Catalytic properties of carboxylic acid functionalized-polymer microsphere-stabilized gold metallic colloids

Liu, Wei; Yang, Xinlin; Huang, Wenqiang

doi:10.1016/j.jcis.2006.08.040

Cited by 98 publications

(72 citation statements)

References 37 publications

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“…It is a suitable choice of amino groups as stabilizers for metallic nanoparticles due to its complexing interaction between the nitrogen atom in amino groups with metallic atoms [39,40]. Consequently, the gold nanocolloids were uniformly deposited onto the surface of P(DVB-co-GMA)-NH 2 microspheres with hydrophilic surface (GMA fraction of 0.60 in the comonomer feed as an example) by the in situ reduction of HAuCl 4 with NaBH 4 as reductant via the stabilization of the amino groups.…”

Section: P(dvb-co-gma)-nh 2 Stabilized Gold Nanocolloidsmentioning

confidence: 99%

Preparation of polymer microspheres with reactive epoxy group and amino groups as stabilizers for gold nanocolloids with recoverable catalysis

et al. 2014

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Narrow disperse poly(divinylbenzene-co-glycidyl methacrylate) (P(DVB-co-GMA)) microspheres with reactive epoxy group were prepared by distillation precipitation copolymerization of divinylbenzene (DVB) and glycidyl methacrylate (GMA) with benzoyl peroxide (BPO) as initiator in neat acetonitrile. The epoxy group was modified with ethylenediamine (EDA) for transferring to amino group, which was used as a stabilizer for the gold metallic nanocolloids during the in situ reduction of gold chloride trihydrate (HAuCl 4 ) with sodium borohydride (NaBH 4 ) as a reductant. The catalytic properties of the microspherestabilized gold nanocolloids (P(DVB-co-GMA)-NH 2 @Au) were investigated by the reduction of aqueous 4-nitrophenol (4-NP) to 4-aminophenol (4-AnP) with NaBH 4 as reductant. The resultant microspheres were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectra (FT-IR), elemental analysis (EA), Zeta potential, X-ray photoelectron spectroscopy (XPS), inductively coupled plasma (ICP) mission spectrum, and ultraviolet-visible spectroscopy.

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Section: P(dvb-co-gma)-nh 2 Stabilized Gold Nanocolloidsmentioning

confidence: 99%

Preparation of polymer microspheres with reactive epoxy group and amino groups as stabilizers for gold nanocolloids with recoverable catalysis

et al. 2014

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“…An induction time t 0 , i.e., a delay, was found for the 4-NP reduction in many cases [8, 9, 61, 63-65, 67, 70-74] although some authors reported no such delay [75][76][77][78]. Th e induction time has been observed with various catalysts, including Pd-Ag dendrite [8], Ag NPs immobilized in core-shell microgel [64], Ag NPs immobilized onto the highly branched polymer brush [72], Pt NPs immobilized onto the spherical polyelectrolyte brush (SPB) [61], chitosan-stabilized Pd NPs [73], and Cu DENs [74].…”

Section: Induction Time (T 0 )mentioning

confidence: 99%

“…[78,91,[97][98][99] Several papers reported Au NPs supported on polymer microspheres [78,91,[97][98][99]. Liu et al [78] found that the catalytic activity of microspherestabilized Au nanocolloids decreased gradually aft er each reaction cycle due to coagulation. However, an amount of supported catalyst could be quantitatively recycled during the recovery of the catalyst.…”

Section: Alumina Supportedmentioning

confidence: 99%

“…Furthermore, their large-scale application is hindered by a reduction in catalytic activity due to particle aggregation. To overcome these disadvantages, metal nanocomposite catalysts have been immobilized onto solid supports such as inorganic oxide [89,90,93,100,106,109,110], ion exchange resins [70,71,87], alumina [88,108], titania [11], polymer microspheres [78,91,[97][98][99], polystyrene [5,72,76,77,79,92,96,104,105], nanotubes [103], carbon spheres [101,102], and biomolecule beads [58]. Th ese supports must not take part in the catalytic mechanism, i.e., they must be inert.…”

Section: Introductionmentioning

confidence: 99%

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Reduction of 4‐Nitrophenol as a Model Reaction for Nanocatalysis

Noh¹,

Meijboom²

2014

Application of Nanotechnology in Water Research

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“…Furthermore, combining hydrogels with inorganic materials is a promising modification method of polymeric materials. In recent years, gold nanoparticles (Au NPs) have captured the considerable attention of both primitive and modern science due to their size-dependent optical, electrical and other properties [14][15][16][17]. Au NPs with size larger than 2 nm exhibit size-and shape-dependent surface plasmon absorption band; in comparison, Au NPs smaller than 2 nm exhibit photoinduced emission [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

A simple strategy to fabricate poly (acrylamide-co-alginate)/gold nanocomposites for inactivation of bacteria

et al. 2014

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A facile and efficient approach to prepare uniform gold nanoparticles (Au NPs) in hybrid hydrogel consisting of acrylamide (AM) and alginate (SA) for antibacterial applications is reported. In this study, reduction of gold ions by acrylamide and alginate (AM-SA) occurred before the polymerization and as-obtained gold colloids are stabilized by AM-SA immediately in the absence of commonly used reducing agents and protective reagents. Via transmittance electron microscopy results, we can conclude that the obtained gold nanoparticles in hydrogel are well dispersed. Furthermore, ultraviolet-visible absorption spectroscopy, Fourier transform infrared and thermogravimetric analysis were used to characterize the structure and composition of the synthetic nanocomposites. Our approach provides well-dispersed nanoparticles around 8 mm in size. It is important to underline that nanoparticle aggregation was not observed during and after gel formation. The prepared Au NPs exhibited remarkable stability in the presence of high pH s, and a range of salt concentrations. Importantly, the hydrogel/gold nanocomposites showed a non-compromised activity to inhibit the growth of a model bacterium, Escherichia coli. With their excellent mechanical behavior, as well as the remained antibacterial activity, the nanocomposites should get various potential applications in the fields of pharmaceutical science and tissue engineering.

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Catalytic properties of carboxylic acid functionalized-polymer microsphere-stabilized gold metallic colloids

Cited by 98 publications

References 37 publications

Preparation of polymer microspheres with reactive epoxy group and amino groups as stabilizers for gold nanocolloids with recoverable catalysis

Preparation of polymer microspheres with reactive epoxy group and amino groups as stabilizers for gold nanocolloids with recoverable catalysis

Reduction of 4‐Nitrophenol as a Model Reaction for Nanocatalysis

A simple strategy to fabricate poly (acrylamide-co-alginate)/gold nanocomposites for inactivation of bacteria

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