Article
Chemistry, Multidisciplinary
D-Y Park, N. Myung
Summary: CoPt and CoPtP thin films were synthesized by direct current aqueous electrodeposition from weak alkaline solutions. The composition of the films was adjusted by varying electrodeposition parameters, resulting in different microstructures and magnetic properties.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Alexander Hildebrandt, Eduard Kovalski, Marcus Korb
Summary: The synthesis of a platinum alkynyl compound was achieved, and the study found that the feedback from platinum to the pi-system influenced the redox processes, leading to multiple oxidation reactions. Spectroelectrochemical studies revealed a high degree of delocalization in the ligand, while direct electron transfer through platinum was not observed.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Analytical
Mustafa Erkovan, Caner Deger, Susana Cardoso, Necmettin Kilinc
Summary: This study investigates the feasibility of using Pt and PtCo alloy ultrathin films as hydrogen gas sensors to reduce costs. The hydrogen-sensing properties of the ultrathin films are evaluated, and the results show that PtCo alloy films have better response time compared to pure Pt films, but lower sensor response.
Article
Physics, Multidisciplinary
Chun-Qiang Xu, Yi Liu, Wei Zhou, Jia-Jia Feng, Sen-Wei Liu, Yu-Xing Zhou, Hao-Bo Wang, Zhi-Da Han, Bin Qian, Xue-Fan Jiang, Xiao-Feng Xu, Wei Ye, Zhi-Xiang Shi, Xiang-Lin Ke, Pabitra-Kumar Biswas
Summary: The study reports the superconducting properties of noncentrosymmetric compounds TaxRe1-x, with a maximum superconducting transition temperature of around 8 K at the optimal level of x=0.15. However, muon-spin rotation and relaxation measurements reveal no time-reversal symmetry breaking in its superconducting state, contrasting with both centrosymmetric Re metal and many other noncentrosymmetric Re-based superconductors.
CHINESE PHYSICS LETTERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Takuto Mibu, Atsushi Iba, Yusaku Suenaga, Takashi Okubo, Masahiko Maekawa, Takayoshi Kuroda-Sowa, Kunihisa Sugimoto
Summary: Two types of mononuclear cobalt complexes were synthesized with ancillary ligands containing isoquinoline groups and 3,5-di-tert-butylcatechol. The steric effect of quinoline derivatives around the cobalt center was compared with complexes containing multiple quinoline groups. The electronic states of the complexes were influenced by the substituents on the ancillary ligands from various perspectives such as spectroscopic, electrochemical, and magnetic properties.
INORGANICA CHIMICA ACTA
(2021)
Article
Electrochemistry
Marilya Palmeira Galdino da Silva, Anna Caroline Lima Candido, Joao Xavier de Araujo-Junior, Anielle Christine Almeida Silva, Noelio Oliveira Dantas, Thiago Mendonca de Aquino, Fabiane Caxico de Abreu
Summary: This study presents the interaction results of the molecule LQM10 with nanocarriers (CoFe2O4 MNPs and PAMAM G3), demonstrating the potential application of nanotechnology in the research of bioactive substances and the possible anticancer effects that could be achieved through magnetic hyperthermia therapy.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2021)
Article
Chemistry, Physical
Zhiling Zhao, Eunkyoung Kim, Dana Motabar, William E. Bentley, Gregory F. Payne
Summary: Redox bioelectronics utilizes electrochemical methods to connect with biology's native redox modality, which involves electron exchange through redox reactions. This study explores electrodes coated with redox-active but non-conducting catechol-containing hydrogels, which are emerging as important materials in redox-based bioelectronics. By increasing the dimensionality of dynamic optical measurements and employing a deterministic network model, the researchers reveal the intrinsic structure of the additional data, enhancing their capabilities for signal detection and interpretation in redox-based bioelectronics.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
A. Andalouci, Y. Roussigne, L. Gangloff, P. Legagneux, S. Farhat, S. M. Cherif
Summary: In this study, vertically aligned multiwalled carbon nanotubes (MWCNTs) filled with Co magnetic nanowires were synthesized in a one-step process using bias-assisted plasma enhanced chemical vapor deposition (PECVD) method. The growth, alignment, and filling of the carbon nanotubes were achieved simultaneously by applying a negative bias to the substrate. The structural investigations revealed the growth mechanisms, and the analysis confirmed the presence of Co, Pd, C, N, and O in the nanotubes. The hysteresis cycles exhibited ferromagnetic behavior, with higher coercive field values observed for nail-shaped Co nanoparticles embedded in the CNTs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Qi-Jun Yao, Fan-Rui Huang, Jia-Hao Chen, Ming-Yu Zhong, Bing-feng Shi
