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(252) Production(s) de BLANC C.
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Interface CL-substrat solide: une étude du désordre figé
Auteur(s): Nespoulous Mathieu, Blanc C., Nobili M.
Conference: Colloque Franco-phone des cristaux liquides 2007 (Pessac, FR, 2007-09-10)
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Lyotropic structures in a thermotropic liquid crystal 
Auteur(s): Toquer Guillaume, Porte Grégoire, Nobili M., Appell Jacqueline, Blanc C.
(Article) Publié:
Langmuir, vol. 23 p.4081 (2007)
Texte intégral en Openaccess : 
Ref HAL: hal-01208070_v1
PMID 17316029
DOI: 10.1021/la062024a
WoS: 000245012900081
Exporter : BibTex | endNote
9 Citations
Résumé: We have investigated the nature of didodecyldimethylammonium bromide (DDAB)/water aggregates dispersed in4-n-pentyl-4¢-cyanobiphenyl thermotropic liquid crystal (5CB). The structure of this microemulsion has been probedby small-angle neutron and X-ray scattering experiments far above the nematic-to-isotropic phase transition temperatureof the solvent. Our data show that the stability of this system is controlled by strong attractive van der Waals interactionsbetween spherical inverted micelles. These interactions also explain why other swollen mesophases in related cosurfactant/DDAB/water/5CB phase diagrams are not observed. When approaching the isotropic-to-nematic phase transition,scattering experiments additionally confirm the predominance of an increasing attractive interaction due to the 5CBparanematic fluctuations.
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Ultraweak azimuthal anchoring of a nematic liquid crystal on a planar orienting photopolymer
Auteur(s): Nespoulous Mathieu, Blanc C., Nobili M.
(Article) Publié:
Journal Of Applied Physics, vol. 102 p.073519 (2007)
Ref HAL: hal-01208084_v1
DOI: 10.1063/1.2784974
WoS: 000250147700039
Exporter : BibTex | endNote
15 Citations
Résumé: The search of weak anchoring is an important issue for a whole class of liquid crystal displays. In this paper we present an orienting layer showing unreached weak planar azimuthal anchoring for 4-n-pentyl-4′-cyanobiphenyl nematic liquid crystal (5CB). Azimuthal extrapolation lengths as large as 80μm are easily obtained. Our layers are made with the commercial photocurable polymer Norland optical adhesive 60. The anisotropy of the film is induced by the adsorption of oriented liquid crystal molecules under a 2Tmagnetic field applied parallel to the surfaces. We use the width of surfaceπ-walls and a high-field electro-optical method to measure, respectively, the azimuthal and the zenithal anchorings. The azimuthal anchoring is extremely sensitive to the ultraviolet (UV) dose and it also depends on the magnetic field application duration. On the opposite, the zenithal anchoring is only slightly sensitive to the preparation parameters. All these results are discussed in terms of the adsorption/desorption mechanisms of the liquid crystal molecules on the polymer layer and of the flexibility of the polymer network.
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Nematic lyotropic nanotube suspensions : orientational order and optical properties
Auteur(s): Zamora-Ledezma C., Maugey M., Zakri C., Poulin P., Blanc C., Anglaret E.
Conference: Annual meeting (Autrans-France, FR, 2007)
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Aqueous lyotropic liquid crystals of carbon nanotubes : orientational order and optical properties
Auteur(s): Zamora-Ledezma C., Maugey M., Zakri C., Poulin P., Blanc C., Anglaret E.
Conference: Colloque francophone des cristaux liquides (Bordeaux, France, FR, 2007-09-10)
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Shape Instability in Nematic/W Emulsions Induced by Amphitropic Surfactants
Auteur(s): Blanc C.
Conference: 9 th European Conference on Liquid Crystals (Lisbonne, Portugal, FR, 2007-07-02)
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Insights into self structuring of a long range ordered phenylene bridged silesquiooxane : in siti time resolved X-ray experiments
Auteur(s): Dieudonne-George P., Bantignies J.-L., Blanc C., Creff Gaelle, Sauvajol J.-L., Pichon B., Vellutini L., Wong Chi Man M., Bied C., Moreau J., Pritzkow H., Finet S.
(Affiches/Poster)
International sol-gel conference (Montpellier, France, FR), 2007-09-04 |
