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-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.
Tan
Kwan Wee
KW
Singapore-MIT Alliance, N3.2-01-36, 65 Nanyang Drive, Singapore 637460.
Li
Guang
G
Koh
Yaw Koon
YK
Yan
Qingfeng
Q
Wong
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CC