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2. The effect of O-vacancies on intermediates stability and electron delocalization over MgO modified Ru/ZrO2: Spectroscopic insights during CO2 methanation

Author

Cisneros, S., Santa-Taborda, L., Martínez Quintana, Laura, Rabee, A.I.M., Abed, H., Rockstroh, N., Bartling, S., Romero-Sáez, M., Atia, H., Belén Dongil, A., Brückner, A., Rabeah, J., Cisneros, S., Santa-Taborda, L., Martínez Quintana, Laura, Rabee, A.I.M., Abed, H., Rockstroh, N., Bartling, S., Romero-Sáez, M., Atia, H., Belén Dongil, A., Brückner, A., and Rabeah, J.

Abstract

O-vacancies are defects commonly correlated with the production of CH4 by CO2 hydrogenation on reducible catalysts. Their effect on the stability of active COads and its origin is, however, not commonly explored for low Ru-loaded catalysts (Ru < 0.5 wt%). Herein, we investigated two catalysts containing a comparable amount of Ru (≈ 0.4 wt%) on two different zirconia supports: ZrO2 and ZrO2-MgO (2.6 wt%-MgO). The rate of CH4 formation on Ru/ZrO2-MgO is ca. 3-fold higher than on Ru/ZrO2. Combined results from various ex-situ and in-situ characterization techniques provide evidence supporting the correlation between methane evolution and the extended Ru-support perimeter as well as with changes in the bond strength of intermediates modulated by O-vacancies. This latter effect represents the main difference between the two catalysts since the replacement of Zr4+ by Mg2+ ions in the ZrO2 lattice promotes the generation of O-vacancies, facilitating electron transfer from them to interfacial Ru sites. This not only enhances H2 activation but also weakens the stability of adsorbed bidentate formate (b-HCOO-ads), which subsequently decomposes to COads and then hydrogenates to CH4 at the Ru-support perimeter. © 2023 The Authors

Published
2023

3. strijd om ons grondwater

Author

Bartling, S. and Bartling, S.

Abstract

Het belooft weer een droge zomer te worden, voor het vijfde jaar op rij. Daardoor ontstaat in grote delen van Nederland een run op grondwater. Gevolg: forse schade aan landschap en natuur. De waterschappen moeten drastische maatregelen nemen om de verdroging van Nederland tegen te gaan. Maar nemen ze die ook? In de uitzending zijn te gast Watergraaf Erik de Ridder van waterschap De Dommel en Joris Hogenboom, directeur van natuurbeschermingsorganisatie Brabants Landschap.

Published
2022

17. Application of bone anchored referencing with an electromagnetic navigation system to the lateral skull base?

Author

Majdani, O., Heermann, R., Bartling, S., Lenarz, T., and Leinung, M.

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Introduction Currently, electromagnetic navigation systems are well-established in procedures at the frontal skull base. Problems arise if a surgeon intends to perform lateral skull base surgery by use of these systems. For example the heaset of the InstaTrak3500 (GE Medical®) is optimized [for full text, please go to the a.m. URL], ESBS 2005: Skull Base Surgery: An Interdisciplinary Challenge; 7th Congress of the European Skull Base Society held in association with the 13th Congress of the German Society of Skull Base Surgery

Published
2009

19. Volume Computed Tomography for navigated procedures at the lateral skull base - proof of feasibility on phantom and human temporal bone specimens

Author

Majdani, O, Bartling, S, Rodt, T, Eilers, H, Dullin, C, Issa, G, Rau, T, Lenarz, M, Lenarz, T, and Leinung, M

Subjects
Volume Computed Tomography, intraoperative navigation, ddc: 610, otorhinolaryngologic diseases, percutaneus cochlear implant surgery, image guided surgery
Abstract

Hypothesis: High-resolution imaging as provided by flat-panel based Volume Computed Tomography (fpVCT) could increase navigation accuracy and could therefore be valuable on lateral skull base procedures. Methods: In the first part of the study we evaluated the accuracy of the image guided surgery (IGS) system using a custom made phantom that was scanned both in a Multislice CT scanner (MSCT, GE Lightspeed 16Pro, GE Healthcare, Milwaukee, WI) and in an experimental fpVCT scanner (GE Healtcare). We performed measurements of the Target Registration Error (TRE) with the optoelectronic navigation system VectorVision2 (BrainLAB, Feldkirchen, Germany). In the second part of the study four temporal bone specimens were scanned in the fpVCT device. The data were transferred to the VectorVision2 planning station. The route from the surface of the mastoid to the scala tympani of the cochlea was planned as a direct channel passing the facial recess without injuring the facial nerve and other functionally important anatomical structures of the temporal bone. During surgery the preoperatively defined trajectory was followed from the entry point to the target point using a navigated and hand-held surgical drill. MSCT imaging was acquired to document the position of the drilled channel's position. In addition a routine mastoidectomy and posterior tympanotomy was performed on each specimen to document the drilled route. Results: The accuracy measurements on the phantom revealed that the average TRE using MSCT (0.82 mm, SD: 0.35 mm) was significantly higher than using fpVCT (0.46, SD: 0.22 mm) (p

Published
2007

20. Robotic-guided minimally-invasive cochleostomy: first results

Author

Leinung, M, Baron, S, Eilers, H, Heimann, B, Bartling, S, Heermann, R, Lenarz, T, and Majdani, O

Subjects
ddc: 610, high precision surgery, otorhinolaryngologic diseases, sense organs, cochlear implant surgery, navigation, robotic assistance device, minimally invasive surgery
Abstract

Due to increasing claims on high precision surgery, robotic assistance is becoming an emerging and highly demanded technology. Especially in surgical procedures in regions with complex anatomy mechatronical devices could help prevent iatrogen damaging of risk structures. In Otolaryngology particular cochlear implantation is a procedure characterized by a high degree of complexity and required accuracy. This surgery, which is accepted to be the most suitable solution for recovery from deafness, demands a exactly localized opening of the cochlea and an atraumatic insertion of a stimulating electrode array within the scala tympani. This paper presents a new minimally-invasive method for the preparation of the implant's slot using a combination of high resolution imaging, stereo-optical navigation and a robotic manipulator. In this contribution, we introduce the hardware components of the system as well as its software structure and present first experimental results of a robot assisted minimal invasive cochleostomy.

Published
2007

28. Accuracy measurement of Volume-CT using a phantom

Author

Leinung, M, Bartling, S, Dullin, C, Rodt, T, Stöver, T, Becker, H, Lenarz, T, Majdani, O, Leinung, M, Bartling, S, Dullin, C, Rodt, T, Stöver, T, Becker, H, Lenarz, T, and Majdani, O

Published
2009

34. CT-MR-Fusion and 3D-Imaging of the temporal bone

Author

Rodt, T, Peldschus, K, Kaminsky, J, Bartling, S, Matthies, H, Becker, H, Zumkeller, M, Rodt, T, Peldschus, K, Kaminsky, J, Bartling, S, Matthies, H, Becker, H, and Zumkeller, M

Published
2004

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