Core/Shell Gold Nanoparticles by Self‐Assembly and Crosslinking of Micellar, Block‐Copolymer Shells

Kang, Youngjong; Taton, T. Andrew

doi:10.1002/anie.200461119

Cited by 316 publications

(314 citation statements)

References 37 publications

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“…2b-e), which basically involved the functionalization of the B-NP surface by a hydrophobic ligand (2, Fig. 1b), followed by PSPAA self-assembly 6,25,26 . Ligand 2 cannot replace the hydrophilic ligand 1 on the surface of A-NPs, which was thus not encapsulated.…”

Section: Resultsmentioning

confidence: 99%

A systems approach towards the stoichiometry-controlled hetero-assembly of nanoparticles

et al. 2010

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A central theme in nanotechnology is to advance the fundamental understanding of nanoscale component assembly, thereby allowing rational structural design that may lead to materials with novel properties and functions. nanoparticles (nPs) are often regarded as 'artificial atoms', but their 'reactions' are not readily controllable. Here, we demonstrate a complete nanoreaction system whereby colloidal nPs are rationally assembled and purified. Two types of functionalized gold nPs (A and B) are bonded to give specific products AB, AB 2 , AB 3 and AB 4 . The stoichiometry control is realized by fine-tuning the charge repulsion among the B-nPs. The products are protected by a polymer, which allows their isolation in high purity. The integration of hetero-assembly, stoichiometry control, protection scheme and separation method may provide a scalable way to fabricate sophisticated nanostructures.

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Section: Resultsmentioning

confidence: 99%

A systems approach towards the stoichiometry-controlled hetero-assembly of nanoparticles

et al. 2010

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“…They can be fabricated either by physisorption of block copolymers [121] or by covalent attachment of polymer chains. For physisorption, block copolymers adsorb onto the particle with one block interacting strongly with the surface whilst the other block, weakly interacting, dangles freely in solution.…”

Section: Polymer Brushesmentioning

confidence: 99%

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

Chanana¹,

Liz‐Marzán²

2012

Nanophotonics

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An essential element in the synthesis of nanomaterials based on gold nanoparticles comprises the control over parameters such as size, shape and composition, due to their strong infl uence on the properties of the particles. However, it is the coating material which often plays the primary role in tuning the size, morphology, and even plasmon resonance wavelength or mode multiplicity, as well as colloidal stability and functional versatility, ultimately determining the physical, chemical, optical, electronic and catalytic properties of the nanoparticles. Therefore, it is utterly important to select the adequate wet chemistry synthetic approach with the most suitable coating material for the preparation of gold nanoparticles with the desired requirements. Within this context, this review is focused on describing various types of organic and inorganic coating materials for gold nanoparticles that may notably affect their optical properties by either directly infl uencing the synthesis procedure or by changing their chemical and physical properties upon post-synthetic modifi cations, such that they exhibit novel and useful optical properties.

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“…Unlike other polymer wrapping methods, the shell of the resulting nanostructures was very thick and completely isolated nanomaterials from outer environment. 29,31 These features are very useful for the biomedical applications (especially for drug delivery) of SWNTs. Extending our previous works, herein, we are going to investigate the encapsulation behavior of SWNTs at different water content.…”

Section: -26mentioning

confidence: 99%

“…We recently reported single-walled carbon nanotubes (SWNTs) and gold nanoparticles encapsulated within block copolymer micelles in aqueous media. [27][28][29][30] In this method, block copolymers spontaneously formed thick concentric shell structures around nanotube-or nanoparticle core when solvent was gradually exchanged from DMF to water. Unlike other polymer wrapping methods, the shell of the resulting nanostructures was very thick and completely isolated nanomaterials from outer environment.…”

mentioning

confidence: 99%

Effect of Water Content on Encapsulation of SWNTs and Hydrophobic Dyes within PS-b-PAA Block Copolymer Micelles

Kang

2008

Bulletin of the Korean Chemical Society

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Due to their unique structural, mechanical and electronic properties, carbon nanotubes have been of great interest for last couple decades.1 Numerous applications of carbon nanotubes have been investigated in various fields of science and technology.2-9 For example, carbon nanotubes have been investigated as a component of sensors, drug delivery vehicles and hyperthermic therapy agents.10-15 It is generally acknowledged that carbon nanotubes first have to be functionalized and solubilized in aqueous media for such applications. This was achieved not only by covalent attachment of long chain molecules, 13,16 but also by formation of micelles around carbon nanotubes. Block copolymer surfactants have played a particularly important role in solubilization of hydrophobic molecules and nanomaterials in aqueous media due to their large loading capacity, 17-20 and high structural stability. 21-26Various nanomaterials have been stabilized by block copolymer micelles. We recently reported single-walled carbon nanotubes (SWNTs) and gold nanoparticles encapsulated within block copolymer micelles in aqueous media. [27][28][29][30] In this method, block copolymers spontaneously formed thick concentric shell structures around nanotube-or nanoparticle core when solvent was gradually exchanged from DMF to water. Unlike other polymer wrapping methods, the shell of the resulting nanostructures was very thick and completely isolated nanomaterials from outer environment.29,31 These features are very useful for the biomedical applications (especially for drug delivery) of SWNTs. Extending our previous works, herein, we are going to investigate the encapsulation behavior of SWNTs at different water content. Furthermore, partitioning behavior of hydrophobic molecules between encapsulated SWNTs and solvents with different water content was also investigated. Results and DiscussionHighly asymmetric PS 159 -b-PAA 58 block copolymers have been used for encapsulating SWNTs. It is known that PS 159 -b-PAA 58 forms very uniform micelles around SWNTs. 27SWNTs encapsulated within PS 159 -b-PAA 58 block copolymers (SWNT@ PS 159 -b-PAA 58 ) have been prepared by the previously reported method.27 Since both nanotubes and PS 159 -b-PAA 58 block copolymers were not able to be directly solubilized in aqueous solvent, they were first co-suspended in DMF, and then H 2 O was gradually added under vigorous sonication. As increasing water content (wc), originally insoluble SWNTs/co-polymer mixtures gradually formed homogeneous dispersion, which implies the formation of block copolymer micelles around SWNTs. Partitioning behavior of SWNTs has been first investigated as a function of water content. As shown in Figure 1a, solubility of SWNTs varied with water content giving the maximum value at wc = 20%; it sharply increased until water content reached to 20%, and then exponentially decreased thereafter. Solubility change with water content can be explained with swelling/deswelling and morphological change of micelle. Our light scattering data show that mice...

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Core/Shell Gold Nanoparticles by Self‐Assembly and Crosslinking of Micellar, Block‐Copolymer Shells

Cited by 316 publications

References 37 publications

A systems approach towards the stoichiometry-controlled hetero-assembly of nanoparticles

A systems approach towards the stoichiometry-controlled hetero-assembly of nanoparticles

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

Effect of Water Content on Encapsulation of SWNTs and Hydrophobic Dyes within PS-b-PAA Block Copolymer Micelles

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