| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Boudet, Nathalie
Processes and Engineering in Mechanics and Materials
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (24/24 displayed)
- 2023Influence of the Ge content on the lithiation process of crystalline Si 1− x Ge x nanoparticle-based anodes for Li-ion batteriescitations
- 2022Relationship between atomic structure and excellent glass forming ability in Pd 42.5 Ni 7.5 Cu 30 P 20 metallic glasscitations
- 2022Coupling between elastic strains and phase transition in dense pure zirconia polycrystalscitations
- 2022Relationship between atomic structure and excellent glass forming ability in Pd42.5Ni7.5Cu30P20 metallic glasscitations
- 2021Detailed structural analysis of amorphous Pd40Cu40P20: Comparison with the metallic glass Pd40Ni40P20 from the viewpoint of glass forming abilitycitations
- 2021Detailed structural analysis of amorphous Pd 40 Cu 40 P 20 :Comparison with the metallic glass Pd 40 Ni 40 P 20 from the viewpoint of glass forming abilitycitations
- 2020Prelithiation of silicon/graphite composite anodes: Benefits and mechanisms for long-lasting Li-Ion batteriescitations
- 2019Advanced Non-Destructive in Situ Characterization of Metals with the French Collaborating Research Group D2AM/BM02 Beamline at the European Synchrotron Radiation Facilitycitations
- 2019Advanced Non-Destructive in Situ Characterization of Metals with the French Collaborating Research Group D2AM/BM02 Beamline at the European Synchrotron Radiation Facilitycitations
- 2019Heterogeneous Nanostructural Aging of Fuel Cell Ionomer Revealed by Operando SAXScitations
- 2019Partial structure investigation of the traditional bulk metallic glass Pd40Ni40P20citations
- 2019Partial structure investigation of the traditional bulk metallic glass Pd40Ni40 P20citations
- 2018In situ Synchrotron X-Ray diffraction study of high-temperature stress relaxation in chromia scales containing the reactive element yttriumcitations
- 2017Strains in thermally growing Cr2O3 films measured in situ using synchrotron X-rayscitations
- 2016Tuning the conductivity type in a room temperature magnetic oxide: Ni-doped Ga0.6Fe1.4O3 thin filmscitations
- 2016Reaction of Ni film with In0.53Ga0.47As: Phase formation and texturecitations
- 2016Determination of the cationic distribution in oxidic thin films by resonant X-ray diffraction: the magnetoelectric compound Ga2-xFexO3. Supporting information
- 2016Self-organized arrays of dislocations in thin smectic liquid crystal filmscitations
- 2016Self-organized arrays of dislocations in thin smectic liquid crystal filmscitations
- 2014Probing Self-Assembly of Cylindrical Morphology Block Copolymer Using in Situ and ex Situ Grazing Incidence Small-Angle X-ray Scattering: The Attractive Case of Graphoepitaxycitations
- 2012Key experimental information on intermediate-range atomic structures in amorphous Ge2Sb2Te5 phase change materialcitations
- 2012Anomalous x-ray diffraction measurements of long-range order in (001)-textured L1(0) FePtCu thin filmscitations
- 2011Microstructural mapping of C60 phase transformation into disordered graphite at high pressure, using X-ray diffraction microtomographycitations
- 2007Development of structural order during supercooling of a fragile oxide meltcitations
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article
Self-organized arrays of dislocations in thin smectic liquid crystal films
Abstract
Combining optical microscopy, synchrotron X-ray diffraction and ellipsometry, we studied the internal structure of linear defect domains (oily streaks) in films of smectic liquid crystal 8CB with thickness 100-300 nm confined between air and a rubbed PVA polymer substrate which impose hybrid anchoring conditions (normal and unidirectional planar, respectively). We show how the presence or absence of dislocations control the structure of highly deformed thin smectic films. Each domain contains smectic layers curved in the shape of flattened hemicylinders to satisfy both anchoring conditions, together with grain boundaries whose size and shape are controlled by the presence of dislocation lines. A flat grain boundary normal to the interface connects neighboring hemicylinders, while a rotating grain boundary (RGB) is located near the axis of curvature of the cylinders. The RGB shape appears such that dislocation lines are concentrated at its summit close to the air interface. The smectic layers reach the polymer substrate via a transition region where the smectic layer orientation satisfies the planar anchoring condition over the entire polymer substrate and whose thickness does not depend on the one of the film. The strength of the planar anchoring appears to be high, larger than 10 −2 J/m 2 , compensating for the high energy cost of creating an additional 2D defect between an horizontal smectic layer and perpendicular ones. This 2D defect may be melted, in order to avoid the creation of a transition region structure composed of a large number of dislocations. As a result, linear defect domains can be considered as arrays of oriented defects, straight dislocations of various Burger vectors, whose location is now known and 2D nematic defects. The possibility of easy variation between the present structure with a moderate amount of dislocations and a structure with a large number of dislocations is also demonstrated.