| 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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Godinho, Mh
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Topics
Publications (13/13 displayed)
- 2023Study of the mesomorphic properties and conductivity of n-alkyl-2-picolinium ionic liquid crystalscitations
- 2022Synthesis and characterisation of ionic liquid crystals based on substituted pyridinium cationscitations
- 2017Hybrid polysaccharide-based systems for biomedical applicationscitations
- 2015Functional materials from liquid crystalline cellulose derivatives: Synthetic routes, characterization and applicationscitations
- 2014Cellulose‐Based Liquid Crystalline Composite Systemscitations
- 2014Nanocrystalline cellulose applied simultaneously as the gate dielectric and the substrate in flexible field effect transistorscitations
- 2013Cellulose Perversionscitations
- 2011All-Cellulosic Based Composites
- 2010Shear-induced lamellar ionic liquid-crystal foamcitations
- 2009Deformation of isotropic and anisotropic liquid droplets dispersed in a cellulose liquid crystalline derivativecitations
- 2002Anisotropic hydroxypropylcellulose films as alignment layers of a bistable ferroelectric devicecitations
- 2002Dielectric studies of the nematic mixture E7 on a hdroxypropylcellulose substratecitations
- 2001Cellulose-based composite filmscitations
Places of action
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article
Shear-induced lamellar ionic liquid-crystal foam
Abstract
In a recent paper we reported an experimental study of two N-alkylimidazolium salts. These ionic compounds exhibit liquid crystalline behaviour with melting points above 50 degrees C in bulk. However, if they are sheared, a (possibly non-equilibrium) lamellar phase forms at room temperature. Upon shearing a thin film of the material between microscope slides, textures were observed that are strikingly similar to liquid (wet) foams. The images obtained from polarising optical microscopy (POM) were found to share many of the known quantitative properties of a two-dimensional foam coarsening process. Here we report an experimental study of this foam using a shearing system coupled with POM. The structure and evolution of the foam are investigated through the image analysis of time sequences of micrographs obtained for well-controlled sets of physical parameters (sample thickness, shear rate and temperature). In particular, we find that there is a threshold shear rate below which no foam can form. Above this threshold, a steady-state foam pattern is obtained where the mean cell area generally decreases with increasing shear rate. Furthermore, the steady-state internal cell angles and distribution of the cell number of sides deviate from their equilibrium (i.e. zero-shear) values.