Regensburg 2013 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 9: Poster: Interfaces and Thin Films (joint session with DECHEMA and VDI)
CPP 9.6: Poster
Monday, March 11, 2013, 17:30–19:30, Poster C
Slippage of polymers: Influence of the chemical structure — •Mischa Klos1, Sebastian Backes1, Matthias Lessel1, Oliver Bäumchen2, and Karin Jacobs1 — 1Saarland University, Experimental Physics, 66041 Saarbruecken, Germany — 2*Dept. of Physics & Astronomy McMaster University, Hamilton, ON, Canada
The continuing miniaturization of microfluidic devices causes a growing importance of the solid/liquid interface for the flow dynamics. Our experiments probe slippage using the dewetting process of thin polymer films on hydrophobic substrates [1]. As hydrophobic coatings, we use amorphous polymers (AF1600, AF2400) and different types of highly ordered self-assembled silane monolayers on top of ultraflat silicon substrates. On silane surfaces, polystyrene (PS) of low molecular weight exhibits slip lengths of several hundreds of nanometers up to even micrometers [2]. On AF1600, no significant slip is observable. Recent studies using scattering techniques showed an ordering effect of PS at the solid/liquid interface depending on the structure of the substrate [3]. Will the situation change if, instead of PS, other polymers like PMMA or PVP are used? In contrast to PS, PMMA has no phenyl rings. Moreover, we probe how the crystallinity of the substrate influences slippage: We show results of dewetting experiments supplemented with X-ray scattering methods to analyze the slippage mechanism at the solid/liquid interface. [1]O. Bäumchen et. al., J Phys Condens Matter, vol. 24, no. 32, pp. 325102, 2012 [2]R. Fetzer et, al., Europhys Lett, vol. 75, no. 4, pp. 638, 2006 [3]P. Gutfreund et al., arXiv.org, vol. cond-mat.soft. 2011