Research ArticleNANOMATERIALS

Structural transitions and guest/host complexing of liquid crystal helical nanofilaments induced by nanoconfinement

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Science Advances  10 Feb 2017:
Vol. 3, no. 2, e1602102
DOI: 10.1126/sciadv.1602102
  • Fig. 1 Material information and GIXD investigation showing the perfectly controlled 5CB molecules guided along the helical geometries of the prealigned HNFs in the nanoconfined geometries (dAAO = 60 nm, L = 5 mm).

    (A) Molecular configurations of 5CB and NOBOW. (B) 1D GIXD spectrum that provides the quantitative information of interlayering and clustering for the confined NOBOW and 5CB in the small-angle region. a.u., arbitrary units. (C to E) 2D GIXD patterns acquired from pure NOBOW (blue line) (C), pure 5CB (pink line) (D), and their 50 wt % mixtures (purple line) (E) with the model sketches of each system.

  • Fig. 2 In situ GIXD analysis tracing the thermal history of the 5CB-NOBOW 50:50 mixture in AAO upon cooling (dAAO = 60 nm).

    (A) Acquired 2D in situ GIXD images of neat NOBOW. (B) 1D vertical linecut for the 50 wt % mixture in the q range of 0.6 to 3.5 nm−1, showing the evolution of the 2D diffraction peaks from the mixture and the 2D diffraction pattern. (C) In situ GIXD images of the 50:50 mixture of 5CB/NOBOW.

  • Fig. 3 Comparison of the host templating HNF morphologies using SEM and TEM methods.

    (A) Pure NOBOW and (B) the NOBOW-5CB 50:50 mixture after selective removal of 5CB in EtOH. Schematic illustrations are included in the inset images for the nanoconfined binary mixture of 5CB/NOBOW.

  • Fig. 4 Schemes of 5CB/NOBOW ordering confined in chiral nanopores.

    (A) Dimensional measurement of helical voids generated in between the AAO wall and pretransitioned HNF backbone when used as the channels (dAAO = 60 nm). (B) Configuration of the smectic A (SmA)–like ordering of 5CB confined in AAO/HNF.

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/3/2/e1602102/DC1

    fig. S1. POM images of NOBOW/5CB binary mixtures with the different mixing ratio.

    fig. S2. SEM observation on the morphological changes of 5CB/NOBOW mixtures in AAO (dAAO = 60 nm) over the various mixing ratio.

    fig. S3. SEM observation on the self-generated chiral porous nanostructures from pure NOBOW.

    fig. S4. Geometry of in situ GIXD measurement for the simultaneous investigation of the molecular orientation and layer arrangement over the whole thermal LC phase transition.

    fig. S5. Solvent damage tests on the HNF morphology with EtOH.

    fig. S6. Contact angle measurement to quantitatively confirm the relative mutual interaction forces with the various interfacial conditions.

    fig. S7. 2D GIXD patterns comparing the pure 5CB and 8CB confined in AAO nanochannels (dAAO = 60 nm).

    fig. S8. GIXD and SEM observations to confirm the optimal range of the spatial dimension of AAO for the successful confinement of 5CB/NOBOW mixture.

  • Supplementary Materials

    This PDF file includes:

    • fig. S1. POM images of NOBOW/5CB binary mixtures with the different mixing ratio.
    • fig. S2. SEM observation on the morphological changes of 5CB/NOBOW mixtures in AAO (dAAO = 60 nm) over the various mixing ratio.
    • fig. S3. SEM observation on the self-generated chiral porous nanostructures from pure NOBOW.
    • fig. S4. Geometry of in situ GIXD measurement for the simultaneous investigation of the molecular orientation and layer arrangement over the whole thermal LC phase transition.
    • fig. S5. Solvent damage tests on the HNF morphology with EtOH.
    • fig. S6. Contact angle measurement to quantitatively confirm the relative mutual interaction forces with the various interfacial conditions.
    • fig. S7. 2D GIXD patterns comparing the pure 5CB and 8CB confined in AAO nanochannels (dAAO = 60 nm).
    • fig. S8. GIXD and SEM observations to confirm the optimal range of the spatial dimension of AAO for the successful confinement of 5CB/NOBOW mixture.

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