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See detailHet everzwijn en het geheimzinnige eiland
Gerkens, Jean-François ULg

Scientific conference (2009, March 19)

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See detailHow can cobalt complexes help synthetic polymer chemists?
Debuigne, Antoine ULg; Jérôme, Robert ULg; Jérôme, Christine ULg et al

Conference (2009, March 19)

Nowadays, progresses in medicine, biotechnology, microelectronic and many other fields are more and more sustained by the development of novel polymer materials with constantly improved properties and ... [more ▼]

Nowadays, progresses in medicine, biotechnology, microelectronic and many other fields are more and more sustained by the development of novel polymer materials with constantly improved properties and well-defined molecular parameters. In this context, we designed a controlled radical polymerization (CRP) technique based on cobalt complexes which is able to efficiently control the radical polymerization of challenging monomers such as vinyl acetate (VAc), N-vinyl pyrrolidone (NVP) and acrylonitrile (AN). This so-called Cobalt-Mediated Radical Polymerization (CMRP) also gave access to unique diblock copolymers by sequential polymerization of the above mentioned monomers. However, addition of isoprene to polymer chains preformed by CMRP did not lead to the expected poly(isoprene) containing copolymers. Instead, the quantitative coupling reaction of the polymer chains was observed, as assessed by the perfect doubling of the molar mass of the initial macromolecules. This result is very exciting because this so-called Isoprene-Assisted Radical Coupling (I-ARC) reaction is not limited to polymers with low molar masses and homopolymers, contrary to the existing radical chains coupling methods. Indeed, when applied to diblock copolymers, IARC constitutes a straightforward approach for the synthesis of telechelic symmetrical ABA triblock copolymers and is thus a very promising tool for macromolecular engineering. [less ▲]

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See detailThe influence of cobalt-coordination on cobalt-mediated radical polymerization of vinyl monomers
Debuigne, Antoine ULg; Piette, Yasmine ULg; Poli, Rinaldo et al

Poster (2009, March 19)

Nowadays, polymers are a part of everyday life. Researchers encouraged by growing need in high performance polymers develop new synthesis tools to manage the molecular architecture and thus the polymer ... [more ▼]

Nowadays, polymers are a part of everyday life. Researchers encouraged by growing need in high performance polymers develop new synthesis tools to manage the molecular architecture and thus the polymer properties. In this context, CRP (Controlled Radical Polymerization) techniques have been developed to obtain well-defined architectures and to control polymer parameters. Among these systems is Cobalt-Mediated Radical Polymerization (CMRP), which is based on the reversible deactivation of the growing radical chains with a cobalt complex, the cobalt (II) bis-acetylacetonate. The interest of this system is not only due to its ability to control the polymerization of very reactive monomers such as vinyl acetate (VAc) and N-vinylpyrrolidone (NVP), but also its peculiar mechanism which exhibits two pathways depending on the polymerization conditions; a reversible termination process and a degenerative chain transfer mechanism. Furthermore, it has been showed that the Co-C strength and thus the polymerization are strongly influenced by the use of some additives, such as water, dimethylformamide, dimethylsulfoxide and pyridine, which coordinate the cobalt free site. In this presentation we report the use of a preformed alkyl-cobalt(III) adduct as initiator for the polymerization of acrylonitrile (AN) and the use of these ligands in the CMRP system to synthesize well-defined poly(vinyl acetate)-b-poly(acrylonitrile) block copolymers. As a conclusion, cobalt-coordination appears today as a unique opportunity to adjust the Co-C bond strength and to push back the bounds of possibilities in terms of macromolecular engineering assisted by CMRP. [less ▲]

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See detailNew fluorinated surfactant for nanogels preparation
Alaimo, David ULg; Rieger, Jutta; Beigbeder, Alexandre et al

Conference (2009, March 19)

A series of novel fluorinated amphiphilic stabilizers of different architecture (diblock, grafted, or palm tree copolymers) were successfully prepared by reversible addition-fragmentation chain transfer ... [more ▼]

A series of novel fluorinated amphiphilic stabilizers of different architecture (diblock, grafted, or palm tree copolymers) were successfully prepared by reversible addition-fragmentation chain transfer and used as stabilizers for the dispersion polymerization of 2-hydroxyethyl methacrylate (HEMA) in fluorinated solvent, namely alpha,alpha,alpha-trifluorotoluene (TFT). The effect of the amount and the architecture of the copolymer on the size and the stabilization of the particles was studied. Whatever the experimental conditions, scanning electron microscopy showed the formation of submicronic (typically about 300 nm) spherical particles, with a narrow size distribution. The principal difference emerges from the concentration of surfactant. Indeed, at higher copolymer concentration, smaller and less aggregated particles were produced. These results were confirmed by dynamic light scattering but these measurements also revealed the presence of larger aggregates (1,5 micrometer). Furthermore, the surfactant properties of the copolymers were investigated by measuring the interfacial tension at the H2O/TFT interface, and the results were correlated to their stabilizing efficiency in the dispersion polymerization of HEMA. [less ▲]

