Article
Chemistry, Analytical
Hideo Utsumi, Toshiki Masumizu, Ryoma Kobayashi, Tomoko Tahira, Fuminori Hyodo, Tatsuya Shimizu, Tatsuya Naganuma, Kazunori Anzai
Summary: Free radicals are key substances in organisms but can also cause oxidative diseases. Dynamic nuclear polarization- magnetic resonance imaging is a noninvasive imaging method that can be used for in vivo free radical imaging.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Toshinobu Nakajo, Jun Kumagai, Shinpei Kusaka, Akihiro Hori, Yuh Hijikata, Jenny Pirillo, Yunsheng Ma, Ryotaro Matsuda
Summary: Triplet carbenes (TCs) are highly reactive species with unique electronic states, making it challenging to balance reactivity and stability. By confining TCs in the nanospace of a metal-organic framework (MOF), it is possible to enhance their thermal stability while maintaining reactivity, allowing for the stabilization of highly reactive species.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Inorganic & Nuclear
Anthony J. Campanella, Manh-Thuong Nguyen, Jun Zhang, Thacien Ngendahimana, William E. Antholine, Gareth R. Eaton, Sandra S. Eaton, Vassiliki-Alexandra Glezakou, Joseph M. Zadrozny
Summary: This work investigates how variations in ligand structures affect the EPR spectroscopic properties of five Cr(III) complexes, indicating that the spectral broadening is correlated to rigidity in the inner coordination sphere and reflected in ligand-dependent distribution of Cr-N bond distances.
DALTON TRANSACTIONS
(2021)
Article
Multidisciplinary Sciences
Juvinch R. Vicente, Amanda Durkin, Kristina Shrestha, Mihaela Balu
Summary: Melanin plays a significant role in skin homeostasis and protection. The two-photon excited fluorescence lifetime detection method allows for selective and quantitative measurement of melanin. Previous studies lacked consideration of skin heterogeneity due to limited field of view. In this work, a fast large-area multiphoton exoscope was used to evaluate the 3D distribution of epidermal melanin content, improving measurement reliability.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
S. A. Rodriguez, S. S. Gomez, J. Fernandez-Rossier, A. Ferron
Summary: Electron-spin resonance carried out with scanning tunneling microscopes (ESR-STM) is a recently developed experimental technique that is attracting enormous interest on account of its potential to carry out single-spin on-surface resonance with subatomic resolution. In this theoretical study, we investigate the role of tip-adatom interactions in order to optimize spin resonance measurements. We provide guidelines for optimizing the tip-sample distance to cancel the effective magnetic field created by the tip on the surface spin, for reducing the voltage dependence of the surface-spin resonance frequency, and for inferring the detuning angle between the applied field and the tip magnetization.
Article
Physics, Applied
T. D. Gustafson, N. C. Giles, B. C. Holloway, C. A. Lenyk, J. Jesenovec, J. S. McCloy, M. D. McCluskey, L. E. Halliburton
Summary: In this study, electron paramagnetic resonance (EPR) and optical absorption were used to characterize Cu2+ and Cu3+ ions in Cu-doped beta-Ga2O3. Different EPR spectra and optical absorption bands were observed for Cu2+ and Cu3+ ions. The results showed that Cu2+(A) ions occupy defect-free octahedral Ga sites, while Cu2+(B) ions have adjacent defects, possibly OH- ions, oxygen vacancies, or H- ions trapped within oxygen vacancies. Additionally, exposure of the crystals to 275 nm light at room temperature produced Cu3+ ions and reduced the number of Cu2+(A) and Cu2+(B) ions. Thermal annealing studies showed that Cu3+ ions decay, and Cu2+ ions recover.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Ameen Uddin Ammar, Ipek Deniz Yildirim, Mohamad Hasan Aleinawi, Merve Buldu-Akturk, Nur Selin Turhan, Shankari Nadupalli, Arpad Mihai Rostas, Emre Erdem
Summary: The doping of Mn, Fe, and Cu ions into ZnO nanocrystals adds magnetic phenomena to their semiconducting property. However, there is a lack of research on the local lattice structure, spin-exchange phenomena, and interaction between defects and doped metal ions in TM ion-doped ZnO. This study uses multi-frequency (EPR) techniques to investigate ZnO:TM, revealing the localization of the dopant ion, site symmetry, and the formation of intrinsic-extrinsic defect complexes. The incorporation of TM ions modifies the intrinsic defect structure of ZnO nanocrystals, with the appearance of peculiar spin-exchange phenomena from intrinsic-extrinsic defect complexes, and charge selective substitutions in the matrix are observed for Cu2+ compared to Mn2+ and Fe3+.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Multidisciplinary
Santina S. Cruz, Vadim Tanygin, Benjamin J. Lear
Summary: Using electron spin resonance spectroscopy, it has been demonstrated that morphological asymmetries in small spheroidal metallic nanoparticles significantly affect the electronic behavior of states near the metal's Fermi energy. The study found that morphological effects were more important than size distributions in explaining the asymmetry in electronic behavior, and this was consistent across various particles made from different metals. Additionally, the study also showed that morphological changes can tune the electronic properties of even small particles, as evidenced by the modeling used to explain asymmetries in both electron spin resonance spectra and plasmon spectra.
