Taketoshi Minato | National Institutes of Natural Sciences (original) (raw)

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Papers by Taketoshi Minato

Journal of Physical Chemistry C, Apr 17, 2019

Journal of materials chemistry. A, Materials for energy and sustainability, 2019

The Journal of Chemical Physics, 2024

This study investigates the interface between ice and organic solvents using atomic force microsc... more This study investigates the interface between ice and organic solvents using atomic force microscopy (AFM). Atomically flat ice surfaces were prepared and observed by AFM in 1-octanol, 1-hexanol, and 1-butanol. The results show differences in surface roughness influenced by the interaction of ice and alcohols. Young’s modulus of ice was analyzed by force curve measurements, providing valuable insights into the properties of ice in liquid environments. The results showed the characteristics of the ice surface in different solvents, suggesting potential applications in understanding surface and interface phenomena associated with ice under realistic conditions.

Scientific Reports, 2024

Recent advancements in computational science and interfacial measurements have sparked interest i... more Recent advancements in computational science and interfacial measurements have sparked interest in microscopic water droplets and their diverse behaviors. A previous study using nonlinear spectroscopy revealed the heterogeneous wetting phenomenon of silica glass in response to humidity. Building on this premise, we employed high-resolution atomic force microscopy to investigate the wetting dynamics of silica glass surfaces at various humidity levels. Our observations revealed the spontaneous formation of nano-water droplets at a relative humidity of 50%. In contrast to the conventional model, which predicts the spreading of nanodroplets to form a uniform water film, our findings demonstrate the coexistence of nano-water droplets and the liquid film. Moreover, the mobility of the nano-water droplets suggests their potential in inducing the transport of adsorbates on solid surfaces. These results may contribute to the catalytic function of solid materials.

The Chemical Society of Japan, Jan 18, 2021

ECS Meeting Abstracts, 2008

Nature Communications

Enantioselectivity of helical aggregation is conventionally directed either by its homochiral ing... more Enantioselectivity of helical aggregation is conventionally directed either by its homochiral ingredients or by introduction of chiral catalysis. The fundamental question, then, is whether helical aggregation that consists only of achiral components can obtain enantioselectivity in the absence of chiral catalysis. Here, by exploiting enantiospecific interaction due to chiral-induced spin selectivity (CISS) that has been known to work to enantio-separate a racemic mixture of chiral molecules, we demonstrate the enantioselectivity in the assembly of mesoscale helical supramolecules consisting of achiral cobalt phthalocyanines. The helical nature in our supramolecules is revealed to be mesoscopically incorporated by dislocation-induced discretized twists, unlike the case of chiral molecules whose chirality are determined microscopically by chemical bond. The relevance of CISS effect in the discretized helical supramolecules is further confirmed by the appearance of spin-polarized curre...

Chemistry of Materials, 2020

With the increasing development of electric vehicles and portable devices, there is a strong requ... more With the increasing development of electric vehicles and portable devices, there is a strong requirement for high-energy batteries. To improve battery energy, multielectron transfer electrode react...

The Journal of Physical Chemistry C, 2018

ECS Meeting Abstracts, 2013

Applied Physics Express, 2024

The functionalities of materials are governed by the atom type and arrangement, and perturbations... more The functionalities of materials are governed by the atom type and arrangement, and perturbations caused by defects and adsorbate interactions often significantly alter the behavior of materials. Scanning probe microscopy (SPM) can capture complex interactions caused by the structures on surfaces. It is, however, difficult to analyze such interactions appearing there. In this paper, an image-processing technique that employs template matching to recognize local structures in SPM images and calculate positional correlations is reported. This approach opens new avenues for investigating intricate perturbations in the sciences and provides detailed insights into materials science.

