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Full Paper
Correlations and Fluctuations of Charged Colloids as Determined by Anomalous Small-Angle X-Ray Scattering
Article first published online: 10 APR 2006
DOI: 10.1002/mats.200500084
Copyright © 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Additional Information
How to Cite
Jusufi, A. and Ballauff, M. (2006), Correlations and Fluctuations of Charged Colloids as Determined by Anomalous Small-Angle X-Ray Scattering. Macromol. Theory Simul., 15: 193–197. doi: 10.1002/mats.200500084
Publication History
- Issue published online: 10 APR 2006
- Article first published online: 10 APR 2006
- Manuscript Accepted: 6 DEC 2005
- Manuscript Received: 25 NOV 2005
- Abstract
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Keywords:
- colloids;
- liquid structure;
- molecular dynamics;
- simulations;
- small-angle X-ray scattering (SAXS)
Abstract
Summary: We performed molecular dynamics simulation of a charged colloidal particle with explicit counterions. Our work provides a direct comparison between simulations and ASAXS-experiments, offering insight into the counterion distribution of charged colloidal suspensions. We give a detailed constitution of the appearing scattering terms with their physical meaning. It is shown that the cross-correlation between a macroion and its counterions gives the meanfield approximation of the counterion density even if the counterion system is highly fluctuating. Furthermore, it is shown that cross-correlations can be negative due to oscillations of the density amplitudes of the macroion and counterions and, therefore, must be distinguished from other scattering contributions. These oscillations become more pronounced if the counterions exhibit a fixed shape and if the size of the macroion and that of the counterion system are different.