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See detailModéliser l’ionosphère pour les utilisateurs Galileo simple fréquence
Bidaine, Benoît ULg

Learning material (2009)

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See detailSet-up of CGMS in Ethiopia and first user experiences
Djaby, Bakary ULg; Tychon, Bernard ULg; Massart, Michel

Conference (2009, March 18)

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See detailIntroduction: pourquoi est-il nécessaire d'étudier la médecine antique
Marganne, Marie-Hélène ULg

Scientific conference (2009, March 18)

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Peer Reviewed
See detailMolecular dynamics simulations of laser-induced damage of nanostructures and solids.
Diakhate, Momar ULg

in Applied Physics A : Materials Science & Processing (2009), 96

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See detailAdaptation du modèle PEGASE à deux substances sur deux sous-bassins situés dans les bassins hydrographiques des Agences Adour-Garonne et Rhin-Meuse
Deliège, Jean-François ULg; Everbecq, Etienne ULg; Grard, Aline ULg et al

Conference (2009, March 16)

L’INERIS (Institut National de l’Environnement Industriel et des Risques) France a élaboré pour le compte du Ministère français de l’Environnement les grandes lignes d’une méthodologie permettant de fixer ... [more ▼]

L’INERIS (Institut National de l’Environnement Industriel et des Risques) France a élaboré pour le compte du Ministère français de l’Environnement les grandes lignes d’une méthodologie permettant de fixer les Valeurs Limites à l’Emission (VLE) locales de manière à respecter les normes de qualité sur l’ensemble d’un bassin versant. Dans ce cadre, l’INERIS désire tester l’utilisation de modèles de transfert de polluants sur des bassins versant pilotes. L’objectif de cette étude est donc d’adapter le modèle PEGASE pour simuler deux micropolluants (à définir) sur deux bassins versants situé dans les bassins hydrographiques gérés par les agences de l’eau française Rhin-Meuse et Adour-Garonne. [less ▲]

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See detailL'image scientifique : de la visualisation à la mathématisation et retour
Dondero, Maria Giulia ULg

in Nouveaux Actes Sémiotiques (2009)

Cet article soumet à investigation les rôles des images dans la production en laboratoire et dans la littérature scientifique de l’astrophysique et de la physique théorique. D’un côté l’image en ... [more ▼]

Cet article soumet à investigation les rôles des images dans la production en laboratoire et dans la littérature scientifique de l’astrophysique et de la physique théorique. D’un côté l’image en astrophysique fonctionne en tant qu’instrument d’enregistrement des données permettant de caractériser un phénomène (régime autographique) : dans ce cas l’image transforme les traces d’un phénomène en un objet (nébuleuse, supernova, etc.), produit d’une négociation, qui sera ensuite accepté, stabilisé et institutionnalisé à l’intérieur de la discipline. De l’autre côté, l’image peut aussi devenir un instrument d’investigation, voire un terrain de travail visant la production d’autres iconographies et ainsi d’autres objets. Ce dernier fonctionnement de l’image relève du régime allographique (voir Nelson Goodman, Les langages de l’art. Pour une théorie des symboles, 1968) : dans ce cas l’image se présente comme un texte d’instructions pour la production d’autres images : elle devient un texte générateur et permet une mathématisation des données. En prenant ensuite en considération les recherches en physique théorique sur les trous noirs, notre article étudie la relation entre équations et visualisation. On étudie plus précisément la première iconographie des trous noirs proposée par l’astrophysicien Jean-Pierre Luminet en 1979. Les travaux de Luminet qu’on analyse dans notre article montrent l’effort de construction d’une iconographie d’un objet théorique ni visible ni photographiable tel les trous noirs, et la nécessité de visualiser les résultats des équations pour faire avancer les hypothèses et la connaissance de ces phénomènes. Enfin, l’image en physique théorique, produite par des équations, montre le pouvoir que la visualisation a de mettre en scène un objet pluriel, voire un certain type de trous noirs, et de devenir ainsi une image modèle mais toujours ultérieurement manipulable (diagramme). [less ▲]

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See detailModélisation physique à grande échelle d'un élément PKW
Machiels, Olivier ULg

Conference (2009, March 12)

