Layer-by-Layer Growth of Attractive Binary Colloidal Particles

We investigate the two-dimensional (2D) colloidal structures formed by oppositely charged polystyrene monolayers grown layer-by-layer, where the electrostatic forces are recruited to assist in the packing of the layers. Our results show a transition through several 2D-superlattices to more close-pac...

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Bibliographic Details
Published in:Langmuir 2008-09, Vol.24 (17), p.9273-9278
Main Authors: Tan, Kwan Wee, Li, Guang, Koh, Yaw Koon, Yan, Qingfeng, Wong, C. C
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Colloids: Surfactants and Self-Assembly, Dispersions, Emulsions, Foams
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Surface physical chemistry
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Summary:We investigate the two-dimensional (2D) colloidal structures formed by oppositely charged polystyrene monolayers grown layer-by-layer, where the electrostatic forces are recruited to assist in the packing of the layers. Our results show a transition through several 2D-superlattices to more close-packed structures with increasing ionic strength. The observed geometrical packing constraints of the 2D-superlattice structures agree well with the estimated Debye screening length of the electric double layer. By tuning interaction forces between charged colloids, electrostatic interactions could enhance the template-directed self-assembly process to achieve more complex and diverse structures.
ISSN:0743-7463
1520-5827
DOI:10.1021/la8009089