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Developing optofluidic technology through the fusion of microfluidics and optics

Publications associées (34)

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Confinement-induced liquid ordering investigated by x-ray phase retrieval

Hairun Guo, Christian David

Using synchrotron x-ray diffraction, we have determined the ensemble-averaged density profile of colloidal fluids within confining channels of different widths. We observe an oscillatory ordering-disordering behavior of the colloidal particles as a functio ...

2007

Holographic grating formation in a colloidal suspension of silver nanoparticles

Demetri Psaltis, James Adleman

Holographic gratings are recorded in colloidal suspensions of silver nanoparticles by utilizing interfering nanosecond pulses. The diffraction efficiency is measured with continuous-wave light. An instantaneous response together with a transient grating ar ...

2006

Self-assembled nanostructures prepared by colloidal chemistry

Frédéric Juillerat

The use of nanomaterials has been shown to be promising in potential applications such as magnetic storage devices, nano-optical devices and sensors, amongst others. Such applications require the disposition of nanoparticles, of a wide variety of materials ...

EPFL2006

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

Aging in short-ranged attractive colloids: A numerical study

Giuseppe Foffi, Francesco Sciortino

The aging dynamics in a model for dense simple liquids, in which particles interact through a hard-core repulsion complemented by a short-ranged attractive potential, of the kind found in colloidal suspensions, was studied. Kinetically arrested disordered ...

2004

Organisation and electrochemical reactivity at molecular interfaces

Organisation and heterogeneous photoreactivity of water-soluble zinc meso-tetrakis(4-carboxyphenyl) porphyrin (ZnTPPC) were investigated at polarisable liquid / liquid interfaces by systematically varying the organic phase solvent. The remarkable affinity ...

EPFL2004

Limits to gelation in colloidal aggregation

Suliana Manley

The dynamics of large fractal colloid aggregates, which were described by a combination of translational and rotational diffusion and internal elastic fluctuations, were investigated. Light scattering was used to measure dynamics of colloidal aggregates fo ...

2004

A ferrofluid micropump for lab-on-a-chip applications

Martinus Gijs, Heinrich Hofmann, Christophe Yamahata, Mathieu Chastellain

A disposable micropump is presented that uses the piston actuation principle and relies on the magnetic properties of a ferrofluid, a colloidal suspension of nanosize ferromagnetic particles. The cost effective micropump consists of 7 bonded layers of poly ...

2003

Ideal glass in attractive systems with different potentials

Giuseppe Foffi, Francesco Sciortino

We discuss the ideal glass transition for two types of potential model of attractive colloidal systems, i.e. the square-well system and the Yukawa hard-sphere fluid. We use the framework of the ideal mode-coupling theory and we mostly focus our attention o ...

2002

Higher-order glass-transition singularities in colloidal systems attractive

Giuseppe Foffi, Francesco Sciortino, Martin Fuchs

The transition from a liquid to a glass in colloidal suspensions of particles interacting through a hard core plus an attractive square-well potential is studied within the rnode-coupling-theory framework. When the width of the attractive potential is much ...

2001