Article
Chemistry, Physical
Vijeta Tanwar, Sitender Singh, Isha Gupta, Pawan Kumar, Harish Kumar, Bernabe Mari, Devender Singh
Summary: Eu(III)-activated Forsterite nanophosphors were synthesized using sol-gel technique. The structural and phase purity of the materials were characterized by XRD and FT-IR studies. The nanophosphors exhibited aggregated particles with sizes ranging from 50 to 80 nm. The materials showed efficient excitation under UV light and emitted red fluorescence at 613 nm. The optical properties were analyzed using J-O analysis, which revealed the influence of covalent character and structural environment on the properties. The nanophosphors demonstrated bright red color, making them suitable for optoelectronic applications.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Optics
Pankaj Gupta, Mohit Sahni, Sunil Chauhan
Summary: This study focuses on the synthesis of rare earth doped Y0.50Gd0.45RE0.05BO3 and their impact on photoluminescence properties, with results showing that doped samples exhibit a monophasic nature and lattice parameter increases with Gd content.
Article
Materials Science, Ceramics
N. Dehingia, P. Gogoi, P. Dutta
Summary: AgNP-doped Eu SiO2 glasses were prepared by the sol-gel method with fixed Eu3+ and varying Ag concentrations. The effects of AgNPs on the radiative properties of Eu3+ in SiO2 matrix were studied by absorption and photoluminescence spectroscopy, with various radiative parameters calculated using Judd Ofelt theory. The observed enhancement in absorption and emission intensities of Eu3+ ions were attributed to the enhanced local field near AgNPs and their network-modifying role.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
K. M. S. Dawngliana, A. L. Fanai, S. Rai
Summary: Sm3+ doped SiO2:TiO2 nanocomposite glass-ceramic was synthesized using sol-gel technique and its physical, structural, and optical properties were investigated. Parameters such as refractive index, density, and polarizability were measured and listed for the prepared glass material. XRD, ATR-FTIR, and TEM were used to study the structure of the material, and confirmed the presence of TiO2 nanocrystals. Radiative parameters were estimated using the Judd-Ofelt parameters, and the CIE 1931 chromaticity diagram demonstrated the color purity of the synthesized materials, which was enhanced by Sm3+ ion addition.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Ceramics
Lj Dacanin Far, A. Ciric, Z. Ristic, J. Perisa, T. Dramicanin, S. R. Lukic-Petrovic, M. D. Dramicanin
Summary: Y3NbO7:Eu3+ powders were synthesized and characterized, revealing concentration quenching of the luminescence when the Eu3+ concentration exceeds 3%. Multipolar interaction was predicted as the dominant mechanism. The powder exhibits strong orange/red luminescence and high intrinsic quantum yield.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
K. T. Lee, P. Poopalan
Summary: A new type of red phosphor was developed by doping Eu3+ in BaTiO3 sol-gel ultra-thin film, showing excellent optical performance for applications in WLEDs and lasers.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Optics
M. Mangala Gowri, H. Nagabhushana
Summary: Nd3+-activated Y2SiO5 nanopowders were synthesized via sonochemical method. Characterization techniques including PXRD, SEM, TEM, DRS, and TL were utilized to analyze the obtained product. The energy band gap values were determined to be 5.17-5.81 eV for X1 phase NPs and 4.96-5.71 eV for X2 phase NPs. The TL response of YSO:Nd3+ (at 5 mol% concentration) showed the highest intensity when irradiated with 4 kGy gamma-ray radiation.
JOURNAL OF LUMINESCENCE
(2023)
Article
Optics
N. Rajkonwar, P. Gogoi, D. Kakoti, N. Dehingia, A. Boruah, S. P. Bharadwaj, P. Dutta
Summary: Eu3+ singly doped and Eu3+ co-doped with ligands PPIA and TOPO in silica matrix were fabricated via sol-gel route and investigated by structural and spectroscopic techniques. The addition of ligands significantly improved the radiative efficiency of Eu3+ and showed excellent radiative behavior. Therefore, the Eu3+ co-doped sol-gel silica matrix with PPIA and TOPO could be a potential candidate for optical device applications.
