2025 2024 Magnetic resonance imaging for 3D-printed structured packings - Conference PresentationRennebaum, Hannah Sophie ; Dobschall, Alina ; Benders, Stefan ; Skiborowski, Mirko ; Penn, Alexander 16th International Conference on Gas–Liquid and Gas–Liquid–Solid Reactor Engineering, GLS-16: (2024) The TUHH process imaging system - Conference Poster not in ProceedingsBenders, Stefan ; Rennebaum, Hannah Sophie ; Özdemir, Melis ; Lenczyk, Till ; Penn, Alexander 16th International Bologna Conference Magnetic Resonance in Porous Media (MRPM 2024) MRI in chemical engineering applications - Conference PresentationBenders, Stefan ; Penn, Alexander IFIP TC7 System Modeling and Optimization (2024) Magnetic resonance velocimetry of particle hydrodynamics in a three-dimensional draft tube spout-fluid bed - Journal ArticleMetzger, Jens P. ; Chen, Boyuan ; Penn, Alexander ; Guenthner, Christian ; Prüssmann, Klaas P. ; Müller, Christoph R. Chemical Engineering Journal 485: 149678 (2024) Open Access | Publisher DOI The effect of baffles on the hydrodynamics of a gas-solid fluidized bed studied using real-time magnetic resonance imaging - Journal ArticleRennebaum, Hannah Sophie ; Brummerloh, Daniel Lukas ; Benders, Stefan ; Penn, Alexander Powder Technology 432: 119114 (2024) Open Access | Publisher DOI Advancing SMART Reactors through NMR Relaxometry : Characterization of Stimuli-Responsive Lyogels - Conference PosterAdrian, Muhammad ; Eckert, Kathrin ; Serial, Maria Raquel ; Tsanda, Artyom ; Benders, Stefan ; Knopp, Tobias ; Smirnova, Irina ; Penn, Alexander 16th International Bologna Conference Magnetic Resonance in Porous Media (MRPM 2024) Open Access 2023 Magnetic resonance imaging in granular flows: An overview of recent advances - Review ArticleClarke, Daniel ; Hogendoorn, Willian ; Penn, Alexander ; Serial, Maria Raquel Particuology (in Press): (2023) Publisher DOI Computer simulation of magnetic resonance imaging of the flow of fluidized particles - Journal ArticleBordbar, Alireza ; Benders, Stefan ; Zia, Wasif ; Penn, Alexander ; Boyce, Christopher M. Industrial and Engineering Chemistry Research 62 (29): 11677–11688 (2023-07-12) Publisher DOI Magnetic resonance imaging of fluidized beds with baffles - Conference PresentationBuchholz, Hannah Sophie ; Brummerloh, Daniel Lukas ; Benders, Stefan ; Penn, Alexander Quantitative NMR Methods for Reaction and Process Monitoring (NMRPM 2023) Temperature distribution in a gas-solid fixed bed probed by rapid magnetic resonance imaging - Journal ArticleSerial, Maria Raquel ; Benders, Stefan ; Rotzetter, Perrine ; Brummerloh, Daniel Lukas ; Metzger, Jens Patrick ; Gross, Simon P. ; Nussbaum, Jennifer ; Müller, Christoph ; Prüssmann, Klaas P. ; Penn, Alexander Chemical Engineering Science 269: 118457 (2023-04-05) Publisher DOI 2022 The effect of baffles on fluidized bed hydrodynamics - A magnetic resonance imaging study - Conference PresentationBuchholz, Hannah Sophie ; Brummerloh, Daniel Lukas ; Benders, Stefan ; Penn, Alexander Annual Meeting on Reaction Engineering and ProcessNet Subject Division Heat and Mass Transfer (2022) Quantifying wall effects in fluidized beds using real-time magnetic resonance imaging - Conference Poster not in ProceedingsBrummerloh, Daniel Lukas ; Buchholz, Hannah Sophie ; Benders, Stefan ; Penn, Alexander Annual Meeting on Reaction Engineering and ProcessNet Subject Division Heat and Mass Transfer 2022 A review on fast tomographic imaging techniques and their potential application in industrial process control - Journal ArticleHampel, Uwe ; Babout, Laurent ; Banasiak, Robert ; Schleicher, Eckhard ; Soleimani, Manuchehr ; Wondrak, Thomas ; Vauhkonen, Marko ; Lähivaara, Timo ; Tan, Chao ; Hoyle, Brian ; Penn, Alexander Sensors 22 (6): 2309 (2022) Open Access | Publisher DOI 2021 Stereo camera based in-situ monitoring of L-PBF process stability by spatter detection - Conference PaperBrummerloh, Daniel Lukas ; Jutkuhn, Dennis ; Yang, Zheng ; Penn, Alexander ; Emmelmann, Claus Advancing Precision in