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(174) Production(s) de ANGLARET E.
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Structure and texture of anisotropic nematic gels.
Auteur(s): Gautier P., Brunet Monique, Grupp J., Noirez L., Anglaret E.
(Article) Publié:
Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 68 p.011709 (2003)
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Raman investigation of stable and metastable states of 4-octyl-4 '-cyanobiphenyl confined in porous silica matrices
Auteur(s): Fehr Catherine, Dieudonne-George P., Sauvajol J.-L., Anglaret E.
(Article) Publié:
Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 67 p.061706 (2003)
Résumé: We study the polymorphism of solid phases of 4-octyl-4'-cyanobiphenyl (8CB) by Raman spectroscopy. For bulk 8CB, the Raman spectrum of the CN stretch is featured by a single peak, which shifts abruptly at the smectic-A-crystal transition. In confinement, the CN peak splits both at high and low temperatures. In the isotropic and liquid crystal phases, the signature of the liquid crystal bulk (LC) coexists with another peak that is assigned to LC molecules interacting with the matrice interface. We find correlations between the volumic fractions of interfacial liquid and the texture of the matrices. At low temperatures, we assign the splitting of the CN peak to the coexistence of different metastable solid phases. For strong confinements, the temperature dependence of the CN stretching frequency extends to that of the liquid, which suggests the existence of frozen-in smecticlike solid phases. We discuss the structure of these metastable solid phases in the light of neutron diffraction measurements. We also report on the peculiar analogy between the effect of quenched disorder due to the porous matrices and the effect of thermal quenching.
Commentaires: Part 1 061706
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Solid state polymorphism of liquid crystals in confined geometries
Auteur(s): Fehr Catherine, Dieudonne-George P., Primera J., Woignier Thierry, Sauvajol J.-L., Anglaret E.
(Article) Publié:
European Physical Journal E, vol. 12 p.S13-S16 (2003)
Résumé: Solid polymorphism of 4-alkyl-4'-cyanobiphenyl (nCB) was studied so far as a function of thermal history. In this paper we show that metastable solid phases of 4-octyl-4'-cyanobiphenyl (8CB) are also formed when the mesogens are confined in porous silica matrices and we study their structure by neutron diffraction and by Raman spectroscopy. Three metastable solid states are identified : one crystalline phase K', two frozen-in smectic-like phases K-s and K'(s). We discuss the relation between the structure of the metastable solid phases and that of the mesomorph phases.
Commentaires: Suppl. 1
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Nanotubes for optical limiting.
Auteur(s): Anglaret E.
Conference: International Winterschool on Electronic properties of Novel Materials 2003 (Kirchberg, Austria, FR, 2003-03-09)
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Spectroscopie Raman et absorption optique des nanotubes de carbone
Auteur(s): Anglaret E.
Conference: Ecole "Nanotubes : Science et Applications" (Aussois, FR, 2003-04-21)
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Optical limiting properties of suspensions of singlewall carbon nanotubes.
Auteur(s): Vivien L., Izard N., Riehl D., Hache F., Anglaret E.
Conference: International Workshop on Electronic properties of novel materials (Kirchberg, AT, 2003)
Actes de conférence: AIP Conference Proceedings, vol. 685 p.559 (2003)
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Multi-spectroscopic investigation of the structure of single-wall carbon nanotubes 
Auteur(s): Izard N., Riehl Didier, Anglaret E.
Conference: (, FR, 2003)
Actes de conférence: AIP Conference Proceedings Vol 685, vol. p.235-240 (2003)
Texte intégral en Openaccess : 
Ref HAL: hal-00003925_v1
Ref Arxiv: cond-mat/0501426
DOI: 10.1063/1.1628025
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: We present a multispectroscopic structural study of various nanotube samples with different tube diameters. We determine for each sample the mean bundle and tube diameter as well as the tube diameter distribution. The possibility to work on SWNT of various structural characteristics opens new opportunities to correlate the nanotube structure and their physical properties.
Commentaires: Conférence : 8 au 15 mars 2003
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