Synthesis of Gold Nanoparticles Grafted with a Thermoresponsive Polymer by Surface-Induced Reversible-Addition-Fragmentation Chain-Transfer Polymerization

Raula, Janne; Shan, Junjun; Nuopponen, Markus; Niskanen, Antti; Jiang, Hua; Kauppinen, Esko I.; Tenhu, Heikki

doi:10.1021/la026872r

Cited by 290 publications

(257 citation statements)

References 39 publications

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“…Therefore, gold particles are fi rst coated with an initiator molecule to generate suitable polymerization moieties for the subsequent synthesis of the polymer brush from the surface. Surface-initiated living/controlled polymerizations, especially atom transfer radical polymerization (ATRP) [124] , reversible addition fragmentation chain transfer polymerization (RAFT) [128] , and ring-opening metathesis polymerization [129] , have enabled production of polymer brushes with predetermined molecular weights, narrow size distributions and controlled architectures [130,131] . In contrast to the former two grafting techniques, the " grafting from " approach leads to polymer brushes with high grafting densities, which infl uence the chemical and physical properties of the nanoparticles, especially the wettability properties.…”

Section: Polymer Brushesmentioning

confidence: 99%

“…In contrast to the former two grafting techniques, the " grafting from " approach leads to polymer brushes with high grafting densities, which infl uence the chemical and physical properties of the nanoparticles, especially the wettability properties. Several reports were published where various kinds of polymers such as poly(ethylene glycol) [132,133] , poly(styrene) [134,135] , poly(methacrylamides) [136,137] , poly(methacrylates), [123] poly(vinylpyridines) [129] are tethered by one end to gold nanoparticles by either " grafting to " [122,138] , the in-situ " grafting to " [12] or the " grafting from " [128] technique [82] .…”

Section: Polymer Brushesmentioning

confidence: 99%

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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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Section: Polymer Brushesmentioning

confidence: 99%

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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“…The ingredients in the liquid phase are the metal salt precursor, which is reduced to its metallic form by a reducing agent such as ethylene glycol (Silvert et al, 1996;Silvert et al, 1997;Carotenuto et al, 2000), sodium citrate (Kim et al, 2003;Raula et al, 2003), or sodium borohydrate (Hyning and Zukoski, 1998;Hyning et al, 2001). Previous review papers have discussed several mechanisms for the formation of the metallic particles by wet chemistry methods.…”

Section: Synthesis Of Hybrid Nanoactuatorsmentioning

confidence: 99%

“…Some of the methods developed ( Figure 6) include surface grafting by functionalizing the responsive polymers with thiol groups to promote adsorption on the surface, and surface initiated polymerization by previously treating the metallic nanoparticle surface with radical polymerization initiators (Kim et al, 2003;Raula et al, 2003). Previous reports have observed a strong interaction of molecules that contain chemical groups with N and O, such as PVP and the amide group in PNIPAM and PAAm, with noble metals: platinum Miyazaki and Nakano, 2000), gold (Sun and Xia, 2002) and silver (Silvert et al, 1996;Silvert et al, 1997;Kim et al, 2006).…”

Section: Synthesis Of Hybrid Nanoactuatorsmentioning

confidence: 99%

Environmentally responsive polymeric "intelligent" materials: the ideal components of non-mechanical valves that control flow in microfluidic systems

Morones‐Ramírez¹

2010

Braz. J. Chem. Eng.

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-Miniaturization and commercialization of integrated microfluidic systems has had great success with the development of a wide variety of techniques in microfabrication, since they allowed their construction at a low cost and by following simple step-series procedures. However, one of the major challenges in the design of microfluidic systems is to achieve control of flow and delivery of different chemical reagents. This feature is especially important when using microfluidic systems in the development of cell culture systems, the construction of labs on a chip and the fabrication and design of chemical microreactors. Spatiotemporal control of the microenvironment in microfluidic devices has been only partially achieved by incorporating actuator parts (mechanical and non-mechanical) within these devices; nevertheless, recently there has been enormous progress due to advances in the materials sciences, and the development of novel polymeric "intelligent" materials. These materials have proved to be excellent candidates in the construction of non-mechanical actuators in the form of environmentally responsive valves. These valves can more efficiently control flows because these "intelligent" materials are capable of undergoing conformational changes and phase transitions in response to different local or external environmental stimuli; allowing them to turn the valves from "on" to "off". In addition, these valves have very simple designs, and are easy and cheap to incorporate into microfluidic systems. Therefore, although there are many reviews that focus on the development and design of non-mechanical actuators, the following review proceeds to describe the exciting characteristics, potential uses and synthesis methods of the building blocks of the most recent and innovative non-mechanical valves, environmentally responsive polymeric "intelligent" materials. In addition, the last section of this review will focus on the synthesis of composite materials that are capable of responding to more than one type of stimulus, since these materials are believed to be the future components that will boost the development of microfluidic systems with spatiotemporal controlled microenvironments.

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“…In the 'grafting-from' technique, a dispersion of core nanoparticles is first coated with an initiator group [15][16][17][18][19][20][21]. Living polymerization is then carried out from these sites to form a dense end grafted brush like polymeric shell.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of gold core–polymer shell responsive particles

D’Souza-Mathew¹,

Cayre²,

Hunter³

et al. 2013

Journal of Colloid and Interface Science

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The free adsorption of an end-functionalised weak polybase, poly dimethylaminoethyl methacrylate (pDMAEMA), on the surface of colloidal gold nanoparticles (AuNPs) as a route to produce a responsive core-shell nanoparticle is explored here. Optimal conditions for the physisorption of the polymeric chains onto the colloidal nanoparticles are explored. A dense coverage is facilitated by rapidly mixing the well solvated pH responsive homopolymer, at low pH, into a relatively poor solvent environment, at higher pH, containing a stable dispersion of charge-stabilized gold nanoparticles. The rapid pH change causes the polymer chains to concurrently collapse and adsorb onto the gold nanoparticles. In order to achieve sterically stable, monodisperse and responsive core shell nanoparticles, a crucial factor is the pH difference of the systems prior to their mixing. Once adsorbed, end-functional thiol groups on the adsorbed polymer chains can form more permanent covalent attachments with the core particles. Dynamic light scattering coupled with mobility data of pH titration experiments show that the core-shell particles exhibit a responsive character consistent with the observed potentiometric titration data of the polymer.The same particles demonstrate reversible aggregation when cycled between pH extremes. This is confirmed by shifts in the SPR peak of the corresponding UV-Vis absorption profile. The ease and flexibility of this strategy for core-shell particle production, coupled with the stability and responsiveness of the product, make this a promising colloidal coating mechanism.

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Synthesis of Gold Nanoparticles Grafted with a Thermoresponsive Polymer by Surface-Induced Reversible-Addition-Fragmentation Chain-Transfer Polymerization

Cited by 290 publications

References 39 publications

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

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

Environmentally responsive polymeric "intelligent" materials: the ideal components of non-mechanical valves that control flow in microfluidic systems

Facile synthesis of gold core–polymer shell responsive particles

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