Article
Materials Science, Ceramics
Seema, Naveen Kumar, Subhash Chand
Summary: In this study, Fe-doped TiO2 nanoparticles were synthesized using the sol-gel method, and the effects of Fe3+ ion substitution on the structural, phase transformation, morphological, optical, and dielectric properties of TiO2 nanocrystals were investigated. The results showed that Fe-doping led to a decrease in crystallite size, an improvement in photo-absorption behavior, and a decrease in relative dielectric constant.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Xu Dan, Li Ruiyi, Wang Qinsheng, Yang Yongqiang, Wang Guangli, Li Zaijun
Summary: The study demonstrated the synthesis of silver nanocrystals using histidine-functionalized graphene quantum dots, leading to enhanced catalytic activity with improved exposure of high-index facets. The resulting silver/histidine-functionalized graphene quantum dots were utilized for colorimetric detection of D-penicillamine, showing high sensitivity, selectivity, and stability. The proposed method offers a promising approach for the synthesis of metal nanocrystals with excellent catalytic activity.
MICROCHEMICAL JOURNAL
(2021)
Review
Nutrition & Dietetics
Mohamed Abuelazm, Shoaib Muhammad, Mohamed Gamal, Fatma Labieb, Mostafa Atef Amin, Basel Abdelazeem, James Robert Brasic
Summary: Vitamin D shows conflicting efficacy in treating IBS, with no significant difference in improving IBS-SSS, but favoring improvement in IBS-QoL and serum 25(OH)D levels over placebo.
Article
Chemistry, Analytical
M. Serif Cansever, Nevin Oztekin, Ertugrul Kiykim, Tanyel Zuebarioglu, Ayse Cigdem Aktuglu Zeybek
Summary: This study developed a simple and fast capillary electrophoresis system combined with capacitively coupled contactless conductivity detection method for the separation and determination of D- and L-2-hydroxyglutaric acid in urine.
JOURNAL OF SEPARATION SCIENCE
(2023)
Article
Neurosciences
Corinna Koehnke, Markus Herrmann, Klaus Berger
Summary: This study found that patients with depression have lower levels of vitamin D, especially those with atypical depression. The severity of symptoms is inversely related to vitamin D levels. These findings suggest that the subtype of depression and symptom severity may have an impact on vitamin D levels.
NUTRITIONAL NEUROSCIENCE
(2022)
Article
Materials Science, Ceramics
Liliana Gianni, Helene Renel, Aleksandar Kremenovic, Philippe Colomban
Summary: Representative 'Blue speckled' and 'Brown speckled' wares from Qalhat and Bahla in Oman were analyzed using various techniques. The study revealed differences in composition, firing temperatures, and glaze types and compositions. It is suggested that the wares were locally produced, but the origin of the glazes used in the 'Blue speckled' wares remains uncertain.
BOLETIN DE LA SOCIEDAD ESPANOLA DE CERAMICA Y VIDRIO
(2022)
Article
Chemistry, Inorganic & Nuclear
Alexandros Deltsidis, Laura Simonelli, Georgios Vailakis, Izar Capel Berdiell, Georgios Kopidakis, Anna Krzton-Maziopa, Emil S. Bozin, Alexandros Lappas
Summary: In this work, synchrotron X-ray absorption and emission spectroscopies were used to investigate the correlation between interlayer spacing and enhancement of superconducting critical temperature in the molecule-intercalated Li-x(C5H5N)(y)Fe2-zSe2. The results showed that Fe-site vacancies and the resulting local lattice modifications contribute to the improvement of superconductivity by alleviating electron-lattice correlations. This study provides insights into the doping-induced changes in the electronic and structural properties of the inorganic host.
INORGANIC CHEMISTRY
(2022)
Correction
Chemistry, Multidisciplinary
Robert J. Koch, Nikolaj Roth, Yu Liu, Oleh Ivashko, Ann-Christin Dippel, Cedomir Petrovic, Bo B. Iversen, Martin V. Zimmermann, Emil S. Bozin
ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES
(2022)
Article
Chemistry, Physical
Borislav Vasic, Rados Gajic, Ivana Milosevic, Zarko Medic, Marina Blagojev, Marko Opacic, Aleksandar Kremenovic, Dejan Lazic
Summary: Pyrophyllite is a two-dimensional mineral with a layered structure, which exhibits good friction and wear properties. It can be used for nanoscale machining and is an electrical insulator with a high breakdown voltage, indicating potential applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Crystallography
Ivana Jelic, Aleksandar Pacevski, Aleksandar Kremenovic, Ales Soster, Andreja Sestan, Janez Zavasnik
Summary: The behaviour and stability of arsenopyrite are affected by its crystal structure, but research on crystallography and structural defects is lacking. To clarify this, natural arsenopyrite crystals from the Sumadija-Kopaonik ore district in Serbia were studied using powder X-ray diffraction (XRPD). Among them, samples from the Drenjak gold mineralisation showed near-stoichiometric FeAsS composition and were further examined using conventional and high-resolution transmission electron microscopy. The microscopy revealed the presence of abundant planar crystallographic defects and the formation of an epitaxial surface oxide layer upon air exposure. This study provides important insights into the structure and environmental stability of arsenopyrite, as well as its role in anthropogenic arsenic release into the environment.
