Structure of Adsorbed Polyelectrolyte Monolayers Investigated by Combining Optical Reflectometry and Piezoelectric Techniques

Polyelectrolyte monolayers on solid substrates are studied with optical reflectivity and the quartz crystal microbalance (QCM). In particular, we investigate the adsorption of anionic poly(styrene sulfonate) (PSS) on amino-functionalized silica as well as cationic poly(allylamine hydrochloride) (PAH...

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Veröffentlicht in:	Langmuir 2012-04, Vol.28 (13), p.5642-5651
Hauptverfasser:	Porus, Maria, Maroni, Plinio, Borkovec, Michal
Format:	Artikel
Sprache:	eng
Schlagworte:	Adsorption Chemistry Electricity Electrolytes - chemistry Exact sciences and technology General and physical chemistry Optical Phenomena Polystyrenes - chemistry Quartz Crystal Microbalance Techniques Surface physical chemistry Water - chemistry
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creator	Porus, Maria Maroni, Plinio Borkovec, Michal
description	Polyelectrolyte monolayers on solid substrates are studied with optical reflectivity and the quartz crystal microbalance (QCM). In particular, we investigate the adsorption of anionic poly(styrene sulfonate) (PSS) on amino-functionalized silica as well as cationic poly(allylamine hydrochloride) (PAH) and poly-l-lysine (PLL) on bare silica. By comparing the dry and wet masses measured on identical substrates with these two techniques, we obtain information on the layer thickness and water content of these layers. Monolayers typically feature an adsorbed dry mass of about 0.1–2 mg/m2, a layer thickness of 0.5–2 nm, and a water content of 20–50%. One finds that the layer thickness increases with increasing concentrations of monovalent salts and polyelectrolytes.
doi_str_mv	10.1021/la204855j
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subjects	Adsorption Chemistry Electricity Electrolytes - chemistry Exact sciences and technology General and physical chemistry Optical Phenomena Polystyrenes - chemistry Quartz Crystal Microbalance Techniques Surface physical chemistry Water - chemistry
title	Structure of Adsorbed Polyelectrolyte Monolayers Investigated by Combining Optical Reflectometry and Piezoelectric Techniques
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