Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 13: Solid / liquid interfaces I

O 13.6: Vortrag

Montag, 14. März 2011, 16:15–16:30, WIL B321

Water lithography: a bottom-up solution — Nicola Berger, •Masoud Amirkhani, Frank Zocholl, Mohamed Abdel Mohsen, and Othmar Marti — Institut für Experimentelle Physik Universität Ulm Albert-Einstein-Allee 11 89081 Ulm, Germany

Porous honeycomb-structured polymer films can be obtained by Breath Figure (BF) technique. Highly ordered honeycomb structures were readily formed by blowing airflow across the solution surface in a moist atmosphere (humidity 80%) after a 2 wt % polystyrene monocarboxy(PSC) terminated in toluene was drop-cast on a glass slide. The results show, solvent (toluene, chloroform and carbon disulfide) does not change bubble diameter and regularity of the pattern within an ordered area, whereas the size of the regular area is significantly larger for chloroform and carbon disulfide.

Silica particles were added to both solutions of PSC and polystyrene (PS) in order to find the effect of particles on the pattern formation. Our study shows silica particles does not have any effect on the pattern formation of PSC solution. However, while linear PS cannot produce a regular pattern through BF technique, mixing of silica particles with PS solution can form a good pattern. The size of a bubble varies around 4% within a regular area, but it changes in the different area from 5 to 7 μm for PSC and from 6 to 9 μm for mixed particles and PS solution.