Article
Chemistry, Inorganic & Nuclear
Marija Suljagic, Ivan Petronijevic, Miljana M. Mirkovic, Aleksandar Kremenovic, Adis Dzunuzovic, Vladimir B. Pavlovic, Aleksandra Kalezic-Glisovic, Ljubica Andjelkovic
Summary: The influence of spinel structure and sintering temperature on the functional properties of BaTiO3/NixZn1-xFe2O4 was investigated. NiFe2O4, ZnFe2O4, and Ni0.5Zn0.5Fe2O4 were prepared onto BaTiO3 surface by in situ thermal decomposition and then sintered at 1150°C and 1300°C. X-ray powder diffraction and scanning electron microscopy were used to examine the phase composition and morphology. The magnetic, dielectric, and ferroelectric properties were investigated. The BaTiO3/NiFe2O4 composite sintered at 1150°C exhibited wide frequency range stability and favorable properties, making it an ideal choice for further studies on multi-ferroic device applications.
Article
Chemistry, Multidisciplinary
Ana F. Suzana, Sizhan Liu, Jiecheng Diao, Longlong Wu, Tadesse A. Assefa, Milinda Abeykoon, Ross Harder, Wonsuk Cha, Emil S. Bozin, Ian K. Robinson
Summary: When synthesized under certain conditions, barium titanate (BTO) nanoparticles show a non-thermodynamic cubic structure and have an enhanced dielectric constant. These nanoparticles are widely used in thin-layer capacitors. Characterization methods, including X-ray refinement and the Williamson-Hall approach, reveal the presence of notable strain associated with the cubic phase. However, X-ray pair distribution function measurements indicate a lower symmetry local structure.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Philippe Colomban
Summary: A didactic review of vibrational spectroscopy procedures for studying mobile protonic species in solid hydrates, crystals and ceramics is proposed. Representative examples of materials are given, and the advantages of isotopic substitution and dilution measurements are discussed. The vibrational signatures of different proton species and the characterization of protonic species without or with weak vibrational signatures are presented. The presence of a strong incoherent inelastic neutron scattering background appears to be characteristic of proton conductors.
SOLID STATE IONICS
(2023)
Article
Materials Science, Ceramics
Philippe Colomban, Gulsu Simsek Franci, Jacques Burlot, Xavier Gallet, Bing Zhao, Jean-Baptiste Clais
Summary: On-site pXRF analysis is conducted on French collections of decorated porcelains from the Qing Dynasty to identify enamel types, ions and coloring phases, as well as differentiate between Chinese/Asian raw materials and those imported by European missionaries. The study focuses on cobalt-associated elements, impurities in the silicate matrix, and the use of gold or copper nanoparticles. Comparisons are made with previous measurements on Qing imperial porcelains, Cantonese productions, and blue-and-white wares from different museums and collections.
CERAMICS-SWITZERLAND
(2023)
Article
Spectroscopy
Jacques Burlot, Divine Vangu, Ludovic Bellot-Gurlet, Philippe Colomban
Summary: This study analyzes the yellow pigments of enameled objects from 18th century French and Chinese productions and identifies different types of Raman signatures. The combination of spectral decomposition parameters and PCA analysis proves effective in categorizing the pigments.
JOURNAL OF RAMAN SPECTROSCOPY
(2023)
Article
Spectroscopy
Jacques Burlot, Divine Vangu, Ludovic Bellot-Gurlet, Philippe Colomban
Summary: Raman analysis is utilized to study the phases observed in the different colored enamels of French and Chinese objects from the 18th century. The effectiveness of a solid-state spectroscopic approach and a multivariate chemometric approach is compared. The incorporation of spectra from similar phases in the literature is crucial for obtaining quality results. The combination of visual observation and multivariate analysis reveals that different production techniques result in variations in the peaks associated with the main As-O stretching vibration. Arsenic-based opacifiers are detected in the enamelled artifacts, both in French and Chinese objects.
JOURNAL OF RAMAN SPECTROSCOPY
(2023)
Article
Geochemistry & Geophysics
Philippe Colomban, Gulsu Simsek Franci
Summary: Raw materials play a significant role in determining the composition and properties of fired ceramics. Raman analysis was used to characterize the micro- and nanostructures of glazes from various regions, revealing three different types of glazes and identifying specific color compositions. Different pigments and opacifiers were also identified. The results provide insights into the production and connection between different ceramic artifacts.
Article
Chemistry, Multidisciplinary
Naga Vishnu Vardhan Mogili, Nathalia Carolina Verissimo, A. M. Milinda Abeykoon, Emil S. Bozin, Jefferson Bettini, Edson Roberto Leite, Joao Batista Souza Junior
Summary: The local structural characterization of iron oxide nanoparticles is explored using the pair distribution function (PDF) analysis method. By pre-treating the background function, the successful implementation of the e-PDF technique is achieved to study the local structure of the considered nanomaterial.
ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
J. Sears, Y. Shen, M. J. Krogstad, H. Miao, E. S. Bozin, I. K. Robinson, G. D. Gu, R. Osborn, S. Rosenkranz, J. M. Tranquada, M. P. M. Dean
Summary: The interaction between charge density wave (CDW) and lattice plays a crucial role in La1.875Ba0.125CuO4, inducing periodic modulation of Cu-Cu spacing within the CuO2 planes and out-of-plane breathing modulation of lanthanum layers. The CDW-related structural distortions propagate through the crystal, leading to overlapping structural modulations in adjacent layers and within the same layer. This effect could facilitate the coupling of CDWs between adjacent planes.
Article
Humanities, Multidisciplinary
Philippe Colomban, Gulsu Simsek Franci, Michele Gironda, Pauline d'Abrigeon, Anne-Claire Schumacher
Summary: Raman and XRF analyses have shown that it is possible to identify specific phases and elements used in ceramics made with European recipes and ingredients. The study focused on ceramics produced in the Forbidden City during the Qing Dynasty and in Guangzhou, and found that they used the same raw materials. The study also observed some artifacts with anachronistic characteristics that suggest they were produced around 1850.
