Antisolvent-induced encapsulation for extraction/preconcentration of silver nanoparticles

In this research work a simple and very fast antisolvent-induced encapsulation procedure was developed and applied for extraction and preconcentration of silver nanoparticles from diluted aqueous solutions. Organic solvent (1. 0 ml) was added to a solution of silver nanoparticles capped with starch (2. 0 ml) for formation of a homogeneous solution. To the mixture solution، suitable amount of ammonium sulfate (0. 30 g) was added and the solution was vigorous shaken until the salt was completely dissolved. Then 1. 0 ml of organic antisolvent was added، after which it was separated into two clear phases by centrifugation at 3000 rpm for 5 min. The influences of effective parameters such as salt (type and amount)، organic solvent، and its volume were studied and optimized.