Scaling of dynamics in 2d semi-dilute polymer solutions

Details Scaling of dynamics in 2d semi-dilute polymer solutions Scaling of dynamics in 2d semi-dilute polymer solutions

2003-11-14

arxiv.org/abs/cond-mat/0311352v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, revtex4, submitted

Scientific paper

10.1209/epl/i2004-10166-9

We study the viscoelasticity of surface polymer monolayers by measuring the dynamics of thermal concentration fluctuations with surface light scattering. For various systems of proteins and synthetic polymers we find a semi-dilute regime in which both the elastic and viscous components of the dilational modulus show power law dependencies on the concentration. Surprisingly there is a universal relationship between the exponents for the two components: the viscosity scales with a power double that of the elasticity. These results cannot be explained on the basis of theory developed for bulk systems, and a simple explanation for the singular 2d behavior is suggested.

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