Hervé Elettro

Hervé Elettro
École Polytechnique Fédérale de Lausanne | EPFL · Institute of Mechanical Engineering

PhD

About

14
Publications
2,811
Reads
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160
Citations
Additional affiliations
January 2018 - present
École Polytechnique Fédérale de Lausanne
Position
  • PostDoc Position
November 2015 - November 2017
University of Santiago, Chile
Position
  • PostDoc Position
September 2012 - September 2015
Sorbonne Université
Position
  • Research Assistant
Description
  • Teaching assistant for 1st and 2nd year students, for classes and lab work, in solid and fluid mechanics and thermodynamics
Education
September 2008 - September 2011
September 2005 - September 2008
Lycée Berthollet
Field of study
  • Physics and Chemistry

Publications

Publications (14)
Article
Full-text available
We demonstrate the impressive adhesive qualities of uloborid spider orb-web capture when dry, which are lost when the nano-filament threads are wetted. A force sensor with a 50 nN-1 mN detection sensitively allowed us to measure quantitatively the stress-strain characteristics of native silk threads in both the original dry state and after wetting...
Article
Full-text available
Cette thèse a visé à comprendre et à recréer artificiellement un mécanisme d'auto-assemblage présent dans la soie d'araignée. Les gouttes de glue microniques qui existent sur la soie d'araignée dîte de capture servent à fournir à la toile ses propriétés adhésives. Ces gouttes jouent pourtant un autre rôle : elles améliorent grandement les propriété...
Article
Full-text available
An essential element in the web-trap architecture, the capture silk spun by ecribellate orb spiders consists of glue droplets sitting astride a silk filament. Mechanically this thread presents a mixed solid-liquid behavior unknown to date. Under extension, capture silk behaves as a particularly stretchy solid, owing to its molecular nanosprings, bu...
Article
Full-text available
This work reports an innovative humidity driven actuation concept based on conversion of chemical energy of adsorption/desorption using simple nanoporous sol-gel silica thin films as humidity responsive materials. Bilayer shaped actuators, consisting of a humidity-sensitive active nanostructured silica film deposited on a polymeric substrate (Kapto...
Chapter
Full-text available
Graphene and other low-dimensional materials are a fantastic playground both for fundamental and applied sciences: for the former, to reach beyond the laws of continuum mechanics and expand the realm of bulk materials and, for the latter, to unlock new potential breakthroughs in areas ranging from single-molecule sensors to hydrogen storage and wat...
Article
Full-text available
Graphene is considered an enabling material for next generation sensors, due to the remarkable properties derived from its atomic thickness. However, these promises come with acute sensitivity to parasite adsorbates, that may hinder reaching the full potential of commercial devices. Herein we report a detailed study of the dramatic effect of adsorb...
Article
Full-text available
Confined two-dimensional assemblies of floating particles, known as granular rafts, are prone to develop a highly nonlinear response under compression. Here we investigate the transition to the friction-dominated jammed state and map the gradual development of the internal stress profile with flexible pressure sensors distributed along the raft sur...
Article
Full-text available
A liquid drop sitting on an elastic rod may act as a winch, or windlass, and pull the rod inside itself and coil it. This windlass effect has been shown to be generated by surface tension forces and to work best for small systems. Here we study the case where the drop is large enough so that its weight interferes with surface tension and modifies t...
Preprint
Full-text available
We demonstrate the impressive adhesive qualities of Uloborid spider orbweb capture when dry, which are lost when the nano-filament threads are wetted. A force sensor with a 50 nN–1mN detection sensitively allowed us to measure quantitatively the stress–strain characteristics of native silk threads in both the original dry state and after wetting by...
Article
Full-text available
We investigate the mechanics of elastic fibres carrying liquid droplets. In such systems, buckling may localize inside the drop cavity if the fibre is thin enough. This so-called drop-on-coilable-fibre system exhibits a surprising liquid-like response under compression, and a solid-like response under tension. Here we analyze this unconventional be...
Article
Full-text available
Capillary forces acting at the surface of a liquid drop can be strong enough to deform small objects and recent studies have provided several examples of elastic instabilities induced by surface tension. We present such an example where a liquid drop sits on a straight fiber, and we show that the liquid attracts the fiber which thereby coils inside...
Article
Full-text available
Motivated by recent experimental observations of capillary-induced spooling of fibers inside droplets both in spider capture silk and in synthetic systems, we investigate the behavior of a fiber packed in a drop. Using a simplified 2D model, we provide analytical predictions for the buckling threshold and the deep post-buckling asymptotic behavior....
Article
Spiders' webs and gossamer threads are often paraded as paradigms for lightweight structures and outstanding polymers. Probably the most intriguing of all spider silks is the araneid capture thread, covered with tiny glycoprotein glue droplets. Even if compressed, this thread remains surprisingly taut, a property shared with pure liquid films, allo...

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Projects

Projects (4)
Project
Implementation of deployable structures in microfluidic devices
Archived project
Inspired by spider capture silk, we observe for the first time in-drop buckling localization in newly coined drop-on-coilable-fibre systems. We derive a universal protocol to produce liquid-solid hybrid materials with simple thin microfibres and liquid droplets.
Project
We investigate the pressure field in a capillary raft and the localization of wrinkles and folds, in relation with the Janssen effect