TY - JOUR
T1 - Environment-sensitive stabilisation of silver nanoparticles in aqueous solutions
AU - Voets, Ilja K.
AU - de Keizer, Arie
AU - Frederik, Peter M.
AU - Jellema, Reint
AU - Cohen Stuart, Martien A.
PY - 2009/11/15
Y1 - 2009/11/15
N2 - We describe the preparation and characterisation of inorganic-organic hybrid block copolymer silver nanoparticles via the preparation of spherical multi-responsive polymeric micelles of poly(N-methyl-2-vinyl pyridinium iodide)-block-poly(ethylene oxide), P2MVP38-b-PEO211 and poly(acrylic acid)-block-poly(isopropyl acrylamide), PAA55-b-PNIPAAm88 in the presence of AgNO3. Hence, the P2MVP and PAA segments were employed to fix Ag+ ions within the micellar core (25 °C) or shell (60 °C), while the PEO segments ensured spontaneous reduction of Ag+ ions into metallic Ag, as well as colloidal stabilisation. Spherical and elongated composite core-shell(-corona) nanoparticles (CNPs) were formed containing several small, spherical silver nanoparticles within the micellar core or shell. As the co-assembly of the oppositely charged copolymers into micelles is electrostatically driven, the CNPs can be destabilised by, for example, addition of simple salts, i.e., the CNPs are stimuli responsive. CNP size and morphology control can be achieved via the preparation protocol. For example, heating to 60 °C, i.e., above the PNIPAAm LCST, results in core-shell-corona CNPs with the Ag-NPs situated in the aggregate shell.
AB - We describe the preparation and characterisation of inorganic-organic hybrid block copolymer silver nanoparticles via the preparation of spherical multi-responsive polymeric micelles of poly(N-methyl-2-vinyl pyridinium iodide)-block-poly(ethylene oxide), P2MVP38-b-PEO211 and poly(acrylic acid)-block-poly(isopropyl acrylamide), PAA55-b-PNIPAAm88 in the presence of AgNO3. Hence, the P2MVP and PAA segments were employed to fix Ag+ ions within the micellar core (25 °C) or shell (60 °C), while the PEO segments ensured spontaneous reduction of Ag+ ions into metallic Ag, as well as colloidal stabilisation. Spherical and elongated composite core-shell(-corona) nanoparticles (CNPs) were formed containing several small, spherical silver nanoparticles within the micellar core or shell. As the co-assembly of the oppositely charged copolymers into micelles is electrostatically driven, the CNPs can be destabilised by, for example, addition of simple salts, i.e., the CNPs are stimuli responsive. CNP size and morphology control can be achieved via the preparation protocol. For example, heating to 60 °C, i.e., above the PNIPAAm LCST, results in core-shell-corona CNPs with the Ag-NPs situated in the aggregate shell.
KW - Complex coacervation
KW - Micelle
KW - Nanoparticle
KW - Polyion complex
KW - Polymer
KW - Silver
UR - http://www.scopus.com/inward/record.url?scp=70349402932&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2009.07.065
DO - 10.1016/j.jcis.2009.07.065
M3 - Article
C2 - 19716564
AN - SCOPUS:70349402932
SN - 0021-9797
VL - 339
SP - 317
EP - 324
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
IS - 2
ER -