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(110) Production(s) de LORMAN V.
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Aligning Properties of Slippery Surfaces in Anticlinic-antiferroelectric LC Cells
Auteur(s): Vella A., Lorman V., Blanc C., Nobili M., Sawade H., Heppke G.
Conference: 20th Internationale Liquid Crystal Conference (ILCC 2004) (Ljubljana, SI, 2004-07-04)
Commentaires: Poster contribution at the 20th International Liquid Crystal Conference
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Phase Behavior of DNA; Hexatic, Distorted Hexatic and Crystalline Order
Auteur(s): Manna Federico, Lorman V., Podgornik R., Zeks B.
Conference: 20th Internationale Liquid Crystal Conference (ILCC 2004) (Ljubljana, SI, 2004-07-04)
Actes de conférence: Proceedings 20th Intern. Liquid Crystal Conf., vol. BIOL-PO22 p.363 - (2004)
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Order in High Density DNA Mesophases
Auteur(s): Lorman V., Podgornik R., Zeks B.
Conference: 20th Internationale Liquid Crystal Conference (ILCC 2004) (Ljubljana, SI, 2004-07-04)
Actes de conférence: Proceedings of the 20th International Liquid Crystal Conference, vol. BIOL p.83- (2004)
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Structure and Properties of New de Vries SmA* Liquid Crystals 
Auteur(s): Reihmann Matthias, Crudeli Alessandro, Blanc C., Lorman V., Panarin Yuri P., Vij Jagdish K., Olsson Nils, Galli Giancarlo
(Article) Publié:
Ferroelectrics, vol. 309 p.111 (2004)
Ref HAL: hal-01212565_v1
DOI: 10.1080/00150190490510050
WoS: 000226091900013
Exporter : BibTex | endNote
9 Citations
Résumé: We synthesized a chiral mesogen AC11 and two different siloxanes MSi2-AC11 and DSi3-AC11 derived from it by a hydrosilylation reaction. The effects of varying the molecular architecture were investigated with special attention being devoted to the occurrence of the de Vries SmA* phase. Strong hints that all the three molecules follow the scenario suggested by de Vries were found in the behavior of the susceptibility by studies of their electrooptical response in the SmA* phase. In particular, DSi3-AC11 containing two mesogens interconnected by a siloxane spacer presented a critical exponent γ as high as 1.97, indicating a practically pure de Vries behavior. Temperature-dependent X-ray analysis revealed that the three materials underwent a small layer shrinkage at the SmA*–SmC* transition.
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The Alignment of Liquid Crystals on Semifluorinated Polyacrylate
Auteur(s): Brunet M., Lorman V., Galli G., Chiellini E., Pavel J., Da sylva J.
(Article) Publié:
Ferroelectrics, vol. 310 p.25 - 29 (2004)
Ref HAL: hal-00347978_v1
DOI: 10.1080/00150190490510221
WoS: 000226092000004
Exporter : BibTex | endNote
Résumé: We synthesized a sample of poly (1H, 1H, 2H, 2H-perfluorododecyl acrylate) (P11) and used it as an alignment layer in different liquid crystalline cells. A good quality of alignment was obtained for both nematic and chiral smectic C phases. Electro-optic response measurement were performed for ZLI 3774 mixture aligned on the semifluorinated polyacrilate to confirm high quality of the alignment.
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Multisoliton Behavior of a Ferrielectric Phase in an External Electric Field : Genetic Algorithm Study
Auteur(s): Lahoche L., Lorman V., Da Sylva J., Pavel J.
(Article) Publié:
Ferroelectrics, vol. 309 p.27 - 34 (2004)
DOI: 10.1080/00150190490509746
WoS: 000226091900004
Résumé: A numerical modeling of the three-layer SmC∗FIphase behavior under an external electric field is performed. A discrete free energy of the model is analyzed by means of genetic algorithms. We focus our attention on the structure evolution induced by the field and its relation to the field dependence of the in-plane optical anisotropy. We show the multisoliton character of the azimuthal molecular reorientation under the field. It permits us to explain the unusual field-induced behavior of the conoscopic figures in the SmC∗FIphase.
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Theory of Chiral Periodic Mesophases formed from an Achiral Liquid of Bent-core Molecules.
Auteur(s): Lorman V., Mettout B.
(Article) Publié:
Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 69 p.061710 (2004)
Ref HAL: hal-00338934_v1
PMID 15244601
DOI: 10.1103/PhysRevE.69.061710
WoS: 000222502700071
Exporter : BibTex | endNote
36 Citations
Résumé: The theory of unconventional one-dimensional periodic mesophases forming in a liquid of achiral bent-core molecules is presented. The order parameter is a polarization wave. Three distinct phases which can be stabilized directly from the isotropic liquid phase are associated with linear, circular, and elliptic polarizations of the wave. The elliptic polarization leads to the structure of the commonly studied B2 "bent-core" mesophase whereas the recently discovered Cp phase may be assigned to the linear polarization. We present the molecular configurations and macroscopic properties of the stable states. Their behavior under chiral doping and electric field application are investigated and the corresponding phase diagrams are calculated.
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