Sonochemistry: Scope, Limitations… and Artifacts

Heterogeneous sonochemistry, generally described as the most useful aspect of sonochemistry, suffers from the difficulty of defining the experimental conditions for the reference (silent) reaction. Clearly the use of an efficient agitation system for the silent reaction strongly reduces the value of the so-called sonochemical effect, which becomes in some cases, less than 1 (anti-sonochemical effect!).The 'cleaning' effect of ultrasound is extremely efficient to expel micro-crystals from the surface of an electrode which is simultaneously an immersion ultrasonic horn. By sending out-of-phase electric pulses and acoustic pulses, new nano materials (metals, alloys, semiconductors, oxides) are easily prepared in high purity

Physique des matériaux

Syllabus strictement réservé aux étudiants suivant le cours de Physique des matériaux, Faculté des Sciences appliquées. META 233info:eu-repo/semantics/published

Contribution à l'étude de l'anodisation du titane

Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe

Physique des matériaux

SYL-001371 = Texte ;SYL-001372 = Figures1re édition 1995-1996/1Syllabus strictement réservé aux étudiants de 3e année toutes sections sciences appliquéesinfo:eu-repo/semantics/published

Le titane cet inconnu

info:eu-repo/semantics/publishe

Copper Solvent Extraction by Ultrasound-Assisted Emulsification

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Structure of galvanostatic anodic TiO2 films: comparison of microscopies

The galvanostatic anodization of titanium substrates at high current density (higher than 50 A/m2 at room temperature) tends to the formation of a thin oxide film with preferential conducting channels inside a homogeneous non conducting matrix. The purpose of this paper is to compare the results obtained by different microscopies (optical microscopy, scanning electron microscopy, scanning transmission electron microscopy at high resolution with electron diffraction and atomic force microscopy) in order to identify the structure and the composition of these channels. These channels are formed by the contact of a small number (10 to 20) of submicronic (100 to 500 nm) crystals. All these crystals present the same crystallographic orientation perpendicular to the substrate. The aggregates are protruding from the relatively flat oxide surface. The different microscopies provide complementary results.info:eu-repo/semantics/publishedInternational Symposium on Passivity, & Heusler, K. E. (1995). Passivation of metals and semiconductors: Proceedings of the Seventh International Symposium on Passivity, Passivation of Metals and Semiconductors, Technical University of Clausthal, Germany, August 21-26, 1994. Aedermannsdorf, Switzerland: Trans Tech Publications