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Postma, J.I. (author), Ferrari, A. (author), Bottger, A.J. (author)Surface compositions play a predominant role in the efficiency and lifetime of membranes and catalysts. The surface composition can change during operation due to segregation, thus controlling and predicting the surface composition is essential. Computational modelling can aid in predicting alloy stability, along with designing surface alloys...journal article 2023
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Aghaeian, S. (author), Norouzi, F. (author), Sloof, W.G. (author), Mol, J.M.C. (author), Bottger, A.J. (author)The parabolic growth rate constant (k<sub>p</sub>) of high-temperature oxidation of steels is predicted via a data analytics approach. Four machine learning models including Artificial Neural Networks, Random Forest, k-Nearest Neighbors, and Support Vector Regression are trained to establish the relations between the input features ...journal article 2023
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Aghaeian, S. (author), Brouwer, J.C. (author), Sloof, W.G. (author), Mol, J.M.C. (author), Bottger, A.J. (author)Since the oxidation reactions in the process of steel production occur in harsh conditions (i.e., high temperatures and gas atmospheres), it is practically impossible to observe in situ the compositional changes in the steel and the formed oxide scale. Hence, a coupled thermodynamic-kinetic numerical model is developed that predicts the...journal article 2023
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Izelaar, B. (author), Ripepi, D. (author), Asperti, S. (author), Dugulan, A.I. (author), Hendrikx, R.W.A. (author), Bottger, A.J. (author), Mulder, F.M. (author), Kortlever, R. (author)The electrochemical dinitrogen reduction reaction (NRR) has recently gained much interest as it can potentially produce ammonia from renewable intermittent electricity and replace the Haber-Bosch process. Previous literature studies report Fe- and Mo-carbides as promising electrocatalysts for the NRR with activities higher than other metals....journal article 2023
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Aghaeian, S. (author), Sloof, W.G. (author), Mol, J.M.C. (author), Bottger, A.J. (author)High-temperature oxidation of steels can be relatively fast when exposed to air. Consequently, elucidating the effect of different parameters on the oxidation mechanism and kinetics is challenging. In this study, short-time oxidation was investigated to determine the oxidation mechanism, the affecting parameters, and the linear-to-parabolic...journal article 2022
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Verma, N. (author), Delhez, R. (author), van der Pers, N.M. (author), Hendrikx, R.W.A. (author), Huizenga, R.M. (author), Bottger, A.J. (author)For Pd thin films, microstructural changes involved during hydrogen cycling provide the information needed to predict and optimize the film's mechanical strength. In this paper, a systematic study of the morphology, microstructure, texture, and stress has been performed on Pd thin films during hydrogen loading and deloading cycles at room...journal article 2022
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van der Pers, N.M. (author), Hendrikx, R.W.A. (author), Bottger, A.J. (author)An attachment has been developed for x-ray diffractometer systems equipped with a domed stage when using a 2D or 1D detector. It consists of a single screen in front of the detector positioned such that it blocks diffraction from the dome. This results in measured data free of disturbing spurious peaks and background, thereby greatly...journal article 2021
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Castelein, Sofie M. (author), Aarts, Tom F. (author), Schleppi, Juergen (author), Hendrikx, R.W.A. (author), Bottger, A.J. (author), Benz, D. (author), Brouns, S.J.J. (author), Meyer, A.S. (author), Lehner, B. (author)In-situ resource utilization (ISRU) is increasingly acknowledged as an essential requirement for the construction of sustainable extra-terrestrial colonies. Even with decreasing launch costs, the ultimate goal of establishing colonies must be the usage of resources found at the destination of interest. Typical approaches towards ISRU are...journal article 2021
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Verma, N. (author), Delhez, R. (author), van der Pers, N.M. (author), Tichelaar, F.D. (author), Bottger, A.J. (author)In this work, we studied the mechanical and thermal stability of ~100 nm Pd thin films magnetron sputter deposited on a bare oxidized Si(100) wafer, a sputtered Titanium (Ti) intermediate layer, and a spin-coated Polyimide (PI) intermediate layer. The dependence of the film stability on the film morphology and the film-substrate interaction...journal article 2021
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Zheng, X.X. (author), Bottger, A.J. (author), Jansen, K.M.B. (author), van Turnhout, J. (author), van Kranendonk, J (author)Alkaline water electrolysis becomes increasingly important for the supply of renewable energy, and of raw material for the chemical industry. An attractive choice for the encapsulation of the electrolyte cell is an (advanced) engineering polymer. The objective of this paper is to find a suitable one that can withstand for many years: 30 wt% KOH...journal article 2020
