Correlation length of hydrophobic polyelectrolyte solutions

Details Correlation length of hydrophobic polyelectrolyte solutions Correlation length of hydrophobic polyelectrolyte solutions

2003-02-24

arxiv.org/abs/cond-mat/0302472v1

Europhys. Lett, vol. 62, pp. 588-594 (2003)

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 5 figures, submitted to Europhysics Letters

Scientific paper

10.1209/epl/i2003-00391-2

The combination of two techniques (Small Angle X-ray Scattering and Atomic Force Microscopy) has allowed us to measure in reciprocal and real space the correlation length $\xi$ of salt-free aqueous solutions of highly charged hydrophobic polyelectrolyte as a function of the polymer concentration $C_p$, charge fraction $f$ and chain length $N$. Contrary to the classical behaviour of hydrophilic polyelectrolytes in the strong coupling limit, $\xi$ is strongly dependent on $f$. In particular a continuous transition has been observed from $\xi \sim C_p^{-1/2}$ to $\xi\sim C_p^{-1/3}$ when $f$ decreased from 100% to 35%. We interpret this unusual behaviour as the consequence of the two features characterising the hydrophobic polyelectrolytes: the pearl necklace conformation of the chains and the anomalously strong reduction of the effective charge fraction.

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