David Haložan (Author), Gleb B. Sukhorukov (Author), Milan Brumen (Author), Edwin Donath (Author), Helmuth Möhwald (Author)

Abstract

A simple theoretical model of the Donnan equilibrium is applied to studies of distributions of ions between the external and internal volumes of hollow polyelectrolyte capsules as well as of concomitant osmotic pressure load on a capsule wall resulting from these distributions and the presence of polyanion. The model system consist of dispersed polyelectrolyte capsules in an electrolyte solution whereby two cases are considered with respect to the presence of the polyanion, either in the inner or external solution. It is assumed that the capsule wall is impermeable to polyanion, but water and all ions can freely penetrate. The model predictions are summarized by presenting the difference between the external pH, the pH of the inner solution and the osmotic pressure difference across the capsule wall, both in the dependence of sodium chloride concentration.

Keywords

biofizika;polielektroliti;polielektrolitske kapsule;Donnanovo ravnovesje;osmozna obremenitev;ne zaključna dela;

Data

Language: Slovenian
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FNM - Faculty of Natural Sciences and Mathematics
Publisher: Slovenian Chemical Society
UDC: 577
COBISS: 15589128 Link will open in a new window
ISSN: 1318-0207
Views: 2176
Downloads: 141
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Other data

Secondary language: English
Secondary abstract: Teoretičen model Donnanovega ravnovesja smo uporabili v študiji porazdelitve malih ionov med zunanjim in notranjim volumnom votlih polielektrolitskih kapsul, zaradi česar se spreminja tudi osmozna obremenitev stene kapsul ob prisotnosti poliiona. Model opisuje disperzijo polielektrolitskih kapsul v elektrolitski raztopini, kjer je poliion prisoten v zunanji ali notranji raztopini kapsule. Predpostavili smo, da je stena kapsule neprepustna za poliion in prepustna za vodo in majhne ione. Modelne napovedi so podane kot vrednosti pH notranje raztopine v odvisnosti od natrijevega klorida in razlike osmoznih tlakov na steno kapsule v odvisnosti od natrijevega klorida.
Secondary keywords: biophysics;polyelectrolytes;polyelectrolyte capsules;Donnan equilibrium;osmotic pressure;Biofizika;Polielektroliti;
URN: URN:NBN:SI
Type (COBISS): Scientific work
Pages: str. 598-604
Volume: ǂVol. ǂ54
Issue: ǂno. ǂ3
Chronology: 2007
ID: 1737960