Výsledky vyhledávání - "van Megen, W."

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Non-equilibrium dynamics of the glass transition: new perspectives from colloidal hard spheres

A fresh approach to the data from experiments with hard sphere colloids yields seminal insights into the glass transition. The precise determination of the fraction of particles caged by their neighbours is unprecedented and provides cornerstone of o

Externí odkaz: http://arxiv.org/abs/2109.14435

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Entropic identification of the first order freezing transition of a suspension of hard sphere particles

Autor: van Megen, W., Schöpe, H. J.

Publikováno v: Phys. Rev. Lett. 124, 205701 (2020)

We analyse the experimental particle current auto correlation function (CAF) of suspensions of hard spheres. Interactions between the particles are mediated by thermally activated acoustic excitations in the solvent. Those acoustic modes are tantamou

Externí odkaz: http://arxiv.org/abs/2004.11048

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The cage effect in systems of hard spheres

Autor: van Megen, W., Schöpe, H. J.

The cage effect is generally invoked when discussing the delay in the decay of time correlation functions of dense fluids. In an attempt to examine the role of caging more closely we consider the spread of the displacement distributions of Brownian p

Externí odkaz: http://arxiv.org/abs/1702.04865

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Dynamics of hard-sphere suspension using Dynamic Light Scattering and X-Ray Photon Correlation Spectroscopy: dynamics and scaling of the Intermediate Scattering Function

Autor: Martinez, V. A., Thijssen, J. H. J, Zontone, F., van Megen, W., Bryant, G.

Intermediate Scattering Functions (ISF's) are measured for colloidal hard sphere systems using both Dynamic Light Scattering (DLS) and X-ray Photon Correlation Spectroscopy (XPCS). We compare the techniques, and discuss the advantages and disadvantag

Externí odkaz: http://arxiv.org/abs/1008.2070

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Ageing dynamics of colloidal hard sphere glasses

Autor: Martinez, V. A., Bryant, G., van Megen, W.

We report results of dynamic light scattering measurements of the coherent intermediate scattering function (ISF) of glasses of hard spheres for several volume fractions and a range of scattering vectors around the primary maximum of the static struc

Externí odkaz: http://arxiv.org/abs/1005.4721

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Arrest of flow and emergence of activated processes at the glass transition of a suspension of particles with hard sphere-like interactions

Autor: van Megen, W., Martinez, V. A., Bryant, G.

By combining aspects of the coherent and self intermediate scattering functions, measured by dynamical light scattering on a suspension of hard sphere-like particles, we show that the arrest of particle number density fluctuations spreads from the po

Externí odkaz: http://arxiv.org/abs/0811.4207

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