A5020541577- Organic and Molecular Conductors Research
- Spectroscopy and Quantum Chemical Studies
- Semiconductor Quantum Structures and Devices
- Perovskite Materials and Applications
- Fluorine in Organic Chemistry
- Cyclopropane Reaction Mechanisms
- Chemical Reactions and Isotopes
- Solid-state spectroscopy and crystallography
- Inorganic and Organometallic Chemistry
- Chalcogenide Semiconductor Thin Films
- Asymmetric Hydrogenation and Catalysis
- Chemical Synthesis and Reactions
- Organic Chemistry Cycloaddition Reactions
- Dielectric materials and actuators
- Quinazolinone synthesis and applications
- Advanced NMR Techniques and Applications
- Electrostatic Discharge in Electronics
- Quantum and electron transport phenomena
- Synthesis and Reactivity of Sulfur-Containing Compounds
- Chemical Synthesis and Analysis
- Synthesis and biological activity
- Antibiotics Pharmacokinetics and Efficacy
- High voltage insulation and dielectric phenomena
- Synthesis and Catalytic Reactions
- Soft Robotics and Applications
The University of Tokyo
2019-2024
Tokyo University of Science
2019-2024
Teikyo University Chiba Medical Center
2023
National Institute of Advanced Industrial Science and Technology
2022
National Institute for Materials Science
2022
Toyohashi University of Technology
2011-2012
An intense terahertz pulse has the potential to control polarization of ferroelectrics at subpicosecond time scale. In some ferroelectrics, it been reported that irradiation with a on order 100 kV/cm modulates in manner proportional electric field. If stronger field is applied, may be possible alter nonlinearly or even cause disappear. However, such attempts have not date. this paper, we aim ferroelectric by irradiating an organic molecular compound tetrathiafulvalene-<a:math...
Abstract Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is a prototypical conducting polymer. When polar solvent used during film fabrication, the hole-doped PEDOT oligomers form crystalline clusters in films, exhibiting high conductivity. However, whether hole carriers exhibit band transport has not been clarified yet. Here, we employ multilayer spin-coating method using an aqueous solution with ethylene glycol, additional procedures of dipping films glycol or dropping...
Untethered control of soft-bodied robots is attractive for interactions in a variety unstructured and dynamic environments. However, soft robotics systems are currently limited terms wireless, selective, scalable multiple actuators. Therefore, we propose method to wirelessly drive actuators by laser projection. A small amount low-boiling-point liquid inside planar thin pouch can be heated evaporated inflate the whole body. Laser projection enables both wireless energy supply selection target...
An excitonic insulator, in which an optical gap is formed by exciton condensation, expected to exhibit large photoresponses. Here, we report the results of femtosecond reflection spectroscopy covering a wide infrared region on typical Ta2NiSe5, gives direct information not only about change but also metallization. With weak excitation, decreases due weakening effect photocarriers. strong Drude-like high-reflection band appears, showing excitonic-insulator-to-metal transition. Analyses...
Abstract Ultrafast electronic-phase change in solids by light, called photoinduced phase transition, is a central issue the field of non-equilibrium quantum physics, which has been developed very recently. In most those phenomena, charge or spin orders an original are melted photocarrier generations, while ordered state usually difficult to be created from non-ordered photoexcitation. Here, we demonstrate that strong terahertz electric-field pulse changes Mott insulator organic molecular...
When a semiconductor is subjected to strong electric field, carriers are generated via quantum tunneling; this termed as dielectric breakdown. Thus, using terahertz pulse drive the breakdown in Mott insulators, which exhibit variations their electronic structures under carrier doping, filling-controlled transition can be induced subpicosecond time scale. However, generate tunneling material with band gap visible or near-infrared regions, an field significantly exceeding $1 \mathrm{MV}...
In this paper, the optical response to a terahertz pulse was investigated in transition metal chalcogenide <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mi mathvariant="normal">T</a:mi><a:msub><a:mi mathvariant="normal">a</a:mi><a:mn>2</a:mn></a:msub><a:mi>NiS</a:mi><a:msub><a:mi mathvariant="normal">e</a:mi><a:mn>5</a:mn></a:msub></a:mrow></a:math>, candidate excitonic insulator. First, by irradiating with relatively weak electric field (0.3 MV/cm), spectral changes...
We have applied a many-body Wannier functions method to theoretically calculate an excitonic optical conductivity spectrum and energy structure in one-dimensional (1D) Mott insulator at absolute zero temperature with large system size. Focusing on full charge fluctuations associated pairs of holon doublon, we employ model, which is interpreted as good effective model investigate photoexcitations 1D extended Hubbard half-filling the spin-charge separation picture. As result, theoretical...
Mott insulators sometimes show dramatic changes in their electronic states after photoirradiation, as indicated by photoinduced Mott-insulator-to-metal transition. In the photoexcited of insulators, electron wavefunctions are more delocalized than ground state, and long-range Coulomb interactions play important roles charge dynamics. However, effects difficult to discriminate experimentally. Here, we that a one-dimensional insulator,...
