Searched for: author%3A%22van+Ommen%2C+J.R.%22
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Graas, Adriaan B.M. (author), Wagner, E.C. (author), van Leeuwen, Tristan (author), van Ommen, J.R. (author), Batenburg, K. Joost (author), Lucka, Felix (author), Portela, L. (author)
A new X-ray computed tomography technique for the purpose of imaging fluidized beds is presented. It consists of an experimental set-up with three stationary X-ray source and flat panel detector pairs, a geometric calibration and data processing workflow, and an image reconstruction algorithm. The technique enables sparse-angular tomographic...
journal article 2024
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Kamphorst, R. (author), Wanjari, Pratyush (author), Saedy, S. (author), van Dam, Julia F.K. (author), Thijssen, A. (author), Brüner, Philipp (author), Grehl, Thomas (author), Meesters, G.M.H. (author), van Ommen, J.R. (author)
In this study, we investigated the wettability and agglomeration characteristics of polymer microspheres coated with low-temperature deposited SiO<sub>2</sub> in a fluidized bed atomic layer deposition (ALD) setup. Surface characterization revealed the presence of a significant amount of deposited Si-OH groups within the first cycles. A...
journal article 2024
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Bleeker, J.J. (author), van Kasteren, Celine (author), van Ommen, J.R. (author), Vermaas, D.A. (author)
To make green hydrogen more economically attractive, the energy losses in alkaline electrolysis need to be minimized while operating at high current densities (1 A cm<sup>−2</sup>). At these current densities the ohmic resistance and gas bubbles effects contribute largely to the energy losses. To mitigate the gas bubbles losses, we...
journal article 2024
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Li, M. (author), Saedy, S. (author), Fu, S. (author), Stellema, T.P. (author), Kortlever, R. (author), van Ommen, J.R. (author)
Extending the lifetime of electrocatalytic materials is a major challenge in electrocatalysis. Here, we employ atomic layer deposition (ALD) to coat the surface of carbon black supported platinum nanoparticles (Pt/CB) with an ultra-thin layer of silicon dioxide (SiO2) to prevent deactivation of the catalyst during H2 evolution. Our results show...
journal article 2024
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Sajeev Kumar, A. (author), Moura de Salles Pupo, M. (author), Petrov, K.V. (author), Ramdin, M. (author), van Ommen, J.R. (author), de Jong, W. (author), Kortlever, R. (author)
Aqueous electrolytes used in CO2 electroreduction typically have a CO2 solubility of around 34 mM under ambient conditions, contributing to mass transfer limitations in the system. Non-aqueous electrolytes exhibit higher CO2 solubility (by 5–8-fold) and also provide possibilities to suppress the undesired hydrogen evolution reaction (HER). On...
journal article 2023
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Zhang, F. (author), Wu, K. (author), La Zara, D. (author), Sun, F. (author), Quayle, Michael J. (author), Petersson, Gunilla (author), Folestad, Staffan (author), Chew, Jia Wei (author), van Ommen, J.R. (author)
For dry powder inhaled formulations, good flow behaviour is vital in re-dispersing the powder. However, inhaled drug powders with a particle size below 10 µm are classified as highly cohesive materials with poor flow characteristics. Here we demonstrate how to alter the flow properties of micronized budesonide powders by depositing different...
journal article 2023
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Uglietti, R. (author), Micale, Daniele (author), La Zara, D. (author), Goulas, A. (author), Nardi, Luca (author), Bracconi, Mauro (author), van Ommen, J.R. (author), Maestri, Matteo (author)
We show the potential of coupling numerical and experimental approaches in the fundamental understanding of catalytic reactors, and in particular fluidized beds. The applicability of the method was demonstrated in a lab-scale fluidized bed reactor for the platinum-based catalytic oxidation of hydrogen. An experimental campaign has been...
journal article 2023
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Kim, S. (author), Dierkes, Wilma K. (author), Blume, Anke (author), Talma, Auke (author), van Ommen, J.R. (author), Courtois, Nicolas (author), Davin, Julian (author), Recker, Carla (author), Schoeffel, Julia (author)
Pre-treated silica with a plasma-deposited (PD) layer of polymerized precursors was tested concerning its compatibility with Natural Rubber (NR) and its influence on the processing of silica-silane compounds. The modification was performed in a tailor-made plasma reactor. The degree of deposition of the plasma-coated samples was analyzed by...
journal article 2023
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Wu, K. (author), Wagner, E.C. (author), Ochkin-Koenig, Olga (author), Franck, Miika (author), Weis, Dominik (author), Meesters, G.M.H. (author), van Ommen, J.R. (author)
Mechanical vibration has been broadly used to assist fluidization of cohesive powders, because of its capability to disrupt gas channels and agglomerates. However, the improvement reported in literature is mostly deduced from bulk response and ex-situ measurements, whereas the induced fluidization behavior and underlying physics remain...
journal article 2023
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Moulijn, J.A. (author), van Ommen, J.R. (author), Goulas, A. (author), Valdesueiro Gonzalez, D. (author), Juan-Alcañiz, Jana (author), Au-Yeung, Kar Ming (author), Woning, Leo (author), Bergwerff, Jaap A. (author)
The feasibility of gas phase deposition using a Ti alkoxide precursor for precise surface modification of catalysts was demonstrated by modifying a mesoporous alumina support with a Ti oxide overcoat. Titanium tetra-isopropoxide yields a Ti oxide layer that covers homogeneously the alumina surface. Uniformity of the deposited TiO<sub>2</sub>...
