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n-Doping of Single-walled Carbon Nanotubes Using Pyridine-boryl Radicals
Naoki Tanaka,Aoi Hamasuna,Tsuyohiko Fujigaya 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
The chemical doping of single-walled carbon nanotubes (SWCNTs) using electron donor and acceptor molecules is a crucial step for controlling the frontier orbital energy gap of SWCNTs. This means that SWCNTs are a promising material for electronics applications such as thermoelectric conversion and thin-film transistors, due to their flexibility, stability and light weight. Among all chemical dopants, 2 organic dopants containing hetero atoms are important materials as they permit fine controllability of the doping level; they also provide stability due to the flexibility of their structural design. In this study, we found that pyridine-boryl (py-boryl) radicals serve as efficient electron-doping reagents for SWCNTs, in which the doping mechanism comprises electron transfer from the py-boryl radical to the SWCNT. The formation of a stable py-boryl cation is essential for efficient doping; the captodative effect of the py-boryl cation is important to this process.
Tanaka, Yasuo,Saito, Shohei,Mori, Shigeki,Aratani, Naoki,Shinokubo, Hiroshi,Shibata, Naoki,Higuchi, Yoshiki,Yoon, Zin Seok,Kim, Kil Suk,Noh, Su Bum,Park, Jong Kang,Kim, Dongho,Osuka, Atsuhiro WILEY-VCH Verlag 2008 Angewandte Chemie Vol.47 No.4
<B>Graphic Abstract</B> <P>Round the twist: Metalation of [36]octaphyrin 1 provided the Möbius aromatic Pd<SUB>2</SUB> complex 3 as well as the Hückel antiaromatic Pd<SUB>2</SUB> complex 2. This method can be applied to other expanded porphyrins and Group 10 metal ions. The aromatic/antiaromatic character was supported by NMR spectrscopy, NICS calculation, and two-photon absorption measurements. <img src='wiley_img/14337851-2008-47-4-ANIE200704407-content.gif' alt='wiley_img/14337851-2008-47-4-ANIE200704407-content'> </P>
Tanaka Naoki,Yano Hiroaki,Ebata Yasuhiko,Ebihara Kazuaki 대한재활의학회 2023 Annals of Rehabilitation Medicine Vol.47 No.3
Objective To measure muscle activity before and after robot-assisted gait training (RAGT) in patients with stroke and examine the differences in muscle activity changes compared with conventional gait training (CGT).Methods Thirty patients with stroke (RAGT group, n=17; CGT group, n=13) participated in the study. All patients underwent RAGT using a footpad locomotion interface or CGT for 20 minutes for a total of 20 sessions. Outcome measures were lower-limb muscle activity and gait speed. Measurements were performed before the start of the intervention and after the end of the 4-week intervention.Results The RAGT group showed increased muscle activity in the gastrocnemius, whereas the CGT group showed high muscle activity in the rectus femoris. In the terminal stance of the gait cycle, the gastrocnemius, the increase in muscle activity was significantly higher in the RAGT group than in the CGT group.Conclusion The results suggest that RAGT with end-effector type is more effective than CGT to increase the gastrocnemius muscle activity.
