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Small Struct. 2400055
Exceptionally Stable Cobalt Nanoclusters on Functionalized Graphene
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To improve reactivity and achieve a higher material efficiency, catalysts are often used in the form of clusters with nanometer dimensions, down to single atoms. Since the corresponding properties are highly structure-dependent, a suitable support is thus required to ensure cluster stability during operating conditions. Herein, an efficient method to stabilize cobalt nanoclusters on graphene grown on nickel substrates, exploiting the anchoring effect of nickel atoms incorporated in the carbon network is presented. The anchored nanoclusters are studied by in situ variable temperature scanning tunneling microscopy at different temperatures and upon gas exposure. Cluster stability upon annealing up to 200 degrees C and upon CO exposure at least up to 1 x 10(-6) mbar CO partial pressure is demonstrated. Moreover, the dimensions of the cobalt nanoclusters remain surprisingly small (<3 nm diameter) with a narrow size distribution. Density functional theory calculations demonstrate that the interplay between the low diffusion barrier on graphene on nickel and the strong anchoring effect of the nickel atoms leads to the increased stability and size selectivity of these clusters. This anchoring technique is expected to be applicable also to other cases, with clear advantages for transition metals that are usually difficult to stabilize.
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from our users
Adv. Mater. Interfaces 2024, 2400123
Tuning Transition Metal-Containing Molecular Magnets by On-Surface Polymerization
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Porphyrins are promising multifunctional units particularly interesting for the realization of molecular nanodevices. Their structural variety allows to create precursors suitable for the on-surface polymerization of porphyrin blocks. The corresponding increased stability and improved transport properties of the formed polymerized molecular nanostructures make them practically worthwhile. For the case of 2D porphyrin materials, the effect of polymerization on the magnetic properties of transition metal ions has not been reported yet. Therefore, details on the properties of an extended covalent nickel tetraphenylporphyrin network formed via Ullmann coupling on the Cu(111) surface are reported. By using photoelectron and absorption spectroscopies together with density functional theory calculations, it is systematically evolving how the functional properties of the Ni centers are changed within a polymerized molecular structure in comparison to single-molecule nickel tetraphenylporphyrin derivatives that build the 2D molecular network. A model that explains the differences in the electronic and magnetic properties observed for the Ni centers in both structures based on the additional rigidity characteristic of the molecular layer after polymerization is drawn
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Tribology International Volume 195, July 2024, 109639
Comparative study of dry high-temperature tribological performance of hydrogen-free and hydrogenated DLC films deposited by HiPIMS in DOMS mode
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Solid lubricants are crucial for industries operating at temperatures beyond 300 ºC, where liquid lubricants encounter limitations. Diamond-like carbon (DLC) films, known for exceptional solid lubrication and mechanical properties, need higher thermal stability for effective use in high-temperature applications. This study focuses on developing DLC films with the required thermal stability and solid lubricating properties. Hydrogen-free and hydrogenated DLC films were deposited utilizing deep oscillation magnetron sputtering (DOMS). Thermal characterizations revealed both films surpassed 500 ºC in thermal stability, rendering them suitable for high-temperature tribological applications. However, the hydrogenated DLC film exhibited superior solid lubricating properties, achieving an ultra-low friction coefficient below 0.05 at elevated temperatures, along with enhanced wear resistance, while effectively protecting its counterpart up to 500 ºC.
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Deliverables view all
WP2 - MGT2 - Pilot scheme for the management of a distributed research infrastructure offering harmonized, interoperable and integrated services
D2.7 - Second assessment of access provision
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WP2 aims at optimizing the implementation of all access-related activities leading to integration and interoperability of a single Interoperable Distributed Research Infrastructure for Nanoscience (IDRIN). Optimization of user access experience, effectiveness of usage of the infrastructure and scientific output are the ultimate goals. To this effect, a continuous monitoring scheme for a smooth and harmonized operation is being put in place. Careful monitoring of the user proposals wallow identifying the scientific trends in user needs. Scientific outcomes are monitored and analyzed, both in terms of scientific publication and scientific data made available. To this effect one of its tasks is the technical and operational continuous upgrade of the IDRIN to better serve an expanding user community and to set the basis of an evolutionary model for an advanced and sustainable distributed research infrastructure. Particularly, this deliverable originates from task 2.5 (Technical and scientific evolution of the IDRIN). It foresees the analysis of the use of the TA-VA infrastructure and its scientific outcome as a whole, identifying new user communities to be targeted and preparing the calls for additional providers. The collective effort of TA-VA WP leaders, as well as the TLNet, contributes to the evaluation the scientific use of the distributed installations, identifying capacity criticalities if any, and/or capturing new science opportunities to be supported by the offer to the nanoscience users. As a result, it is foreseen that the NEP catalogue undergoes periodical revisions giving an answer to both (i) identified unmet qualitative needs of users and (ii) quantitative needs resulting from oversubscription of the current capacity.
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WP18 - JA8 - Bridging academic and industrial research
D18.4 - Mid term report on outreach, awareness and engagement to industrial community
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This report is a deliverable of Task 18.2 dedicated to the outreach to industrial community as part of WP18 “Bridging academic and industrial research”. This report proposes a follow up of the activities that have been carried out in the framework of WP from M19 to M36. It follows a marketing and dissemination campaign that has started in April 2022, just after the outreach strategy report (D18.2) have been issued at M13 and the publication of the first outreach report at M36. It also follows This report includes the main objectives of the outreach activities, the activities that have been implemented so far and some guidelines about how to improve the future campaign and foster innovation. It will cover the different topics: - THE CONTEXT, OBJECTIVES, CURRENT KPI AND THE ONGOING MARKETING STRATEGY - THE FOLLOW UP ABOUT MARKETING, OUTREACH AND DISSEMINATION - GOOD PRACTISES AND NEXT STEPS FOR UPGRADED OUTREACH CAMPAIGN
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WP9 - Virtual Access
D9.3 - Integration of the second set of the VA offer
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This deliverable presents the second set of Virtual Access (VA) services integrated into the NEP infrastructure. These online services, all running on a virtual machine (4 CPUs, 16 GB RAM, 50 GB SDD, OS: Debian 11, SSL via Apache reverse proxy) hosted by the Karlsruhe Institute of Technology (KIT), were developed within the Work Package (WP) 16 and were designed to improve the data FAIRness and to facilitate the user experience on (meta)data generation, postprocessing or exploration. The services are authenticated upon the NEP Single Sign-On (SSO) system via Keycloak [14]. The usage is monitored by aggregating the Units of Access (UoA), which are established to be every single action made by a logged-in user on one of the services, and monitored: whenever a loggedin user performs an action, the service backend sends a REST request to the NEP backend including the service ID and increases the usage counter by 1 UoA. No information about the users is handled or stored by the services. The Keycloak token, used by the Single Sign-On, is the only piece of information needed to grant access to the service. The document consists of three sections describing one VA service each. For completeness, each section explicitly mentions the corresponding WP16 task in which the service was framed and the deliverable in which it was described, if applicable.
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Transnational Access Statistics
26 calls for access
888 proposals submitted
63% rate of acceptance
30% with Large Scale Facilities
12% with theory
12% with industry
~3 average users per proposal
63 countries applying
2690 lab sessions