Additive Manufacturing (2021) CFD-DEM study of bubble properties in a cylindrical fluidized bed of Geldart Group D particles and comparison with prior MRI data - Journal ArticleXi, Kenan ; Kovar, Thomas M. ; Fullmer, William D. ; Penn, Alexander ; Musser, Jordan ; Boyce, Christopher M. Powder Technology 389: 75-84 (2021-09) Publisher DOI Mechanism of anomalous sinking of an intruder in a granular packing close to incipient fluidization - Journal ArticleTsuji, Takuya ; Penn, Alexander ; Hattori, Taisuke ; Prüssmann, Klaas P. ; Müller, Christoph ; Oshitani, Jun ; Washino, Kimiaki ; Tanaka, Toshitsugu Physical Review Fluids 6 (6): 064305 (2021-06) Publisher DOI 2020 Link between packing morphology and the distribution of contact forces and stresses in packings of highly nonconvex particles - Journal ArticleConzelmann, Nicholas ; Penn, Alexander ; Partl, Manfred N. ; Clemens, F. J. ; Poulikakos, Lily ; Müller, Christoph Rüdiger Physical Review E 6 (102): 062902 (2020-12-21) Publisher DOI Combined Real-Time Magnetic Resonance Imaging and Numerical Simulation of Gas Bubble Splitting and Coalescence in Fluidized Beds - Conference PaperMetzger, Jens ; Suter, Mathieu ; Penn, Alexander ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger AIChE Annual Meeting (2020) Real-Time Magnetic Resonance Velocimetry and Thermometry of Gas-Solid Systems - Conference PaperRotzetter, Perrine ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger ; Penn, Alexander AIChE Annual Meeting (2020) Asynchronous bubble pinch-off pattern arising in fluidized beds due to jet interaction : a magnetic resonance imaging and computational modeling study - Journal ArticlePenn, Alexander ; Padash, Azin ; Lehnert, M. ; Prüssmann, Klaas P. ; Müller, Christoph ; Boyce, Christopher M. Physical Review Fluids 9 (5): 094303 (2020-09-25) Open Access | Publisher DOI Regimes of jetting and bubbling in a fluidized bed studied using real-time magnetic resonance imaging - Journal ArticlePenn, Alexander ; Boyce, Christopher M. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger Chemical Engineering Journal (383): 123185 (2020-03-01) Publisher DOI Magnetic resonance thermometry of gas‐solid systems - Journal ArticleRotzetter, Perrine ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger ; Penn, Alexander Chemie Ingenieur Technik 9 (92): 1180-1180 (2020) Publisher DOI 2019 Wake volume of injected bubbles in fluidized beds: A magnetic resonance imaging velocimetry study - Journal ArticleBoyce, Christopher M. ; Penn, Alexander ; Lehnert, M. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger Powder Technology (357): 428-435 (2019-12-01) Publisher DOI Characteristics of a single jet injected into an incipiently fluidized bed: A magnetic resonance imaging study - Journal ArticleBoyce, Christopher M. ; Penn, Alexander ; Lehnert, M. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger Advanced Powder Technology 12 (30): 3146-3152 (2019-12) Publisher DOI Magnetic resonance imaging of interaction and coalescence of two bubbles injected consecutively into an incipiently fluidized bed - Journal ArticleBoyce, Christopher M. ; Penn, Alexander ; Lehnert, M. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger Chemical Engineering Science (208): 115152 (2019-11-23) Publisher DOI Real-time imaging of granular dynamics - Conference PaperPenn, Alexander ; Boyce, Christopher M. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger International Conference on Magnetic Resonance Microscopy (ICMRM 2019) Magnetic resonance imaging of single bubbles injected into incipiently fluidized beds - Journal ArticleBoyce, Christopher M. ; Penn, Alexander ; Lehnert, M. