Université de Fribourg

Dehydroxylation kinetics of the serpentine group mine

Trittschack, Roy ; Grobéty, Bernard (Dir.)

Thèse de doctorat : Université de Fribourg, 2013 ; Nr. 1795.

Chemical reactions in general and solid-state reactions in particular are controlled by thermodynamics and kinetics. Whereas thermodynamic rules are used to state whether a phase is stable under a specific set of intensive and extensive parameters or not, kinetics applied to an underlain reaction of interest decipher the time-scale of such a reaction by offering the chance to determine associated...

Université de Fribourg

Characterization of chrysotile, tellurium and iImogolite nanotubes

Métraux, Cédric ; Grobéty, Bernard (Dir.) ; Jenny, Titus (Codir.)

Thèse de doctorat : Université de Fribourg, 2008.

The discovery of C60 (R. Smalley et al.) and carbon nanotubes CNTs (S. Iijima) in 1985 and 1991 respectively was a milestone in the field of nanoscience. Since 1991, WS2, MoS2, BN, Se, Te nanotubes were synthesized and analyzed. These nanotubes are promising materials for many applications in the field of catalysis, electronic, polymer synthesis, etc. In this study, we characterized the...

Université de Fribourg

Sources and characteristics of fine and ultrafine particles in ambient air

Lorenzo, Ronny ; Grobéty, Bernard (Dir.)

Thèse de doctorat : Université de Fribourg, 2007 ; Nr. 1556.

The topic of this PhD thesis covers a variety of aspects of aerosol science. Accordingly, the projects contributing to the accomplishments of this work are manifold and connected only by the enveloping topic of ambient aerosols. The goal of one of the studies was to identify and quantify particles emitted from railway traffic (chapter 2). For that purpose PM10 samples were collected near a busy...

Université de Fribourg

EBSD-based investigations of upper mantle xenoliths, snowball garnets and advanced ceramics

Vonlanthen, Pierre ; Grobéty, Bernard (Dir.)

Thèse de doctorat : Université de Fribourg, 2007 ; no 1555.

Since the beginning of the nineties, the automation of electron backscatter diffraction (EBSD) has completely revolutionized texture analysis carried out on rocks and man-made materials. Among the most striking advances, not only does EBSD allow a relatively rapid and straightforward bulk texture analysis, but it also allows the grain-by-grain determination of crystallographic orientations. The...

Université de Fribourg

Evolution of metal catalyst during CVD synthesis of carbon nanotubes

Matzinger, Kuno ; Grobéty, Bernard (Dir.) ; Strasser, Andreas (Codir.) ; Züttel, Andreas (Codir.) ; Vital, Andri (Codir.)

Thèse de doctorat : Université de Fribourg, 2006.

The revolutionary discovery of carbon nanotubes (CNT) in 1991 led to intense research activities in the domain of carbon science. The fascinating properties of these unique material has opened a great number of potential applications e.g. as electron field emitters, one-dimensional conductors, supercapacitors, reinforcing fibres or hydrogen storage. Despite these stunning technical progresses...