What question did this study set out to answer?

The research aims to explore how varying the pH of solutions affects layer thickness and wettability of polyelectrolyte multilayers.

Controlling Bilayer Composition and Surface Wettability of Sequentially Adsorbed Multilayers of Weak Polyelectrolytes

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Randomized trial demonstrates controlled surface wettability in multilayered polyelectrolyte films, suggesting new material applications.

The research aims to explore how varying the pH of solutions affects layer thickness and wettability of polyelectrolyte multilayers.
Sequential adsorption of poly(acrylic acid) and poly(allylamine) at different pH levels
Measurement of layer thickness and surface wettability using contact angle
Assessment of layer interpenetration using methylene blue adsorption
Layer thickness varied with pH but was unaffected by previously adsorbed layers.
Achieved advancing water contact angles from nearly zero to 50°.
Deposition process dominated by surface charge leading to highly interpenetrated layers.

Yoo et al. (1998) studied this question.

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