Article
Chemistry, Multidisciplinary
Souma Yoshida, Naoya Murakami, Yoshiyuki Takatsuji, Tetsuya Haruyama
Summary: In this study, the authors found that dissociated nitrogen (N-atom) had a greater impact on ammonia selectivity in the plasma/liquid interfacial reaction compared to excited nitrogen molecules. By connecting the reaction locus with a high N-atom generation device, they achieved high selectivity in aqueous ammonia production while minimizing the formation of aqueous nitrate ions. The researchers also observed the release of oxygen and hydrogen atoms from water, forming NO and hydrogen gas, which further improved the ammonia synthesis selectivity.
Article
Materials Science, Coatings & Films
Tomoyuki Nonaka, Kazuo Takahashi, Akimi Uchida, Stefan Lundgaard, Osamu Tsuji
Summary: The Bosch process is a deep etching method that uses polymerized films as passivation films. This study measured the deposition rate and etch rate of the passivation films and analyzed their chemical composition. The results showed that the deposition rate has a local maximum and decreases when the pressure exceeds a certain value. The chemical composition of the films does not affect their etch rates, but exposure to F radicals transforms the composition into one with a higher CF2 bond content.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Chemistry, Physical
Nadia Babaei Bidmeshki, Yavar T. Azar, Farhood Ziaie, Mehdi Janbazi
Summary: This study conducted a theoretical analysis of radiation-induced signals radicals and mechanisms in order to propose methods to distinguish the original signal from unwanted noise in irradiated nails. It also included procedures to enhance the accuracy of dosimetry measurements. Different amino acid sequences did not result in new peaks in the EPR signals, and the neighborhood effect only caused a slight change in signal peak broadening.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Woojin Park, Jonggu Han, Solee Park, Se Youn Moon
Summary: This study investigates the effects of substituting nitrogen for oxygen in C4F8/Ar plasmas. The addition of nitrogen dramatically reduces the thickness of the deposited layer on the Si substrate. The interaction between the plasma and surface switches from polymerization to etching by the introduction of nitrogen, and nitrogen atoms in the plasma scavenge fluorocarbon molecules involved in polymer deposition.
Article
Biochemistry & Molecular Biology
Pauline Nibbe, Johannes Schleusener, Silas Siebert, Richard Borgart, Doreen Brandt, Ronja Westphalen, Nadine Schuler, Bastian Berger, Eva M. J. Peters, Martina C. Meinke, Silke B. Lohan
Summary: Oxidative stress is a driving factor for diseases and has led to a growing trend of using antioxidant supplementation. This study developed a stress response assessment method using in-situ irradiation and electron paramagnetic resonance spectroscopy. The method was validated in a pilot study and showed positive correlations between oxidative stress coping capacity and vitamin C concentration in blood plasma. The method has potential applications in future studies and clinical routine.
FREE RADICAL BIOLOGY AND MEDICINE
(2023)
Article
Physics, Applied
Byung Jun Lee, Alexander Efremov, Kwang-Ho Kwon
Summary: The study investigated the effects of C4F8/O-2 and Ar/O-2 component ratios in a gas system on plasma parameters and etching kinetics for various materials. The results showed that changes in the component ratios led to nonmonotonic etching rates and different reaction probabilities. The analysis suggested that the effects on the etching mechanisms may be controlled by the flux of fluorocarbon radicals or oxygen atoms.
PLASMA PROCESSES AND POLYMERS
(2021)
Article
Chemistry, Analytical
Marco Rosenkranz, Steffen Lessny, Bernd Noecker, Steven Breakspear, Evgenia Dmitrieva
Summary: In this study, the formation and evolution of free radicals in human hair were investigated using the EPR-strain technique. The radicals formed in the hair through the cleavage of cystine residues were identified. The stability of the radicals in dry hair and in the presence of water was studied. The results showed that the evolution of sulfur radicals only occurred at strains above approximately 25%, which coincided with the Post-Yield region of the hair's stress-strain behavior.
Article
Physics, Applied
Federica Barletta, Nikolay Britun, Christophe Leys, Matteo Gherardi, Rony Snyders, Anton Nikiforov
Summary: This study investigates the key processes in an atmospheric-pressure plasma jet containing Ar and tetraethyl orthosilicate (TEOS) through imaging and fluorescence spectroscopy of important discharge radicals. It focuses on the behavior of ground-state radicals' density with respect to applied voltage and Ar/TEOS mixing ratio, providing initial insights on precursor fragmentation mechanisms. The influence of precursor admixture and fragmentation on the kinetics of OH, CH radicals, and atomic oxygen is revealed.
