Naslov
Effect of ionic strength on formation of polyelectrolyte complexes in solution ; a comparison with corresponding polyelectrolyte multilayers

Autori
Kovačević, Davor

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

Izvornik
29th International Conference on Solution Chemistry : Book of abstracts / Bešter-Rogač, Marija ; Vlachy, Vojko - Ljubljana : Faculty o Chemistry and Chemical Technology, 2005, 157-157

Skup
29th International Conference on Solution Chemistry

Mjesto i datum
Portorož, Slovenija, 21.08.2005. - 25.08.2005

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
polyelectrolyte complexes ; ionic strength ; polyelexctrolyte multilayers ; nephelometry ; conductometry ; electrophoretic light scattering

Sažetak
Mixing of aqueous solutions of positively and negatively charged polyelectrolytes results in formation of polyelectrolyte complexes, predominantly due to the electrostatic interactions between oppositely charged chains. It is known that the presence of electrolytes and ionic strength influences the formation of such complexes. On the other hand, it has been shown recently that same factors significantly influence the process of formation and erosion of polyelectrolyte multilayers obtained by alternatingly dipping a substrate into, or flushing with, solutions that contain the negative and the positive polyelectrolyte, respectively. The influence of different salts (KCl, NaNO3, Na2HPO4 + KH2PO4) and ionic strength on polyelectrolyte complexes formed by mixing aqueous solutions of poly(dimethylaminoethylmetacrylate) (PAMA) and polyacrylic acid (PAA) was investigated. The methods used for the investigation of complex formation were nephelometry, conductometry and electrophoretic light scattering. The obtained results were compared with results obtained by investigating the effects of salts and ionic strength on multilayer formation process. These experiments were based on alternate adsorption of same components (PAMA and PAA) on silica using stagnation point optical reflectometry method. It has been shown that the behavior of polyelectrolyte multilayers formed on metal oxides is governed by the same principles as that of corresponding polyelectrolyte complexes in solution.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA