Soft Matter and Complex Systems Seminar
sala 1.40, ul. Pasteura 5
2021-03-26 (09:30) 
Alina Ciach (Institute of Physical Chemistry, PAS, Warszawa)
Systems with competing interactions near a confining wall
In the first part of the talk, simulation results for the structure near the boundary, and for the adsorption isotherms will be presented and discussed for model systems with short-range attraction and long-range repulsion (SALR). In particular, we will show that in the SALR systems an anomalous decrease of the adsorption for increasing chemical potential begins when the clusters start to dominate over single particles in the bulk.
In the second part of the talk, Euler-Lagrange (E-L) equations and boundary conditions (BC) for the density profile and correlation functions near the boundary will be derived from the classical DFT. The E-L equations allow for various approximations. The approximate equations corresponding to the generic model of self-assembly can be solved easily, and analytical expressions for the density and correlation functions will be shown. The BC represents in particular the effect of missing neighbors. Because in the SALR system the long-range repulsion by the fluid particles is not compensated near the boundary, an effective attraction to a hard wall is generated. The correlation function shows an increase of periodic ordering in directions parallel to the wall when the wall is approached.
The seminar will be conducted on Zoom
https://us02web.zoom.us/j/82784273907
In the second part of the talk, Euler-Lagrange (E-L) equations and boundary conditions (BC) for the density profile and correlation functions near the boundary will be derived from the classical DFT. The E-L equations allow for various approximations. The approximate equations corresponding to the generic model of self-assembly can be solved easily, and analytical expressions for the density and correlation functions will be shown. The BC represents in particular the effect of missing neighbors. Because in the SALR system the long-range repulsion by the fluid particles is not compensated near the boundary, an effective attraction to a hard wall is generated. The correlation function shows an increase of periodic ordering in directions parallel to the wall when the wall is approached.
The seminar will be conducted on Zoom
https://us02web.zoom.us/j/82784273907