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Zhao, M. (author), Brouwer, J.C. (author), Sloof, W.G. (author), Bottger, A.J. (author)Ternary alloys have been developed for a wide range of applications and surface segregation of ternary alloys has a decisive impact on their performance. Different from binary alloys, in which surface energy is usually the dominant factor, the interaction between solute elements has a noticeable effect on the surface segregation behavior of...journal article 2020
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Zhao, M. (author), Brouwer, J.C. (author), Sloof, W.G. (author), Bottger, A.J. (author)Pd–Cu alloys have been investigated as promising candidates for hydrogen separation membranes. Surface segregation influences the long-term performance of these membranes since their catalytic effect is mainly controlled by the surface composition. In the present research, surface segregation of Pd-40 at.% Cu alloy in vacuum and various gas...journal article 2020
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Janssen, G.C.A.M. (author), van der Pers, N.M. (author), Hendrikx, R.W.A. (author), Bottger, A.J. (author), Kwakernaak, C. (author), Rieger, B. (author), Sluiter, M.H.F. (author)Single-crystal copper films on sapphire have recently been reported upon in relation to graphene growth on these films. In the present paper the kinetics of the formation of single crystal copper films is investigated. We demonstrate the importance of heating the sapphire substrate in 1000 hPa oxygen, followed by a fast cooling prior to...journal article 2020
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Zhang, B. (author), Wei, J. (author), Bottger, A.J. (author), van Zeijl, H.W. (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author)We report the design, fabrication and experimental investigation of a MEMS micro-hotplate (MHP) for fast time-resolved X-ray diffraction (TRXRD) study of Cu nanoparticle paste (nanoCu paste) sintering process. The device and its system are designed to have a 60 ms minimum time interval, uniform temperature distribution and variant gas...conference paper 2019
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Zhao, M. (author), Sloof, W.G. (author), Bottger, A.J. (author)Surface segregation of a series of forty Palladium-based binary alloys has been investigated using a thermodynamic model based on an atom exchange approach. Their surface segregation behaviour, both in vacuum and in gas environments, were comprehensively estimated. The calculated results are in good agreement with the available experimental...journal article 2018
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De Rooi, J.J. (author), Van der Pers, N.M. (author), Hendrikx, R.W.A. (author), Delhez, R. (author), Bottger, A.J. (author), Eilers, P.H.C. (author)X-ray diffraction scans consist of series of counts; these numbers obey Poisson distributions with varying expected values. These scans are often smoothed and the K2 component is removed. This article proposes a framework in which both issues are treated. Penalized likelihood estimation is used to smooth the data. The penalty combines the...journal article 2014
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Van der Pers, N.M. (author), Hendrikx, R.W.A. (author), Delhez, R. (author), Böttger, A.J. (author)A new diffracted-beam monochromator has been developed for Bragg-Brentano X-ray diffractometers equipped with a linear detector. The monochromator consists of a cone-shaped graphite highly oriented pyrolytic graphite crystal oriented out of the equatorial plane such that the parafocusing geometry is preserved over the whole opening angle of the...journal article 2013
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De Haan, V.O. (author), Plomp, J. (author), Rekveldt, M.T. (author), Van Well, A.A. (author), Dalgliesh, R.M. (author), Langridge, S. (author), Böttger, A.J. (author), Hendrikx, R. (author)Based on the application of coherence theory to neutron scattering a description is given of the propagation of neutrons or x-rays through a reflectometer. Important coherence effects at the sample position are discussed. Further, an outline is given how to determine the measured count rate in a detector on the basis of this method including...journal article 2010
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- Nanu, D.E. (author), Deng, Y. (author), Böttger, A.J. (author) journal article 2006
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Shamsutdinov, N.R. (author), Sloof, W.G. (author), Böttger, A.J. (author)A method is presented to determine the photoelectron surface core-level shift (SCLS) of 3d transition metals using x-ray photoelectron spectroscopy. The experimental difficulties arising from the relatively large broadening of photoemission lines in the 3d transition series can be overcome by the analysis of the angular dependence of...journal article 2005