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Arrested fluid-fluid phase separation in depletion systems: Implications of the characteristic length on gel formation and rheology

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Hybrid glass mat reinforced polypropylene-montmorillonite nanocomposites

Véronique Michaud, John Christopher Plummer, Sara Dalle Vacche, Chrystèle Houphouet-Boigny Favre

Although addition of montmorillonite (MMT) clay to isotactic polypropylene (iPP) results in large increases in the melt viscosity at low shear rates, satisfactory impregnation of glass mats is obtained with iPP/MMT under conditions typical of industrial pr ...

Trans Tech Publications Ltd, Laublsrutistr 24, Ch-8717 Stafa-Zurich, Switzerland2009

Temperature-Dependent Elasticity of Microtubules

László Forró, Andras Kis, Andrzej Kulik, Sandor Kasas

Central to the biological function of microtubules. is their ability to modify their length which occurs by addition and removal of subunits at the ends of the polymer, both in vivo and in vitro. This dynamic behavior is strongly influenced by temperature. ...

American Chemical Society2008

Sliding-induced adhesion of stiff polymer microfiber arrays. II. Microscale behaviour

Bryan Edward Schubert

The adhesive pads of geckos provide control of normal adhesive force by controlling the applied shear force. This frictional adhesion effect is one of the key principles used for rapid detachment in animals running up vertical surfaces. We developed polypr ...

2008

Tensile behaviour of discontinuous two-phase materials

Randoald Müller

Particle reinforced metal matrix composites are manufactured by high-pressure infiltration. These composites contain roughly 50% by volume of discrete alumina inclusions dispersed homogeneously in a continuous aluminium-based matrix. Three matrices, namely ...

EPFL2007

Plasticity and geophysical flows: A review

Christophe Ancey

The objective of this review is to examine how the concept of plasticity is used in geophysical fluid dynamics. Rapid mass movements such as snow avalanches or debris flows involve slurries of solid particles (ice, boulder, clay, etc.) within an interstiti ...

2007

Surface molecular view of colloidal gelation

Sylvie Roke

We investigate the phase behavior of surface-functionalized silica colloids at both the molecular and macroscopic levels. This investigation allows us to relate collective properties such as aggregation, gelation, and aging directly to molecular interfacia ...

2006

Tubular La0.7Ca0.3Fe0.85Co0.15O3-delta Perovskite Membranes, Part I: Preparation and Properties

Jan Van Herle, Stefan Diethelm

Dense tubular self-supporting La0.7Ca0.3Fe0.85 Co0.15O3-δperovskite membranes were prepared by thermoplastic extrusion. The rheological behavior of the ceramic mixture was studied. Non-deformed tubes o ...

2006

Low stress acrylated hyperbranched polymers

Lars Schmidt

The objective of this study was to investigate the behavior of highly functional acrylates, during isothermal ultraviolet (UV) curing. The materials included a pentafunctional acrylate and two acrylated hyperbranched polymers, one with a stiff polyester co ...

EPFL2006

Glasslike arrest in spinodal decomposition as a route to colloidal gelation

Suliana Manley

Colloid-polymer mixtures can undergo spinodal decomposition into colloid-rich and colloid-poor regions. Gelation results when interconnected colloid-rich regions solidify. We show that this occurs when these regions undergo a glass transition, leading to d ...

2005

Routes to colloidal gel formation

Giuseppe Foffi, Francesco Sciortino

We discuss features of simple inter-particle potentials which are able to generate low-packing fraction arrested states, i.e. gels, in the absence of a macroscopic phase separation phenomenon. We suggest that the ratio between surface and bulk free energy ...

2005