Porphyrin–hexaphyrin hybrid tapes
Tanaka, Takayuki,Aratani, Naoki,Lim, Jong Min,Kim, Kil Suk,Kim, Dongho,Osuka, Atsuhiro Royal Society of Chemistry 2011 Chemical science Vol.2 No.7
<P>A <I>meso-meso</I> linked porphyrin–hexaphyrin hybrid was synthesized by the cross condensation using <I>meso</I>-porphyrinyl-dipyrromethane and was oxidized with DDQ-Sc(OTf)<SUB>3</SUB> to afford a porphyrin–[26]hexaphyrin hybrid tape that was reduced with NaBH<SUB>4</SUB> to give a porphyrin–[28]hexaphyrin hybrid tape. Fully electronic conjugations in the hybrid tapes are observed in the UV/vis/NIR absorption spectra, electrochemistry, and excited-state dynamics.</P> <P>Graphic Abstract</P><P>A <I>meso-meso</I> linked porphyrin–hexaphyrin hybrid was synthesized by the cross condensation reaction and was oxidized with DDQ-Sc(OTf)<SUB>3</SUB> to afford a porphyrin–[26]hexaphyrin hybrid tape that can be reduced to [28]hexaphyrin congener. Fully electronic conjugations in the hybrid tapes are observed in the UV/vis/NIR absorption spectra, electrochemistry, and excited-state dynamics. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1sc00228g'> </P>
Clinical Usefulness of Dual Red Imaging in Gastric Endoscopic Submucosal Dissection: A Pilot Study
Naoki Yorita,Shiro Oka,Shinji Tanaka,Takahiro Kotachi,Naoko Nagasaki,Kosaku Hata,Kazutaka Kuroki,Kazuhiko Masuda,Mio Kurihara,Mariko Kiso,Tomoyuki Boda,Masanori Ito,Kazuaki Chayama 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.1
Background/Aims: Dual red imaging (DRI) is a new, image-enhanced endoscopy technique. There are few reports about the usefulnessof DRI during gastric endoscopic submucosal dissection (ESD). We aimed to examine the usefulness of DRI in endoscopic hemostasisduring gastric ESD. Methods: We enrolled a total of 20 consecutive patients who underwent gastric ESD. Five endoscopists compared DRI with white lightimaging (WLI) for the visibility of blood vessels and bleeding points while performing endoscopic hemostasis. Results: The visibility of blood vessels was increased in 56% (19/34) of the cases, and the visibility of bleeding points was improved in55% (11/20) of the cases with the use of DRI compared with the use of WLI. Conclusions: DRI improved the visibility of blood vessels and bleeding points in cases with oozing bleeding, blood pooling around thebleeding points, and multiple bleeding points.
Structures and Magnetic Properties of Tm1−yYyMn1−xCoxO3
Toshiyuki Tanaka,Akira Kumagai,Yusuke Amakai,Naoki Momono,Shigeyuki Murayama,Hideaki Takano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The structure and magnetic properties of Tm1−yYyMn1−xCoxO3 with 0 5 x 5 0.5 and0 5 y 5 0.3 were investigated by X-ray diffraction, specific heat and magnetization measurements. Thulium manganite TmMnO3 prepared by solid-state synthesis at ambient pressure ishexagonal and antiferromagnetic with a N`eel temperature TN of 86 K. The substitution of Y for Tmin TmMnO3 does not greatly affect the fundamental hexagonal structure. The magnetization andspecific heat measurement results for Tm1−yYyMnO3 can be qualitatively explained in terms of thedilution effect of Tm by Y. On the other hand, the structure of TmMn1−xCoxO3 changes graduallyfrom hexagonal to orthorhombic with the substitution of Co for Mn; hexagonal and orthorhombicphases coexist in samples for x 5 0.3 whereas TmMn0.6Co0.4O3 is almost a single orthorhombicphase. The magnetization of TmMn0.6Co0.4O3 in a field of 250 Oe increases rapidly at about60K with decreasing temperature. The difference between zero-field-cooled (ZFC) and field-cooled(FC) magnetizations increases remarkably at about 60 K. Moreover, the temperature dependencesof the ZFC and the FC magnetizations exhibit peaks at about 40 and 30 K, respectively. Thus,TmMn1−xCoxO3 exhibits complex magnetic properties.
Application of Pseud-superplastic PM Process to Ti-Al Intermetallic Compound for MEMS Parts
Miyano Naoki,Kumagai Yusuke,Yoshimoto Masayoshi,Nishimura Yuta,Tanaka Shigeo,Ameyama Kei 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
A non-equilibrium powder metallurgy processing such as an MA/SPS (Mechanical Alloying / Spark Plasma Sintering) process is examined in a Ti-48moll%Al. TiAl intermetallic compound is a potential light-weight/high-temperature structural material. One of the major problems, however, limiting the practical use of the material is its poor workability. From this point, the powder metallurgy (PM) processing route has been attractive alternative of the conventional processing for such material The MA/SPS process is able to apply to a LIGA process. Optimization of the pseudo-superplasticity enables to fabricate micro-parts made of fine grained ceramics composites of TiAl by the LIGA process.