Issue
EPL
Volume 85, Number 5, March 2009
Article Number 56004
Number of page(s) 6
Section Condensed Matter: Structural, Mechanical and Thermal Properties
DOI http://dx.doi.org/10.1209/0295-5075/85/56004
Published online 20 March 2009
EPL, 85 (2009) 56004
DOI: 10.1209/0295-5075/85/56004

Self-assembly of binary nanoparticle dispersions: From square arrays and stripe phases to colloidal corrals

C. I. Mendoza and E. Batta

Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México - Apdo. Postal 70-360, 04510 México, D.F., Mexico

cmendoza@iim.unam.mx

received 15 January 2009; accepted in final form 19 February 2009; published March 2009
published online 20 March 2009

Abstract
The generation of nanoscale square and stripe patterns is of major technological importance since they are compatible with industry-standard electronic circuitry. Recently, a blend of diblock copolymer interacting via hydrogen bonding was shown to self-assemble in square arrays. Motivated by those experiments we study, using Monte Carlo simulations, the pattern formation in a two-dimensional binary mixture of colloidal particles interacting via isotropic core-corona potentials. We find a rich variety of patterns that can be grouped mainly in aggregates that self-assemble in regular square lattices or in alternate strips. Other morphologies observed include colloidal corrals that are potentially useful as surface templating agents. This work shows the unexpected versatility of this simple model to produce a variety of patterns with high technological potential.

PACS
64.75.Yz - Self-assembly.
82.70.Dd - Colloids.
82.35.Jk - Copolymers, phase transitions, structure.

© EPLA 2009