Is there an electron wind?

Marks, Laurence D.; Zhang, J. P.

doi:10.1016/0304-3991(92)90221-5

Cited by 17 publications

(6 citation statements)

References 4 publications

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“…This effect has been reported in several cases for particles weakly bound to their matrix, as in the case for gold nanoparticles on amorphous carbon films. Modeling of the momentum transfer between the electron beam and the supported particle has been reported …”

Section: Methodsmentioning

confidence: 99%

Catalytic Fe³⁺ Clusters and Complexes in Nafion Active in Photo-Fenton Processes. High-Resolution Electron Microscopy and Femtosecond Studies

et al. 2002

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This study presents the detailed nature of iron clusters formed on Fe 3+ -Nafion membranes. The catalytic nature of these clusters during immobilized Fenton processes was observed to be a function of the deposition method of Fe ions on the Nafion. The nonbiodegradable azo-dye Orange II and 2-propanol were utilized as convenient organic model compounds in photoassisted Fenton degradation processes. The highest photocatalytic activity was observed when samples were prepared by ion exchange between iron(III) aquacomplexes and H + or Na + as counterions of the Nafion SO3group. Spectroscopic techniques show that iron(III) in the membrane was present mainly as a mononuclear complex of [Fe(H2O)6] 3+ and binuclear complexes [Fe(H3O2)Fe] 5+ and [Fe-O-Fe] 4+ . If NaOH or ammonia was added to the former samples prepared by ion exchange, Nafion-Fe membranes with low photocatalytic activity were obtained showing R-Fe2O3 and [Fe-O-Fe] 4+ . Detailed high-resolution transmission electron microscopy was carried out for the Nafion-Fe ion-exchanged and also base-treated membranes showing R-Fe2O3 nanocrystallites of 3.5-5 nm. Spectral bands were found for iron oxides in the Fe 3+ -Nafion by femtosecond laser spectroscopy. The R-Fe2O3 nanocrystallites in the Nafion exchanged base-treated membranes presented a relaxation dynamics for the excited states close to that observed with R-Fe2O3 nanocrystallite colloids taken as reference compounds. Multiexponential transient absorption decay of R-Fe2O3 in SO3 --water clusters was observed with time constants close to 320 fs, 1.5 ps, and 31 ps after the excitation pulse. Samples of Fe 3+ -Nafion membranes with high activity show different transient dynamics relative to the Fe 3+ -Nafion with low activity. Correlation of the photocatalytic activity of Fe 3+ -Nafion with UV-vis, Fourier transform infrared, Mo ¨ssbauer, and X-ray photoelectron spectroscopic results suggests that the photocatalytic activity correlates with the amount of mononuclear [Fe(H2O)6 ] 3+ , binuclear complexes [Fe(H3O2)Fe] 5+ and oxo-bridged [Fe-O-Fe] 4+ found in the membranes.

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Section: Methodsmentioning

confidence: 99%

Catalytic Fe³⁺ Clusters and Complexes in Nafion Active in Photo-Fenton Processes. High-Resolution Electron Microscopy and Femtosecond Studies

et al. 2002

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“…Alternative mechanisms for nanoparticle movement under the electron beam include dielectric forces due to specimen charging via secondary electron generation, either directly or through surface or bulk plasmon decay, , direct momentum transfer due to electron diffraction, or thermal diffusion caused by local heating . None of these phenomena would produce the observed range of behavior.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

Plasmonic Nanobilliards: Controlling Nanoparticle Movement Using Forces Induced by Swift Electrons

et al. 2011

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Manipulation of nanoscale objects to build useful structures requires a detailed understanding and control of forces that guide nanoscale motion. We report here observation of electromagnetic forces in groups of nanoscale metal particles, derived from the plasmonic response to the passage of a swift electron beam. At moderate impact parameters, the forces are attractive, toward the electron beam, in agreement with simple image charge arguments. For smaller impact parameters, however, the forces are repulsive, driving the nanoparticle away from the passing electron. Particle pairs are most often pulled together by coupled plasmon modes having bonding symmetry. However, placement of the electron beam between a particle pair pushes the two particles apart by exciting antibonding plasmonic modes. We suggest how the repulsive force could be used to create a nanometer-sized trap for moving and orienting molecular-sized objects.

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“…It noteworthy that the coalescence seems to be reached after the reorientation of the {111} and {100} planes of the NPs which is attributed to an “electron wind” . This reorientation is evident in the smaller nanoparticles.…”

Section: Resultsmentioning

confidence: 95%

“…It is worth to mention at this point that the coalescence seems to be reached after the reorientation of the {111} and {100} planes of the NPs, which is attributed to an "electron wind". 25 This reorientation is evident in the smaller nanoparticles. Even more, the nanoparticles' displacements can be as large as their sizes.…”

Section: Page 6 Of 29 Acs Paragon Plus Environmentmentioning

confidence: 90%

Radiation Damage Mechanisms of Monolayer-Protected Nanoparticles via TEM Analysis

2017

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In this work it is shown that thiol-protected Au nanoparticles (AuNPs@SR) of approximately 3.4 nm in size suffered unexpectedly high radiation damage under standard transmission electron microscopy (TEM) operating conditions. For metallic systems (conducting sample) it is expected that the greatest contribution to the damage to come from knock-on displacement, but radiolysis is the most probable radiation damage mechanism for organic samples. The radiation damage of the electron beam produce huge changes in AuNPs' structure, leading to coalescence of the Au cores when their {100} surface are facing each other. The complete coalescence process involve thiol desoprtion, AuNPs' reorientation and surface diffusion of Au adatoms, which produce the oriented attachment of the Au cores. The knock-on displacement cannot explain by itself the time taken by the entire process. Through a rigorous analysis we rationalize the results

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Is there an electron wind?

Cited by 17 publications

References 4 publications

Catalytic Fe³⁺ Clusters and Complexes in Nafion Active in Photo-Fenton Processes. High-Resolution Electron Microscopy and Femtosecond Studies

Catalytic Fe³⁺ Clusters and Complexes in Nafion Active in Photo-Fenton Processes. High-Resolution Electron Microscopy and Femtosecond Studies

Plasmonic Nanobilliards: Controlling Nanoparticle Movement Using Forces Induced by Swift Electrons

Radiation Damage Mechanisms of Monolayer-Protected Nanoparticles via TEM Analysis

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Is there an electron wind?

Cited by 17 publications

References 4 publications

Catalytic Fe3+ Clusters and Complexes in Nafion Active in Photo-Fenton Processes. High-Resolution Electron Microscopy and Femtosecond Studies

Catalytic Fe3+ Clusters and Complexes in Nafion Active in Photo-Fenton Processes. High-Resolution Electron Microscopy and Femtosecond Studies

Plasmonic Nanobilliards: Controlling Nanoparticle Movement Using Forces Induced by Swift Electrons

Radiation Damage Mechanisms of Monolayer-Protected Nanoparticles via TEM Analysis

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Product

Resources

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Catalytic Fe³⁺ Clusters and Complexes in Nafion Active in Photo-Fenton Processes. High-Resolution Electron Microscopy and Femtosecond Studies

Catalytic Fe³⁺ Clusters and Complexes in Nafion Active in Photo-Fenton Processes. High-Resolution Electron Microscopy and Femtosecond Studies