EMAIL THIS PAGE TO A FRIEND

Langmuir : the ACS journal of surfaces and colloids

Reversible controlled assembly of thermosensitive polymer-coated gold nanoparticles.


PMID 21902271

Abstract

Aggregation of thermosensitive polymer-coated gold nanoparticles was performed in aqueous solution in the presence of a triblock copolymer poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (Pluronic P123, PEO(20)-PPO(68)-PEO(20)). The gold nanoparticles, AuNPs, which are covered by thermosensitive statistical copolymers poly(EO(x)-st-PO(y)), aggregate when the temperature is higher than the phase transition temperature of the polymer, leading to a macroscopic precipitation. The presence of Pluronic chains in solution prevents the uncontrolled aggregation of the AuNPs at higher temperature than both the aggregation temperature of the AuNPs (T(agg)) and the critical micellization temperature (cmt) of the Pluronic. The size, the colloidal stability, and the optical properties of the AuNPs aggregates are modulated as a function of the P123-to-AuNP ratio, which constitutes the critical parameter of the system. Moreover, the AuNP aggregation is totally reversible upon decreasing the temperature below T(agg). Our approach constitutes an easy way to the formation of well-controlled nanoparticle aggregates with well-defined sizes. The resulting aggregates have been characterized by UV-vis spectroscopy, dynamic light scattering, and electron microscopy.

Related Materials

Product #

Image

Description

Molecular Formula

Add to Cart

K4894
Kolliphor® P 188, solid
15759
Kolliphor® P 188
78973
Kolliphor® P 188 micro
62035
Kolliphor® P 407, oxyethylene 71.5-74.9 %
50246
Kolliphor® P 407 micro
P2443
Pluronic® F-127, powder, BioReagent, suitable for cell culture
P1300
Pluronic® F-68, solid, BioReagent, suitable for cell culture, suitable for insect cell culture
P5556
Poloxamer 188 solution, 10%, sterile-filtered, BioReagent, suitable for insect cell culture
16758
Poloxamer 407, purified, non-ionic
435406
Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol), average Mn ~1,100
435414
Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol), average Mn ~1,900
435422
Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol), average Mn ~2,000
435430
Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol), average Mn ~2,800
435449
Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol), average Mn ~2,900
435457
Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol), average Mn ~4,400
435465
Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol), average Mn ~5,800
412325
Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol), average Mn ~8,400
542342
Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol), average Mn ~14,600
435473
Poly(propylene glycol)-block-poly(ethylene glycol)-block-poly(propylene glycol), average Mn ~2,000
435481
Poly(propylene glycol)-block-poly(ethylene glycol)-block-poly(propylene glycol), average Mn ~2,700
435503
Poly(propylene glycol)-block-poly(ethylene glycol)-block-poly(propylene glycol), average Mn ~3,300
07579
Synperonic® F 108, surfactant, non-ionic
86216
Synperonic® PE P105, surfactant
713538
Synperonic® PE/P84