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Arrested demixing opens route to bigels

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Pattern morphology in the elastic sewing machine

Pedro Miguel Nunes Pereira de Almeida Reis

We present results from a numerical investigation of the coiling patterns obtained when a slender elastic rod is deployed onto a moving substrate. The Discrete Elastic Rods method is employed to explore the parameter space, construct phase diagrams, identi ...

2014

Colloidal Processing and Yield Stress Modeling Towards Dry Pressed Green Bodies for Transparent Polycrystalline Alumina

Paul Bowen, Michael Stuer

Colloidal processing is a key aspect in modern ceramic processing but most formulations are found empirically. The need for a better knowledge based design of suspension formulation can be achieved by using interparticle potential modelling linked to rheol ...

Wiley-Blackwell2014

Enhanced tunneling conductivity induced by gelation of attractive colloids

Peter Ryser, Claudio Grimaldi, Francesco Varrato, Giuseppe Foffi, Biagio Nigro

We show that the formation of a gel by conducting colloidal particles leads to a dramatic enhancement in bulk conductivity, due to interparticle electron tunneling, combining predictions from molecular-dynamics simulations with structural measurements in a ...

Amer Physical Soc2013

Multistep kinetic self-assembly of DNA-coated colloids

Francesco Varrato, Giuseppe Foffi

Equilibrium self-assembly relies on the relaxation of disordered mixtures of building blocks towards an ordered ground state. The main drawback of this traditional approach lies in the kinetic traps that often interrupt the progression of the system toward ...

Nature Publishing Group2013

Advances in Janus Nanoparticles

Francesco Stellacci, Javier Reguera Gomez

The design and synthesis of Janus nanoparticles has attracted great scientific interest in recent years. Novel optical, electronic, magnetic, and superficial properties emerge from their dimensions and unique morphology at the nanoscale. Additional propert ...

Swiss Chemical Soc2013

Routes to Novel Colloidal Gels

Francesco Varrato

The thesis describes how demixing of binary colloidal mixtures could be used to design new kinds of amorphous structures. We show that a rich phase behavior emerges, dependent on density (colloidal concentration) and composition (species relative populatio ...

EPFL2012

A unified framework for non-Brownian suspension flows and soft amorphous solids

Matthieu Wyart

While the rheology of non-Brownian suspensions in the dilute regime is well understood, their behavior in the dense limit remains mystifying. As the packing fraction of particles increases, particle motion becomes more collective, leading to a growing leng ...

2012

Yielding of weakly attractive nanoparticle networks

Esther Amstad

We propose a scaling law that explicitly correlates the macroscopic yield stress of weakly attractive nanoparticle networks with features of the microscopic aggregates that form the percolating gel. The proposed law correctly predicts experimental data obt ...

Royal Society of Chemistry2011

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

Suliana Manley

We investigate the structural, dynamical, and rheological properties of colloid-polymer mixtures in a volume fraction range of φ=0.15-0.35. Our systems are density-matched, residual charges are screened, and the polymer-colloid size ratio is ∼0.37. For the ...

American Institute of Physics2010

Modeling two-phase flows on moving domains

Matthias Preisig

Mudflows are catastrophic events that cause immense damage to infrastructure and life every year. Local authorities have been trying to mitigate the risk by zoning regulations as well as by building protection structures for many years. These measures have ...

EPFL2008