Summary: In recent years, the merging of electrosynthesis with 3d metal catalyzed C-H activation has been developed as an effective technique in organic synthesis. However, an enantioselective version of this technique is still challenging. This study presents the first electrooxidative cobalt-catalyzed enantioselective C-H/N-H annulation with olefins at room temperature. The mechanism of the reaction was elucidated through cyclovoltametric studies and the preparation of cobaltacycle intermediates.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Electrical & Electronic
Kanchan Kumari, Rajesh Kumar, Partha Bir Barman
Summary: Cobalt ferrite films were grown using a solution method in the presence of a magnetic field, and the study revealed that the magnetic field influences both the crystallite size and magnetic properties of the films.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Abdalaziz Aljabour, Houssein Awada, Luyang Song, He Sun, Simon Offenthaler, Farzaneh Yari, Matthias Bechmann, Markus Clark Scharber, Wolfgang Schoefberger
Summary: In this study, the trimetallic cobalt(II) triazole pyridine bis-[cobalt(III) corrole] complex (CoTP)-T-II[(CoC)-C-III](2)3 is explored for its application in OER and ORR catalysis. The complex exhibits remarkable physicochemical properties, fast charge transfer kinetics, electrochemical reversibility, and durability. It shows nearly 100% selective catalytic activity towards the two-electron transfer generated H2O2, with an ORR onset potential of 0.8 V vs RHE and a cycling stability of 50,000 cycles.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Biomedical
Alexander R. Harris
Summary: The study on Utah electrodes helps understand electrochemical behavior and influencing factors on performance. Platinum and iridium electrodes exhibit different oxidation properties and charge transfer mechanisms. Electrode geometry and material significantly impact performance.
JOURNAL OF NEURAL ENGINEERING
(2021)
Article
Chemistry, Physical
Thomas Dippong, Mihaela Diana Lazar, Iosif Grigore Deac, Petru Palade, Ioan Petean, Gheorghe Borodi, Oana Cadar
Summary: This study investigates the effect of Mn2+ substitution for Co2+ in CoFe2O4 embedded in a SiO2 matrix on the structural, surface, morphological, and magnetic properties. With an increase in Mn content, particle size increases and magnetic properties change accordingly. The mesoporous structure facilitates the release of fine nanoparticles in aqueous environment.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
I. S. B. Ferraz, T. J. Castro, J. Mantilla, J. A. H. Coaquira, V. K. Garg, A. C. Oliveira, A. Franco Jr, P. C. Morais, S. W. da Silva
Summary: Aluminum-substituted cobalt ferrite nanoparticles synthesized by combustion reaction method exhibit excellent structural and property characteristics, making them promising candidates for applications in stress sensors, actuators, and magnetostrictive filters.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Akmal Johan, Dedi Setiabudidaya, Fitri Suryani Arsyad, Ramlan, Wisnu Ari Adi
Summary: This research investigates the effect of La3+ dopant ion on the reflection loss characteristics of cobalt zinc ferrite. The samples were synthesized through solid state reaction followed by sintering, and their particle morphology, elemental composition, and magnetic properties were analyzed. The presence of Zn in the cobalt ferrite structure determines the ferromagnetic strength, and the optimum composition was found to exhibit significant microwave absorption at specific frequencies.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Biochemical Research Methods
Jernej Ekar, Peter Panjan, Sandra Drev, Janez Kovac
Summary: The study investigated the influence of flooding gas during ToF-SIMS depth profiling to reduce matrix effects and improve the quality of depth profiles. The application of different atmospheres during SIMS depth profiling improved the results.
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
(2022)
Article
Energy & Fuels
Kristijan Brecl, Marko Jost, Matevz Bokalic, Jernej Ekar, Janez Kovac, Marko Topic
Summary: The research shows that perovskite solar cells exhibit high PID resistance under +/-500 V bias, but rapid degradation is observed with -1000 V bias due to the ingress of sodium ions. Positively biased devices show no degradation under high voltage exposure, indicating promising signs for current PV system designs.
