Article
Chemistry, Inorganic & Nuclear
Nadezhda V. Shchipalkina, Oleg S. Vereshchagin, Nikita V. Chukanov, Liudmila A. Gorelova, Vladimir N. Bocharov, Igor V. Pekov
Summary: In situ single-crystal X-ray diffraction and Raman spectroscopy were used to study the rare mineral sapozhnikovite Na8(Al6Si6O24)(HS)2 with a sodalite-type crystal structure. The research revealed reversible phase transitions, drastic changes in thermal expansion coefficients, and non-elastic behavior of the sapozhnikovite framework. Raman spectroscopy demonstrated partial transformations of the extra-framework anions and the restoration of the HS- anion after heat treatment. The orange luminescence of Na8(Al6Si6O24)(HS)2 remained stable up to 1073 K.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Chemistry, Applied
Takeshi Kaneda, Taiji Matsumoto, Yujiro Watanabe
Summary: A sodalite material with Na8[Al6Si6O24](I,S)2 composition was synthesized from zeolite A using hydrothermal reaction of mixed solution of sodium iodide and sodium sulfide. The obtained samples were white in color, but turned blue or yellow after calcination. Blue color was obtained at 700-800 degrees C due to formation of S3- color centers, while samples calcined at 900 and 1000 degrees C turned yellow due to the formation of I2 molecules. The yellow specimen prepared at 7.5 times the stoichiometric ratio of NaI showed the largest b* value in CIELAB color space, indicating a blue-yellow component.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Materials Science, Ceramics
M. Milanova, L. Aleksandrov, A. Yordanova, R. Iordanova, N. S. Tagiara, A. Herrmann, G. Gao, L. Wondraczek, E. I. Kamitsos
Summary: The structure and luminescence properties of glasses with compositions 50ZnO:40B2O3:10WO3:xEu2O3, 0 <= x <= 10 mol% were studied using infrared, Raman and photoluminescence spectroscopic techniques. The physical properties of the glasses were also determined. The results indicate the efficiency of the 50ZnO:40B2O3:10WO3 glass structure for the luminescence performance of doped Eu3+ and suggest that these glasses are potential materials for red emission.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Multidisciplinary
Ahmed A. Gawad, Tarek M. Salama, Islam Ibrahim, Mohamed Meshref, Gehad G. Mohamed, Abdallah F. Zedan
Summary: This study introduces a hybrid spectroscopic and chromatography approach to investigate the infrared luminescence (IRL) behavior of blue ballpoint (BP) pen inks. Through various analytical techniques, it is revealed that the presence of crystal violet and other triaryl methane dyes is responsible for IRL in some ink samples. Additionally, the inclusion of phthalocyanine dye results in luminescence quenching in non-luminescent ink samples due to spectral overlap.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
Toru Katsumata, Yumemi Kano, Takashi Honda, Haruka Naito, Shuji Komuro, Hiroaki Aizawa
Summary: The temperature dependence of photoluminescence from Ti doped sapphire crystals peaking at 725 nm was evaluated for a fluorescence thermometry application. PL intensity decreased with increasing temperatures from 20 to 250 °C. 2-D PL images showed a linear decrease in brightness with temperature, similar to the PL peak intensity.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
L. -Q. Zheng, S. Yang, S. Krahenbuhl, V. V. Rybkin, J. Lan, I. Aprahamian, R. Zenobi
Summary: The effect of carbon chain length on the photoisomerization of hydrazone switches was investigated. It was found that the conversion efficiency of isomerization increases with longer alkyl chains. Strong quenching by the metal surface limits the isomerization efficiency of C3 HAT. Computational results provide insights into the mechanism of the surface quenching effect, and the previously proposed substrate-mediated isomerization mechanism was validated.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Ben Yang, Gong Chen, Atif Ghafoor, Yu-Fan Zhang, Xian-Biao Zhang, Hang Li, Xiao-Ru Dong, Rui-Pu Wang, Yang Zhang, Yao Zhang, Zhen-Chao Dong
