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Muramatsu, Hiroyuki,Takahashi, Masahiro,Kang, Cheon-Soo,Kim, Jin Hee,Kim, Yoong Ahm,Hayashi, Takuya The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.34
<P>We demonstrate selective nitrogen doping on the outer tubes of double walled carbon nanotubes by nitrogen plasma treatment. Such selectivity improves the chemical activity of the outer tubes, including their wettability and oxygen reduction reaction properties, while retaining the structural, optical, and electrical properties of the inner tubes.</P>
Carcinoma ex Pleomorphic Adenoma Including Two Carcinoma Components Arising in the Palate
Hiroyuki Kaneko,Takashi Muramatsu,Kitaro Onozawa,Hisashi Yano,Mami Owada,Hiroyuki Abe 대한구강악안면병리학회 2012 대한구강악안면병리학회지 Vol.36 No.2
Carcinoma ex pleomorphic adenoma is a rare malignant salivary gland tumor. The carcinomatous component of the carcinoma ex pleomorphic adenoma is mostly one type such as adenocarcinoma NOS, salivary duct carcinoma and undifferentiated carcinoma. We present a case of carcinoma ex pleomorphic adenoma including two carcinomatous components. The tumor occurred in the palate of a 70-year-old man. Histopathologically, the tumor was composed of both benign pleomorphic adenoma and the carcinoma area that showed adenocarcinoma NOS and squamous cell carcinoma. Finally this case was diagnosed as carcinoma ex pleomorphic adenoma including two carcinomatous components.
경구개에서 발생한 두 암종 요소를 포함한 다형성 선종으로부터 유래된 암종
Hiroyuki Kaneko,Takashi Muramatsu,Kitaro Onozawa,Hisashi Yano,Mami Owada,Hiroyuki Abe 대한구강악안면병리학회 2012 대한구강악안면병리학회지 Vol.36 No.2
Carcinoma ex pleomorphic adenoma is a rare malignant salivary gland tumor. The carcinomatous component of the carcinoma ex pleomorphic adenoma is mostly one type such as adenocarcinoma NOS, salivary duct carcinoma and undifferentiated carcinoma. We present a case of carcinoma ex pleomorphic adenoma including two carcinomatous components. The tumor occurred in the palate of a 70-year-old man. Histopathologically, the tumor was composed of both benign pleomorphic adenoma and the carcinoma area that showed adenocarcinoma NOS and squamous cell carcinoma. Finally this case was diagnosed as carcinoma ex pleomorphic adenoma including two carcinomatous components
Hydrolytic Unzipping of Boron Nitride Nanotubes in Nitric Acid
Kim, Dukeun,Muramatsu, Hiroyuki,Kim, Yoong Ahm Springer US 2017 Nanoscale research letters Vol.12 No.1
<P>Boron nitride nanoribbons (BNNRs) have very attractive electrical and optical properties due to their unique edge states and width-related properties. Herein, for the first time, BNNRs were produced by a simple reflux of boron nitride nanotubes (BNNTs) in nitric acid containing water, which had led to unzipped sidewalls through hydrolysis. Their high reactivity that originated from edges was verified via a strong interaction with methylene blue.</P>
Jung, Yong Chae,Muramatsu, Hiroyuki,Hayashi, Takuya,Kim, Jin Hee,Kim, Yoong Ahm,Endo, Morinobu,Dresselhaus, Mildred S. WILEY‐VCH Verlag 2010 European journal of inorganic chemistry Vol.2010 No.27
<P><B>Abstract</B></P><P>We carried out covalent functionalization of single‐ and double‐walled carbon nanotubes (SWNTs and DWNTs) comparatively by using isocyanate chemistry. The introduction of aromatic diisocyanate on the sidewalls of the tubes was verified by the strong IR peak around 2272 cm<SUP>–1</SUP> arising from the NCO asymmetric stretching mode, by the intensified sp<SUP>3</SUP> peak at 285.2 eV in the C1s photoemission spectra, and by a typical TEM image of the amorphous‐like coating. The suppression of the optical properties in a covalently isocyanate‐functionalized SWNT is due to a breakdown of the van Hove singularities, whereas the strong optical activity in a covalently isocyanate‐functionalized DWNT originates from the geometrically shielded inner tubes. The chemically active isocyanate groups at the end of the phenyl diisocyanate that are covalently attached to the sidewalls of the DWNTs will allow us to utilize isocyanate chemistry in synthesizing functional organic–inorganic hybrid materials as well as high‐performance polymer composites.</P>