Article
Chemistry, Multidisciplinary
Francesco Ghezzi, Matteo Pedroni, Janez Kovac, Federica Causa, Anna Cremona, Mariano Anderle, Roberto Caniello, Silvia M. Pietralunga, Espedito Vassallo
Summary: This study investigates the deep texturization process of crystalline silicon surfaces and its applications, proposing a cost-effective method for large-area production through maskless texturization. The mechanism of surface self-nanopatterning is revealed by analyzing the physical chemistry of the etching process at the nanoscale, shedding light on the evolution of surface morphology and the onset of erosion.
Article
Chemistry, Multidisciplinary
Jernej Ekar, Janez Kovac
Summary: The influence of H2 flooding on the surface roughness development during ToF-SIMS depth profiling was studied. It was found that in certain cases, the increase in roughness was lower when sputtering in a H2 atmosphere compared to an ultrahigh vacuum (UHV) environment. Additionally, sputtering with a 1 keV Cs+ beam might have a smoothing effect on the initially rough surfaces.
Article
Chemistry, Multidisciplinary
Marina M. Maletic, Ana M. Kalijadis, Vladimir Lazovic, SneZana Trifunovic, Biljana M. Babic, Alesandra Dapcevic, Janez Kovac, Marija M. Vukcevic
Summary: N-doped TiO2/carbon composites with different nitrogen content were prepared and characterized. It was found that N doping improved the adsorption capacity but decreased the photocatalytic efficiency. However, TiO2/CN0.05 composite obtained under specific conditions showed high efficiency in removing pollutants.
JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Luka Suhadolnik, Marjan Bele, Miha Cekada, Primoz Jovanovic, Nik Maselj, Anja Loncar, Goran Drazic, Martin Sala, Nejc Hodnik, Janez Kovac, Tiziano Montini, Michele Melchionna, Paolo Fornasiero
Summary: A versatile approach for producing cluster- and single atom-based thin-film electrode composites is described in this article. The TiOxNy-Ir catalyst developed in this study was prepared from sputtered Ti-Ir alloy with 0.8 +/- 0.2 at % Ir in alpha-Ti solid solution. The prepared catalyst exhibited high oxygen evolution reaction activity and has potential applications in electrocatalysis. The article provides a detailed description of the new method and a high-performance thin film catalyst, along with suggestions for future development in this field.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Stanislav Campelj, Matic Pobreznik, Tomas Landovsky, Janez Kovac, Layla Martin-Samos, Vera Hamplova, Darja Lisjak
Summary: In this study, MNPs were successfully functionalized with CAT, GAL, CAF, and NDA at different pH values. The functionalized MNPs showed higher saturation magnetizations (M-s) compared to the starting material. XPS analyses confirmed the presence of Fe(III) ions on the surface, ruling out the formation of magnetite. DFT calculations demonstrated that the adsorption of catechols did not affect the M-s. The increase in the average size of the MNPs and the decrease in the fraction of the smallest MNPs explained the observed increase in M-s values.
Article
Crystallography
Monika Kuster, Janez Kovac, Zoran Samardzija, Matej Komelj, Sorour Semsari Parapari, Matejka Podlogar, Jean-Marie Dubois, Saso Sturm
Summary: Super-hydrophobic surfaces and coatings have been extensively studied to improve wetting properties. The time dependence of the oxide layer and surface adsorbates on the surface topography of an Al59Cu25Fe13B3 quasicrystalline material were analyzed in relation to changes in wettability. The study found that the growth of the oxide layer and surface roughness have an impact on the wetting behavior of the material.
Article
Infectious Diseases
Zoran M. Markovic, Aleksandra S. Misovic, Danica Z. Zmejkoski, Nemanja M. Zdravkovic, Janez Kovac, Danica V. Bajuk-Bogdanovic, Dusan D. Milivojevic, Marija M. Mojsin, Milena J. Stevanovic, Vladimir B. Pavlovic, Biljana M. Todorovic Markovic
Summary: Developing new medicines for infectious diseases is currently a major challenge. Carbon quantum dots, a new member of the carbon nanomaterials family, show potential as visible-light-triggered antibacterial agents. This study investigates the antibacterial and cytotoxic activities of gamma-ray-irradiated carbon quantum dots, finding that they have antibacterial activity and are non-toxic to human cells.
