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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
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Charged nanorods at heterogeneously charged surfaces.
Ali Naji1, Kasra Hejazi1, Elnaz Mahgerefteh1
1School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran.
The Journal of Chemical Physics
|October 8, 2018
Summary
Charged nanorods mediate strong attractions between randomly charged surfaces, overcoming repulsion. This effect, driven by electrostatic correlations and disorder interactions, leads to significant attraction at small separations.
Area of Science:
- Colloid and Interface Science
- Statistical Mechanics
- Computational Physics
Background:
- Traditional theories predict repulsion between equally charged surfaces.
- Multivalent counterions can induce attraction between uniformly charged surfaces via strong electrostatic couplings.
- Heterogeneous surface charge distributions and counterion properties significantly influence intersurface interactions.
Purpose of the Study:
- To investigate the spatial and orientational distribution of charged nanorods.
- To determine the effective interaction mediated by these nanorods between two surfaces with quenched heterogeneous charge distributions.
- To analyze the combined effects of electrostatic correlations and disorder-induced interactions on intersurface forces.
Main Methods:
- Theoretical modeling of charged nanorod behavior and interactions.
- Analysis of electrostatic correlations arising from surface charge heterogeneity and counterion valency.
- Investigation of disorder-induced interactions due to the coupling of surface disorder and counterion quadrupolar moments.
Main Results:
- Charged nanorods mediate significantly stronger attractive interactions between randomly charged surfaces compared to uniformly charged surfaces.
- Electrostatic correlations and disorder-induced interactions are key drivers of this enhanced attraction.
- The interaction profile is nonmonotonic, exhibiting an attractive minimum at small separations, exceeding strong-coupling attraction by over an order of magnitude.
Conclusions:
- The presence of multivalent, charged nanorods with monopolar and quadrupolar moments can induce substantial attraction between heterogeneous surfaces.
- Understanding these complex interactions is crucial for designing advanced materials and controlling interfacial phenomena.
- The findings challenge traditional repulsion predictions and highlight the importance of counterion properties and surface disorder in colloidal systems.
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