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger Chemical Engineering Science (200): 147-166 (2019-06-08) Publisher DOI Gravitational instabilities in binary granular materials - Journal ArticleMcLaren, Christopher ; Kovar, Thomas M. ; Penn, Alexander ; Müller, Christoph Rüdiger ; Boyce, Christopher M. Proceedings of the National Academy of Sciences of the United States of America 19 (116): 9263-9268 (2019-05-07) Publisher DOI Real-time magnetic resonance imaging of fluidized beds with internals - Journal ArticlePenn, Alexander ; Boyce, Christopher M. ; Conzelmann, Nicholas ; Bezinge, Gaëtan ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger Chemical Engineering Science (198): 117-123 (2019-04-28) Publisher DOI Anomalous collapse of interacting bubbles in a fluidized bed : a magnetic resonance imaging study - Journal ArticleBoyce, Christopher M. ; Penn, Alexander ; Padash, Azin ; Lehnert, M. ; Prüssmann, Klaas P. ; Müller, Christoph Physical Review Fluids 3 (4): 034303 (2019-03-18) Open Access | Publisher DOI Magnetic resonance imaging of the interaction of bubbles and jets injected into fluidized beds - Conference PaperBoyce, Christopher M. ; Penn, Alexander ; Lehnert, M. ; Padash, A. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger March Meeting of the American Physical Society (2019) Effect of liquid bridging on bubbles injected into a fluidized bed: A magnetic resonance imaging study - Journal ArticleBoyce, Christopher M. ; Penn, Alexander ; Lehnert, M. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger Powder Technology (343): 813-820 (2019-02-01) Publisher DOI Rayleigh-Taylor Instability in Vibrated Gas-Fluidized Particles - Conference PaperBoyce, Christopher M. ; McLaren, Christopher ; Kovar, Thomas M. ; Penn, Alexander ; Müller, Christoph Rüdiger AIChE Annual Meeting (2019) Homogeneous, High Packing Fraction Fluidization of Coarse Particles Using a Combination of Gas Flow and Vibration - Conference PaperBoyce, Christopher M. ; McLaren, Christopher ; Kovar, Thomas M. ; Penn, Alexander ; Müller, Christoph Rüdiger Fluidization XVI, Guilin, China (2019) Fluidized Beds with Internals: A Real-Time Magnetic Resonance Imaging Study of Gas Bubbles and Particle Motion - Conference PaperConzelmann, Nicholas ; Boyce, Christopher M. ; Penn, Alexander ; Pruessmann, Klaas Paul Fluidization XVI, Guilin, China (2019) 2018 Magnetic resonance imaging of injected bubble and jet dynamics in fluidized beds - Conference PaperBoyce, Christopher M. ; Penn, Alexander ; Lehnert, M. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger AIChE Annual Meeting (2018) Magnetic resonance imaging of gas–solid fluidization with liquid bridging - Journal ArticleBoyce, Christopher M. ; Penn, Alexander ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger AIChE Journal 8 (64): 2958-2971 (2018-08) Publisher DOI Real-Time magnetic resonance imaging of bubble behavior and particle velocity in fluidized beds - Journal ArticlePenn, Alexander ; Boyce, Christopher M. ; Kovar, Thomas M. ; Tsuji, Takuya ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger Industrial and Engineering Chemistry Research 29 (57): 9674-9682 (2018-07-25) Publisher DOI A high-performance gradient insert for rapid and short-T₂ imaging at full duty cycle - Journal ArticleWeiger, Markus ; Overweg, Johan ; Rösler, Manuela Barbara ; Froidevaux, Romain ; Hennel, Franciszek ; Wilm, Bertram Jakob ; Penn, Alexander ; Sturzenegger, Urs ; Schuth, Wout ; Mathlener, Menno ; Borgo, Martino ; Börnert, Peter ; Leussler, Christoph ; Luechinger, Roger ; Dietrich, Benjamin Emanuel ; Reber, Jonas ; Brunner, David Otto ; Schmid, Thomas M. ; Vionnet, Laetitia ; Pruessmann, Klaas Paul Magnetic Resonance in Medicine 6 (79): 3256-3266 (2018-06) Publisher DOI MRI of bubble and jet injection into fluidized beds - Conference PaperBoyce, Christopher M. ; Penn, Alexander ; Lehnert, M. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger NETL Workshop on Multiphase Flow Science (2018) MRI of Anomalous Flow upon Gas Injection into Fluidized Beds - Conference Poster not in ProceedingsBoyce, Christopher M. ; Penn, Alexander ; Lehnert, M. