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- 저자 : ( Hiroki Yokoi ) (검색결과 2 건)
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( Naoki Takata ),( Hiroki Yokoi ),( Dasom Kim ),( Asuka Suzuki ),( Makoto Kobashi ) 한국부식방식학회 2024 Corrosion Science and Technology Vol.23 No.2
An attempt was made to apply digital image correlation (DIC) strain analysis to in-situ scanning electron microscopy (SEM) observations of bending deformation to quantify local strain distribution inside a ZnMgAl-alloy coating in deformation. Interstitial-free steel sheets were hot-dipped in a Zn-3Mg-6Al (mass%) alloy melt at 400 ℃ for 2 s. The specimens were deformed using a miniature-sized 4-point bending test machine inside the SEM chamber. The observed in situ SEM images were used for DIC strain analysis. The hot-dip ZnMgAl-alloy coating exhibited a solidification microstructure composed of a threephase eutectic of fine Al (fcc), Zn (hcp), and Zn<sub>2</sub>Mg phases surrounding the primary solidified Al phases. The relatively coarsened Zn<sub>2</sub>Mg phases were locally observed inside the ZnMgAl-alloy coating. The DIC strain analysis revealed that the strain was localized in the primary solidified Al phases and fine eutectic microstructure around the Zn<sub>2</sub>Mg phase. The results indicated high deformability of the multi-phase microstructure of the ZnMgAl-alloy coating.
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Azabuckybowl-Based Molecular Tweezers as C<sub>60</sub> and C<sub>70</sub> Receptors
Takeda, Motoki,Hiroto, Satoru,Yokoi, Hiroki,Lee, Sangsu,Kim, Dongho,Shinokubo, Hiroshi American Chemical Society 2018 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.140 No.20
<P>We designed and synthesized molecular tweezers consisting of nitrogen-embedded buckybowl subunits. The judicious choice of the covalent linkers modulated their binding strength with C<SUB>60</SUB> or C<SUB>70</SUB> in solution. Titration studies by optical and <SUP>1</SUP>H NMR analyses revealed a 1:1 composition of the resulting complexes. X-ray diffraction analysis elucidated their solid-state structures, in which two azabuckybowl units surround one fullerene molecule. The large association constants stabilize the complexes toward redox reactions and the purification process on silica-gel column chromatography. The linker enabled tuning of the cavity size for binding of fullerenes, achieving complementary fullerene hosts for C<SUB>60</SUB> and C<SUB>70</SUB>: the carbazole-bridged dimer preferentially associates with C<SUB>70</SUB> over C<SUB>60</SUB>, while the phenanthrene-bridged dimer interacts with C<SUB>60</SUB> more strongly than C<SUB>70</SUB>. Electrochemical analysis in combination with density functional theory calculations indicated the existence of intermolecular charge-transfer interactions between the buckybowl units and the fullerenes. Nonlinear optical measurements showed that the two-photon absorption cross sections of the molecular tweezers are enhanced upon association with fullerenes.</P> [FIG OMISSION]</BR>
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