Article
Nanoscience & Nanotechnology
Marjan Bele, Gorazd Koderman Podborsek, Anja Loncar, Primoz Jovanovic, Armin Hrnjic, Ziva Marinko, Janez Kovac, Angelja Kjara Surca, Ana Rebeka Kamscek, Goran Drazic, Nejc Hodnik, Luka Suhadolnik
Summary: Introducing the Nano Lab, a novel experimental platform aimed at accelerating the discovery and understanding of promising electrocatalysts. It enables state-of-the-art physicochemical characterization and atomic-scale tracking of individual synthesis steps as well as subsequent electrochemical treatments targeting nanostructured composites. The platform's compatibility with ex situ characterization and other analytical methods allows for a comprehensive understanding of structural changes and their effects.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Hsin-Chia Ho, Milutin Smiljanic, Zoran Jovanovic, Miha Cekada, Janez Kovac, Gertjan Koster, Jiri Hlinka, Nejc Hodnik, Matjaz Spreitzer
Summary: This study developed a robust photocathode using low-cost and high-performing materials, such as p-Si, for efficient and durable production of clean fuel hydrogen. The utilization of pulsed laser deposition (PLD) technique and a buffer layer of reduced graphene oxide (rGO) allowed for the preparation of a high-quality SrTiO3 (STO) layer that passivates the p-Si substrate. The study demonstrated that the epitaxial STO layer on rGO-buffered Si provided the highest onset potential and improved charge separation and transfer compared to counterparts with thicker or nonepitaxial STO layers. The importance of having a well-defined passivation layer and the stability of the epitaxial STO layer in corrosion resistance was also highlighted.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Ziga Jelen, Janez Kovac, Rebeka Rudolf
Summary: This study successfully conjugated SARS-CoV-2 S1 spike protein fragments with gold nanoparticles (AuNPs) synthesized with Ultrasonic Spray Pyrolysis (USP). The conjugation mechanism was investigated and confirmed through gel electrophoresis and X-ray Photoelectron Spectroscopy analysis. The study highlights the potential use of AuNPs synthesized with USP as sensors in colorimetric or electrochemical sensors and LFIA tests.
Article
Nanoscience & Nanotechnology
Niharika Rawat, Metka Bencina, Domen Paul, Janez Kovac, Katja Lakota, Polona Zigon, Veronika Kralj-Iglic, Hsin-Chia Ho, Marija Vukomanovicc, Ales Iglic, Ita Junkar
Summary: Cardiovascular diseases are a major cause of death globally. Existing cardiovascular stents often lead to restenosis and thrombosis, highlighting the need for superior biomaterials. This study investigated two surface treatment procedures to optimize the surface properties of titanium medical implants and assessed their biological responses. The findings indicate the significant influence of surface treatment on cell interactions, offering insights for designing multifunctional biomaterial surfaces that promote specific cell types' proliferation, which is crucial for the advancement of vascular implants.
ACS APPLIED BIO MATERIALS
(2023)
Article
Chemistry, Analytical
Jaka Olenik, Vasyl Shvalya, Martina Modic, Jernej Ekar, Janez Kovac, Uros Cvelbar, James L. Walsh
Summary: Fourier transform infrared spectroscopy (FTIR) is commonly used to study gas-phase reactive oxygen and nitrogen species (RONS). However, the presence of interfering peaks in spectral data poses challenges. This study investigates the interaction between reactive oxygen and nitrogen species generated by a non-equilibrium air plasma and the metal halide windows of an FTIR gas cell, leading to the appearance of spurious absorption peaks. Various spectroscopic techniques were employed to determine the origin of these peaks and it was found that KBr exposed to plasma showed a lower fraction of bromine and the formation of NO3 nitrate group. The evolution of these absorption peaks affected the window transparency and was correlated with KNO3 formation, plasma power, and exposure time.
JOURNAL OF ANALYSIS AND TESTING
(2023)
Article
Chemistry, Multidisciplinary
Vesna Ribic, Vanja Jordan, Sandra Drev, Janez Kovac, Goran Drazic, Aleksander Recnik
Summary: Water interaction with mineral surfaces is crucial for photocatalytic processes. This study investigates the atomistic structure, atomic structure, and surface chemistry of fibrous rutile TiO2 in the presence of water. The results show that the specific interface structure can induce acidic response in a neutral medium.
ADVANCED MATERIALS
(2023)
