Dresden 2014 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 54: Poster Session 3

CPP 54.32: Poster

Thursday, April 3, 2014, 15:00–19:00, P2

Self assembly of order micro pore structure prepared by water vapor condensation on evaporative polystyrene solution — •Farid Farajollahi, Masoud Amirkhani, and Othmar Marti — Institute of Experimental Physics, Ulm University, Ulm, Germany

The condensation of water vapor on the evaporative polymeric solution does produce micro-droplets of water (MDW), which leave their trace on the surface after evaporation of both solvent and water. In the proper condition, polymer and organic solvents can effectively reduce the coalescence rate of MDW and form a self assemble hexagonal structure. The polymeric solution consisted of polystyrene and chloroform mixed with different short-chain alcohols (methanol, ethanol and n-propanol) was studied. At a fixed polystyrene concentration, the order pattern formation initiates at specific concentration for each alcohol and reduced by increasing the length of hydrophobic chain alcohol. The pattern observed only within a certain range of alcohol concentrations, which is wider for methanol and become narrow for longer chain alcohols. For each alcohol, the required concentration for pattern formation has reverse relation to the polymer concentration of the solution. As the hydrophobic part of the alcohol chain becomes longer, higher polystyrene concentration is needed to achieve the micro pore pattern.