M. Kawazu, T. Kanno, N. Takamura, Mizoguchi, S. Saito and K. Okumura, J. Chem. Soc. D, 1970, 1047 DOI: 10.1039/C29700001047
Summary A sensitive and reproducible competitive enzyme‐linked immunosorbent assay (ELISA) for the determination of concentration diethylcarbamazine (DEC) in biological fluids was developed. Since DEC has no functional group to conjugate with bovine serum albumin (BSA), N‐(2‐aminoethyl)‐N‐ethyl‐4‐methyl‐1‐piperazinecarboxamide (DEC‐NHJ first synthesized. This compound then converted carboxyl (DEC‐COOH) conjugated BSA poly‐L‐lysine use as immunogen solid‐phase marker, respectively. The ELISA...
In this paper, the simultaneous measurement of space charge and conduction current were performed under constant DC field or increasing a dc ramp to comprehend breakdown phenomena LDPE/MgO nanocmoposite. field, on LDPE increased clearly due positive injection by enhanced local at anode with negative formation in bulk. The nanocomposite MgO content 1 phr also slightly hetero effect anode. case monotonically average increase amount which showed rapid agreed that turned decrease. From these...
A strong terahertz pulse is effective for controlling the macroscopic polarization in ferroelectrics. In present study, we investigated response of an organic molecular compound, namely ${(\mathrm{TMTTF})}_{2}\mathrm{P}{\mathrm{F}}_{6}$ (TMTTF: tetramethyltetrathiafulvalene), to a electric field using pulse-pump optical-reflectivity probe spectroscopy. This compound undergoes transition from Mott insulator charge-order with lowering temperature, and exhibits electronic ferroelectricity...
To clarify the limiting factor of carrier transport in organic molecular semiconductors, we performed charge modulation spectroscopy a field-effect transistor with 3,11-didecyldinaphtho[2,3-d:2′,3′-d′]benzo[1,2-b:4,5-b′]dithiophene (C10-DNBDT-NW) single crystal, which showed hole-carrier mobility 8.4 cm2 V−1 s−1 at 295 K. The terahertz absorption electric-field-induced hole carriers increases decreasing frequency down to 150 cm−1 (4.5 THz). However, it is not reproduced by simple Drude model...
Abstract Etwa 100 Derivate des Eritadenins (I) werden unter Anwendung bekannter, im F ormelschema angedeuteter Methoden hergestellt und mit der Grundsubstanz hinsichtlich ihrer hy ocholesterinämischen Wirkung untersucht.
To understand the space charge formation of low-density polyethylene (LDPE) / nano-sized magnesium oxide (MgO) nanocomposite materials, and conduction current were simultaneously measured up to breakdown under increasing DC ramp field. A negative was dominated in sample without nanofiller (0 phr sample). positive nanocomoposite sample. The field increment (= maximum - average field) 0 increased with then saturated many small rises falls finally before breakdown. In 1 sample, after showing...
With the widespread use of immune checkpoint inhibitors (ICIs) to treat cancer, immune-related adverse events (irAEs) have become a topic research. Gastrointestinal disorders, such as diarrhea and colitis, are frequently occurring irAEs, particularly grade 3-5 irAEs. Here, we report two cases ICI-associated colitis with contrasting outcomes. Colonoscopy findings due ICI erythema, luminal bleeding, erosions, ulcerations, which nonspecific findings. Biopsy is necessary for definitive...
In this study, the optical response to a terahertz pulse was investigated in transition metal chalcogenide Ta$_2$NiSe$_5$, candidate excitonic insulator. First, by irradiating with relatively weak electric field (0.3 MV/cm), spectral changes reflectivity near absorption edge due third-order nonlinearity were measured and peak characteristic of phase just below interband identified. Next, strong 1.65 MV/cm, found be reduced, Drude-like appeared mid-infrared region. These responses can...
A novel method for the synthesis of aryl hydrazones from α-diazo esters has been developed. Since serve as educts in Fischer indole cyclization, many new functionalized indoles can be easily accessed by this methodology.
Abstract Die Reaktion des β‐D‐Ribofranosids (I) mit Adenin (II) in Dimethylformamid führt Gegenwart von Natrium 90%iger Ausbeute zum "umgekehrten" Nucleosid (III).
Abstract Es wird eine modifizierte Merrifield‐Synthese von Peptiden unter Verwendung Halogenacylpolystyrol (I) beschrieben, die schonender als ähnliche Synthesen verläuft.
Abstract Verschiedeneoptische Eigenschaften von α‐Methyl‐a‐aminosäuren (I) werden mit denen aus Proteinen stammenden L‐Aminosäuren (III) verglichen.
Abstract Aus dem Zuckertosylat (I) entstehen mit Na‐Adenin die Kondensate (II), zu (III) verseift werden.