Photochemically controlled supramolecular curdlan/single-walled carbon nanotube composite gel: Preparation of molecular distaff by cyclodextrin modified curdlan and phase transition control

Shingo Tamesue, Yoshinori Takashima, Hiroyasu Yamaguchi, Seiji Shinkai, Akira Harada

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We propose a single-walled carbon nanotube (SWNT) composite with a molecular recognition property, which is prepared by mixing α- cyclodextrin-modified curdlan (CD-CUR) with SWNTs in water. The visible/near-infrared (Vis/NIR) spectrum of the CD-CUR/SWNT composite exhibits characteristic absorption bands corresponding to the band-gap transitions for van Hove singularities of metallic and semiconductor carbon nanotubes. The structure of the CD-CUR/SWNT composites was characterized by transmission electron microscopy (TEM) and atomic force microscopy (AFM). The TEM and AFM images show that the CD-CUR/SWNT composite exhibits dispersed fibers with a narrow fiber diameter distribution, which suggests that CD-CUR helically wraps around SWNTs to form one-dimensional superstructural composites. Because we hypothesized that the CD-CUR/SWNT composite possesses a molecular recognition property, we attempted to create supramolecular hydrogels containing SWNTs by using a CD-CUR/SWNT composite and a guest polymer (pAC12Azo) with an azobenzene guest pendant. The CD-CUR/SWNT composite selectively forms supramolecular hydrogels with pAC12Azo. UV irradiation (λ= 365 nm) of the supramolecular hydrogel decreases the viscosity upon isomerization of the trans-azo group to give the sol. In contrast, irradiation with visible light at λ= 430 nm (or heating) of the sol state recovers the viscosity to restore the hydrogel within 2 min, indicating that irradiation affects the association and dissociation between the α-CD unit and the azobenzene unit during phase transition. In summary, we demonstrate the formation of a CD-CUR/SWNT composite and a photoresponsive sol-gel supramolecular SWNT hydrogel.

Original languageEnglish
Pages (from-to)2801-2806
Number of pages6
JournalEuropean Journal of Organic Chemistry
Issue number15
DOIs
Publication statusPublished - May 1 2011
Externally publishedYes

Fingerprint

Cyclodextrins
Single-walled carbon nanotubes (SWCN)
Phase transitions
Gels
carbon nanotubes
gels
preparation
composite materials
Composite materials
Hydrogel
Molecular recognition
Hydrogels
Irradiation
Polymethyl Methacrylate
Atomic force microscopy
irradiation
Viscosity
Transmission electron microscopy
curdlan
atomic force microscopy

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Organic Chemistry

Cite this

Photochemically controlled supramolecular curdlan/single-walled carbon nanotube composite gel : Preparation of molecular distaff by cyclodextrin modified curdlan and phase transition control. / Tamesue, Shingo; Takashima, Yoshinori; Yamaguchi, Hiroyasu; Shinkai, Seiji; Harada, Akira.

In: European Journal of Organic Chemistry, No. 15, 01.05.2011, p. 2801-2806.

Research output: Contribution to journalArticle

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