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나노 구조 물리 연구단
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Electrophoretic assembly and topological weaving of crumpled two-dimensional sheets with entangled defect loops

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Title
Electrophoretic assembly and topological weaving of crumpled two-dimensional sheets with entangled defect loops
Author(s)
Wijewardhana K.R.; Tian-Zi Shen; Vengatesan M.R.; Joosung Kim; Hyoyoung Lee; Jang-Kun Song
Publication Date
2017-08
Journal
CARBON, v.119, no., pp.211 - 218
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
Transport, relocation, and self-assembly of nano and microparticles in colloidal systems are highly demanded in nanotechnology, photonics, microfluidics, and biotechnology; topological charges can provide an effective means for these purposes. We report that crumpled two-dimensional (2D) graphene oxide (GO) particle sheets in nematic fields can serve as a nest for complicated topological defect loops, which, in turn, provide mobility and inter-adhesiveness to the GO particles. The application of electric fields actuated the GO particles orthogonally, inducing their coalescence into large radial clusters upon absorption of other GO particles. In contrast, in the isotropic phase, where no topological defects existed, the GO particles electrostatically repelled each other owing to the presence of surface charges with equal sign. We also demonstrate that predesigned shallow surface trenches on a substrate can anchor seed GO particles, which attract other GO particles to create a macroscopic structure along the trench. © 2017 Elsevier Lt
URI
https://pr.ibs.re.kr/handle/8788114/3645
ISSN
0008-6223
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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