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Université de Fribourg

Synthesis and applications of nanocontainers and nanorattles

Abram, Sarah-Luise ; Yep, Philippe ; Fromm, Katharina M.

In: CHIMIA International Journal for Chemistry, 2019, vol. 73, no. 1, p. 12–16

Nanorattles and hollow nanocontainers have unique properties related to the presence of a void space inside the shell, which has been shown to improve the properties of materials for e.g. catalysis, drug release, sensor materials or lithium ion batteries. This article summarizes our recent progress in the synthesis of hollow silica, titania and ceria nanorattles and nanocontainers, eventually...

Université de Fribourg

Handling (nano)silver as antimicrobial agent: therapeutic window, dissolution dynamics, detection methods and molecular interactions

Abram, Sarah‐Luise ; Fromm, Katharina M.

In: Chemistry – A European Journal, 2020, vol. 26, no. 48, p. 10948–10971

Silver is an antimicrobial agent well known since antiquity. With the emergence of multiresistant bacteria, it has come back into the focus of research, and ionic as well as nano‐sized silver have been studied in vitro and in vivo. The results are controversial, silver being discussed as the “silver bullet” or a “wolf in sheep's clothing”. A thorough search of literature from...

Université de Fribourg

Ag Nanoencapsulation for Antimicrobial Applications

Abram, Sarah-Luise ; Gagnon, Jacinthe ; Priebe, Magdalena ; Hérault, Nelly ; Fromm, Katharina M.

In: CHIMIA International Journal for Chemistry, 2018, vol. 72, no. 4, p. 249–252

Biomaterial-related infections remain a significant challenge in medicine. Antimicrobial materials on the basis of Ag nanoparticles represent a promising solution for this issue. Therefore several Ag-containing nanocontainers and nanorattles have been synthesized and characterized that exhibit remarkable control over the release of Ag+ as antimicrobial active species. Their biological...

Université de Fribourg

Synthesis of Novel Fluorinated Hexa-peri-hexabenzocoronenes

Aebischer, Olivier F. ; Tondo, Patrick ; Alameddine, Bassam ; Jenny, Titus A.

In: Synthesis, 2006, vol. 17, p. 2891–2896

The synthesis of several perfluoroalkylated hexabenzocoronene derivatives is described. The substituents range from linear semiperfluoroalkylated chains to branched perfluoroalkylated chains. Novel strategies were applied to overcome the low solubility and the low reactivity of such chains.

Université de Fribourg

Self-aggregated perfluoroalkylated hexa-peri-hexabenzocoronene fibers observed by cryo-SEM and fluorescence spectroscopy

Aebischer, Olivier F. ; Aebischer, Annina ; Tondo, Patrick ; Alameddine, Bassam ; Dadras, Massoud ; Güdel, Hans-Ulrich ; Jenny, Titus A.

In: Chemical Communications, 2006, p. 4221 - 4223

The self-assembled architectures in solution of a new HBC derivative bearing perfluoroalkylated side chains were investigated by optical excitation and emission spectroscopy and correlated to cryo-SEM, a new technique in organic chemistry.

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.

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

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.

Nanotechnologie ist ein Begriff, dessen Bedeutung ständig wächst, da die Industrie täglich mehr Materialien auf den Markt bringt, welche im Prozess der Miniaturisierung bis in den Nanometerbereich entwickelt wurden. Vom heutigen Standpunkt aus ist es längst nicht mehr klar, wohin uns die Nanotechnologie noch führen wird. Kann der Traum von molekularen Maschinen, die mit „atomarer“...

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 Neuchâtel

Photophysics and photochemistry of 4-Dihydropyridinones

Aeby D. ; Eichenberger, Eugen ; Haselbach, E. ; Suppan, P. ; Guerry, Philippe ; Neier, Reinhard

In: Photochemistry & Photobiology, 1990, vol. 52, no. 2, p. 283-292

Dihydropyridinones (DHP) react photochemically with olefins to form cycloaddition products. The reactions proceed through the lowest excited state T, of the DHPs, with rate constants which depend on the olefin and can approach the diffusional limit in the most favourable cases. Intra- and inter-molecular sensitization and quenching have been investigated, as well as spectroscopic properties such...

Consortium of Swiss Academic Libraries

Iodide interaction with natural pyrite

Aimoz, Laure ; Curti, Enzo ; Mäder, Urs

In: Journal of Radioanalytical and Nuclear Chemistry, 2011, vol. 288, no. 2, p. 517-524