Why do my Alginate-Chitosan Nanoparticles form an aggregate within a day under gravity ?

I'm using 7.5 mL 18 mM CaCl2; 117.5 mL 0.063% Alginate; 25 mL chitosan 0.04%. I've tried it with 800 rpm and 13000 rpm; CaCl2 + Alginate (60 min); CaCl2-Alginate + Chitosan (90 min). It form an...

03 August 2015 3,327 7 View