journal article 2023
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Nederstigt, Tom A.P. (author), Bode, Bo (author), van Ommen, J.R. (author), Peijnenburg, Willie J.G.M. (author), Vijver, Martina G. (author)
Novel nanomaterial-based pesticide formulations are increasingly perceived as promising aids in the transition to more efficient agricultural production systems. The current understanding of potential unintended (eco)toxicological impacts of nano-formulated pesticides is scarce, in particular with regard to (non-target) aquatic organisms and...
journal article 2023
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Mahtabani, Amirhossein (author), La Zara, D. (author), Niittymäki, Minna (author), Anyszka, Rafał (author), Rytöluoto, Ilkka (author), He, Xiaozhen (author), Saarimäki, Eetta (author), Saedy, S. (author), van Ommen, J.R. (author)
Polymer nanocomposites (NCs) offer outstanding potential for dielectric applications including insulation materials. The large interfacial area introduced by the nanoscale fillers plays a major role in improving the dielectric properties of NCs. Therefore, an effort to tailor the properties of these interfaces can lead to substantial...
journal article 2023
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Bagemihl, I. (author), Cammann, Lucas (author), Pérez-Fortes, Mar (author), van Steijn, V. (author), van Ommen, J.R. (author)
The production of base chemicals by electrochemical conversion of captured CO<sub>2</sub> has the potential to close the carbon cycle, thereby contributing to a future energy transition. With the feasibility of low-temperature electrochemical CO<sub>2</sub> conversion demonstrated at lab scale, research is shifting toward optimizing...
journal article 2023
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Zhao, Y. (author), Wang, Xiao (author), Li, Quan an (author), Zhang, Xinyu (author), Li, Ye (author), Xie, Rong Jun (author), van Ommen, J.R. (author), Hintzen, H.T.J.M. (author)
The cyan-emitting BaSi<sub>2</sub>O<sub>2</sub>N<sub>2</sub>:Eu<sup>2+</sup> phosphor is a promising narrow-band and high-efficiency luminescent material used in wide-color-gamut white light-emitting diodes (wLEDs). However, its serious degradation under thermal attacks hinders its practical applications and needs to be improved. Herein, we...
journal article 2023
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Feng, Zhen (author), Liu, Daoyin (author), Zhang, Wangle (author), Feng, Hao (author), van Ommen, J.R. (author)
Fluidization of nanoparticle agglomerates is a promising technique to process nanoparticles. However, possible elutriation of small agglomerates may cause significant loss of bed material. To obtain the elutriation behavior under stable operation, in this study the elutriation fraction of silica nanoparticle agglomerates is measured in a...
journal article 2022
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Tsalidis, G.A. (author), Soeteman-Hernández, Lya G. (author), Noorlander, Cornelle W. (author), Saedy, S. (author), van Ommen, J.R. (author), Vijver, Martina G. (author), Korevaar, G. (author)
Safe-and-sustainable-by-design (SSbD) is a concept that takes a systems approach by integrating safety, sustainability, and functionality throughout a product’s the life cycle. This paper proposes a framework based on a prospective life cycle assessment for early safety and sustainability assessment. The framework’s purpose is to identify...
journal article 2022
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Benz, D. (author), Van Bui, Hao (author), Hintzen, H.T.J.M. (author), Kreutzer, M.T. (author), van Ommen, J.R. (author)
The photocatalytic mechanism of TiO<sub>2</sub> (P25) nanoparticles coated with SiO<sub>2</sub> (SiO<sub>2</sub>:TiO<sub>2</sub>) by atomic layer deposition was investigated. The deposition of SiO<sub>2</sub> on TiO<sub>2</sub> not only gives a photocatalytic improvement for the degradation of both Rhodamine B (3.6–fold) and Acid Blue 9 (3...
journal article 2022
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Sewalt, E.J.G. (author), Kalkman, J. (author), van Ommen, J.R. (author), Meesters, G.M.H. (author), van Steijn, V. (author)
Properties of powders produced from drying solute-containing droplets arise from the dynamic redistribution of solute during drying. While insights on the dynamic redistribution are instrumental for the rational design of powders and for the optimized operation of equipment such as spray dryers, experimental techniques that allow measuring...
journal article 2022
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Saedy, S. (author), Hiemstra, Nico (author), Benz, D. (author), Van Bui, Hao (author), Nolan, Michael (author), van Ommen, J.R. (author)
The promotional effects on photocatalytic hydrogen production of Cu<sub>x</sub>O clusters deposited using atomic layer deposition (ALD) on P25 TiO<sub>2</sub> are presented. The structural and surface chemistry study of Cu<sub>x</sub>O/TiO<sub>2</sub> samples, along with first principles density functional theory simulations, reveal the...
journal article 2022
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Wu, K. (author), Galli, Federico (author), de Tommaso, Jacopo (author), Patience, Gregory S. (author), van Ommen, J.R. (author)
Pressure and temperature are the most important state variables for monitoring physicochemical processes to detect deviations that might lead to explosions and to verify levels, flow rate, and solids/gas hold-up. Pressure fluctuations in multi-phase systems identify regime changes and flow anomalies. Pressure signals are the first indicator...
journal article 2022
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