A5000750902- Electron and X-Ray Spectroscopy Techniques
- Mesoporous Materials and Catalysis
- Zeolite Catalysis and Synthesis
- Catalytic Processes in Materials Science
- X-ray Diffraction in Crystallography
- Advanced Electron Microscopy Techniques and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Crystallization and Solubility Studies
- Ion-surface interactions and analysis
- Catalysis and Oxidation Reactions
- Advancements in Photolithography Techniques
- ZnO doping and properties
- X-ray Spectroscopy and Fluorescence Analysis
- Copper-based nanomaterials and applications
- Advanced Materials Characterization Techniques
- Metal-Organic Frameworks: Synthesis and Applications
- Quantum Dots Synthesis And Properties
- GaN-based semiconductor devices and materials
- Electrocatalysts for Energy Conversion
- Diamond and Carbon-based Materials Research
- Electrochemical Analysis and Applications
- Nanoparticle-Based Drug Delivery
- Iron oxide chemistry and applications
- Cellular Mechanics and Interactions
- Photonic Crystals and Applications
JEOL (Japan)
2015-2024
Tohoku University
2010-2024
Tokyo Electron (Japan)
2024
AVL (France)
2010-2011
JEOL (United Kingdom)
2011
Osaka Prefecture University
2009
Stockholm University
2009
Nanosc (Sweden)
2009
Korea Advanced Institute of Science and Technology
2009
Doshisha University
2008
We report a strategy to expand the pore aperture of metal-organic frameworks (MOFs) into previously unattained size regime (>32 angstroms). Specifically, systematic expansion well-known MOF structure, MOF-74, from its original link one phenylene ring (I) two, three, four, five, six, seven, nine, and eleven (II XI, respectively), afforded an isoreticular series MOF-74 structures (termed IRMOF-74-I XI) with apertures ranging 14 98 angstroms. All members this have noninterpenetrating exhibit...
Hierarchical zeolites are a class of microporous catalysts and adsorbents that also contain mesopores, which allow for fast transport bulky molecules thereby enable improved performance in petrochemical biomass processing. We used repetitive branching during one-step hydrothermal crystal growth to synthesize new hierarchical zeolite made orthogonally connected nanosheets. The nanosheets 2 nanometers thick network 0.5-nanometer micropores. house-of-cards arrangement the creates permanent 2-...
Pd/CeO2 is an active component in emission control catalysts for CO oxidation. Nanostructured CeO2 powders can be prepared the form of rods exposing predominantly (111) surfaces and cubes (100) surfaces. While differences reactivity Pd supported on these facets ceria have been reported, origins are not well understood. exhibits room-temperature oxidation activity, while surface shows comparable activity at a temperature that 60 °C higher. Earlier, we established Pd/CeO2-rods due to...
The optical chirality induced at the absorption bands due to electronic exciton coupling of transition dipole moments between chromophores in close proximity is ubiquitous helical organic materials. However, inorganic materials with activity resulting from transitions have not been explored. Here we report synthesis chiral TiO(2) fibres via transcription structure amino acid-derived amphiphile through coordination bonding interactions organics and source. Upon calcination, as-prepared...
We enclose octahedral silver nanocrystals (Ag NCs) in metal-organic frameworks (MOFs) to make mesoscopic constructs O(h)-nano-Ag⊂MOF which the interface between Ag and MOF is pristine ordered (crystalline) oriented on NCs. This achieved by atomic layer deposition of aluminum oxide NCs addition a tetra-topic porphyrin-based linker, 4,4',4″,4‴-(porphyrin-5,10,15,20-tetrayl)tetrabenzoic acid (H4TCPP), react with alumina [Al2(OH)2TCPP] enclosures around Alumina thickness precisely controlled...
Helical symmetry can be found in most flowers with a rotation of contort petal aestivation. For micro- and nanoscale analogies, flower mimicking structures have been reproduced; however, the conceptual chirality "nanoflowers" has not yet defined. Here, "flower" was defined by its nanosized chiral structure consequent optical activity (OA), opening new horizons for physical theory materials. We report surfactant-mediated hydrothermal synthesis CuO nanoflowers using sodium dodecyl sulfate...
Silicoaluminophosphate zeolite SAPO-34 with CHA topology is known as one of the best catalysts for methanol-to-olefin (MTO) conversion. In this work, we demonstrate a facile one-step hydrothermal synthesis hierarchically macroporous through etching effect hydrofluoric acid. The highly crystalline prepared central-holed rhombohedral crystals particle size ca. 5–10 μm that comprise intracrystalline parallel macrochannels 100 nm. formation structures via in situ growth-etching can be directly...
