Thermal properties of nanoporous gold

Frenkel, Anatoly I.; Vasić, Relja; Dukesz, Bluma; Li, Diya; Chen, Mingwei; Zhang, Ling; Fujita, Takeshi

doi:10.1103/physrevb.85.195419

Cited by 25 publications

(15 citation statements)

References 51 publications

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“…31,32 For example, c-Al 2 O 3supported Pt particles of 1 nm average diameter demonstrated the following attributes: 1 . These findings demonstrate that the effects of substrate and adsorbates on the thermodynamic properties of metal nanoparticles are as important as the particle size, which has long been believed to be a dominant factor responsible for non-bulklike properties (e.g., decrease of lattice parameters of small clusters compared to the bulk, [137][138][139] or size-dependent changes in vibrational dynamics [139][140][141][142][143] ). These results 31 show that the effects of the size, support, and atmosphere on the structural (Fig.…”

Section: B Complex Interactions Between Catalysts Structure and Dynamentioning

confidence: 74%

Critical review: Effects of complex interactions on structure and dynamics of supported metal catalysts

Frenkel¹,

Cason²,

Elsen³

et al. 2013

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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This review article takes a new look at the problem of characterization of structural properties and reaction dynamics of supported metal catalysts. Such catalysts exhibit an inherent complexity, particularly due to interactions with the support and the adsorbate molecules, which can be highly sensitive to environmental conditions such as pressure and temperature. Recent reports demonstrate that finite size effects such as negative thermal expansion and large bond length disorder are directly caused by these complex interactions. To uncover the atomistic features underlying the reaction mechanisms and kinetics of metal catalysts, experimental characterization must accommodate the challenging operation conditions of catalytic processes and provide insights into system attributes. The combined application of x-ray absorption spectroscopy (XAS) and transmission electron microscopy (TEM) for this type of investigations will be examined, and the individual strengths and limitations of these methods will be discussed. Furthermore, spatial and temporal heterogeneities that describe real catalytic systems and can hinder their investigation by either averaging (such as XAS) or local (such as TEM) techniques alone will be addressed by conjoined, multiscale, ab initio density functional theory/molecular dynamics modeling of metal catalysts that can both support and guide experimental studies. When taken together, a new analysis scheme emerges, in which different forms of structure and dynamics can be fully characterized by combining information obtained experimentally by in situ XAS and electron microscopy as well as theoretically via modeling. V

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Section: B Complex Interactions Between Catalysts Structure and Dynamentioning

confidence: 74%

Critical review: Effects of complex interactions on structure and dynamics of supported metal catalysts

Frenkel¹,

Cason²,

Elsen³

et al. 2013

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

Self Cite

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“…The experimental data were nevertheless diverse and contradictory. For example, the earlier measurements have revealed the TEC values of NC materials to be substantially lower compared to the bulk counterparts .…”

Section: Introductionmentioning

confidence: 99%

Thermal expansion coefficient of carbon‐supported Pt nanoparticles: In‐situ X‐ray diffraction study

Leontyev

Kulbakov

Allix

et al. 2017

Physica Status Solidi (b)

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The thermal expansion of carbon‐supported Pt nanoparticles with different particle size has been studied in‐situ via X‐ray diffraction at temperatures from 100 to 300 K. The thermal expansion coefficient (TEC) of investigated Pt/C nanoparticles is always superior to that of bulk Pt. When the grain size D decreases from 11 to 3 nm, the TEC nonlinearly increases by about 1.66 × 10−6 K−1 which corresponds to a variation of ∼20% from bulk Pt. The obtained experimental dependence of TEC for Pt/C nanoparticles has been interpreted using different theoretical approaches. A comparison of the considered models with the experimental data reveals the best agreement from the binding order–length–strength model with the size dependence of TEC experimentally found in carbon‐supported Pt nanoparticles.

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“…In some cases, the changes in the bond lengths in response to the external perturbation can be measured with much higher accuracy than in the previous method, where actual bond lengths were measured and then subtracted from each other. External perturbations can be introduced by the difference in the ex situ treatment conditions [36] or by in situ modulation of reactive gas composition [34,37], electric [38], or magnetic field [39]. In this method, the strain is defined as ΔR, the bond length change between the two structures that underwent different treatments.…”

Section: Direct Measurement Of Deformation (δR) Via Differential Exafsmentioning

confidence: 99%

Two views at strained nanocrystals from the opposite sides of spatial resolution limit

Frenkel

2015

Phys. Scr.

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Thermal properties of nanoporous gold

Cited by 25 publications

References 51 publications

Critical review: Effects of complex interactions on structure and dynamics of supported metal catalysts

Critical review: Effects of complex interactions on structure and dynamics of supported metal catalysts

Thermal expansion coefficient of carbon‐supported Pt nanoparticles: In‐situ X‐ray diffraction study

Two views at strained nanocrystals from the opposite sides of spatial resolution limit

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