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Stabilization of Silver Nanoparticles by Polyelectrolytes and Poly(ethylene glycol)
Author(s) -
Radziuk Darya,
Skirtach Andre,
Sukhorukov Gleb,
Shchukin Dmitry,
Möhwald Helmuth
Publication year - 2007
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200600895
Subject(s) - silver nanoparticle , ethylene glycol , sodium borohydride , polyelectrolyte , silver nitrate , nanoparticle , aqueous solution , peg ratio , agglomerate , materials science , chemical engineering , polymer chemistry , salt (chemistry) , colloid , nuclear chemistry , chemistry , inorganic chemistry , organic chemistry , nanotechnology , polymer , finance , engineering , economics , composite material , catalysis
Silver nanoparticles of 23 nm size were formed by chemical reduction of silver nitrate in excess of aqueous sodium borohydride. To examine the aggregation behavior in NaCl solutions, they were coated with poly(diallyldimethylammonium chloride), poly(allylamine hydrochloride) and poly(ethylene glycol) by layer‐by‐layer assembly. Silver nanoparticles coated with PDADMAC of both high and low molecular weight revealed the lowest stability independent of salt concentration. Silver nanoparticles coated with PAH and PEG are stable in 0.1 or 0.01 M NaCl, whereas addition of 0.5 M NaCl destroys the colloidal solution. The destruction of silver agglomerates and the increase of monodispersity in the case of PEG coated silver nanoparticles were observed after heating at 90 °C. In contrast, uncoated silver nanoparticles readily agglomerate and precipitate even after heating at 65 °C.