On the percolation of alginate/calcium systems at low concentrations
Artikel i vetenskaplig tidskrift, 2016

The sol-to-gel transition of an alginate rich in β-d-mannuronic acid residues and at a concentration of 0.1% w/v in 15 mM NaCl in the presence of calcium ions of 0 to 3.5 mM was studied with dynamic light scattering. The dynamics of the different systems added further insight into the alginate gel forming mechanisms. Below a Ca2+ concentration of 0.7 mM, the build-up of small aggregates could be verified. Moreover, at a critical concentration, close to 0.9 mM Ca2+, a percolated, non-ergodic network started to form from some of these aggregates, with smaller aggregates still diffusing in the network. The system displayed strong non-ergodicy at high Ca2+ concentrations with a non-ergodicity parameter that appeared to form discontinuously from near zero to a clearly non-zero value at the critical Ca2+ concentration.

dynamic light scattering

gel

structure dynamics

Alginate

Författare

Adele Khavari

SuMo Biomaterials

Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Jan-Erik Löfroth

Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Johan Bergenholtz

Göteborgs universitet

Magnus Nydén

UCL

Carbohydrate Polymers

0144-8617 (ISSN)

Vol. 137 480-487

Ämneskategorier

Polymerkemi

Fysikalisk kemi

DOI

10.1016/j.carbpol.2015.11.019