Nature Communication, 2023

Enantioselectivity of helical aggregation is conventionally directed either by its homochiral ing... more Enantioselectivity of helical aggregation is conventionally directed either by its homochiral ingredients or by introduction of chiral catalysis. The fundamental question, then, is whether helical aggregation that consists only of achiral components can obtain enantioselectivity in the absence of chiral catalysis. Here, by exploiting enantiospecific interaction due to chiral-induced spin selectivity (CISS) that has been known to work to enantio-separate a racemic mixture of chiral molecules, we demonstrate the enantioselectivity in the assembly of mesoscale helical supramolecules consisting of achiral cobalt phthalocyanines. The helical nature in our supramolecules is revealed to be mesoscopically incorporated by dislocation-induced discretized twists, unlike the caseof chiralmoleculeswhose chirality aredeterminedmicroscopically by chemical bond. The relevance of CISS effect in the discretized helical upramolecules is further confirmed by the appearance of spin-polarized current through the system. These observations mean that the application of CISS based enantioselectivity is no longer limited to systems with microscopic chirality but is expanded to the one with mesoscopic chirality.

Small, 2023

Chiral molecules have recently received renewed interest as highly efficient sources of spin-sele... more Chiral molecules have recently received renewed interest as highly efficient sources of spin-selective charge emission known as chiral-induced spin selectivity (CISS), which potentially offers a fascinating utilization of organic chiral materials in novel solid-state spintronic devices. However, a practical use of CISS remains far from completion, and rather fundamental obstacles such as (i) external controllability of spin, (ii) function durability, and (iii) improvement of spin-polarization efficiency have not been surmounted to date. In this study, these issues are addressed by developing a self-assembled monolayer (SAM) of overcrowded alkene (OCA)-based molecular motor. With this system, it is successfully demonstrated that the direction of spin polarization can be externally and repeatedly manipulated in an extremely stable manner by switching the molecular chirality, which is achieved by a formation of the covalent bonds between the molecules and electrode. In addition, it is found that a higher stereo-ordering architecture of the SAM of OCAs tailored by mixing them with simple alkanethiols considerably enhances the efficiency of spin polarization per a single OCA molecule. All these findings provide the creditable feasibility study for strongly boosting development of CISS-based spintronic devices that can simultaneously fulfill the controllability, durability, and high spin-polarization efficiency.

Advanced Energy and Sustainability Research

Fluoride shuttle batteries (FSBs) are superior to lithium-ion batteries (LIBs) in terms of high e... more Fluoride shuttle batteries (FSBs) are superior to lithium-ion batteries (LIBs) in terms of high energy density, safety, etc. An electrolyte consisting of tetraglyme (G4) as a solvent molecule and triphenylboroxine (TPhBX) as an anion acceptor to improve the solubility of cesium fluoride (CsF) salt is a candidate of the electrolytes for FSBs. The low concentration of CsF in the electrolyte makes it difficult to study. Electrical X-Ray total scattering and anomalous X-Ray scattering (AXS) are powerful techniques for studying the local structures of electrolytes. This study shows that AXS measurement with a Cs K-edge can clarify the local structure around very low atomic concentration (0.27 at%) Cs. The first-neighbor distance and the coordination number suggest that Csþ ions exist in the major Cs(G4)2 þ complex together with the minor Cs(G4)þ. The low-Q peak observed in the scattering patterns can be attributed to the structure of alternating [TPhBX]F and [Cs(G4)]þ (or [Cs(G4)2]þ). The large sizes of cations ([Cs(G4)]þ and [Cs(G4)2] þ) and anion [TPhBX]F lead to a long correlation distance. This work presents the picture that the F ions hop from TPhBX to [Cs(G4)]þ or [Cs(G4)2]þ toward the cathode and anode during charge and discharge, respectively.

Journal of Physical Chemistry C, Apr 17, 2019

Journal of materials chemistry. A, Materials for energy and sustainability, 2019

The Journal of Chemical Physics, 2024

This study investigates the interface between ice and organic solvents using atomic force microsc... more This study investigates the interface between ice and organic solvents using atomic force microscopy (AFM). Atomically flat ice surfaces were prepared and observed by AFM in 1-octanol, 1-hexanol, and 1-butanol. The results show differences in surface roughness influenced by the interaction of ice and alcohols. Young’s modulus of ice was analyzed by force curve measurements, providing valuable insights into the properties of ice in liquid environments. The results showed the characteristics of the ice surface in different solvents, suggesting potential applications in understanding surface and interface phenomena associated with ice under realistic conditions.

