378 research outputs found
Finite Element Analysis-Based Soft Robotic Modeling: Simulating a Soft Actuator in SOFA
No full textThis tutorial was validated during the first International Winter School on Smart Materials for Soft Robots, held 12-17 December 2021, at the University of Cambridge, U.K. We would like to thank the organizational team and participants of this event. This project was funded by Fonds Wetenschap-pelijk Onderzoek via the personal grants of Ellen Roels (Grant 1S84120N) and Seppe Terryn (Grant 1100416N); European Union (EU) FET Open RIA Project SHERO (Grant 828818); and euROBIN (Grant 101070596). The corre-sponding author is Pasquale Ferrentin
Variable Stiffness, Sensing, and Healing in FESTO's FinRay Gripper
No full textThis work has received funding from the European Union's Horizon 2020 research and innovation program under Marie Sklodowska-Curie Grant agreement 860108 as well as the SHINTO project, which is funded under the European Innovation Council program of the European Union with Grant agreement ID 101057960. The authors gratefully acknowledge the Fonds Wetenschappelijk Onderzoek for the personal grants of S. Terryn (1100416N) and J. Brancart (12E1123N). The first author would like to acknowledge the generous support and resources provided by Festo headquarters located in Esslingen, Germany, for the research stay that enabled most of this study to be conducted. In addition, the support of Rolf Mueller in the force measurement study and for providing the test setup for the endurance analysis is highly appreciated.This article has supplementary downloadable material available at https://doi.org/10.1109/MRA.2024.3358723
A dataset of high-resolution synchrotron x-ray photoelectron spectra of tarnished silver-copper surfaces before and after reduction with a remote helium plasma at atmospheric pressure
No full textAbstract: The data presented in this article are related to the measure- ments in the contribution titled: \u2018Tarnished silver-copper sur- faces reduction using remote helium plasma at atmospheric pressure studied by means of high-resolution synchrotron x-ray photoelectron microscopy\u2019 published in Corrosion Sci- ence. X-ray photoelectron spectra were collected from pure silver, sterling silver (92.5 w% Ag and 7.5 w% Cu) alloy and pure copper. These metals were artificially sulphidised. A remote helium plasma at atmospheric pressure was applied on the metallic and sulphidised state. Then the top layer of the 4 surface states were analysed at the NanoESCA beamline (Electron Spectroscopy for Chemical Analysis at the Nanoscale) at Elettra Sincrotrone Trieste. The instrument installed as an end station at the NanoESCA beamline of the Elettra storage ring combines an electrostatic Photo Electron Emission Microscope (PEEM) with a double-hemispherical (\u2018IDEA\u2019) analyser, allowing the collection of photoemission electron microscopy (PEEM) images, X-ray photo electron- energy-filtered images and XPS spectra. The NanoESCA beamline provides electromagnetic radiation with variable polarization (linear, circular) and energies up to 10 0 0 eV. Information for Cu3p, Cl2p, S2p, C1s and Ag3d were obtained by collecting spectra at 450 eV. The goal of the analyses was to determine how the plasma treatment changed the top layer of the metallic and sulphidised surface of pure silver, sterling silver and pure copper. This contribution focuses on the calibration of the collected XPS spectra, as well as the impact of the plasma treatment on the surface states
Tarnished silver-copper surfaces reduction using remote helium plasma at atmospheric pressure studied by means of high-resolution synchrotron x-ray photoelectron microscopy
No full textAbstract: Previous investigations suggested that sulphide layers on pure silver surfaces were easily removed with a reducing plasma afterglow at atmospheric pressure, but were harder to remove on silver-copper alloys. In this study we investigated by synchrotron x-ray photoelectron spectroscopy the effect of plasma afterglow on tarnished pure silver, pure copper and sterling silver alloy. The results confirmed that plasma was able to reduce in depth all sulphides except Cu2S. The process was explained by standard reduction potentials and allowed to draw a detailed picture of the submicrometric evolution of the tarnished layers
Iron speciation in soda-lime-silica glass: a comparison of XANES and UV-vis-NIR spectroscopy
No full textScientific analyses of ancient glasses have been carried out for many years using elemental chemical analysis. However, it is known that the control of the redox conditions in the glass melt has a strong implication on the final hue of glass because it affects Fe2+/ΣFe. Therefore an increasing number of studies on the redox conditions have been published in recent years by means of synchrotron based X-ray absorption spectroscopy. This is a technique which is not easily accessible and requires dedicated facilities. In this paper we describe an alternative approach by means of optical absorption spectroscopy. We synthesised 10 soda-lime-silica glasses with known redox conditions and iron concentration to calibrate the absorption at 1100 nm as a function of Fe2+ concentration. The linear extinction coefficient was also determined. These glasses were also studied by means of X-ray Absorption Near Edge Structure (XANES) spectroscopy. Electron paramagnetic resonance spectroscopy was additionally used as an ancillary method to verify the quality of our data. Furthermore 28 samples from real archaeological samples were analysed by XANES and optical spectroscopy as a case study. The Fe2+/ΣFe values obtained were compared and demonstrated that the two techniques were in good agreement with each other. Optical spectroscopy can be applied in situ with moderate sample preparation to determine the concentration of Fe2+. To investigate the redox conditions, especially as a first screening approach, this methodology is an important tool to take into consideration before applying more sophisticated techniques such as XANES, which is more elaborate and requires high-tech resources
Deposition of aminosilane coatings on porous Al2O3 microspheres by means of dielectric barrier discharges
No full textAdvances in the synthesis of porous microspheres and in their functionalization are increasing the interest in applications of alumina. This paper deals with coatings plasma deposited from 3-aminopropyltriethoxysilane by means of dielectric barrier discharges on alumina porous microspheres, shaped by a vibrational droplet coagulation technique. Aims of the work are the functionalization of the particles with active amino groups, as well as the evaluation of their surface coverage and of the penetration of the coatings into their pores. A multi-diagnostic approach was used for the chemical/morphological characterization of the particles. It was found that 5min exposure to plasma discharges promotes the deposition of homogeneous coatings onto the microspheres and within their pores, down to 1μm
Mechanism of corrosion protection of hot dip aluminium-silicon coatings on steel studied by electrochemical depth profiling
No full textDepth profiling approach to evaluate the influence of hot stamping on the local electrochemical behaviour and galvanic series of hot-dip Al-Si coating on 22MnB5 steel
No full textThe influence of hot-stamping process on the corrosion properties of Al-Si coating on 22MnB5 steel was locally evaluated using a depth profiling approach combining GDOES and electrochemical micro cell. The results highlight the complexity of the system and the high dependence of the local galvanic series on the hot-stamping process. Due to iron diffusion from the steel substrate into the coating, the Al-rich layers presented active behaviour, whereas the initial coating condition showed a passive behaviour. Conversely, Fe/Si-rich sublayers acted as protective barrier for the steel substrate, as they show passive behaviour with nobler corrosion potentials and lower current densities
AUGER ELECTRON SPECTROMETRY OF POROUS LAYERS OF ANODIZED ALUMINIUM.
No full textDepth composition profiles of porous anodized aluminum at different stages of its growth have been obtained by Auger Electron Spectrometry in combination with ion etching. In order to study the growth of this layer, several oxide layers were prepared galvanostatically at different times in sulphuric and phosphoric acid. It has been found that the electrolyte is adsorbed and incorporated into the whole oxide layer during its growth, and that there is an important maximum of this amount incorporated during the transition from barrier to porous layer. (Author abstract. )SCOPUS: cp.pinfo:eu-repo/semantics/publishe
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