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Fabric evolution and the related swelling behaviour of a sand/bentonite mixture upon hydro-chemo-mechanical loadings

Lyesse Laloui, Alessio Ferrari, Donatella Manca

This experimental study investigates the swelling behaviour of an 80/20 sand/bentonite mixture and the associated fabric evolution under different hydro-chemo-mechanical loadings. Free and confined swelling tests are performed on specimens compacted to dif ...

Ice Publishing2016

Hydro-chemo-mechanical characterisation of sand/bentonite mixtures : with a focus on the water and gas transport properties

Donatella Manca

According to Swiss regulations, low and intermediate level wastes (L/ILW) should be stored in deep geological repositories excavated about 300 to 400 meters below the ground surface, in suitable rock formations. The materials used for the construction of t ...

EPFL2015

The Pore Structure Of Compacted And Partly Saturated Mx-80 Bentonite At Different Dry Densities

Alessio Ferrari, Ali Seiphoori

Compacted MX-80 bentonite is a potential backfill material in radioactive-waste repositories. Pore space in MX-80 has been the subject of considerable debate. 3D reconstructions of the pore space based on tomographic methods could provide new insights into ...

Clay Minerals Soc2014

Packing and permeability properties of E-glass fibre reinforcements functionalised with capsules for self-healing applications

Véronique Michaud, Erica Manfredi

In the framework of the development of capsule-based self-healing composites, this work investigates whether the capsules containing self-healing agents, dispersed on dry glass fibre reinforcements, influence their packing and longitudinal and transverse p ...

Elsevier2014

Al2O3/W hetero-structured nanopore membranes: From native to tunable nanofluidic diodes

Jürgen Brugger, Philippe Renaud, Arnaud Bertsch, Songmei Wu, Fabien Patrick Wildhaber

We present here Al2O3/W hetero-structured nanopore membranes which function as native and electrical field tunable nanofluidic diodes. A typical membrane is 100×100 μm2 in size with pore density of ∼ 20/μm2. The nanopores are 26 nm in diameter and 400 nm i ...

IEEE2013

Analysis of Solid Oxide Fuel Cell LSM-YSZ Composite Cathodes With Varying Starting Powder Sizes

Christos Comninellis, Jan Van Herle, Pietro Tanasini

Solid oxide fuel cell cathodes have been examined using non-destructive x-ray nanotomography. The cathodes examined were a composite of strontium-doped lanthanum manganite (LSM) and yttria-stabilized zirconia (YSZ), with three different starting powder siz ...

2011

Multiple Nanowire Species Synthesized on a Single Chip by Selectively Addressable Horizontal Nanochannels

Anna Fontcuberta i Morral

The synthesis of horizontal porous anodic alumina (PAA) structures with individually addressable channel systems is demonstrated. This was achieved by developing a multicontact design of aluminum finger structures (two to Five contacts) on silicon wafers. ...

American Chemical Society2010

Nanoporous SiN membranes patterned by wafer-scale nanosphere lithography

Jürgen Brugger, Andreea Veronica Savu, Oscar Vazquez Mena, Harry Heinzelmann, Mona Julia Katharina Klein, Raphaël Pugin, Franck Montagne

Nanoporous SiN membranes are interesting for a number of applications, e.g. stenciling, filtration, or tissue engineering [1-3]. The patterning of the pores requires a high resolution lithographic tool. Focused ion beam milling or e-beam lithography fulfil ...

2010

Hydrogeochemical Modelling of Variably Saturated Soils : Model Development and Application to Bauxite Refining Residue

Laurin Wissmeier

This thesis is about the simulation of flow, transport and geochemical reactions in variably saturated soils. Motivated by the problematic disposal and revegetation of residue from aluminium refining, novel modelling tools for general geochemical reactions ...

EPFL2010

Evolution of unsaturated hydraulic conductivity of aggregated soils due to compressive forces

Dani Or

Prediction of water flow and transport processes in soils susceptible to structural alteration such as compaction of tilled agricultural lands or newly constructed landfills rely on accurate description of changes in soil unsaturated hydraulic conductivity ...

2008