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Science 359, 1243-1246 (2018)
Real-time imaging of adatom-promoted graphene growth on nickel
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Single adatoms are expected to participate in many processes occurring at solid surfaces, such as the growth of graphene on metals. We demonstrate, both experimentally and theoretically, the catalytic role played by single metal adatoms during the technologically relevant process of graphene growth on nickel (Ni). The catalytic action of individual Ni atoms at the edges of a growing graphene flake was directly captured by scanning tunneling microscopy imaging at the millisecond time scale, while force field molecular dynamics and density functional theory calculations rationalize the experimental observations. Our results unveil the mechanism governing the activity of a single-atom catalyst at work.
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from our users
Separation Science and Technology (2017)
One step preparation of ZnFe2O4/Zn5(OH)6(CO3)2 nanocomposite with improved As(V) removal capacity
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Novel adsorbents consisting of ZnFe2O4/Zn5(OH)6(CO3)2 (hydrozincite) nanocomposite materials were studied for efficient As(V) removal from water. Nanocomposites were synthesized by the co-precipitation of Zn and Fe salts in alkaline conditions. Depending on the Zn/Fe molar ratio, a variety of materials was produced with different ZnFe2O4/Zn5(OH)6(CO3)2 contents. The adsorbent’s efficiency for As(V) removal was enhanced proportionally to the percentage of Zn5(OH)6(CO3)2 content. The nanocomposite with 74 ± 7 wt% of Zn5(OH)6(CO3)2 provided a capacity of 18.4 μg As(V)/mg for residual concentration of 10 μg/L (pH 7) which is over twice that of an iron oxy-hydroxide prepared under similar conditions.
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from our users
Chem. Sci., Advance Article (2018)
Are multiple Oxygen Species Selective in Ethylene Epoxidation on Silver?
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The nature of the oxygen species active in ethylene epoxidation is a long-standing question. While the structure of the oxygen species that participates in total oxidation (nucleophilic oxygen) is known the atomic structure of the selective species (electrophilic oxygen) is still debated. Here, we use both in situ and UHV X-ray Photoelectron Spectroscopy (XPS) to study the interaction of oxygen with a silver surface. We show experimental evidence that the unreconstructed adsorbed atomic oxygen (Oads) often argued to be active in epoxidation has a binding energy (BE) ≤ 528 eV, showing a core-level shift to lower BE with respect to the O-reconstructions, as previously predicted by DFT. Thus, contrary to the frequent assignment, adsorbed atomic oxygen cannot account for the electrophilic oxygen species with an O 1s BE of 530–531 eV, thought to be the active species in ethylene epoxidation. Moreover, we show that Oads is present at very low O-coverages during in situ XPS measurements and that it can be obtained at slightly higher coverages in UHV at low temperature. DFT calculations support that only low coverages of Oads are stable. The highly reactive species is titrated by background gases even at low temperature in UHV conditions. Our findings suggest that at least two different species could participate in the partial oxidation of ethylene on silver.
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Deliverables view all
WP11 - NA – Innovation and networking activities
D11.8 - Operational marketing plan towards industry
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Industrial innovation and knowledge transfer by exploiting the NFFA-Europe facilities are common objectives that the Technical and the Industrial Liaison Networks (TLNet/ILNet) set out jointly to achieve through six primary tasks in the 2017-2018 period. Two of these tasks answer back the actual needs of increasing both the industrial participation in the feasibility studies as well as the success rate in the number of granted access. The strategies enacted by NFFA-Europe in reaching out towards industry are described in the Operational Marketing Plan which is divided into two main sections.
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WP11 - NA – Innovation and networking activities
D11.12 - First Report on the incentivised knowledge transfer and feasibility work with industry
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This first report on the incentivised knowledge transfer and feasibility work with industry aims at describing the work carried out by the Technical Liaison Network to raise more awareness on the feasibility studies and on the next steps to upgrade the portal to harvest industrial requests. A survey on feasibility studies in the NFFA-Europe offer has highlighted a temporary under-exploitation of this tool by potential industrial users.
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WP11 - NA – Innovation and networking activities
D11.10 - Educational videos
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NFFA-Europe is a Research and Innovation Action committed to providing free access to state-of-the art tools for multidisciplinary, frontier research at the nanoscale: available techniques range from nano-characterisation to theory and numerical simulation. With the aim to enhance the knowledge in the nanoscale area for the European research community, this deliverable explains the action towards obtaining some educational materials freely available through the web-site. This material is based on the edition of a set of short-duration Educational Videos. The videos are being designed by expert scientists in the field and edited by Promoscience. Fifteen videos have been established to cover most of the NFFA-Europe techniques: 6 videos deal with lithography techniques, 2 videos deal with chemical and physical materials growth, 2 videos deal with theory and simulation techniques and finally 5 videos deal with characterization techniques at the nanoscale.
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Transnational Access Statistics
9 calls for access
301 proposals submitted
64% rate of acceptance
30% with Large Scale Facilities
12% with theory
11% with industry
~3 average users per proposal
40 countries applying
930 lab sessions