Summary: We investigated the chemical effects on Raman signals in surface enhanced Raman spectroscopy (SERS) through tip-enhanced Raman spectroscopy (TERS) of a single planar ZnPc molecule with controlled contact environments. TERS signals were enhanced when a tip-molecule point contact was made, due to the generation of a ground-state charge-transfer induced vertical Raman polarizability and the strong vertical plasmonic field in the nanocavity. However, TERS signals were quenched when ZnPc was chemisorbed flatly on substrates, attributed to the Raman polarizability screening effect induced by interfacial dynamic charge transfer.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Satish A. Ture, Veerabhadragouda B. Patil, Channabasaveshwar V. Yelamaggad, Ramon Martinez-Manez, Venkataraman Abbaraju
Summary: Understanding the mechanism of detection is crucial in selecting a suitable fluorophore for the detection of nitroaromatic and non-aromatic high energy materials (HEMs). Conducting polymers, specifically functionalized polyaniline, have shown significance in fluorescence quenching studies. Electrochemical methods help in establishing the probable mechanism associated with the sensing study of HEMs, while FTIR and resonance Raman characterization aid in understanding the interaction between nitro groups and polyaniline.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Biochemistry & Molecular Biology
Sabina Botti, Francesca Bonfigli, Valentina Nigro, Alessandro Rufoloni, Angelo Vannozzi
Summary: Micro-Raman and luminescence spectroscopy, combined with morphological analysis, were used to study the conservation state of degraded paper samples. Raman and fluorescence spectra were acquired by scanning non-printed areas and maps were built to visualize the degradation pattern. Complementary information on paper morphology and surface compactness were obtained by high-resolution microscopy. This non-destructive procedure is important for the analysis and evaluation of restoration treatments of precious and ancient samples.
Article
Chemistry, Inorganic & Nuclear
S. Kabadou, J. Horcheni, F. Mselmi, A. Kabadou, E. Dhahri, L. Bessais
Summary: The polycrystalline ZrTe3O8:2%Er, 3%Mn material was prepared using solid-state reaction technique, and it exhibited a cubic phase structure with two types of polyhedrons. The Raman spectrum revealed the asymmetric stretching vibration of the Te-O-2-Zr bridges, and the magnetic results showed weak ferromagnetic behavior at low temperature. Additionally, the ZrTe3O8:2%Er, 3%Mn material showed significant emission in the visible and near-infrared range when excited at 490 nm, making it suitable for W-LED applications.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Li Wu, Shaojun Sun, Yuxing Bai, Zhiguo Xia, Liwei Wu, Huimin Chen, Lirong Zheng, Huan Yi, Tongqing Sun, Yongfa Kong, Yi Zhang, Jingjun Xu
Summary: This study demonstrates the combination of self-reduction behavior of doped activators and zero-thermal-quenching luminescence in a Mn2+ activated red phosphor, and clarifies the self-reduction mechanism and anti-thermal quenching effect. The unique properties are attributed to cation vacancy defects and thermally induced energy transfer, suggesting potential for developing novel high thermal stability phosphors.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Materials Science, Ceramics
Khaldoon Nasser, Vladimir Aseev, Alexander Ignatiev, Nikolay Nikonorov
Summary: A new chloride photo-thermo-refractive glass doped with ytterbium ions has been developed, showing good spectroscopic and luminescent properties for laser and gain applications. The study analyzed the dependence of optical and spectral-luminescent characteristics on ytterbium concentration and determined the optimum concentration of ytterbium ions in the glass. Results also included important spectroscopic parameters obtained through measurements and theoretical approaches.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Analytical
Angelos G. Kalampounias
Summary: The study used Raman spectroscopy to investigate the dynamic interactions between acrylonitrile and carbon tetrachloride in solutions. By analyzing the spectra and time correlation functions, a comprehensive understanding of vibrational frequency modulation and dephasing was achieved. The study revealed a strong dependence of vibrational relaxation on the local environment around the acrylonitrile species in solutions with carbon tetrachloride, with variations observed in the second moments of vibrations implying an interplay between repulsive and attractive forces acting on monomeric and self-associated species in solution environment.