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Peer Reviewed
See detailQuantum dynamical study of the amplitude collapse and revival of coherent A1g phonons in bismuth: a classical phenomenon?
Diakhate, Momar ULg

in Applied Physics A : Materials Science & Processing (2009), 96

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See detailPreliminary design of twin-cylinder engines for hybrid electric vehicle applications
Louvigny, Yannick ULg; Christiaens, Sébastien; Duysinx, Pierre ULg

Conference (2009, March 10)

Most of HEV are built using existing engines. These engines have been developed for conventional car and are not especially tailored for HEV. The objectives of this work are to establish general ... [more ▼]

Most of HEV are built using existing engines. These engines have been developed for conventional car and are not especially tailored for HEV. The objectives of this work are to establish general requirements placed on an ICE for a HEV application, to draw the main characteristics of the engine and to find the best configuration of twin-cylinder ICE to motorize an HEV. The twin-cylinder engine offer interesting perspectives in the field of HEV thanks to its small size, low weight and low cost. [less ▲]

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See detailSupercritical CO2 as an efficient medium for layered silicate organomodification: preparation of thermally stable organoclays and dispersion in polyamide 6
Naveau, Elodie ULg; Calberg, Cédric ULg; Detrembleur, Christophe ULg et al

in Polymer (2009), 50(6), 1438-1446

In this study, the preparation of organoclays via a new process using supercritical carbon dioxide is described. This method turns out to be very efficient with various surfactants, in particular nonwater ... [more ▼]

In this study, the preparation of organoclays via a new process using supercritical carbon dioxide is described. This method turns out to be very efficient with various surfactants, in particular nonwater-soluble alkylphosphonium salts. The influence of the surfactant as well as of the clay nature on the thermal stability of the organoclay is evaluated by thermogravimetric analysis. Phosphonium-based montmorillonites are up to 90 °C more stable than ammonium-based montmorillonites. Moreover, the use of hectorite adds another 40 °C of thermal stability to the phosphonium-modified clays. These organomodified clays have been melt-blended with polyamide 6 and morphology as well as fire properties of the nanocomposites are discussed, in terms of influence of the stability of organoclays. For the first time, comparison of nanocomposites based on clay organomodified by ammonium and phosphonium salts of the very same structure is reported. [less ▲]

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See detailNot Just Sound II: an investigation of singer patient self-perceptions mapped into the voice range profile.
Lamarche, Anick; Morsomme, Dominique ULg; Ternström, Sten

in Doctoral Thesis: Putting the singing voice on the map (2009), 1

In aiming at higher specificity in clinical evaluations of the singing voice, singer perceptions were included and tested in conjunction with the voice range profile. Method: The use of a commercial ... [more ▼]

In aiming at higher specificity in clinical evaluations of the singing voice, singer perceptions were included and tested in conjunction with the voice range profile. Method: The use of a commercial phonetograph supplemented by a hand-held response button was clinically tested with 13 subjects presenting voice complaints. Singer patients were asked to press a button to indicate sensations of vocal discomfort or instability during phonation. Each press was registered at the actual position in the Voice Range Profile (VRP) so as to mark areas of difficulty. Consistency of button press behavior was assessed with a method developed previously. Results: In spite of their voice complaints, subjects did not press the button as much as healthy singers. Like healthy singers, the singer-patient group demonstrated consistent behavior but tended to press the button in completely different areas of the VRP space. The location of the presses was dominantly in the interior of the VRP and concentrated to a small fundamental frequency range. An extensive discussion examines carefully the reasons for such outcomes. Conclusion: The button augmented VRP could be a well needed resource for clinicians but requires further development and work. [less ▲]

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See detailResponse to eccentric exercise : High and Low responders ?
Hody, Stéphanie ULg

Conference (2009, March 05)

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See detailRosuvastatin in Patients with Elevated C-Reactive Protein
Pierard, Luc ULg

in New England Journal of Medicine [=NEJM] (2009), 360(10), 1040

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See detailÉducation & Sport : «Ne se trompe-t-on pas de combat?»
Cloes, Marc ULg

Conference given outside the academic context (2009)

La place du sport à l'école fait l'objet de nombreuses discussions et réflexions. Surtout à l'approche de grands rendez-vous électoraux ou à l'issue d'événements sportifs planétaires tels que les Jeux ... [more ▼]

La place du sport à l'école fait l'objet de nombreuses discussions et réflexions. Surtout à l'approche de grands rendez-vous électoraux ou à l'issue d'événements sportifs planétaires tels que les Jeux Olympiques. D'aucuns considèrent que le sport devrait être plus largement soutenu et intégré à la formation scolaire. Dans cet exposé, nous attirerons l'attention des participants sur la nécessité de s'intéresser encore davantage à un concept qui dépasse le sport et est ancré dans le développement d'une société plus saine: l'activité physique. [less ▲]

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