Scientific Reports, 2024

Recent advancements in computational science and interfacial measurements have sparked interest i... more Recent advancements in computational science and interfacial measurements have sparked interest in microscopic water droplets and their diverse behaviors. A previous study using nonlinear spectroscopy revealed the heterogeneous wetting phenomenon of silica glass in response to humidity. Building on this premise, we employed high-resolution atomic force microscopy to investigate the wetting dynamics of silica glass surfaces at various humidity levels. Our observations revealed the spontaneous formation of nano-water droplets at a relative humidity of 50%. In contrast to the conventional model, which predicts the spreading of nanodroplets to form a uniform water film, our findings demonstrate the coexistence of nano-water droplets and the liquid film. Moreover, the mobility of the nano-water droplets suggests their potential in inducing the transport of adsorbates on solid surfaces. These results may contribute to the catalytic function of solid materials.

The Chemical Society of Japan, Jan 18, 2021

ECS Meeting Abstracts, 2008

Nature Communications

Enantioselectivity of helical aggregation is conventionally directed either by its homochiral ing... more Enantioselectivity of helical aggregation is conventionally directed either by its homochiral ingredients or by introduction of chiral catalysis. The fundamental question, then, is whether helical aggregation that consists only of achiral components can obtain enantioselectivity in the absence of chiral catalysis. Here, by exploiting enantiospecific interaction due to chiral-induced spin selectivity (CISS) that has been known to work to enantio-separate a racemic mixture of chiral molecules, we demonstrate the enantioselectivity in the assembly of mesoscale helical supramolecules consisting of achiral cobalt phthalocyanines. The helical nature in our supramolecules is revealed to be mesoscopically incorporated by dislocation-induced discretized twists, unlike the case of chiral molecules whose chirality are determined microscopically by chemical bond. The relevance of CISS effect in the discretized helical supramolecules is further confirmed by the appearance of spin-polarized curre...

Chemistry of Materials, 2020

With the increasing development of electric vehicles and portable devices, there is a strong requ... more With the increasing development of electric vehicles and portable devices, there is a strong requirement for high-energy batteries. To improve battery energy, multielectron transfer electrode react...

The Journal of Physical Chemistry C, 2018

ECS Meeting Abstracts, 2013

Applied Physics Express, 2024

The functionalities of materials are governed by the atom type and arrangement, and perturbations... more The functionalities of materials are governed by the atom type and arrangement, and perturbations caused by defects and adsorbate interactions often significantly alter the behavior of materials. Scanning probe microscopy (SPM) can capture complex interactions caused by the structures on surfaces. It is, however, difficult to analyze such interactions appearing there. In this paper, an image-processing technique that employs template matching to recognize local structures in SPM images and calculate positional correlations is reported. This approach opens new avenues for investigating intricate perturbations in the sciences and provides detailed insights into materials science.

Nature Communication, 2023

Enantioselectivity of helical aggregation is conventionally directed either by its homochiral ing... more Enantioselectivity of helical aggregation is conventionally directed either by its homochiral ingredients or by introduction of chiral catalysis. The fundamental question, then, is whether helical aggregation that consists only of achiral components can obtain enantioselectivity in the absence of chiral catalysis. Here, by exploiting enantiospecific interaction due to chiral-induced spin selectivity (CISS) that has been known to work to enantio-separate a racemic mixture of chiral molecules, we demonstrate the enantioselectivity in the assembly of mesoscale helical supramolecules consisting of achiral cobalt phthalocyanines. The helical nature in our supramolecules is revealed to be mesoscopically incorporated by dislocation-induced discretized twists, unlike the caseof chiralmoleculeswhose chirality aredeterminedmicroscopically by chemical bond. The relevance of CISS effect in the discretized helical upramolecules is further confirmed by the appearance of spin-polarized current through the system. These observations mean that the application of CISS based enantioselectivity is no longer limited to systems with microscopic chirality but is expanded to the one with mesoscopic chirality.