VIBRATIONAL SPECTROSCOPY
(2021)
Article
Optics
R. T. Alves, C. M. Trindade, N. O. Dantas, A. S. Gouveia-Neto, A. C. A. Silva
Summary: In this study, the structural and optical properties of zinc tellurite glasses doped with various rare earth ions were investigated using Raman spectroscopy. The results showed that the addition of rare earth ions led to changes in the glass structure and affected the luminescent properties.
JOURNAL OF LUMINESCENCE
(2022)
Article
Optics
R. T. Alves, A. C. A. Silva, N. O. Dantas, A. S. Gouveia-Neto
Summary: The study investigated the structural and optical properties of zinc tellurite glass matrices doped with Tm3+ and Dy3+, revealing changes in frequency and intensity of structural units and vibrational modes due to chemical composition and rare earth ion doping. Analysis showed the importance of structural disorder in the luminescent properties of the glass matrices, with energy transfer mechanism observed in matrices doped with Dy3+ and codoped with Tm3+/Dy3+ by varying Dy3+ concentration.
JOURNAL OF LUMINESCENCE
(2021)
Article
Mineralogy
Ian E. Grey, Rupert Hochleitner, Christian Rewitzer, Alan Riboldi-Tunnicliffe, Anthony R. Kampf, Colin M. MacRae, W. Gus Mumme, Melanie Kaliwoda, Henrik Friis, Carlos U. Martin
MINERALOGICAL MAGAZINE
(2020)
Article
Mineralogy
Fabrice Dal Bo, Emil Holtung Gulbransen, Henrik Friis
Summary: A nomenclature scheme has been established for the nordite supergroup of minerals, which have the formula A(2)BXYZT(6)O(17). Different dominant elements at the A, B or X sites require new rootnames. The classification of minerals is based on the dominant element on the tetrahedral Z site.
MINERALOGICAL MAGAZINE
(2021)
Article
Mineralogy
Nikita Chukanov, Gerhard Moehn, Fabrice Dal Bo, Natalia Zubkova, Dmitry A. Varlamov, Igor Pekov, Laurent Jouffret, Jean-Marc Henot, Pascal Chollet, Yannick Vessely, Henrik Friis, Dmitry A. Ksenofontov, Atali A. Agakhanov, Sergey N. Britvin, Joy Desor, Natalia N. Koshlyakova, Dmitry Yu Pushcharovsky
Summary: The new beudantite-group mineral oberwolfachite, with ideal composition SrFe33+(AsO4)(SO4)(OH)(6), was discovered in Germany and France. It forms yellow to brown platy crystals and is associated with quartz, baryte, and other minerals.
MINERALOGICAL MAGAZINE
(2021)
Article
Mineralogy
Fabrice Dal Bo, Henrik Friis, Stuart J. Mills
Summary: A nomenclature and classification scheme for wohlerite-group minerals has been established. The main structural feature of these minerals is the four-columns-wide octahedral walls. Different combinations of X and W constituents should be considered as separate mineral species. Wohlerite-group minerals can easily form crystals with different crystal structures and chemical compositions.
MINERALOGICAL MAGAZINE
(2022)
Article
Mineralogy
Emil H. Gulbransen, Henrik Friis, Fabrice Dal Bo, Muriel Erambert
Summary: A new mineral, illoqite-(Ce), has been discovered in quartz-vein pegmatites, occurring as individual crystals or radiating aggregates. It belongs to the nordite supergroup and is named after the Greenlandic word "illoq", meaning cousin.
MINERALOGICAL MAGAZINE
(2022)
Article
Multidisciplinary Sciences
Lene L. Delsett, Henrik Friis, Martina Koelbl-Ebert, Jorn H. Hurum
Summary: This study describes two new ichthyosaur specimens, one nearly complete and one isolated tail. Analysis of the samples confirms the presence of apatite in the soft tissue, with phosphate most likely derived from the ichthyosaur itself.
