| 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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Dias, Carlos
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2023Study of the mesomorphic properties and conductivity of n-alkyl-2-picolinium ionic liquid crystalscitations
- 2019Tailoring IGZO composition for enhanced fully solution-based thin film transistorscitations
- 2016Accessing the Physical State and Molecular Mobility of Naproxen Confined to Nanoporous Silica Matrixescitations
- 2013New method to analyze dielectric relaxation processescitations
- 2013Enhancing the Response of Chemocapacitors with Electrospun Nanofiber Filmscitations
- 2012Sintering,Crystallization and Dielectric Behavior of Barium Zinc Borosilicate Glasses - Effect of Barium Oxide substitution for Zinc Oxidecitations
- 2012Understanding the Ion Jelly Conductivity Mechanismcitations
- 2010Charge Carriers Injection/Extraction at the Metal-Polymer Interface and Its Influence in the Capacitive Microelectromechanical Systems-Switches Actuation Voltage
- 2006Development of an ultrasonic motor based on a piezoelectric ceramic sandwiched between two laminate composite plates
- 2006Changes in molecular dynamics upon formation of a polymer dispersed liquid crystalcitations
- 2005Ultrasound role in sol-gel processing of PbTiO3 ceramics
- 2004Capacitance response of polysiloxane films with interdigital electrodes to volatile organic compoundscitations
- 2004Analytical evaluation of the interdigital electrodes capacitance for a multi-layered structurecitations
- 2004Recent Advances in Ceramic-polymer Composite Electretscitations
- 2002Smart materials: the functional properties of ceramic/polymer composites and their relation to sol-gel powder preparationcitations
- 2002Dielectric characterization of PEBA and PDMS for capacitive interdigital vapour sensorscitations
Places of action
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article
Changes in molecular dynamics upon formation of a polymer dispersed liquid crystal
Abstract
The molecular dynamics during the formation of a polymer dispersed liquid crystal (PDLC) was followed by dielectric relaxation spectroscopy in the frequency range from 10(-1) to 2x10(6) Hz and over the temperature range from 158 to 273 K. The composite was produced by thermal polymerization induced phase separation of a mixture of triethyleneglycol dimethacrylate and the nematic liquid crystal, E7, in the proportion of 60:40 w/w. Both monomer and liquid crystal vitrify upon cooling having glass transition relaxation processes already characterized by some of us; yet E7 was previously studied in a narrower frequency range, so the present work updates its dielectric behavior. The starting mixture exhibits a rather complex dielectric spectrum due to the detection of multiple processes occurring simultaneously in the monomer and liquid crystal constituents. The PDLC formation occurs by mobility changes essentially in the liquid crystal tumbling motion, while the main relaxation of the monomer depletes upon polymerization. A low intense secondary process of E7 hardly detected in the bulk material is enhanced in both starting mixture and final composite allowing its characterization.