Chemical Synthesis and Structural Characterization of Highly Disordered Ni Colloidal Nanoparticles

Winnischofer, Herbert; Rocha, Túlio C. R.; Nunes, Wallace C.; Socolovsky, L.M.; Knobel, M.; Zanchet, Daniela

doi:10.1021/nn700152w

Cited by 107 publications

(97 citation statements)

References 34 publications

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“…Since the Ni nanoparticles heated under N 2 did not show the presence of Ni(OH) 2 /NiO species, the XPS results indicate the possibility of adsorbed Ni 2+ (oleate) complex on the surface of these nanoparticles. The similar results in XPS analysis were also observed by Couto et al [51] and also by Zanchet and co-workers [52] for colloidal Ni synthesized via completely different routes. It is also interesting to note that there is an distinct increase in the Ni 2+ (oleate) complex species at 855 eV in Ni nanoparticles of R 5 (3.7 nm).…”

Section: Resultssupporting

confidence: 88%

Block copolymer mediated stabilization of sub-5 nm superparamagnetic nickel nanoparticles in an aqueous medium

et al. 2009

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The paper presents a facile method for decreasing the size of water dispersible Ni nanoparticles from 30 nm to 3 nm by the incorporation of a passivating surfactant combination of pluronic triblock copolymer and oleic acid into a wet chemical reduction synthesis. A detailed study revealed that the size of the Ni nanoparticles is critically governed not only by the concentration of the tri block copolymers but also dependent on the hydrophobic nature of the micelle-core formed. The synthesized Ni nanoparticles were thoroughly characterized by TEM, XRD, XPS and temperature and field dependent magnetic measurements along with a comprehensive FTIR analysis to predict a possible mechanism of formation. Mirkin and co-workers demonstrated the efficient and selective separation of His-tagged proteins using Ni-based nanorods with a diameter of about 300 nm [15]. Hyeon and co-workers have successfully proved that superparamagnetic Ni with NiO shells have a high affinity for poly histidine and can be utilized for separating and purifying His-tagged proteins from a multicomponent solution [16]. Introduction.Ni nanoparticles can be synthesised in both organic and aqueous media. The high temperature decomposition of nickel carbonyl compounds [17] or Ni(acac) 2 compounds [18] in the presence of oleylamine, tri octyl phosphine oxide (TOPO) and tri octyl phosphine (TOP) [19] are common organic routes. While these methods are capable of producing monodispersed Ni with sub 5 nm size range, partial oxidation on the surface of the particles occurs readily even with the use of more than one capping agent [19]. Furthermore, the complexity involved in the above synthetic procedures is quite evident, requiring many steps, higher temperature, inert atmosphere and the use of non-regular, toxic chemicals. Microemulsion based methods using mixtures of polar and non polar solvents have also

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Section: Resultssupporting

confidence: 88%

Block copolymer mediated stabilization of sub-5 nm superparamagnetic nickel nanoparticles in an aqueous medium

et al. 2009

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“…12A) were obtained by reducing Ni(CH 3 COO) 2 with phosphine in phenylether and tuning the composition of a complicated surfactant system containing OA, alkyl amines and phosphines. 89 The kinetic diameters of amines and phosphines are the key parameters in controlling the particle size. The growth of the nanocrystals depends on the adsorption of these ions and the ligands with larger carbonic tails provide a steric hindrance, favoring the formation of smaller nanoparticles.…”

Section: Size and Shape Controlmentioning

confidence: 99%

Morphology-dependent nanocatalysis: metal particles

2011

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The rapid development of materials science now enables tailoring of metal and metal oxide particles with tunable size and shape at the nanometre level. As a result, nanocatalysis is undergoing an explosive growth, and it has been seen that the size and shape of a catalyst particle tremendously affects the reaction performance. The size effect of metal nanoparticles has been interpreted in terms of the variation in geometric and electronic properties that governs the adsorption and activation of the reactants as well as the desorption of the products. At the same time, it has been verified that the morphology of a catalyst particle, determined by the exposed crystal planes, also considerably affects the catalytic behavior. This is termed as morphology-dependent nanocatalysis: a catalyst particle with an anisotropic shape alters the reaction performance by selectively exposing specific crystal facets. This perspective article initially surveys the recent progress on morphology-dependent nanocatalysis of precious metal particles to emphasise the chemical nature of the morphology effect. Then, the fabrication of transition metal particles with controllable size/morphology is examined, and their shape is correlated with their catalytic properties, with the aim to clarify the structure-reactivity relationship. Finally, the future outlook presents our personal perspectives on the concept of morphology-dependent nanocatalysis of metal particles, which is a rapidly growing topic in heterogeneous catalysis.

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“…nischofer's groups [42,43]. We again demonstrated that the Ni(0) surface composition was dominated by adsorbed Ni 2+ -[AMMIM][Br]/[AcO] complexes in the present system which devoted to the high stability of the two nanocatalysts towards bulk oxidation and aggregation during the reaction.…”

Section: Properties Of Ni Catalystsmentioning

confidence: 51%

Catalytic hydrogenation of aromatic nitro compounds by functionalized ionic liquids-stabilized nickel nanoparticles in aqueous phase: The influence of anions

Zhao

et al. 2010

Sci. China Chem.

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Two kinds of nickel nanoparticles (NPs) well-dispersed in aqueous phase have been conveniently prepared by reducing nickel(II) salt with hydrazine in the presence of amino group (NH 2 ) functionalized ionic liquids:The Ni(0) particles are composed of smaller ones which assemble in a blackberry-like shape. The Ni nanoparticles stabilized with [AMMIM][AcO] are much larger than those stabilized with [AMMIM] [Br], and the former unexpectedly give much higher activity in the selective hydrogenation of citral and nitrobenzene (NB) in aqueous phase. The Ni(0) nanocatalysts dispersed in aqueous phase are stable enough to be reused at least five times without significant loss of catalytic activity and selectivity during the catalytic recycles. functionalized ionic liquid, nickel nanoparticles, aqueous phase, selective hydrogenation

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Chemical Synthesis and Structural Characterization of Highly Disordered Ni Colloidal Nanoparticles

Cited by 107 publications

References 34 publications

Block copolymer mediated stabilization of sub-5 nm superparamagnetic nickel nanoparticles in an aqueous medium

Block copolymer mediated stabilization of sub-5 nm superparamagnetic nickel nanoparticles in an aqueous medium

Morphology-dependent nanocatalysis: metal particles

Catalytic hydrogenation of aromatic nitro compounds by functionalized ionic liquids-stabilized nickel nanoparticles in aqueous phase: The influence of anions

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