Article
Mineralogy
Inna Lykova, Ralph Rowe, Glenn Poirier, Henrik Friis, Kate Helwig
Summary: The new mineral Bounahasite was discovered in the oxidation zone of the Bou Nahas Mine in Morocco. It forms pseudo hexagonal plates and its crystal structure is based on two alternating coplanar sheets.
MINERALOGICAL MAGAZINE
(2022)
Article
Geosciences, Multidisciplinary
N. Rosing-Schow, R. L. Romer, A. Mueller, F. Corfu, R. Skoda, H. Friis
Summary: Most pegmatites in southern Norway are not highly evolved residual melts derived from granites, but rather formed from anatectic melting of metamorphic rocks during the Sveconorwegian orogeny. New age data for thirteen pegmatites and one granite support this hypothesis, showing two age groups of Sveconorwegian pegmatites: Group 1 (1100-1030 Ma) and Group 2 (930-890 Ma). The age difference between pegmatites and adjacent granites, as well as field evidence, suggests an anatectic origin for these pegmatites.
PRECAMBRIAN RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Nicola J. Horsburgh, Adrian A. Finch, Henrik Friis
Summary: Fluorite is a common mineral with economic importance, showing strong UV-excited luminescence attributed to defects and lanthanide substitutions. This study characterized natural fluorite samples and found that broad UV bands are caused by electronic defects, while sharp emissions are from energy cascades in trivalent lanthanides. Lanthanides substitute for Ca2+ in fluorite, balance charge with interstitial ions, and cluster into lanthanide-rich domains at high concentrations, resulting in shorter bond distances and decreased emission intensity.
PHYSICS AND CHEMISTRY OF MINERALS
(2023)
Article
Mineralogy
Inna Lykova, Ralph Rowe, Glenn Poirier, Henrik Friis, Kate Helwig
Summary: The new mineral alicewilsonite-(YCe) is found in Quebec, Canada and Russia. It has various crystal habits and colors, with a hardness of 3 and is optically biaxial. Its chemical composition is Na2Sr2YCe(CO3)(6)center dot 3H(2)O and crystal structure belongs to the weloganite type.
EUROPEAN JOURNAL OF MINERALOGY
(2023)
Article
Mineralogy
Inna Lykova, Ralph Rowe, Glenn Poirier, Gerald Giester, Kelsie Ojaste, Henrik Friis
Summary: The mckelveyite group, consisting of seven carbonate minerals, has been formally established. The minerals have the general formula A3B3(CO3)6 . 3H(2)O, with different order-disorder modifications resulting in minerals with different crystal structures. Re-examination of donnayite-(Y) type specimens reveals the presence of donnayite-(Y) and alicewilsonite-(YCe) as two different species. Donnayite-(Y) has a weloganite-type structure, confirming its classification in the mckelveyite group.
EUROPEAN JOURNAL OF MINERALOGY
(2023)
Article
Chemistry, Multidisciplinary
Elif S. Koksal, Inga Poldsalu, Henrik Friis, Stephen J. Mojzsis, Martin Bizzarro, Irep Gozen
Summary: This study demonstrates that lipids present on natural surfaces of early Earth and Mars can spontaneously organize and transform, leading to the autonomous formation of protocells. These protocells are capable of encapsulating RNA and DNA, as well as performing non-enzymatic chemical reactions.
Article
Mineralogy
Aaron J. Lussier, Joel D. Grice, Henrik Friis, Glenn G. Poirier
Summary: This study provides a detailed characterization of serandite, schizolite, and pectolite crystals, revealing a specific order of distribution for Ca and Mn across the crystal structure. The calculation of a distribution coefficient for the two sites, along with the method proposed for accurately determining the species based solely on compositional data, offers valuable insights into the compositional variations in these minerals.
CANADIAN MINERALOGIST
(2021)
Article
Mineralogy
Inna Lykova, Ralph Rowe, Glenn Poirier, Kate Helwig, Henrik Friis
MINERALOGICAL MAGAZINE
(2020)
Article
Mineralogy
Paula C. Piilonen, Henrik Friis, Ralph Rowe, Glenn Poirier
CANADIAN MINERALOGIST
(2020)