Preparation of Cu–Ni alloy nanocrystallites in water-in-oil microemulsions

Feng, Jian; Zhang, Chaoping

doi:10.1016/j.jcis.2005.06.071

Cited by 84 publications

(59 citation statements)

References 26 publications

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“…These results are further supported by the XRD results, which is used to characterize dimensions and structure of these nanomaterials. XRD patterns of Ag and Cu NPs 31 along with the diffraction peak due to (002) plane of MWCNT [ Figure 5 (inset)]. The lattice constant of Cu on Cu-CNT is found to be 3.614 Å, which is in good agreement with pure Cu crystals.…”

Section: Resultsmentioning

confidence: 62%

An efficient growth of silver and copper nanoparticles on multiwalled carbon nanotube with enhanced antimicrobial activity

2010

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Transition metal nanoparticles (NPs) such as silver (Ag) and copper (Cu) have been grafted onto carbon nanotube surface through wet chemical approach leading to the development of densely packed NP decorated carbon nanotubes. Chemically active surface and high-temperature stability are the basic attributes to use carbon nanotubes as the template for the growth of NPs. Ag NP-grafted carbon nanotubes (Ag-MWCNT) are prepared by complexing Ag ion with acid functionalized carbon nanotubes followed by the reduction method. Alternatively, Cu-grafted carbon nanotubes (Cu-MWCNT) are prepared by simple chemical reduction method. X-ray diffraction results reveal that the Ag or Cu NPs formed on the surface of carbon nanotubes are determined to be face centered cubic crystals. The morphology and chemical structure of NP-grafted carbon nanotubes are investigated using transmission electron spectroscopy, X-ray photoelectron spectroscopy and Raman spectroscopy. The antimicrobial properties of acid-treated MWCNT (MWCNT-COOH), Ag-MWCNT, and Cu-MWCNT are investigated against gram negative Escherichia coli bacteria. Ag-MWCNT and Cu-MWCNT (97% kill vs. 75% kill), whereas MWCNT-COOH only killed 20% of this bacteria. Possible mechanisms are proposed to explain the higher antimicrobial activity by NP-coated MWCNT. These findings suggest that Ag-MWCNT and Cu-MWCNT may be used as effective antimicrobial materials that find applications in biomedical devices and antibacterial controlling system.

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Section: Resultsmentioning

confidence: 62%

An efficient growth of silver and copper nanoparticles on multiwalled carbon nanotube with enhanced antimicrobial activity

2010

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“…In the case of almost similar reduction rates, a mixed nanoalloy is obtained. That is, the reduction potentials, i.e., the tendency of the salt to become reduced, are expected to be determinants for the final arrangement [67]. Irrespective of the synthesis route, the ideal technique must ensure controllability of the nanostructure, which turns out to be hardly achieved.…”

Section: Synthesis Of Bimetallic Nanoparticles In Microemulsionsmentioning

confidence: 99%

“…The reason is that, a priori, reduction of the two metals may take place simultaneously, but it is well-known that the higher reduction potential ions have the priority in reduction. As a consequence, it is expected that a large difference in the reduction potentials will lead to a core-shell structure, and a small difference results in a nanoalloy [67]. However one has to be careful when applying bulk ideas to compartmentalized media [73] because nanoparticle structure not only depends on the difference in reduction rates, but also on the microemulsion composition [72,74], reactant concentrations [75], and the proportion between reactants [75,76].…”

Section: Bimetallic Nanoparticles Obtained From Microemulsions Using mentioning

confidence: 99%

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On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions

2017

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A comparative study on different bimetallic nanocatalysts prepared from microemulsions using a one-pot method has been carried out. The analysis of experimental observations, complemented by simulation studies, provides detailed insight into the factors affecting nanoparticle architecture: (1) The metal segregation in a bimetallic nanocatalysts is the result of the combination of three main kinetic parameters: the reduction rate of metal precursors (related to reduction standard potentials), the material intermicellar exchange rate (determined by microemulsion composition), and the metal precursors concentration; (2) A minimum difference between the reduction standard potentials of the two metals of 0.20 V is needed to obtain a core-shell structure. For values ∆ε 0 smaller than 0.20 V the obtaining of alloys cannot be avoided, neither by changing the microemulsion nor by increasing metal concentration; (3) As a rule, the higher the film flexibility around the micelles, the higher the degree of mixture in the nanocatalyst; (4) A minimum concentration of metal precursors is required to get a core-shell structure. This minimum concentration depends on the microemulsion flexibility and on the difference in reduction rates.

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“…Verification of calculations by the synthesis of Cu-Ni nanoparticles in water-in-oil microemulsion [11] and characterization of products by DLS, ICP/OES, TEM, HRTEM, IR and DSC contribute to the description of thermal stability of nanoalloys of Cu-Ni system.…”

Section: Introductionmentioning

confidence: 99%

Cu–Ni nanoalloy phase diagram – Prediction and experiment

Sopoušek

Vřešťál

Pinkas

et al. 2014

Calphad

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited.

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Preparation of Cu–Ni alloy nanocrystallites in water-in-oil microemulsions

Cited by 84 publications

References 26 publications

An efficient growth of silver and copper nanoparticles on multiwalled carbon nanotube with enhanced antimicrobial activity

An efficient growth of silver and copper nanoparticles on multiwalled carbon nanotube with enhanced antimicrobial activity

On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions

Cu–Ni nanoalloy phase diagram – Prediction and experiment

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