Extremely Stable Water-Soluble Ag Nanoparticles

Doty, Chris; Tshikhudo, T. Robert; Brust, Mathias; Fernig, David G.

doi:10.1021/cm0508017

Cited by 253 publications

(168 citation statements)

References 55 publications

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“…In addition, the most commonly used stabilizers are thiol derivatives [25], ionic or neutral surfactants [26], alkylamines [27], or carboxylic compounds [17], therefore the alkyl chains and other functional groups of hydrogel matrix could be acting as stabilizers of Ag-NPs. A rearrangement of electronically excited molecules could be possible in photochemistry process; in the sense that they follow reaction pathways that are usually inaccessible in the ground state (activation barriers in the ground state are very high).…”

Section: Evidence Of the Reductant Role Of The Hydrogelsmentioning

confidence: 99%

Antibacterial polymeric nanocomposites synthesized by in-situ photoreduction of silver ions without additives inside biocompatible hydrogel matrices based on N-isopropylacrylamide and derivatives

Monerris¹,

Broglia²,

Yslas³

et al. 2017

Express Polym. Lett.

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Abstract. Synthesis of antibacterial nanocomposite obtained by in-situ photoreduction of Ag+ ions impregnated inside a biocompatible hydrogel matrix is described. Hydrogel matrixes based on N-isopropylacrylamide (PNIPAM) and copolymers are synthesized by free radical polymerization in aqueous medium. The hydrogels are loaded with Ag + ions and then silver nanoparticles (Ag-NPs) are obtained in-situ by application of UV light without using additives. Ag-NPs formation inside hydrogels is confirmed by UV-visible spectroscopy, scanning electronic microscopy (SEM) and transmission electronic microscopy (TEM). An extensive characterization of nanocomposites is performed by determining the partition coefficient of Ag + ions before photoreduction, the Ag-NPs mass loaded per gram of hydrogel as a function of irradiation time, swelling capacity and volume phase transition temperature. Fourier Transform Infrared (FTIR) spectra indicate the loss of some functional groups of the polymer backbone during reduction of Ag + ions whereas 13 C NMR spectra do not show any change in the main carbon chain. Nanocomposites show antibacterial activity against Pseudomonas aeruginosas by release of Ag + ions while Ag-NPs remain inside matrix. Reducing/stabilizing character of hydrogel and antibacterial activity of nanocomposite depend on the chemical composition of the matrix.

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Section: Evidence Of the Reductant Role Of The Hydrogelsmentioning

confidence: 99%

Antibacterial polymeric nanocomposites synthesized by in-situ photoreduction of silver ions without additives inside biocompatible hydrogel matrices based on N-isopropylacrylamide and derivatives

Monerris¹,

Broglia²,

Yslas³

et al. 2017

Express Polym. Lett.

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show abstract

“…Therefore, general pathways for pure metal functionalization may lead to unstable bonds that can be impaired through the input of thermal, chemical or electrical energy 221,222 . Pure metal nanoparticles have been successfully functionalized with thiols 204,223,224 , di-sulfides 200 , amines 223,[225][226][227] , nitriles, carboxylic acids and phosphines 225,226,228 . Selected examples will be presented in the following sections.…”

Section: Chemistry On Pure Metal Surfacesmentioning

confidence: 99%

“…Hydrophobic metal NPs and surfaces, stabilized with long alkyl ammonium ion chains, can be rendered hydrophilic through this process 227 . Although interactions between amino groups and metal NP surfaces are much weaker than those of thiol terminated compounds, large proteins and peptides were shown to link to silver NPs through both thiol and amine functionalities 223 .…”

Section: Amines and Ammonium Ionsmentioning

confidence: 99%

The fabrication and surface functionalization of porous metal frameworks – a review

Dumée

Bao

et al. 2013

J. Mater. Chem. A

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Porous metal frameworks offer potentially useful applications for the aerospace, automotive and bio-medical industries. They can be used as electrodes, actuators, or as selective membrane films. The versatility of the physical features (pore size, pore depth, overall porosity and pore surface coverage) as well as the large range of surface chemistries for both metal oxides and pure noble metals offers scope to functionalise metal nano-particles and networks of nano-porous metal structures. As well as traditional routes to producing metal structures, such as metal sintering or foaming, novel high-throughput techniques have recently been investigated. Nanoparticle self-assembly, metal ion reduction and deposition as well as metal alloy de-alloying were identified as sustainable routes to produce large surface areas of such nano-porous metal frameworks. The main limitations of the current fabrication techniques include the difficulty to process stable and homogeneous arrays of nano-scale pores and the control of their morphology due to the high reactivity of nano-structured metal structures. This paper aims at critically reviewing the various fabrication techniques and surface functionalization routes used to produce advanced functional porous metal frameworks. The limitations and advantages of the different fabrication techniques will be discussed in light of the final material properties and targeted applications. Keywordsporous metal frameworks; porous metal fabrication routes; metal surface chemistry; application of metal frameworks; 3

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“…2 Ag-dispersed polymers are highly preferred because the resulting nanocomposites can be used in catalysts, drugs and wound dressings, optical information storage, and surface-enhanced Raman scattering. [3][4][5] However, the formation of homogeneously dispersed Ag nanoparticles on a polymer matrix is difficult because the nanoparticles easily agglomerate. 6 Convenient and effective ways of preparing homogeneously dispersed Ag nanoparticles on polymer materials have yet to be established.…”

Section: Introductionmentioning

confidence: 99%

Homogeneously Dispersed Silver Nanoparticles on the Honeycomb-Patterned Poly(N-vinylcarbazole)-cellulose triacetate Composite Thin Films by the Photoreduction of Silver Nitrate

Kim¹,

Basavaraja²,

Huh³

2013

Bulletin of the Korean Chemical Society

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The photocontrolled reduction of silver nitrate to silver (Ag) nanoparticles on honeycomb-patterned poly(Nvinylcarbazole) (PVK)-cellulose triacetate (CTA) composite thin films was studied. The composites were prepared via the oxidative polymerization of N-vinylcarbazole with ferric chloride using different CTA concentrations. A honeycomb-patterned film was fabricated by casting the composite solution under humid conditions. Ag particles with a homogeneous distribution were produced by the composite film in a moderate CTA concentration, whereas aggregated Ag was obtained from the pure PVK film.

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Extremely Stable Water-Soluble Ag Nanoparticles

Cited by 253 publications

References 55 publications

Antibacterial polymeric nanocomposites synthesized by in-situ photoreduction of silver ions without additives inside biocompatible hydrogel matrices based on N-isopropylacrylamide and derivatives

Antibacterial polymeric nanocomposites synthesized by in-situ photoreduction of silver ions without additives inside biocompatible hydrogel matrices based on N-isopropylacrylamide and derivatives

The fabrication and surface functionalization of porous metal frameworks – a review

Homogeneously Dispersed Silver Nanoparticles on the Honeycomb-Patterned Poly(N-vinylcarbazole)-cellulose triacetate Composite Thin Films by the Photoreduction of Silver Nitrate

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