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INTERACTION OF SINGLE-WALLED CARBON NANOTUBES WITH AMINE
YUTAKA MAEDA,MICHIO YAMADA,TADASHI HASEGAWA,TAKESHI AKASAKA,JING LU,SHIGERU NAGASE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.1
Single-walled carbon nanotubes (SWNTs) have excellent mechanical and electrical properties that have led to the proposal of many potential applications. However, SWNTs are typically grown as bundles of metallic and semiconducting tubes. This prevents their widespread application. Therefore, it is technologically critical to disperse and purify SWNTs and separate metallic and semiconducting SWNTs effectively. Recent progress and advances have been made on dispersion, separation, assemble, and control of electronic property of SWNTs by the interaction of organic molecules. This paper presents a brief review of the interaction of SWNTs with amine.
C60(OH)n-ASSISTED DISPERSION OF SINGLE-WALLED CARBON NANOTUBES
YUTAKA MAEDA,TAKAAKI KATO,JUNKI HIGO,TADASHI HASEGAWA,TAKAHIRO KITANO,TAKAHIRO TSUCHIYA,TAKESHI AKASAKA,TOSHIYA OKAZAKI,JING LU,SHIGERU NAGASE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2008 NANO Vol.3 No.6
We demonstrate that C60(OH)n-assists the dispersion of SWNTs in aqueous and nonaqueous solutions, which effectively exfoliates large-diameter SWNTs. The SWNT dispersions are characterized by absorption and photoluminescence spectra.
TADASHI HASEGAWA,TAKESHI AKASAKA,YUTAKA MAEDA,MASAHIRO HASHIMOTO,MAKOTO KANDA,TAKAHIRO TSUCHIYA,TAKATSUGU WAKAHARA,YUHEI MIYAUCHI,SHIGEO MARUYAMA,JING LU,SHIGERU NAGASE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2007 NANO Vol.2 No.4
Single-walled carbon nanotubes (SWNTs) synthesized by catalytic decomposition of an alcohol were purified by extraction. The purified SWNTs were characterized on the basis of visible-near infrared (vis-NIR) absorption, photoluminescence and Raman spectroscopic analyses, scanning electron microscopy (SEM) observation, and thermal analysis. Selective extraction of metallic nanotubes was also achieved by the extraction condition.
Sho Hasegawa,Shinsuke Koshita,Yoshihide Kanno,Takahisa Ogawa,Toshitaka Sakai,Hiroaki Kusunose,Kensuke Kubota,Atsushi Nakajima,Yutaka Noda,Kei Ito 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.6
Background/Aims: The use of endoscopic intervention (EI) for acute biliary pancreatitis (ABP) remains controversial because theseverity of biliary obstruction/cholangitis/pancreatitis is not reflected in the indications for early EI (EEI). Methods: A total of 148 patients with ABP were included to investigate 1) the differences in the rate of worsening cholangitis/pancreatitis between the EEI group and the early conservative management (ECM) group, especially for each severity of cholangitis/pancreatitis, and 2) the diagnostic ability of imaging studies, including endoscopic ultrasound (EUS), to detect common bile ductstones (CBDSs) in the ECM group. Results: No differences were observed in the rate of worsening cholangitis between the EEI and ECM groups, regardless of theseverity of cholangitis and/or the existence of impacted CBDSs. Among patients without impacted CBDSs and moderate/severecholangitis, worsening pancreatitis was significantly more frequent in the EEI group (18% vs. 4%, p=0.048). In patients in the ECMgroup, the sensitivity and specificity for detecting CBDSs were 73% and 98%, respectively, for EUS, whereas the values were 13% and92%, respectively, for magnetic resonance cholangiopancreatography. Conclusions: EEI should be avoided in the absence of moderate/severe cholangitis and/or impacted CBDSs because of the high rateof worsening pancreatitis. EUS can contribute to the accurate detection of residual CBDSs, for the determination of the need forelective EI.
Maeda, Yutaka,Higo, Junki,Amagai, Yuri,Matsui, Jun,Ohkubo, Kei,Yoshigoe, Yusuke,Hashimoto, Masahiro,Eguchi, Kazuhiro,Yamada, Michio,Hasegawa, Tadashi,Sato, Yoshinori,Zhou, Jing,Lu, Jing,Miyashita, Tok American Chemical Society 2013 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.135 No.16
<P>This report describes a helicity-selective photoreaction of single-walled carbon nanotubes (SWNTs) with disulfide in the presence of oxygen. The SWNTs were characterized using absorption, photoluminescence (PL), Raman, and X-ray photoelectron spectroscopy, scanning electron microscopy, and current–voltage (<I>I</I>–<I>V</I>) measurements. Results showed remarkable helicity-selective (metallic SWNTs/semiconducting SWNTs and diameter) functionalization of SWNTs. The reaction rate decreases in the order of metallic SWNTs > semiconducting SWNTs and small-diameter SWNTs > large-diameter SWNTs. Control experiments conducted under various experimental conditions and ESR and femtosecond laser flash photolysis measurements revealed that the helicity-selective reaction proceeds via a photoinduced electron transfer reaction. The PL and <I>I</I>–<I>V</I> measurements showed that the photoreaction is effective not only to control SWNT conductivity but also for the band gap modulation of semiconducting SWNTs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2013/jacsat.2013.135.issue-16/ja402199n/production/images/medium/ja-2013-02199n_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja402199n'>ACS Electronic Supporting Info</A></P>
Imamura, Hiroshi,Hasegawa, Yutaka,Murata, Junsuke,Chihara, Sho,Takezaki, Daisuke,Kamiya, Naotsugu Korean Society for Fluid machinery 2009 International journal of fluid machinery and syste Vol.2 No.3
Since large-scale commercial wind turbine generator systems such as MW-class wind turbines are becoming widely operated, the vibration and distortion of the blade are becoming larger and larger. Therefore the soft structure design instead of the solid-design is one of the important concepts to reduce the structural load and the cost of the wind turbine rotors. The objectives of the study are development of the fluid-structure coupled analysis code and evaluation of soft rotor-blade design to reduce the unsteady structural blade load. In this paper, fluid-structure coupled analysis for the HAWT rotor blade is performed by free wake panel method coupled with hinge-spring blade model for the flapwise blade motion. In the model, the continuous deflection of the rotor blade is represented by flapping angle of the hinge with one degree of freedom. The calculation results are evaluated by comparison with the database of the NREL unsteady aerodynamic experiment. In the analysis the unsteady flapwise moments in yawed inflow conditions are compared for the blades with different flapwise eigen frequencies.
Study on strength of reinforced concrete filled circular steel tubular columns
Hai-Jun Wang,Akira Hasegawa,Wei Hua,Yukitake Shioi,Shoji Iwasaki,Yutaka Miyamoto 국제구조공학회 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.19 No.6
Concrete filed steel tubular columns (CFT) are widely used in civil engineering works,especially in large scale of works because of high strength, deformation, toughness and so on. On thein Hansin-Awaji earthquake of Japan in 1995, reinforced concrete piers were wrapped with steel plate.Then, a new kind of structure appeared, that is, reinforced concrete filed steel tubular column (RCFT). Inthis paper, compresion test and bending-shearing test on RCFT are carried out. The main parameters of(4) arrangement of reinforcing bars. According to the experimental results, the effect of parameters onmechanical characteristics of RCFT is analyzed clearly. At the same time, strength evaluation formula forRCFT column is proposed and tested by experimental results and existed recommendations (AIJ 197).proposed evaluation formula can evaluate the strength of RCFT column properly.