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On the percolation of alginate/calcium systems at low concentrations

Adele Khavari (Institutionen för kemi och kemiteknik, Teknisk ytkemi ; SuMo Biomaterials) ; Jan-Erik Löfroth (Institutionen för kemi och kemiteknik, Teknisk ytkemi) ; Johan Bergenholtz ; Magnus Nydén
Carbohydrate Polymers (0144-8617). Vol. 137 (2016), p. 480–487.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Alginate, dynamic light scattering, gel, structure dynamics



Denna post skapades 2015-12-07. Senast ändrad 2016-03-21.
CPL Pubid: 227395

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Teknisk ytkemi
SuMo Biomaterials
Institutionen för kemi och molekylärbiologi (GU)

Ämnesområden

Yt- och kolloidkemi
Polymerkemi

Chalmers infrastruktur

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