Photoinduced alignment of nanocylinders by supramolecular cooperative motions

Chemical Resources Laboratory, Tokyo Institute of Technology, R1-11, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
Journal of the American Chemical Society (Impact Factor: 11.44). 09/2006; 128(34):11010-1. DOI: 10.1021/ja064148f
Source: PubMed

ABSTRACT A linearly polarized laser beam was used to control nanocylinders self-assembled in an amphiphilic diblock liquid-crystalline copolymer consisting of flexible poly(ethylene oxide) as a hydrophilic block and poly(methacrylate) containing an azobenzene moiety in the side chain as a hydrophobic liquid-crystalline segment. The perfect array of poly(ethylene oxide) nanocylinders was achieved, aligned perpendicularly to the polarization direction of the actinic light by supramolecular cooperative motions between the ordered azobenzene and microphase separation. By the simple and convenient way of photocontrol, the macroscopic parallel patterning of nanocylinders can be easily obtained in an arbitrary area.

  • [Show abstract] [Hide abstract]
    ABSTRACT: A novel amphiphilic copolymer poly(ethylene glycol)-block-poly(N,N-dimethylamino-2-ethylmethacrylate)-blockpoly[6-(4-methoxy-azobenzene-4′-oxy) hexyl methacrylate] (PEG-b-PDMAEMA-b-PMMAzo) was prepared by ATRP polymerization. The self-assembly and responsive behaviors were investigated by SEM, TEM, LLS and UV-Vis spectra. The results indicated that the copolymers can self-assemble into spherical structures in aqueous media. The aggregate size can be tuned by pH and temperature. The trans-cis isomerization behavior of the formed aggregates was also examined. Upon irradiation with a linear polarized light, the elongation degree of the aggregates was increased with the irradiation time.
    Chinese Journal of Polymer Science 05/2013; 31(5). DOI:10.1007/s10118-013-1283-y · 1.42 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Photocontrol of molecular alignment is an exceptionally-intelligent and useful strategy. It enables us to control optical coefficients, peripheral molecular alignments, surface relief structure, and actuation of substances by means of photoirradiation. Azobenzene-containing polymers and functionalized liquid crystalline polymers are well-known photocontrollable materials. In this paper, we introduce recent applications of these materials in the fields of mechanics, self-organized structuring, mass transport, optics, and photonics. The concepts in each application are explained based on the mechanisms of photocontrol. The interesting natures of the photocontrollable materials and the conceptual applications will stimulate novel ideas for future research and development in this field.
    Polymers 03/2012; 4(1). DOI:10.3390/polym4010150 · 2.51 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: New developments in research of photoresponsive polymer thin film systems that exhibit new performances are reviewed. Topics introduced here involve surface photoalignment of mesostructured materials, photomechanical responses, photo-triggered efficient mass migrations, photoalignment and patterning of microphase separated nanostructures in block copolymers and preparation of surface-grafted photoresponsive polymers. Most of the systems utilize liquid crystalline materials and are designed as to exert cooperative self-assembling motions to provide uniform or patterned structures and orientations. These prototypes are anticipated to provide significant clues to create new smart responsive systems for the future science and technology of soft materials.
    Current Opinion in Solid State and Materials Science 10/2006; DOI:10.1016/j.cossms.2007.08.002 · 7.17 Impact Factor