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Title: Self-Organized Micro-Spiral of Single-Walled Carbon Nanotubes
Authors: Mae, Keisuke
Toyama, Hidetoshi
Nawa-Okita, Erika
Yamamoto, Daigo
Chen, Yong-Jun
Yoshikawa, Kenichi
Toshimitsu, Fumiyuki
Nakashima, Naotoshi
Matsuda, Kazunari  kyouindb  KAKEN_id
Shioi, Akihisa
Author's alias: 松田, 一成
Keywords: Chemical physics
Issue Date: 13-Jul-2017
Publisher: Springer Nature
Journal title: Scientific Reports
Volume: 7
Thesis number: 5267
Abstract: Single-walled carbon nanotubes (SWCNTs) are reported to spontaneously align in a rotational pattern by drying a liquid droplet of toluene containing polyfluorene as a dispersant. By situating a droplet of an SWCNT solution around a glass bead, spiral patterns are generated. The parallel alignment of SWCNTs along one stripe of such a pattern is confirmed using scanning electron microscopy and polarized optical microscopy. The orientation order increases toward the outer edge of a stripe. The stripe width in the pattern is proportional to the solute concentration, and the width and position of the stripes follow geometric sequences. The growth of the rotational pattern is also observed in real time. The process of spiral pattern formation is visualized, indicating the role of the annihilation of counter-traveling accompanied by continuous depinning. The geometric sequences for the stripe width and position are explained by the near-constant traveling speed and solute enrichment at the droplet periphery.
Rights: © The Author(s) 2017
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
DOI(Published Version): 10.1038/s41598-017-05558-9
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