Generation of mixed metallic nanoparticles from immiscible metals by spark discharge

Tabrizi, Nooshin Salman; Xu, Qiang; Pers, N. M. van der; Schmidt‐Ott, A.

doi:10.1007/s11051-009-9603-4

Cited by 106 publications

(67 citation statements)

References 31 publications

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“…Due to the extremely fast quenching of the vapor, it is unique for mixing materials . Substantial progress in mixing on an atomic scale as well as a nanoscale on metals that are miscible (Tabrizi et al 2008b) and immiscible (Tabrizi et al 2008c) has recently been made and will be published shortly. These new possibilities of mixing on a nanoscale are of great interest, for example in preparing advanced catalysts.…”

Section: Spark-discharge Generatormentioning

confidence: 99%

Generation and Sizing of Particles for Aerosol-Based Nanotechnology

Biskos

Vons

Yurteri

et al. 2008

KONA

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Section: Spark-discharge Generatormentioning

confidence: 99%

Generation and Sizing of Particles for Aerosol-Based Nanotechnology

Biskos

Vons

Yurteri

et al. 2008

KONA

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“…A large number of researchers have paid much attention to bimetallic nanoparticles (BNPs) [14][15][16][17][18][19][20][21] due to their potential applications in modern science. Among these studies, BNPs with immiscible compositions at bulk state have been successfully alloyed.…”

Section: Introductionmentioning

confidence: 99%

Size‐, Shape‐ and Composition‐Dependent Alloying Ability of Bimetallic Nanoparticles

Xiong

Huang

et al. 2011

ChemPhysChem

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Based on the surface-area-difference model, the formation enthalpies and the formation Gibbs free energies of bimetallic nanoparticles are calculated by considering size and shape effects. Composition-critical size diagrams were graphed for bulk immiscible bimetallic nanoparticles with the developed model. The results reveal that both the formation enthalpy and formation Gibbs free energy decrease with the decrease of particle size. The effect of rising temperature is similar to the diminishing of particle size on reducing the formation Gibbs free energy. Contrary to the positive formation enthalpy of the bulk immiscible system, a negative formation enthalpy is obtained when the particles are smaller than a critical size. With the decrease of size, the alloying process first takes place in the dilute solute regions, then broadens to the dense solute regions and finally, particles with all compositions can be alloyed. The composition-critical size diagram is classified into three regions by the critical size curves with shape factors of 1 and 1.49, that is, the non-alloying region, alloying region and possible alloying region. The model predictions correspond well with experimental evidences and computer simulation results for Cu-Ag, Au-Ni, Ag-Pt and Au-Pt systems.

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“…We believe also that this method of using electrodes with mixed materials may be a stepping stone for the production of mixed metal nanoparticles that can have applications in catalysis and as chemical and biological sensors. 22,23 Future studies will concentrate on examining other electrode materials such as carbon, pure silver and other alloyed electrode materials. Measurements will also be performed using a longer sample to detector distance to extend the q range to lower values so that larger particles that may be present in the arc (intermediate between those seen with SAXS and the deposited particles imaged by SEM), can be detected and characterized.…”

Section: Resultsmentioning

confidence: 99%

Small angle x-ray scattering and electron microscopy of nanoparticles formed in an electrical arc

et al. 2013

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Small Angle X-ray Scattering has been used to characterize nanoparticles generated by electrical arcing between metallic (AgSnO2) electrodes. The particles are found to have diameters between 30 and 40 nm and display smooth surfaces suggesting that they are either in liquid form or have solidified from the liquid state. Particles collected around the electrodes were analyzed by Transmission Electron Microscopy and were seen to be much larger than those seen in the SAXS measurement, to be spherical in form and composed of silver metal with irregular tin oxide particles deposited on their surface. Mixed metal nanoparticles can have important practical applications and the use of mixed sintered electrodes may be a direct method for their production

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Generation of mixed metallic nanoparticles from immiscible metals by spark discharge

Cited by 106 publications

References 31 publications

Generation and Sizing of Particles for Aerosol-Based Nanotechnology

Generation and Sizing of Particles for Aerosol-Based Nanotechnology

Size‐, Shape‐ and Composition‐Dependent Alloying Ability of Bimetallic Nanoparticles

Small angle x-ray scattering and electron microscopy of nanoparticles formed in an electrical arc

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