Double‐Faced Micelles from Water‐Soluble Polymers

Voets, Ilja K.; Keizer, A. de; Waard, Pieter de; Frederik, Peter M.; Bomans, Paul H. H.; Schmalz, Holger; Walther, Andreas; King, Stephen M.; Leermakers, F.A.M.; Stuart, Martien A. Cohen

doi:10.1002/anie.200601000

Cited by 188 publications

(148 citation statements)

References 28 publications

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“…Previously, it was established that polymer stock solutions prepared at a pD ∼ 7 result in a PMC at f + = 0.5 for the combination PDMAEMA/PAA [10], while the stock solutions should be prepared at pH ∼ 8 for the combination P2MVP/PAA [11][12][13]. Unless otherwise specified, all experiments were performed at room temperature.…”

Section: Sample Preparationmentioning

confidence: 99%

Towards a structural characterization of charge-driven polymer micelles

et al. 2009

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Abstract. Light scattering and small-angle neutron scattering experiments were performed on comicelles of several combinations of oppositely charged (block co)polymers in aqueous solutions. Fundamental differences between the internal structure of this novel type of micelle -termed complex coacervate core micelle (C3Ms), polyion complex (PIC) micelle, block ionomer complex (BIC), or interpolyelectrolyte complex (IPEC)-and its traditional counterpart, i.e., a micelle formed via self-assembly of polymeric amphiphiles, give rise to differences in scaling behaviour. Indeed, the observed dependencies of micellar size and aggregation number on corona block length, N corona, are inconsistent with scaling predictions developed for polymeric micelles in the star-like and crew-cut regime. Generic C3M characteristics, such as the relatively high core solvent fraction, the low core-corona interfacial tension, and the high solubility of the coronal chains, are causing the deviations. A recently proposed scaling theory for the cross-over regime, as well as a primitive first-order self-consistent field (SCF) theory for obligatory co-assembly, follow our data more closely.

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Section: Sample Preparationmentioning

confidence: 99%

Towards a structural characterization of charge-driven polymer micelles

et al. 2009

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“…Poly(N-methyl-2-vinyl pyridinium iodide)-block-poly(ethylene oxide), P2MVP 38 -b-PEO 211 (M w = 13 kg mol À1 ) has been synthesised by sequential anionic polymerisation [25,26] (polydispersity index, PDI $ 1.01), followed by quaternisation with methyl iodide (degree of quaternisation $89%). Poly(acrylic acid)-block-poly(isopropyl acrylamide), PAA 55 -b-PNIPAAm 88 (M w = 14 kg mol…”

Section: Methodsmentioning

confidence: 99%

Environment-sensitive stabilisation of silver nanoparticles in aqueous solutions

Voets¹,

Keizer²,

Frederik³

et al. 2009

Journal of Colloid and Interface Science

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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), P2MVP 38 -b-PEO 211 and poly(acrylic acid)-blockpoly(isopropyl acrylamide), PAA 55 -b-PNIPAAm 88 in the presence of AgNO 3 . 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.

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“…Cohen Stuart et al have created Janus micelles from two block polymers, poly(acrylic acid)-block-polyacrylamide and poly(2-methylvinylpyridinium iodide)-block-poly(ethylene oxide) by combining associative and segregative phase separation; the micelles are composed of poly(acrylic acid) and poly(2-methylvinylpyridinium iodide) coacervate cores with one coronal hemisphere of polyethylene oxide and the other of polyacrylamide. [125] To date, in our view, controlled microphase separation of block copolymers in a mesoscopic particulate space should be the only strategy, albeit difficult to implement, allowing us to produce particles with defined but varied mesostructured patterns on the surfaces in a large scale.…”

Section: Microphase Separationmentioning

confidence: 99%

Molecular Mimetic Self‐Assembly of Colloidal Particles

Mao

Wang

2010

Adv Funct Materials

132

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This article presents an overview of the current progress in molecular mimetic self‐assembly of colloidal particles. Firstly, the recent study of colloidal particles at interfaces is highlighted, underlining the mesoscopic mimicry of the surface activity of amphiphilic molecules using colloidal particles. Secondly, various strategies developed thus far to impart colloidal particles with anisotropy in terms of chemical composition, surface chemistry and particle morphology, which are regarded as mesoscopic atoms and molecules, are reviewed. Thirdly, an overview of the current theoretical and experimental results of using the rules of molecular synthesis and self‐assembly to direct self‐assembly of colloidal particles is presented. Finally, the experimental challenges associated with molecular mimetic self‐assembly of colloidal particles are outlined, giving a rather conservative conclusion of the status quo of this new research field with a very optimistic outlook.

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Double‐Faced Micelles from Water‐Soluble Polymers

Cited by 188 publications

References 28 publications

Towards a structural characterization of charge-driven polymer micelles

Towards a structural characterization of charge-driven polymer micelles

Environment-sensitive stabilisation of silver nanoparticles in aqueous solutions

Molecular Mimetic Self‐Assembly of Colloidal Particles

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