論文

査読有り
2011年10月

Hydration-Responsive Folding and Unfolding in Graphene Oxide Liquid Crystal Phases

ACS NANO
  • Fei Guo
  • ,
  • Franklin Kim
  • ,
  • Tae Hee Han
  • ,
  • Vivek B. Shenoy
  • ,
  • Jiaxing Huang
  • ,
  • Robert H. Hurt

5
10
開始ページ
8019
終了ページ
8025
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1021/nn2025644
出版者・発行元
AMER CHEMICAL SOC

Graphene oxide is promising as a plate-like giant molecular building block for the assembly of new carbon materials. Its water dispersibility, liquid crystallinity, and ease of reduction offer advantages over other carbon precursors if Its fundamental assembly rules can be Identified. This article shows that graphene oxide sheets of known lateral dimension form nematic liquid crystal phases with transition points in agreement with the Onsager hard-plate theory. The liquid crystal phases can be systematically ordered into defined supramolecular patterns using surface anchoring, complex fluid flow, and microconfinement. Graphene oxide is seen to exhibit homeotropic surface anchoring at interfaces driven by excluded volume entropy and by adsorption enthalpy associated with its partially hydrophobic basal planes. Surprisingly, some of the surface-ordered graphene oxide phases dry into graphene oxide solids that undergo a dramatic anisotropic swelling upon rehydration to recover their initial size and shape. This behavior is shown to be a unique hydration-responsive folding and unfolding transition. During drying, surface tension forces acting parallel to the layer planes cause a buckling in-stability that stores elastic energy In accordion-folded structures in the dry solid. Subsequent water infiltration reduces interlayer frictional forces and triggers release of the stored elastic energy in the form of dramatic unidirectional expansion. We explain the folding/unfolding phenomena by quantitative nanomechanics and introduce the potential of liquid crystal-derived graphene oxide phases as new stimuli-response materials.

Web of Science ® 被引用回数 : 163

リンク情報
DOI
https://doi.org/10.1021/nn2025644
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000296208700053&DestApp=WOS_CPL
ID情報
  • DOI : 10.1021/nn2025644
  • ISSN : 1936-0851
  • Web of Science ID : WOS:000296208700053

エクスポート
BibTeX RIS