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2 article(s) from Lagerwall, Jan

Self-assembled ordered structures in thin films of HAT5 discotic liquid crystal

Piero Morales,
Jan Lagerwall,
Paolo Vacca,
Sabine Laschat and
Giusy Scalia

Beilstein J. Org. Chem. 2010, 6, No. 51, doi:10.3762/bjoc.6.51

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Graphical Abstract

Scheme 1: Hexapentyloxytriphenylene (HAT5).

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Figure 1: Optical microscopy textures of a film prepared by drop-casting on heating to the isotropic phase an...

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Figure 2: Optical microscopy images of a spin-coated sample with linear structures thick enough to be detecte...

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Figure 3: AFM scan of a thick rope, of similar size to the linear structures observed by optical microscopy. ...

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Figure 4: Thinner, isolated fibers, similar to the ones constituting the larger rope in Figure 3 are present in other...

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Figure 5: Small, elongated aggregates form a nematic-like texture, possibly due to the formation of a lyonema...

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Figure 6: AFM image of a spin-coated sample from a solution of 6 mg/ml. Below the surface profile along the w...

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Figure 7: AFM image of the sample prepared from a concentration of 3 mg/ml.

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Figure 8: Surface topography of the sample prepared from a concentration of 1.5 mg/ml visualized by AFM. The ...

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Figure 9: Higher resolution scans of the fiber structure of the low concentration sample.

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Full Research Paper

Published 20 May 2010

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Coaxial electrospinning of liquid crystal-containing poly(vinylpyrrolidone) microfibres

Eva Enz,
Ute Baumeister and
Jan Lagerwall

Beilstein J. Org. Chem. 2009, 5, No. 58, doi:10.3762/bjoc.5.58

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Graphical Abstract

Figure 1: Schematic illustration of the main parts of the setup used in our lab for coaxial electrospinning a...

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Figure 2: Polarizing optical microscopy photographs of 8CB-containing composite fibres; (a) SmA phase at room...

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Figure 3: Microscopy photographs of characteristic samples when varying the flow rate of the liquid crystal [Graphic 1] _in...

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Figure 4: Outer fibre diameters as a function of LC flow rate as determined from 50 measurements by optical m...

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Figure 5: DSC thermograms on heating of 8CB as bulk and as inclusion compound in PVP fibres produced with dif...

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Figure 6: The liquid crystal core shows a transformation from bubbly to smooth and to bubbly again with incre...

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Figure 7: Influence of the applied voltage and the flow rate of the polymer solution on the mean fibre diamet...

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Figure 8: a), b): 2D X-ray diffraction pattern of oriented fibres at two perpendicular roll-up directions sch...

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Figure 9: X-ray diffraction patterns of PVP fibres without LC (a) and of surface-aligned samples of bulk 8CB ...

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Figure 10: Schematic sketch of the arrangement of LC molecules and the smectic layers in an electrospun fibre.

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Full Research Paper

Published 23 Oct 2009

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