Naslov
The Effect of Ionic Strength and Electrolyte Type on Formation of Polyelectrolyte Multilayers

Autori
Kovačević, Davor

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
9th Conference of Colloid Chemistry : Book of Abstracts / - , 2007, 63-63

Skup
9th Conference of Colloid Chemistry

Mjesto i datum
Siófok, Mađarska, 03.10.2007. - 05.10.2007

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
polyelectrolyte multilayers ; optical reflectometry ; ionic strength

Sažetak
The layer-by-layer deposition method to prepare multilayers of polyelectrolytes of alternating charge has been followed in situ by means of stagnation point optical reflectometry (SPOR). It has been shown that SPOR presents a very useful method for monitoring such formation processes. The influence of different salts, their concentration and polyelectrolyte molecular weight on formation and erosion of multilayers on silica surfaces was investigated. It was observed that at higher ionic strength dissolution also takes place, and the critical "glass transition ionic strength" needed for the multilayer to be dissolved depends on the salt used, as well as on the polycation/polyanion pair studied. Additionally, optical reflectometry was applied for monitoring the build-up of polyelectrolyte/protein and polyelectrolyte/diblock copolymer multilayers, as well as for the investigation of distinction between linear and exponential (or superlinear) growth of polyelectrolyte multilayers. It has been shown that the formation of polyelectrolyte multilayers on metal oxide surface is largely governed by the phase behavior of polyelectrolyte complexes in solution and that the presence of different salts influences in similar manner both polyelectrolyte complex formation in solution and polyelectrolyte multilayer formation process. In order to additionally clarify the influence of added salt on behavior of polyelectrolytes in general, microcalorimetric, potentiometric and conductometric experiments were performed. Different trends of enthalpy changes upon titrations of polyelectrolyte solutions with solutions of sodium halides were observed showing that specific ionic effects play an important role in polyelectrolyte- polyelectrolyte interactions.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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