This title appears in the Scientific Report :
2009
Please use the identifier:
http://hdl.handle.net/2128/4656 in citations.
Please use the identifier: http://dx.doi.org/10.1063/1.3078408 in citations.
Structure and Short-Time Dynamics in Suspensions of Charged Silica Spheres in the Entire Fluid Regime
Structure and Short-Time Dynamics in Suspensions of Charged Silica Spheres in the Entire Fluid Regime
We present an experimental study of short-time diffusion properties in fluidlike suspensions of monodisperse charge-stabilized silica spheres suspended in dimethylformamide. The static structure factor S(q), the short-time diffusion function D(q), and the hydrodynamic function H(q) have been probed...
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Personal Name(s): | Gapinski, J. |
---|---|
Patkowski, A. / Banchio, A.J. / Buitenhuis, J. / Holmqvist, P. / Lettinga, M. P. / Meier, G. / Nägele, G. | |
Contributing Institute: |
Weiche Materie; IFF-7 |
Published in: | The @journal of chemical physics, 130 (2009) S. 084503 |
Imprint: |
Melville, NY
American Institute of Physics
2009
|
Physical Description: |
084503 |
PubMed ID: |
19256611 |
DOI: |
10.1063/1.3078408 |
Document Type: |
Journal Article |
Research Program: |
Kondensierte Materie |
Series Title: |
Journal of Chemical Physics
130 |
Subject (ZB): | |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1063/1.3078408 in citations.
We present an experimental study of short-time diffusion properties in fluidlike suspensions of monodisperse charge-stabilized silica spheres suspended in dimethylformamide. The static structure factor S(q), the short-time diffusion function D(q), and the hydrodynamic function H(q) have been probed by combining x-ray photon correlation spectroscopy experiments with static small-angle x-ray scattering. Our experiments cover the full liquid-state part of the phase diagram, including de-ionized systems right at the liquid-solid phase boundary. We show that the dynamic data can be consistently described by the renormalized density fluctuation expansion theory of Beenakker and Mazur over a wide range of concentrations and ionic strengths. In accordance with this theory and Stokesian dynamics computer simulations, the measured short-time properties cross over monotonically, with increasing salt content, from the bounding values of salt-free suspensions to those of neutral hard spheres. Moreover, we discuss an upper bound for the hydrodynamic function peak height of fluid systems based on the Hansen-Verlet freezing criterion. |