Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Poster Session I

CPP 20.7: Poster

Montag, 12. März 2018, 17:30–19:30, Poster A

Adsorption of finite semiflexible polymers and their loop and tail distributions — •Tobias A. Kampmann and Jan Kierfeld — TU Dortmund University, Germany

We discuss the adsorption of semiflexible polymers to a planar attractive wall and focus on the questions of the adsorption threshold for polymers of finite length and their loop and tail distributions using both Monte-Carlo simulations and analytical arguments. For the adsorption threshold, we find three regimes: (i) a flexible or Gaussian regime if the persistence length is smaller than the adsorption potential range, (ii) a semiflexible regime if the persistence length is larger than the potential range, and (iii) for finite polymers, a novel crossover to a rigid rod regime if the deflection length exceeds the contour length. In the flexible and semiflexible regime, finite size corrections arise because the correlation length exceeds the contour length. In the rigid rod regime, however, it is essential how the global orientational or translational degrees of freedom are restricted by grafting or confinement. For the loop and tail distributions, we find power laws with an exponential decay on length scales exceeding the correlation length. This allows us to explain that, close to the transition, flexible and semiflexible polymers desorb by expanding their tail length.