from their distinctive electronic structures. Mesoporous chalcogenides have been found to effectively enhance these properties. This paper provides a comprehensive review of the synthesis of mesoporous metals and chalcogenides—representing second-generation mesoporous materials (mesoporous materials 2.0)—with specific examples. Our goal is to inform readers about second-generation mesoporous materials and provide insights for further research.</jats:p>

DOI： 10.1093/bulcsj/uoae136

CiNii Research

その他リンク： https://academic.oup.com/bcsj/article-pdf/98/1/uoae136/61429180/uoae136.pdf

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

<jats:title>Abstract</jats:title>
<jats:p>Mesoporous alumina spherical particles, synthesized via spray-drying with the self-assembly of EOnPOmEOn, have been utilized for the development of clinical-grade molybdenum-99/technetium-99 m (99Mo/99mTc) generators. When evaluated as molybdenum (Mo) adsorbents, the mesoporous alumina spherical particles are useful for effective adsorption of Mo ions rather than commercially available particulate alumina. The effects of surfactant removal methods on the Mo adsorption property are also systematically investigated using the batch method. Batch adsorption studies reveal practical adsorption capacities ranging from 45.9 to 91.2 mg Mo g−1 in a Mo solution (1000 mg Mo L−1) at pH 3. The experimental results indicate the following trend in Mo adsorption capacity: solvent extraction &gt;calcination (400 °C and 800 °C) &gt;commercially available alumina (Medical Al2O3 used as is). To explore the feasibility of developing a clinical-scale generator, a novel tandem column generator concept is employed. Using the spray-dried and extracted mesoporous alumina, 99mTc eluted from the generator exhibits high radionuclidic, radiochemical, and chemical purity, making it suitable for the preparation of 99mTc-labeled radiopharmaceuticals.</jats:p>

DOI： 10.1093/bulcsj/uoae099

CiNii Research

その他リンク： https://academic.oup.com/bcsj/advance-article-pdf/doi/10.1093/bulcsj/uoae099/59594018/uoae099.pdf

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Among various metal-organic frameworks (MOFs), the zeolitic imidazole framework (ZIF), constructed by the regular arrangement of 2-methylimidazole and metal ions, has garnered significant attention due to its distinctive crystals and pore structures. Variations in the sizes and shapes of ZIF crystals have been reported by changing the synthesis parameters, such as the molar ratios of organic ligands to metal ions, choice of solvents, and temperatures. Nonetheless, the giant ZIF-8 single crystals beyond the typical range have rarely been reported. Herein, we present the synthesis of millimeter-scale single crystal ZIF-8 using the solvothermal method in N,N-diethylformamide. The resulting 1-mm single crystal is carefully characterized through N₂ adsorption-desorption isotherms, scanning electron microscopy, and other analytical techniques. Additionally, single-crystal X-ray diffraction is employed to comprehensively investigate the framework’s mobility at various temperatures. Millimeter-sized ZIF-8 single crystals were synthesized using the solvothermal method. These crystals exhibit a notable BET surface area of 1681 m²∙g⁻¹ and demonstrate a reversible change in their crystal structure.

DOI： 10.1080/14686996.2023.2292485

CiNii Research

PubMed

その他リンク： https://www.tandfonline.com/doi/pdf/10.1080/14686996.2023.2292485