Small, 2023

Chiral molecules have recently received renewed interest as highly efficient sources of spin-sele... more Chiral molecules have recently received renewed interest as highly efficient sources of spin-selective charge emission known as chiral-induced spin selectivity (CISS), which potentially offers a fascinating utilization of organic chiral materials in novel solid-state spintronic devices. However, a practical use of CISS remains far from completion, and rather fundamental obstacles such as (i) external controllability of spin, (ii) function durability, and (iii) improvement of spin-polarization efficiency have not been surmounted to date. In this study, these issues are addressed by developing a self-assembled monolayer (SAM) of overcrowded alkene (OCA)-based molecular motor. With this system, it is successfully demonstrated that the direction of spin polarization can be externally and repeatedly manipulated in an extremely stable manner by switching the molecular chirality, which is achieved by a formation of the covalent bonds between the molecules and electrode. In addition, it is found that a higher stereo-ordering architecture of the SAM of OCAs tailored by mixing them with simple alkanethiols considerably enhances the efficiency of spin polarization per a single OCA molecule. All these findings provide the creditable feasibility study for strongly boosting development of CISS-based spintronic devices that can simultaneously fulfill the controllability, durability, and high spin-polarization efficiency.

Advanced Energy and Sustainability Research

Fluoride shuttle batteries (FSBs) are superior to lithium-ion batteries (LIBs) in terms of high e... more Fluoride shuttle batteries (FSBs) are superior to lithium-ion batteries (LIBs) in terms of high energy density, safety, etc. An electrolyte consisting of tetraglyme (G4) as a solvent molecule and triphenylboroxine (TPhBX) as an anion acceptor to improve the solubility of cesium fluoride (CsF) salt is a candidate of the electrolytes for FSBs. The low concentration of CsF in the electrolyte makes it difficult to study. Electrical X-Ray total scattering and anomalous X-Ray scattering (AXS) are powerful techniques for studying the local structures of electrolytes. This study shows that AXS measurement with a Cs K-edge can clarify the local structure around very low atomic concentration (0.27 at%) Cs. The first-neighbor distance and the coordination number suggest that Csþ ions exist in the major Cs(G4)2 þ complex together with the minor Cs(G4)þ. The low-Q peak observed in the scattering patterns can be attributed to the structure of alternating [TPhBX]F and [Cs(G4)]þ (or [Cs(G4)2]þ). The large sizes of cations ([Cs(G4)]þ and [Cs(G4)2] þ) and anion [TPhBX]F lead to a long correlation distance. This work presents the picture that the F ions hop from TPhBX to [Cs(G4)]þ or [Cs(G4)2]þ toward the cathode and anode during charge and discharge, respectively.

ACADEMIC GROOVE Vol.1 SIGNAL−Humanities and Social Sciences, 2019

国家／プラトン著／ 本書で行われている議論の中には、現代の倫理観では受け入れ難い部分も多い。学生の頃にこの本を読んだ私は、その後の哲学に多大な影響を与えたとされるこの本が書かれた時代で、何故この... more 国家／プラトン著／ 本書で行われている議論の中には、現代の倫理観では受け入れ難い部分も多い。学生の頃にこの本を読んだ私は、その後の哲学に多大な影響を与えたとされるこの本が書かれた時代で、何故このような倫理観が受け入れられたか考えた。そして、その後人類は歴史を経て、当時とは異なる倫理観にどのようにして達したのだろうかと考えた。さらに、この本の中で行われている正義に関する議論の姿勢から、私自身が目指していた研究者にとって、どのように行動していくことが正義となるのかを考え、研究者としての自分の行為の価値基準をどこに置くかということを考える上で大きな参考になった。科学の評価の仕方も時代を経て変化するが、持続的に人々にいいsignalを与える成果を得るためにどうすればいいかを、今でも常に考えている。