Université de Fribourg

Mimicking the chemistry of natural eumelanin synthesis: the ke sequence in polypeptides and in proteins allows for a specific control of nanosized functional polydopamine formation

Bergtold, Camille ; Hauser, Daniel ; Alain Chaumont ; El Yakhlifi, Salima ; Mateescu, Mihaela ; Meyer, Florent ; Metz-Boutigue, Marie-Hélène ; Benoît Frisch ; Schaaf, Pierre ; Ihiawakrim, Dris ; Ersen, Ovidiu ; Monnier, Christophe A. ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara ; Ball, Vincent

In: Biomacromolecules, 2018, vol. 19, no. 9, p. 3693–3704

The oxidation of dopamine and of other catecholamines leads to the formation of conformal films on the surface of all known materials and to the formation of a precipitate in solution. In some cases, it has been shown that the addition of additives in the dopamine solution, like certain surfactants or polymers, polyelectrolytes, and certain proteins, allows to get polydopamine nanoparticles...

Consortium of Swiss Academic Libraries

Electronic structure and optical properties of TaC from the first principles calculation

Sahnoun, M. ; Daul, C. ; Parlebas, J. C. ; Demangeat, C. ; Driz, M.

In: The European Physical Journal B - Condensed Matter and Complex Systems, 2005, vol. 44, no. 3, p. 281-286

Université de Fribourg

Influence of linear and branched perfluoroalkylated side chains on the π–π stacking behaviour of hexa-peri-hexabenzocoronene and thermotropic properties

Alameddine, Bassam ; Aebischer, Olivier Frédéric ; Heinrich, Benoît ; Guillon, Daniel ; Donnio, Bertrand ; Jenny, Titus A.

In: Supramolecular Chemistry, 2014, vol. 26, no. 2, p. 125–137

The thermotropic properties and self-assembly of two different series of hexa-peri-hexabenzocoronenes (HBC) bearing either linear or branched perfluoroalkylated side chains, each with a wide range of alkyl spacer and perfluorinated tail lengths, have been studied. Correlations between thermogravimetric analysis, differential scanning calorimetry, polarised optical microscopy and small-angle X-ray...

Université de Fribourg

New polycondensed aromatic compoundsfor applications in the hydrogen cycle

Fragnière, Nicolas ; Jenny, Titus (Dir.)

Thèse de doctorat : Université de Fribourg, 2011.

Dans ce travail, nous allons présenter la synthèse d’un nouvel HBC perfluoroalkylé muni d’un acide sulfonique à la fin de l’une des chaînes perfluoroalkylé. Le but de l’introduction de cet acide est sa capacité à former de canaux à protons utilisable comme membrane dans des piles à combustible. Les canaux seraient créés par la formation de «stacks» de clusters de trois HBCs...

Université de Fribourg

Synthesis of Hexa-peri-hexobenzocoronenes Carrying Linear or Branched Perfluoroalkylated Side Chains

Aebischer, Olivier F. ; Muñoz, David T. ; Tondo, Patrick ; Débieux, Jean-Luc ; Jenny, Titus A.

In: Synthesis, 2010, vol. 7, p. 1123-1140

Substituted disc-shaped perfluoroalkylated hexa-peri-hexabenzocoronenes (HBC), known to self-assemble into conducting ordered architectures, were synthesized and characterized. A systematic variation of the linear or branched perfluoroalkylated side chains was performed in order to screen the influence of the lateral chain on their one-dimensional self-aggregation.

Université de Fribourg

Controlling the supramolecular assembly of perfluorinated polycondensed aromatic hydrocarbons by side chain engineering

Aebischer, Olivier F. ; Jenny, Titus (Dir.) ; Weiss, Antoine (Codir.)

Thèse de doctorat : Université de Fribourg, 2007 ; Nr. 1575.

The possibilities of industry to process and to engineer materials at the nanometer level rapidly increase and products using materials engineered at the nanometer level emerge on the markets. In the long term, it is hardly possible to estimate, from the present point, where the ability to engineer materials on the nano-scale will lead human beings, whether the dream of a molecular nanotechnology...

Université de Fribourg

Synthesis and investigation of new large self-assembled supramolecules as potential electron emitters

Alameddine, Bassam ; Jenny, Titus (Dir.)

Thèse de doctorat : Université de Fribourg, 2004 ; no 1440.

La nanotechnologie, domaine de recherche qui couvre plusieurs branches scientifiques en Médecine, Biologie, Physique et Chimie, est en pleine expansion dans les institutions de recherche et suscite un vif intérêt dans l’industrie vu ses prometteuses applications. Ceci est dû à plusieurs raisons, parmi lesquelles, on note le control à une échelle moléculaire ce qui augmente...

Université de Fribourg

Controlling the lateral aggregation of perfluoroalkylated hexa-peri-hexabenzocoronenes

Aebischer, Olivier F. ; Aebischer, Annina ; Donnio, Bertrand ; Alameddine, Bassam ; Dadras, Massoud ; Güdel, Hans-Ulrich ; Guillon, Daniel ; Jenny, Titus A.

In: Journal of Materials Chemistry, 2007, vol. 17, no. 13, p. 1262-1267

The investigation of two hexa-peri-hexabenzocoronene (HBC) derivatives carrying linear or branched perfluoroalkylated side chains is reported. Polycondensed aromatic hydrocarbons (PAH) such as HBC derivatives are well known to self-organize to form highly ordered monomolecular stacks, which in turn show a concentration- and solvent-dependent lateral aggregation. However, possible...

Université de Fribourg

Synthesis of perfluoroalkylated bulky triarylamines

Alameddine, Bassam ; Savary, Corinne ; Aebischer, Olivier ; Jenny, Titus A.

In: Synthesis, 2007, p. 271-276

The synthesis of two new triarylamine compounds bearing perfluoroalkylated side chains is described. Good thermal stabilities combined with a blue emission make these compounds promising candidates for materials applications.