Two-Dimensional Colloidal Alloys
AbstractCo-authors: Adam Law (Max-Planck-Institut fuer Intelligente Systeme), Melodie Auriol (Ecole Nationale Superieure de Chimie de Rennes), Dean Smith (University of Hull), Tommy Horozov (University of Hull)
We study the self-assembly of mixed monolayers of hydrophobic and hydrophilic colloidal particles adsorbed at oil/water interfaces both experimentally and theoretically. Experimentally, we find that by tuning the interactions, composition and packing geometry of the mixed monolayer, a rich variety of two-dimensional super-lattice  and cluster  structures are formed which are stabilised by strong electrostatic interactions mediated through the oil phase. The 2D structures obtained are in excellent agreement with zero temperature lattice sum calculations [1-3], indicating that the self-assembly process can be effectively controlled for the creation of novel 2D structures.
 A.D. Law, D.M.A. Buzza, T.S. Horozov, Phys. Rev. Lett., 106, 128302 (2011)  A.D. Law, M. Auriol, D. Smith, T.S. Horozov, D.M.A. Buzza, Phys. Rev. Lett., 110, 138301 (2013)  A.D. Law, T.S. Horozov, D.M.A. Buzza, Soft Matter, 7, 8923 (2011)