Regensburg 2000 – scientific programme

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DY: Dynamik und Statistische Physik

DY 17: POSTER I

DY 17.14: Poster

Monday, March 27, 2000, 15:00–18:00, D

Computer simulations of Polyampholyte Systems — •Motohiko Tanaka¹ and Christian Holm² — ¹National Institute for Fusion Science, Toki 509-5292, Japan — ²MPI für Polymerforschung, Ackermannweg 10, 55128 Mainz

We report preliminary data of molecular dynamics simulations on solutions of randomly charged polyampholytes, that are polymers containing charges of both signs [1]. We will study the bulk as well as the single chain properties of such systems as a function of salt concentration, counterion density, counterion type, charge offset δ Q, and polymer density. If the charge offset of theses systems is larger than √(N), where N is the number of charges, a pearl-necklace behavior was predicted. We investigate the correctness of this prediction for typical polyampholyte samples and investigate if this remains true if the addition of counterions is allowed.

[1] M. Tanaka, A.Y. Grosberg, and T. Tanaka, J. Chem. Phys. 110, 8176 (1999)