PLASMA PROCESSES AND POLYMERS
(2021)
Article
Physics, Atomic, Molecular & Chemical
Yunus Emre Osmanoglu, Kerem Sutcu
Summary: In this study, the ESR definition of gamma irradiated oxcarbazepine single crystals and the ESR properties of the radicals formed after irradiation were investigated at room temperature. The presence of structural defects caused by irradiation in the single crystals of oxcarbazepine was attributed to the R-1 radical through experimental and simulation methods. The g value and hyperfine splitting constants of the R-1 radical were determined through accurate simulations, and the ESR resonance signals were observed for a duration of 45 days in the experimental spectra.
APPLIED MAGNETIC RESONANCE
(2023)
Article
Chemistry, Inorganic & Nuclear
Yuma Morimoto, Shinichi Hanada, Ryusuke Kamada, Arisa Fukatsu, Hideki Sugimoto, Shinobu Itoh
Summary: The hydroxylation of cyclohexane was successfully achieved using an iron(III) complex supported by a trianionic planar tetradentate ligand, showing high turnover number and selectivity for alcohol production. The involvement of an iron(III) acyl peroxido complex as the reactive species was suggested by spectroscopic measurements, providing insight into the reaction mechanism.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Barbara Biondi, Victoria N. Syryamina, Gabriele Rocchio, Antonio Barbon, Fernando Formaggio, Claudio Toniolo, Jan Raap, Sergei A. Dzuba
Summary: Electron paramagnetic resonance spectroscopy, especially the pulse technique double electron-electron resonance (DEER), has become an extremely useful experimental tool for determining the distances between free radical side chains in molecules like polypeptides. Nitroxide electron spin labels are the most popular probes used for this purpose. In this study, the side chain mobility properties of two commonly used residues, Cys(MTSL) and TOAC, were compared in detail. It was found that the TOAC side chain labels are more structurally restricted than the MTSL labels, providing more precise information on the side chain-to-side chain distance distribution in synthetically accessible peptide molecules.
Article
Chemistry, Physical
Hiroki Hirano, Hirona Takahashi, Akio Kawai
Summary: In this study, the radical scavenging reactions of C70 were investigated and the results showed that C70 acts as an excellent radical scavenger. The relative addition reaction rate constants for different isomers were calculated and the high reactivity of fullerenes was attributed to the large number of carbon atoms in pentagons.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Physics, Atomic, Molecular & Chemical
Kerem Suetcue, Yunus Emre Osmanoglu
Summary: The radiation sensitivities of progesterone and propranolol hydrochloride samples irradiated with gamma rays in the 0-25 kGy dose range were investigated using electron paramagnetic resonance (EPR) spectroscopy. The microwave saturation behavior of the free radicals contributing to the spectra was found to be different, resulting in signal intensity curves obtained in the range of 0-15 mW depending on the microwave power. Dose-response curves were obtained using samples irradiated at dose values of 1, 5, 10, 15, 20, and 25 kGy, and the most appropriate mathematical functions and correlation coefficients were calculated. The stability of the free radicals formed in the irradiated samples at room temperature was tested by determining the extinction curves of the signal intensities.
APPLIED MAGNETIC RESONANCE
(2023)
Article
Physics, Applied
B. Myers, P. Ranieri, T. Smirnova, P. Hewitt, D. Peterson, M. Herrera Quesada, E. Lenker, K. Stapelmann
Summary: Plasma-generated hydroxyl radicals and oxygen atoms were investigated, revealing that the HTA assay cannot distinguish between OH radicals and atomic oxygen, leading to inaccuracies in measuring aqueous OH densities. The experiments showed the significant role of atomic oxygen in plasma-induced liquid chemistry, highlighting the need for diagnostic techniques that take this into account.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Alejandro Guerrero-Caicedo, Juan S. Pardo-Tamayo, Elkin L. Romero, Fabio Zuluaga, Luis Echegoyen, Luz M. Jaramillo-Gomez
Summary: In this article, a synthetic methodology for the construction of new cylic alkoxyamines is reported. These alkoxyamines are constituted by an indene core connected to a pyrrolidine nucleus through a spiro carbon atom, exhibiting the 1-azaspiro[4.4]nonane frame. The alkoxyamines were synthesised through a free radical-based spirocyclization, and the corresponding spirocyclic aminoxyl radicals (nitroxides) were detected in ESR spectra. Moreover, a spirocyclic alkoxyamine with an α-hydrogen was found to be effective as an initiator/mediator in the styrene bulk homopolymerization.
