Poly(ethyleneimine) as reducing and stabilizing agent for the formation of gold nanoparticles in w/o microemulsions

Note, Carine; Kosmella, Sabine; Koetz, Joachim

doi:10.1016/j.colsurfa.2006.05.018

Cited by 95 publications

(64 citation statements)

References 43 publications

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“…The polymer acts as stabilization agent since it easily absorbs at the magnetic nanoparticle surface, providing positively charged amino groups that stabilizes the particles by electrostatic repulsion. [28] The narrow distribution make them potentially candidates for magnetic hyperthermia, since the size and distribution has an important impact on the heating efficacy, then a small change in particles diameter provoke huge differences in SPA. MNPs with broad ranges of sizes have different saturation magnetization values and anisotropies reducing the maximum SPA.…”

Section: Resultsmentioning

confidence: 99%

Long‐Term Stability and Reproducibility of Magnetic Colloids Are Key Issues for Steady Values of Specific Power Absorption over Time

Sanz

Calatayud

Cassinelli³

et al. 2015

Eur J Inorg Chem

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Section: Resultsmentioning

confidence: 99%

Long‐Term Stability and Reproducibility of Magnetic Colloids Are Key Issues for Steady Values of Specific Power Absorption over Time

Sanz

Calatayud

Cassinelli³

et al. 2015

Eur J Inorg Chem

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“…[36] Nevertheless, recently there has been an increase in the use of polyelectrolytes as reducing agents and at the same time as stabilizers of metallic nanoparticles. [37][38][39] On the other hand, a crucial aspect on synthesis of nanomaterials is the stabilization to avoid coalescence; stabilization which avoids the aggregation or coagulation phenomena; stabilization can be carried out by steric or electrostatic effects. [40] An advantage of the ionic polymers or polyelectrolytes is that they can stabilize nanoparticles through both effects.…”

Section: Introductionmentioning

confidence: 99%

Polyelectrolytes with sulfonic acid groups useful in the synthesis and stabilization of Au and Ag nanoparticles

Herrera‐González

Caldera‐Villalobos

Garcı́a-Serrano

et al. 2016

Designed Monomers and Polymers

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Two novel polyelectrolytes were obtained by chemical modification of poly(4-acryloyloxybenzaldehyde) using o-and p-aminophenylsulfonic acid, the characterization shows a chemical modification of 24.38 and 63.33%, respectively. The study shows that the polyelectrolyte with sulfonic acid in para position reduces metal ions more rapidly than polyelectrolyte in ortho position. The obtained nanoparticles of Au and Ag were characterized by ultraviolet-visible absorption spectroscopy (UV-vis) and transmission electron microscopy. The results showed that these ionic polymers are not only capable of reducing gold and silver ions, but also can stabilize the nanoparticles in the colloidal solutions. With these polymers, the process of metallic ions reduction is very slow and they lead to the production of Au and Ag nanoparticles with quasi-spherical shapes which are stable in colloidal solutions for several months. The advantage of the method used here is that the reduction can be realized in water at room temperature.

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“…The BPEI is known to be not only a mild reducing agent often used in the synthesis of gold or silver nanoparticles [11], but also an excellent protective agent, for avoiding aggregation of nanoparticles [12]. Once the microstructure was in the HAuCl 4 solution at the elevated temperature, the AuCl − 4 precursors were reduced by the attached BPEI through a thermal process [13] and dispersed gold nanoparticles would form on the surface of the MAA-PTTA micrologs exclusively.…”

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confidence: 99%

Three-dimensional selective growth of nanoparticles on a polymer microstructure

Wu¹,

Han²,

Chen³

2009

Nanotechnology

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We demonstrate a new technique for selectively growing gold nanoparticles on a patterned three-dimensional (3D) polymer microstructure. The technique integrates 3D direct writing of heterogeneous microstructures with nanoparticle synthesis. A digital micromirror device is employed as a dynamic mask in the digital projection photopolymerization process to build the heterogeneous microstructure layer by layer. An amine-bearing polyelectrolyte, branched poly(ethylenimine), is selectively attached to the microstructure and acts as both a reducing and a protective agent in the nanoparticle synthesis. Scanning electron microscopy, energy dispersive x-ray spectroscopy and x-ray photoelectron spectroscopy are utilized to analyze the microstructure and the 3D selectivity of the nanoparticle growth.(Some figures in this article are in colour only in the electronic version) Nanomaterials and nanostructures have drawn much attention due to their unique electronic, optical and chemical properties. To date, significant efforts have been devoted to the synthesis of various nanostructures such as nanowires, nanotubes, nanoshells and nanotripods [1][2][3][4]. These nanostructures have an assortment of compositions and properties, and range from elemental to compound materials and from conductors to insulators. Despite the successes in controlling the size, shape, composition distribution and state of nanomaterials, technologies for the spatial manipulation, ordered distribution or selective localization are still lacking. These problems present a major hurdle to be overcome before the proven potential of nanostructures can be applied in real applications. Significant work includes the development of optical tweezers that can manipulate nanometer-sized dielectric particles in three dimensions, by Ashkin et al and Chu [5,6]. However, optical tweezers are limited as regards the number of nanoparticles that can be controlled for both motion and position at the same time. Different methods of aligning nanowires and nanotubes on substrates have also been demonstrated [7][8][9], but the ordering is only in two dimensions.To realize three-dimensional (3D), active, heterogeneous microsystems, it is imperative to control the nanostructures in the microdevice selectively in a 3D fashion. Current microfabrication and nanofabrication techniques such as photolithography and nanoimprinting are 2D in nature. Little work has been done on extending two-dimensional patterning to three dimensions. The capability of 3D localization of nanostructures will not only provide more functionalized area in a device, but also allow numerous 3D applications to be explored.In this work, we will demonstrate the selective growth of Au nanoparticles in a patterned 3D polymer microstructure. Using a multi-material digital projection photopolymerization (DPP) technique [10], we fabricate a heterogeneous polymer microstructure layer by layer. We then grow Au nanoparticles in selected areas of the polymer microstructure. Materials characterization is carried ...

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Poly(ethyleneimine) as reducing and stabilizing agent for the formation of gold nanoparticles in w/o microemulsions

Cited by 95 publications

References 43 publications

Long‐Term Stability and Reproducibility of Magnetic Colloids Are Key Issues for Steady Values of Specific Power Absorption over Time

Long‐Term Stability and Reproducibility of Magnetic Colloids Are Key Issues for Steady Values of Specific Power Absorption over Time

Polyelectrolytes with sulfonic acid groups useful in the synthesis and stabilization of Au and Ag nanoparticles

Three-dimensional selective growth of nanoparticles on a polymer microstructure

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