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger Granular Matter Gordon Research Conference (2018) Real-time magnetic resonance imaging of gas-solid fluidization - Conference PaperPenn, Alexander ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger Jahrestreffen Reaktionstechnik, Würzburg, Germany (2018) Magnetic Resonance Imaging and Modeling of Liquid-Solid Fluidization - Conference PaperBoyce, Christopher M. ; Penn, Alexander ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger World Congress on Particle Technology (2018) On the Mechanism of Anomalous Sphere Sinking in Apparently Fixed Particle Beds (Discrete Particle Simulation and Ultra-Fast MRI Measurement) - Conference PaperTsuji, Takuya ; Penn, Alexander ; Müller, Christoph Rüdiger ; Hattori, Taisuke ; Oshitani, Jun ; Pruessmann, Klaas Paul World Congress on Particle Technology (2018) Im Takt des Kernspins: Blitzschnelle Bilder aus den Inneren granularer Medien - Journal ArticlePenn, Alexander ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger GIT Labor-Fachzeitschrift 62 (9): (2018) Detection of Fluidization with Real-Time Magnetic Resonance Imaging - Conference PaperPenn, Alexander ; Boyce, Christopher M. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger 8th World Congress on Particle Technology (2018) Real-time magnetic resonance Imaging of granular dynamics - Doctoral ThesisPenn, Alexander ETH Zürich: Diss. ETH No. 24619 (2018) Publisher DOI 2017 Real-time probing of granular dynamics with magnetic resonance - Journal ArticlePenn, Alexander ; Tsuji, Takuya ; Brunner, David Otto ; Boyce, Christopher M. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger Science Advances 9 (3): e1701879 (2017-09) Open Access | Publisher DOI Real-time magnetic resonance imaging of granular flows - Conference Poster not in ProceedingsPenn, Alexander ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger Powders and grains (2017) Magnetic resonance imaging of gas-solid fluidization with liquid bridging - Conference Poster not in ProceedingsBoyce, Christopher M. ; Penn, Alexander ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger International Conference on Micromechanics of Granular Media (Powders and grains 2017) A high-performance head and extremity insert gradient for rapid and short-T2 imaging: 200 mT/m, 1200 mT/m/ ms, and 100% duty cycle - Conference PaperWeiger, Markus ; Overweg, Johan ; Rösler, Manuela Barbara ; Froidevaux, Romain ; Hennel, Franciszek ; Wilm, Bertram Jakob ; Penn, Alexander ; Sturzenegger, Urs ; Schuth, Wout ; Mathlener, Menno ; Borgo, Martino ; Börnert, Peter ; Leussler, Christoph ; Luechinger, Roger ; Dietrich, Benjamin Emanuel ; Reber, Jonas ; Brunner, David Otto ; Schmid, Thomas M. ; Vionnet, Laetitia ; Pruessmann, Klaas Paul ESMRMB Congress (2017) Magnetic Resonance Imaging of Wet Fluidization - Conference PaperBoyce, Christopher M. ; Penn, Alexander ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger AIChE Annual Meeting (2017) 2016 2015 2014 Correlating surface cation composition and thin film microstructure with the electrochemical performance of lanthanum strontium cobaltite (LSC) electrodes - Journal ArticleRupp, Ghislain M. ; Limbeck, Andreas ; Kubicek, Markus ; Penn, Alexander ; Stöger-Pollach, Michael ; Friedbacher, Gernot ; Fleig, Jürgen Journal of Materials Chemistry A 2 (19): 7099-7108 (2014-05-21) Open Access | Publisher DOI Electrochemical properties of La₀.₆Sr₀.₄CoO 3 - δ thin films investigated by complementary impedance spectroscopy and isotope exchange depth profiling - Journal ArticleKubicek, Markus ; Huber, Tobias M. ; Welzl, Andreas ; Penn, Alexander ; Rupp, Ghislain M. ; Bernardi, Johannes ; Stöger-Pollach, Michael ; Hutter, Herbert ; Fleig, Jürgen Solid State Ionics (256): 38-44 (2014-03-01) Open Access | Publisher DOI Parallel Magnetic Resonance Imaging of fluidized and spouted beds - Conference PaperPenn, Alexander ; Köhl, Maximilian H. ; Third, James R. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger International Workshop on Fluid-Particle Systems (2014) Magnetic resonance imaging of granular matter - Conference PaperPenn, Alexander ; Köhl, Maximilian H. ; Pruessmann, Klaas Paul ; Müller, Christoph Rüdiger Condensed Matter (2014) 2013