Double-walled carbon nanotubes: synthesis, structural characterization, and application
Kim, Yoong Ahm,Yang, Kap-Seung,Muramatsu, Hiroyuki,Hayashi, Takuya,Endo, Morinobu,Terrones, Mauricio,Dresselhaus, Mildred S. 한국탄소학회 2014 Carbon Letters Vol.15 No.2
Double walled carbon nanotubes (DWCNTs) are considered an ideal model for studying the coupling interactions between different concentric shells in multi-walled CNTs. Due to their intrinsic coaxial structures they are mechanically, thermally, and structurally more stable than single walled CNTs. Geometrically, owing to the buffer-like function of the outer tubes in DWCNTs, the inner tubes exhibit exciting transport and optical properties that lend them promise in the fabrication of field-effect transistors, stable field emitters, and lithium ion batteries. In addition, by utilizing the outer tube chemistry, DWCNTs can be useful for anchoring semiconducting quantum dots and also as effective multifunctional fillers in producing tough, conductive transparent polymer films. The inner tubes meanwhile preserve their excitonic transitions. This article reviews the synthesis of DWCNTs, their electronic structure, transport, and mechanical properties, and their potential uses.
Role of Intertube Interactions in Double- and Triple-Walled Carbon Nanotubes
Hirschmann, Thomas Ch.,Araujo, Paulo T.,Muramatsu, Hiroyuki,Rodriguez-Nieva, Joaquin F.,Seifert, Max,Nielsch, Kornelius,Kim, Yoong Ahm,Dresselhaus, Mildred S. American Chemical Society 2014 ACS NANO Vol.8 No.2
<P>Resonant Raman spectroscopy studies are performed to access information about the intertube interactions and wall-to-wall distances in double- and triple-walled carbon nanotubes. Here, we explain how the surroundings of the nanotubes in a multiwalled system influence their radial breathing modes. Of particular interest, the innermost tubes in double- and triple-walled carbon nanotube systems are shown to be significantly shielded from environmental interactions, except for those coming from the intertube interaction with their own respective host tubes. From a comparison of the Raman results for bundled as well as individual fullerene-peapod-derived double- and triple-walled carbon nanotubes, we observe that metallic innermost tubes, when compared to their semiconducting counterparts, clearly show weaker intertube interactions. Additionally, we discuss a correlation between the wall-to-wall distances and the frequency upshifts of the radial breathing modes observed for the innermost tubes in individual double- and triple-walled carbon nanotubes. All results allow us to contemplate fundamental properties related to DWNTs and TWNTs, as for example diameter- and chirality-dependent intertube interactions. We also discuss differences in fullerene-peapod-derived and chemical vapor deposition grown double- and triple-walled systems with the focus on mechanical coupling and interference effects.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-2/nn500420s/production/images/medium/nn-2014-00420s_0008.eps'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn500420s'>ACS Electronic Supporting Info</A></P>
강천수,고영일,Fujisawa Kazunori,Yokokawa Taiki,김진희,한종훈,위재형,김융암,Muramatsu Hiroyuki,Hayashi Takuya 한국탄소학회 2020 Carbon Letters Vol.30 No.5
Free-standing hybridized electrode consisting of double-walled carbon nanotubes (DWNTs) and activated carbon have been fabricated for fexible supercapacitor applications. The xanthan-gum, used in our methodology, showed high ability in dispersing the strongly bundled DWNTs, and was then efectively converted to activated carbon with large surface area via chemical activation. The homogeneously dispersed DWNTs within xanthan-gum derived activated carbon acted as both electrical path and mechanical support of electrode material. The hybridized flm from highly dispersed DWNTs and activated carbon was mechanically strong, has high electrical conductivity, and exhibited high specifc capacitance of 141.5 F/g at the current density of 100 mV/s. Our hybridized flm is highly promising as electrode material for fexible supercapacitors in wearable device.