Article
Physics, Applied
Martin Weiss, Raphael Utz, Michael Ackermann, Florin-Andrei Taran, Bernhard Kraemer, Markus Hahn, Diethelm Wallwiener, Sara Brucker, Michael Haupt, Jakob Barz, Christian Oehr
PLASMA PROCESSES AND POLYMERS
(2019)
Article
Nanoscience & Nanotechnology
Martin Weiss, Jakob Barz, Michael Ackermann, Raphael Utz, Aya Ghoul, Klaus-Dieter Weltmann, Matthias B. Stope, Diethelm Wallwiener, Katja Schenke-Layland, Christian Oehr, Sara Brucker, Peter Loskill
ACS APPLIED MATERIALS & INTERFACES
(2019)
Article
Physics, Applied
Jakob Barz, Michael Haupt, Christian Oehr, Thomas Hirth, Philipp Grimmer
PLASMA PROCESSES AND POLYMERS
(2019)
Article
Engineering, Biomedical
Claudia Kleinhans, Lena Schmohl, Jakob Barz, Petra J. Kluger
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
(2020)
Article
Chemistry, Analytical
Sebastian Micus, Ivan Kirsten, Michael Haupt, Goetz T. Gresser
Article
Oncology
Lukas Feil, Andre Koch, Raphael Utz, Michael Ackermann, Jakob Barz, Matthias Stope, Bernhard Kraemer, Diethelm Wallwiener, Sara Y. Brucker, Martin Weiss
Article
Chemistry, Analytical
Sebastian Micus, Michael Haupt, Goetz T. Gresser
Summary: This study utilizes ultrasonic soldering to connect E-textiles to PCBs, aiming to improve connection strength and mechanical performance by adjusting the operating temperature and ultrasonic time.
Article
Chemistry, Multidisciplinary
Valerie Bartsch, Volkmar von Arnim, Sven Kuijpens, Michael Haupt, Thomas Stegmaier, Goetz T. Gresser
Summary: The study aimed to print new polymer dispersions containing layered silicates as coatings to protect smart textiles. By determining appropriate printing parameters, conductive structures with high abrasion resistance and continuous protective layers were successfully printed.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Sebastian Micus, Laura Padani, Michael Haupt, Gotz T. Gresser
Summary: Researchers developed and evaluated textile-based inductive coils for near-field wireless power transmission, exploring methods for attaching conductive materials, producing coils, and examining their quality characteristics.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Gerd Reichardt, Manuel Henn, Paul Reichle, Georg Umlauf, Kim Riedmueller, Rudolf Weber, Jakob Barz, Mathias Liewald, Thomas Graf, Guenter E. M. Tovar
Summary: In the deep drawing process, lubricants are essential to prevent wear and surface damage, but traditional options pose environmental and health risks, leading to research on a new system using liquid carbon dioxide and nitrogen gas introduced through micro-holes. Further investigations are focused on the lubrication medium's impact on tool wear.
Article
Oncology
Julia Marzi, Matthias B. Stope, Melanie Henes, Andre Koch, Thomas Wenzel, Myriam Holl, Shannon L. Layland, Felix Neis, Hans Boesmueller, Felix Ruoff, Markus Templin, Bernhard Kraemer, Annette Staebler, Jakob Barz, Daniel A. Carvajal Berrio, Markus Enderle, Peter M. Loskill, Sara Y. Brucker, Katja Schenke-Layland, Martin Weiss
Summary: The study characterized the use of noninvasive physical plasma (NIPP) as a treatment for cervical intraepithelial neoplasia (CIN) and conducted a prospective trial, which showed a success rate of 95% in treating CIN1/2 patients with NIPP without significant post-intervention complications.
Proceedings Paper
Metallurgy & Metallurgical Engineering
Gerd Reichardt, Manuel Henn, Paul Reichle, Daniel Hemming, Georg Umlauf, Kim Riedmuller, Rudolf Weber, Jakob Barz, Mathias Liewald, Thomas Graf, Gunter E. M. Tovar
Summary: Traditional lubricants used in deep-drawing processes may contain harmful substances, but volatile lubricants, such as CO2 or N2, offer a solution to this issue. By injecting volatile media under high pressure into the friction zone, these lubricants help separate the tool from the metal surface.
TMS 2021 150TH ANNUAL MEETING & EXHIBITION SUPPLEMENTAL PROCEEDINGS
(2021)
Article
Engineering, Manufacturing
Ehsan Zahedi, Christoph Woerz, Gerd Reichardt, Georg Umlauf, Mathias Liewald, Jakob Barz, Rudolf Weber, Daniel J. Foerster, Thomas Graf
MANUFACTURING REVIEW
(2019)
