Témoignage sur le parcours de Lucie, raconté par ses parents

Dupré, Bernard; Dupré, Marie

doi:10.3917/empa.104.0083

Empan

2016

DOI: 10.3917/empa.104.0083

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Témoignage sur le parcours de Lucie, raconté par ses parents

Bernard Dupré¹,

Marie Dupré²

Abstract: Le témoignage que nous proposons est l’occasion de faire un bref survol de ce qui nous a marqués, touchés, interrogés tout au long des expériences multiples de Lucie, notre enfant : milieu ordinaire et spécialisé ( clis ), institutions ( ime , foyer de vie), hôpital de jour. Expression qui permet de rendre perceptibles les attentes et le vécu quotidien de parents confrontés au handicap d’un enfant qu’ils confient à des établissements.

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“…Determination of SF by the droplet angle. In systems with droplet formation, the Young-Dupré equation[30][31][32] is used to determine the interfacial energy SF. Since SF is associated besides S and F with the contact wetting angle , the angle between substrate and drop surface has to be determined:…”

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Analysis of catalyst surface wetting: the early stage of epitaxial germanium nanowire growth

Ernst¹,

Lange²,

Uebel³

et al. 2020

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In several nanotechnological applications the dewetting process is crucial. Although not all phenomena of dewetting are fully understood yet, especially with regard to metallic fluids, it is clear that the formation of nanoparticles, -droplets, and -clusters and their movement is strongly linked to their wetting behaviour. For this reason, the thermodynamic stability of thin metal layers (0.1 – 100 nm) with respect to its free energy is examined here. The decisive factor for the theoretical consideration is the interfacial energy. In order to achieve a better understanding of the interface interactions, three different models for the estimation of this energy are presented: i. fully theoretical, ii. empirical and iii. semi-empirical. The formation of nanometre-sized gold particles on silicon and silicon oxide is investigated in detail, elucidating the strengths and weaknesses of the three models, comparing the different substrates, and verifying the possibility of further processing of the gained particles as nanocatalysts. The importance of a persistent thin communication wetting layer between the particles and its effects on their size and number also becomes clear. In particular, the intrinsic reduction of the Laplace pressure of the system by material re-evaporation and Ostwald ripening is considered to describe the theoretically predicted and experimentally found effects. Thus dewetting phenomena of thin metal layers can be well-directed used for the manufacturing of nanostructured devices. From this viewpoint, the behaviour of gold droplets as catalysts to grow germanium nanowires on different substrates is described.

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mentioning

confidence: 99%

Analysis of catalyst surface wetting: the early stage of epitaxial germanium nanowire growth

Ernst¹,

Lange²,

Uebel³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

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Témoignage sur le parcours de Lucie, raconté par ses parents

Cited by 1 publication

References 0 publications

Analysis of catalyst surface wetting: the early stage of epitaxial germanium nanowire growth

Analysis of catalyst surface wetting: the early stage of epitaxial germanium nanowire growth

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