Reaggregation of sodium alginate microgel structures after shear-induced deaggregation at filtering

• Published in: Polymer bulletin (Berlin, Germany) Vol. 54; no. 1-2; pp. 93 - 100
• Main Authors: RENDEVSKI, Stojan J, ANDONOVSKI, Aleksandar N
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.05.2005; Berlin Springer Nature B.V; New York, NY
• Subjects: Applied sciences; Calcium ions; Exact sciences and technology; Filtration; Microgels; Natural polymers; Physicochemistry of polymers; Room temperature; Sodium alginate; Starch and polysaccharides; Filtration; Light scattering; Gelation; Electrostatic interaction; Uronide polymer; Alginates; Experimental study; Mechanism; Polyelectrolyte; Electric birefringence; Calcium ion; Investigation method; Optical properties; Concentration effect; Microgel; Oside polymer; Kinetics; Aqueous solution; Saline solution
• DOI: 10.1007/s00289-005-0356-7
• ISSN: 0170-0839

SummaryThe time dependence of reaggregation of sodium alginate (SA) after following the shear-induced deaggregation of the aggregates (‘egg-box’ like microgel structures) at filtering through neutral 0.20 μm filters has been found. The aggregation of SA in solution prior to filtering was induced by addition 0.1 mM Ca2+ ions. For SA at concentration of 1mg/ml and room temperature, the reaggregation process is finished after four minutes from the end of the filtration of 3.5 cm3 of the solution with rate of filtration of 1 cm3/min. The reaggregation phenomenon is simply explained by diffusional driven processes of calcium ion – SA electrostatic interactions.