Effective electrostatic interactions between 2-D colloid particles: a modeling approach
碩士 === 國立中央大學 === 生物物理研究所 === 98 === Interaction among charged colloidal particles has been investigated for long. One remarkable success, the so-called DLVO theory, considered the effects of both the van der Waals attraction and the screened Coulomb repulsion. In our current work, both the attracti...
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| Format: | Others |
| Language: | en_US |
| Published: |
2010
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| Online Access: | http://ndltd.ncl.edu.tw/handle/98385187035370582656 |
| Summary: | 碩士 === 國立中央大學 === 生物物理研究所 === 98 === Interaction among charged colloidal particles has been investigated for long. One remarkable success, the so-called DLVO theory, considered the effects of both the van der Waals attraction and the screened Coulomb repulsion. In our current work, both the attractive and repulsive parts of the effective potential energy are observed while we consider the electrostatic effect only. In our model, we investigate the regime where the electrostatic interaction dominates and the counter-ions condense or fluctuate nearby each macro-ion. We use Monte Carlo simulations to obtain the average electrostatic interactions versus the distance between two macro-ions embedded in 2-dimensions.
When the number of counter-ions is small, we obtain a short-range attraction and long-range repulsion. However, the attraction tends to vanish when the number of counter-ions increases. We provide possible scenarios for the sources of the attraction and repulsion.
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