Microphase morphology in two dimensional fluids under lateral confinement

Details Microphase morphology in two dimensional fluids under lateral confinement Microphase morphology in two dimensional fluids under lateral confinement

2007-09-13

arxiv.org/abs/0709.2068v1

Physics

Condensed Matter

Soft Condensed Matter

accepted by Physical Review E (rapid communications)

Scientific paper

10.1103/PhysRevE.76.040402

We study the effects of confinement between two parallel walls on a two dimensional fluid with competing interactions which lead to the formation of particle micro-domains at the thermodynamic equilibrium (microphases or microseparation). The possibility to induce structural changes of the morphology of the micro-domains is explored, under different confinement conditions and temperatures. In presence of neutral walls, a switch from stripes of particles to circular clusters (droplets) occurs as the temperature decreases, which does not happen in bulk. While the passage from droplets to stripes, as the density increases, is a well known phenomenon, the change of the stripes into droplets as an effect of temperature is rather unexpected. Depending on the wall separation and on the wall-fluid interaction parameters, the stripes can switch from parallel to perpendicular to the walls and also a mixed morphology can be stable.

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