Article
Chemistry, Physical
Constantinos Moularas, Pavlos Psathas, Yiannis Deligiannakis
Summary: The study utilizes electron paramagnetic resonance to distinguish the characteristics of photo-generated carriers in 14 nm and 26 nm NaTaO3 particles. The 14 nm particles exhibit higher photoinduced carrier yield, while the 26 nm particles show lower photoinduced carrier yield.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Medicinal
Riccardo Carloni, Natalia Sanz del Olmo, Barbara Canonico, Mariele Montanari, Caterina Ciacci, Gianluca Ambrosi, F. Javier de la Mata, Maria Francesca Ottaviani, Sandra Garcia-Gallego
Summary: The study revealed the significant impact of meta-position iminopyridine substituents on the antitumor activity of carbosilane metallodendrimers. New Cu(II) carbosilane metallodendrimers with methyl or methoxy substituents demonstrated low micromolar IC50 values in tumor cell lines, and in vitro assays indicated improved cytotoxicity and selectivity. The most promising candidates exhibited a substantial increase in antitumor activity in U937 tumor cells, possibly through different ROS-production pathways.
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Tian Tian, Yuheng Chen, Jie Zhang, Shuolin Wang, Wen Yuan, Hongde Liu, Yaoqing Chu, Chengling Mao, Wenjie Xu, Dahuai Zheng, Jiayue Xu
Summary: A series of uranium-doped lithium niobate crystals (LN:U) were grown by the modified vertical Bridgman method, and their photorefractive properties in the visible band were systematically investigated for the first time. The occupancy of uranium ions and photorefractive centers is discussed. LN:U achieves multi-wavelength holography.
Article
Chemistry, Inorganic & Nuclear
Molly M. Lockart, Kyle C. Edwards, John B. Vincent, Brad S. Pierce
Summary: The study detected an EPR signal for Mn(III) bound to transferrin, suggesting the six-coordinate nature of the Mn(III) centers in an elongated tetragonal environment. Incorporation of Mn(III) within the Tf active site did not significantly alter the coordination number or active site geometry compared to native Fe(III)(2)-Tf. The parallel mode EPR signal for Mn(III)(2)-Tf could be valuable for future studies on the physiological relevance of Mn(III)(2)-Tf.