A novel porous ZnO@Co<sub>3</sub>O<sub>4</sub> composite is obtained from ZIF-8@ZIF-67 crystals and exhibits a distinguished photocatalytic activity stability for CO<sub>2</sub> reduction.
Abstract Inorganic nanomaterials endowed with hierarchical chirality could open new horizons in physical theory and applications because of their fascinating properties. Here, we report chiral ZnO films coated on quartz substrates a nanostructure ranging from atomic to micrometer scale. Three levels exist the films: helical crystalline structures that form primary helically coiled nanoplates, secondary stacking these tertiary nanoscale circinate aggregates formed by several stacked...
Abstract A combination of atomic force microscopy (AFM), high‐resolution scanning electron (HR‐SEM), focused‐ion‐beam (FIB‐SEM), X‐ray photoelectron spectroscopy (XPS), confocal fluorescence (CFM), and UV/Vis synchrotron‐based IR microspectroscopy was used to investigate the dealumination processes zeolite ZSM‐5 at individual crystal level. It shown that steaming has a significant impact on porosity, acidity, reactivity materials. The catalytic performance, tested by styrene oligomerization...
Magnetic nanoparticles (MNPs) have many potential biomedical applications. Improvements in their magnetic properties and solubility are necessary for these applications to realize full potential. In this study, MNPs the form of raspberry-like magnetite (Fe3O4) nanoparticle clusters, consisting tiny Fe3O4 particles with a diameter approximately 20 nm, were prepared under hydrothermal conditions at 200 °C presence 3,4-dihydroxyhydroxysinnamic acid (DHCA). The primary connected by DHCA...
The present study reports the unbiased chemical etching of micron-sized ZSM-5 crystals with an NH4F solution, resulting in house-of-cards-like single containing large rectangular cavities surrounded by thin (15–30 nm), flat, and highly crystalline walls. formation such architecture is a result preferential extraction misoriented nanocrystalline domains followed uniform dissolution remaining part crystal. characteristic features NH4F-treated zeolites are retention framework composition...
Abstract About 15 years ago, the Ryoo group described synthesis of CMK‐5, a material consisting hexagonal arrangement carbon nanotubes. Extension surface casting to oxide compositions, however, was not possible so far, in spite many attempts. Here it is demonstrated, that crystalline mesoporous hollow zirconia materials with very high areas up 400 m 2 g −1 , and selected cases form CMK‐5‐like, are indeed accessible via such process. The key for successful an increased interaction between...
Abstract To ensure compositional consistency while mitigating potential immunogenicity for stem cell therapy, synthetic scaffolds have emerged as compelling alternatives to native extracellular matrix (ECM). Substantial progress has been made in emulating specific natural traits featuring consistent chemical compositions and physical structures. However, recapitulating the dynamic responsiveness of ECM involving transitions remodeling during differentiation, remains a challenging endeavor....
The Yes-associated protein (YAP) is a major oncoprotein responsible for cell proliferation control. YAP's oncogenic activity regulated by both the Hippo kinase cascade and uniquely mechanical-force-induced actin remodeling process. Inspired reports that ovarian cancer cells specifically accumulate phosphatase ALPP on lipid rafts physically link to cytoskeleton, we developed molecular self-assembly (MSA) technology selectively halts inactivating YAP. We designed ruthenium-complex-peptide...
The inner heterogeneity of ZSM-5 zeolite and the building mechanism architecture in synthesis was revealed through NH<sub>4</sub>F-etching. described by concepts defect-zoning Al-zoning.
Abstract Advances in mechanistic understanding of integrin-mediated adhesion highlight the importance precise control ligand presentation directing cell migration. Top-down nanopatterning limited spatial to sub-micron placing restrictions on both fundamental study and biomedical applications. To break constraint, here we propose a bottom-up nanofabrication strategy enhance resolution molecular level using simple formulation that is applicable as treatment agent. Via self-assembly...
A newly developed wavelength-dispersive soft X-ray emission spectrometer (WD-SXES) with two kinds of gratings, JS50XL and JS200N, were installed on electron probe microanalysers (EPMA) scanning microscopes (SEM). The new detector covers the energy range from 50 to 210 eV an resolution better than 0.2 at Al-L Al metal. With this low high resolution, various lines K, L, M, N spectra lithium uranium could be observed chemical state analysis carried out. This WD-SXES has also a potential for...