On the pearl size of hydrophobic polyelectrolytes

Details On the pearl size of hydrophobic polyelectrolytes On the pearl size of hydrophobic polyelectrolytes

2002-12-10

arxiv.org/abs/cond-mat/0212227v2

Europhys. Lett., Vol. 62, pp. 110-116 (2003)

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 4 figures, 1 table. Published in Europhysics Letters, Vol. 62, Number 1, pp. 110-116 (2003)

Scientific paper

10.1209/epl/i2003-00369-6

Hydrophobic polyelectrolytes have been predicted to adopt an unique pearl-necklace conformation in aqueous solvents. We present in this Letter an attempt to characterise quantitatively this conformation with a focus on $D_p$, the pearl size. For this purpose polystyrenesulfonate (PSS) of various effective charge fractions $f_{eff}$ and chain lengths $N$ has been adsorbed onto oppositely charged surfaces immersed in water in condition where the bulk structure is expected to persist in the adsorbed state. \emph{In situ} ellipsometry has provided an apparent thickness $h_{app}$ of the PSS layer. In the presence of added salts, we have found: $h_{app}\sim aN^{0}f_{eff}^{-2/3}$ ($a$ is the monomer size) in agreement with the scaling predictions for $D_p$ in the pearl-necklace model if one interprets $h_{app}$ as a measure of the pearl size. At the lowest charge fractions we have found $h_{app}\sim aN^{1/3}$ for the shorter chains, in agreement with a necklace/globule transition.

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