Article
Physics, Applied
T. D. Gustafson, N. C. Giles, B. C. Holloway, J. Jesenovec, B. L. Dutton, J. S. McCloy, M. D. McCluskey, L. E. Halliburton
Summary: Transition-metal ions form deep acceptor levels in β-Ga2O3 crystals. This study characterizes the Ni acceptors and their properties, and identifies the presence of other ions. Different experimental techniques are used to monitor and analyze the behavior and characteristics of these ions.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
M. Y. Ruan, Z. L. Guo, Q. C. Luo, L. Wang, X. L. Wei, T. Y. Li
Summary: We investigated the size effect on the magnetocaloric effect (MCE) of Er2BaNiO5, a Haldane spin-chain antiferromagnet. The results showed that the decrease in average crystallite size led to an enhancement of magnetization and paramagnetic-like behavior. The dominant antiferromagnetic (AFM) interactions in the bulk sample were suppressed in the nano-size samples, resulting in a dramatic reduction of the Haldane gap. Additionally, the size effect significantly influenced the MCE, leading to a monotonic increase in MCE in the nano-size samples compared to the disappearance of negative MCE in the bulk sample. The maximum entropy change of the nano-size samples increased nearly 3.2 times compared to the bulk sample. The ESR results confirmed the increasing of paramagnetic (PM) ions in the nano-size samples, as evidenced by the observed ESR signals of Er3+ and Ni2+ ions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nuclear Science & Technology
Hyojin Kim, Jae Seok Kim, Byeong Ryong Park, Seongjae Jang, Han-Ki Jang, Ki-Taek Han, Hoon Choi, Jeongin Kim, In Jung Kim, Yunho Kim, Wi-Ho Ha, Jungil Lee, Yeong-Rok Kang
Summary: The Korea retrospective dosimetry (KREDOS)-electron paramagnetic resonance (EPR) group conducted an intercomparison investigation using hydroxyapatite. The analysis involved four institutions and assessed the proficiency of each laboratory. The results demonstrated satisfactory ratings and efforts are being made to optimize the dosimetry systems.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2023)
Article
Physics, Atomic, Molecular & Chemical
Maria A. Augustyniak-Jablokow, Ryhor Fedaruk, Roman Strzelczyk, Lukasz Majchrzycki
APPLIED MAGNETIC RESONANCE
(2019)
Article
Geography, Physical
Zuzanna Kabacinska, Ryszard Krzyminiewski, Krzysztof Tadyszak, Emerson Coy
QUATERNARY GEOCHRONOLOGY
(2019)
Article
Chemistry, Physical
Blazej Scheibe, Krzysztof Tadyszak, Marcin Jarek, Natalia Michalak, Mateusz Kempinski, Mikolaj Lewandowski, Barbara Peplinska, Katarzyna Chybczynska
APPLIED SURFACE SCIENCE
(2019)
Article
Chemistry, Physical
Maria A. Augustyniak-Jablokow, Krzysztof Tadyszak, Roman Strzelczyk, Ryhor Fedaruk, Raanan Carmieli
Article
Materials Science, Multidisciplinary
Krzysztof Tadyszak, Katarzyna Chybczynska, Pawel Lawniczak, Alina Zalewska, Bogumil Cieniek, Michak Gonet, Marek Murias
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2019)
Article
Engineering, Biomedical
Jacek K. Wychowaniec, Jagoda Litowczenko, Krzysztof Tadyszak
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
Krzysztof Tadyszak, Jagoda Litowczenko, Lukasz Majchrzycki, Pawel Jezowski, Karol Zaleski, Blazej Scheibe
MATERIALS CHEMISTRY AND PHYSICS
(2020)
Article
Chemistry, Multidisciplinary
Krzysztof Tadyszak, Andrzej Musial, Adam Ostrowski, Jacek K. Wychowaniec
Article
Chemistry, Multidisciplinary
Krzysztof Tadyszak, Jacek K. Wychowaniec, Karol Zaleski, Emerson Coy, Lukasz Majchrzycki, Raanan Carmieli
Article
Engineering, Biomedical
Jacek K. Wychowaniec, Jagoda Litowczenko, Krzysztof Tadyszak, Varun Natu, Claudia Aparicio, Barbara Peplinska, Michel W. Barsoum, Michal Otyepka, Blazej Scheibe
ACTA BIOMATERIALIA
(2020)
Article
Chemistry, Physical
Maria A. Augustyniak-Jablokow, Roman Strzelczyk, Ryhor Fedaruk
Article
Chemistry, Physical
Maria A. Augustyniak-Jablokow, Raanan Carmieli, Roman Strzelczyk, Ryhor Fedaruk, Krzysztof Tadyszak
Summary: The hydrothermal reduction process of graphene oxide produces partly reduced graphene oxide with oxygen groups and paramagnetic centers (PCs) from magnetic defects. Two types of PCs with different relaxation times are observed at low temperatures, with only the ones with shorter T-1 and Tm persisting above 20 K. The temperature dependence of PCs and their distribution reveal lattice distortions and structural disorder in the prGO product.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Roman Strzelczyk, Maria A. Augustyniak-Jablokow, Ryhor Fedaruk, Lukasz Majchrzycki, Joanna Zwolinska, Olga Kazakova
Summary: The intrinsic ferromagnetism in graphene oxide is related to the zigzag edges created during the exfoliation process, with spin-flip transitions of protons from hydroxyl groups enhancing spin fluctuations. This results in superferromagnetism below a specific temperature range, with residual ferromagnetism observed in GO paper due to surviving magnetic moments in closed pores.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Krzysztof Tadyszak, Beata Wereszczynska, Michal Gonet
SOLID STATE SCIENCES
(2020)
