Electrochemistry at gold nanoparticles deposited on dendrimers assemblies adsorbed onto gold and platinum surfaces

Buriez, Olivier; Labbé, Éric; Zhang, Tian; Amatore, Christian

doi:10.1016/j.jelechem.2011.05.004

Cited by 9 publications

(8 citation statements)

References 54 publications

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“…different Co contents show nearly the same tendency. For this stage, the calculated elastic modulus of the WC-12Co cermet is about 446.5 GPa, which is very close to the experimental value of 475 GPa, measured for the nanocrystalline WC-12Co cermet (Wang et al, 2016). Stage II: strain is between 0.02 and the yield point, and the slope of the stress-strain curve gradually decreases.…”

Section: Figuresupporting

confidence: 81%

Distinguishing contributions of ceramic matrix and binder metal to the plasticity of nanocrystalline cermets

Liu

Hou

et al. 2020

IUCrJ

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Using the typical WC–Co cemented carbide as an example, the interactions of dislocations within the ceramic matrix and the binder metal, as well as the possible cooperation and competition between the matrix and binder during deformation of the nanocrystalline cermets, were studied by molecular dynamics simulations. It was found that at the same level of strain, the dislocations in Co have more complex configurations in the cermet with higher Co content. With loading, the ratio between mobile and sessile dislocations in Co becomes stable earlier in the high-Co cermet. The strain threshold for the nucleation of dislocations in WC increases with Co content. At the later stage of deformation, the growth rate of WC dislocation density increases more rapidly in the cermet with lower Co content, which exhibits an opposite tendency compared with Co dislocation density. The relative contribution of Co and WC to the plasticity of the cermet varies in the deformation process. With a low Co content, the density of WC dislocations becomes higher than that of Co dislocations at larger strains, indicating that WC may contribute more than Co to the plasticity of the nanocrystalline cermet at the final deformation stage. The findings in the present work will be applicable to a large variety of ceramic–metal composite materials.

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Section: Figuresupporting

confidence: 81%

Distinguishing contributions of ceramic matrix and binder metal to the plasticity of nanocrystalline cermets

Liu

Hou

et al. 2020

IUCrJ

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“…As the powder samples are slightly agglomerated, the aqueous dispersion facilitates the release of free nanoparticles that are transferred onto a solid substrate as thin films prior to AFM scanning [ 26 , 28 , 29 ]. AFM images of tailored nanostructures obtained via liquid dispersion of ferrite nanoparticles were previously reported [ 30 , 31 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

“…This behavior can be attributed to the well-known dependence of the H C on the sizes of the nanoparticles in the magnetic multidomain range. In this region, the size of the nanoparticles causes them to be composed of many magnetic domains which allow an easy domain wall motion and magnetization reversal, reducing the value of the coercive field by lowering the value of the domain wall energy [ 1 , 19 , 28 ]. The H C is a measure of the magneto-crystalline anisotropy of a sample.…”

Section: Resultsmentioning

confidence: 99%

Dependence of Structural, Morphological and Magnetic Properties of Manganese Ferrite on Ni-Mn Substitution

Dippong

Levei

Deac

et al. 2022

IJMS

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This paper presents the influence of Mn2+ substitution by Ni2+ on the structural, morphological and magnetic properties of Mn1−xNixFe2O4@SiO2 (x = 0, 0.25, 0.50, 0.75, 1.00) nanocomposites (NCs) obtained by a modified sol-gel method. The Fourier transform infrared spectra confirm the formation of a SiO2 matrix and ferrite, while the X-ray diffraction patterns show the presence of poorly crystalline ferrite at low annealing temperatures and highly crystalline mixed cubic spinel ferrite accompanied by secondary phases at high annealing temperatures. The lattice parameters gradually decrease, while the crystallite size, volume, and X-ray density of Mn1−xNixFe2O4@SiO2 NCs increase with increasing Ni content and follow Vegard’s law. The saturation magnetization, remanent magnetization, squareness, magnetic moment per formula unit, and anisotropy constant increase, while the coercivity decreases with increasing Ni content. These parameters are larger for the samples with the same chemical formula, annealed at higher temperatures. The NCs with high Ni content show superparamagnetic-like behavior, while the NCs with high Mn content display paramagnetic behavior.

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“…Another explanation could be that dendrimers of increasing generations block the electron transfer between Fc molecules and working electrode. This was observed for ferrocene‐modified gold nanoparticles deposited onto electrodes coated with PAMAM dendrimers …”

Section: Resultsmentioning

confidence: 69%

Polyamidoamine Dendrimers as Crosslinkers for Efficient Electron Transfer between Redox Probes onto Magnetic Nanoparticles

et al. 2018

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The efficient conjugation of ferrocenecarboxylic acid (Fc), a usual electroactive probe, onto COOH‐modified magnetic nanoparticles (NPs) is reported. Amine crosslinkers were used to couple COOH groups from NPs and from Fc. The coupling efficiencies using different generations of polyamidoamine (PAMAM) dendrimer and ethylenediamine (EDA) were compared through zeta potential measurements, square‐wave voltammetry (SWV) and NH2 titration. Highest PAMAM generations led to NH2‐modified NPs with increased zeta potential and NH2 density compared to lowest ones. Moreover, no aggregation was observed after crosslinker grafting. SWV was applied to characterize Fc‐modified NPs. PAMAM generations 0–3 improved the electrochemical signal in comparison to EDA. However, increasing PAMAM generations led to NPs aggregation. Quantitative results supported the fact that PAMAM generation 0 was the best compromise for large electrochemical signal without NPs aggregation.

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Electrochemistry at gold nanoparticles deposited on dendrimers assemblies adsorbed onto gold and platinum surfaces

Cited by 9 publications

References 54 publications

Distinguishing contributions of ceramic matrix and binder metal to the plasticity of nanocrystalline cermets

Distinguishing contributions of ceramic matrix and binder metal to the plasticity of nanocrystalline cermets

Dependence of Structural, Morphological and Magnetic Properties of Manganese Ferrite on Ni-Mn Substitution

Polyamidoamine Dendrimers as Crosslinkers for Efficient Electron Transfer between Redox Probes onto Magnetic Nanoparticles

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