Adsorption of hydrophobic polyelectrolytes as studied by \emph{in situ} high energy X-Ray reflectivity

Details Adsorption of hydrophobic polyelectrolytes as studied by \emph{in situ} high energy X-Ray reflectivity Adsorption of hydrophobic polyelectrolytes as studied by \emph{in situ} high energy X-Ray reflectivity

2004-03-04

arxiv.org/abs/cond-mat/0403139v1

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 7 figures, 1 table, submitted to Phys. Rev. E

Scientific paper

A series of well-defined hydrophilic and hydrophobic polyelectrolytes of various chain lengths $N$ and effective charge fractions $f_{eff}$ have been adsorbed onto oppositely charged solid surfaces immersed in aqueous solutions. \emph{In situ} high energy X-ray reflectivity has provided the thickness $h$, the electron density and the roughness of the adsorbed layer in its aqueous environment. In the case of hydrophobic polyelectrolytes, we have found $h\propto N^0 f_{eff}^{-2/3}$, in agreement with a pearl-necklace conformation for the chains induced by a Rayleigh-like instability.

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