JOURNAL OF LUMINESCENCE
(2022)
Review
Materials Science, Ceramics
K. M. S. Dawngliana, S. Rai
Summary: This paper reports on the investigations of Sm3+ co-doped alumino-silicate glass synthesized by the sol-gel method for its linear and nonlinear optical characteristics. Structural characterization was performed using XRD and FTIR techniques, and the absorption spectra exhibit multiple peaks in the UV-VIS & NIR region. Photoluminescence emissions and color tunability were observed under different conditions.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Optics
Nimitha S. Prabhu, Nirmal Mazumder, Suresh Bhardwaj, R. J. Choudhary, U. Caldino, A. N. Meza-Rocha, M. I. Sayyed, Dalal Abdullah Aloraini, Aljawhara H. Almuqrin, Sudha D. Kamath
Summary: A BaO-ZnO-LiF-B2O3 glass system containing Sm3+ was synthesized and its structural, thermal, dielectric, optical, and radiative properties were studied. The results showed the potential of this glass system for solid-state lasers and emission device applications.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Mei-Hong Liu, Jia-Min Liu, Feng Chen, De-Long Zhang
Summary: The study shows that Omega(t) mainly depends on strong and medium-intensity transitions, which must all be included in the fit to obtain accurate results. Additionally, Omega(t) changes almost linearly with the IAC or IACS of an individual transition, with the linear slope depending on the size of the [U-(t)](2) value. Furthermore, Omega(2), Omega(4) and Omega(6) are interdependent due to their relationship with the n-ary summation Omega(t)[U-(t)](2).
Article
Chemistry, Inorganic & Nuclear
Anuj Dalal, Kapeesha Nehra, Anjli Hooda, Sitender Singh, Shri Bhagwan, Devender Singh, Sumit Kumar
Summary: This study reports the synthesis and photoluminescence performance of a series of heteroleptic europium complexes with fluorinated chromophoric ligand and 2,2'-bipyridine or their derivatives as ancillary ligand. The structure and photoluminescence properties of the synthesized complexes were analyzed using various spectroscopic techniques. The experimental and theoretical results from LUMPAC software show that the prepared complexes exhibit red emissive nature and can be used as red light emitting materials in various display devices.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Mei-Hong Liu, Jia-Min Liu, Feng Chen, De-Long Zhang
Summary: The dependence of Judd-Ofelt intensity parameters and their relative ratios on the overall changing factor of integrated absorption bands of Er3+ has been studied. The linear feature changes between different materials, and the relative ratios show significant changes in smaller q regions due to the presence of the magnetic-dipole oscillator. To obtain precise Omega(t) values using the relevant method, a large enough q value is necessary, which can be achieved by using a thin powder plate with low Er3+ concentration for spectral measurement.
Article
Optics
El Mahdi Bouabdalli, Mohamed El Jouad, Nathalie Gaumer, Samira Touhtouh, Abdelowahed Hajjaji
Summary: This study focuses on exploring the effect of europium doping on the structural, physical, and optical properties of silicophosphate glasses. Pure and europium-doped glasses were synthesized using the sol-gel method, and their structural and optical properties were analyzed. The results show that europium doping leads to a reduction in network dimensionality, an increase in band gap energy, and red emission suitable for laser applications.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
R. Divina, P. Evangelin Teresa, K. Marimuthu
Summary: A series of Dy3+ ions doped alkali lead bismuth borate glasses with different modifiers were synthesized and analyzed for their potential in photonic applications. Structural differences in the host network were shown when different modifiers were introduced. The glasses exhibited amorphous nature and absorption of Dy3+ ions to different excited states.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Danielle C. Baldini, Emerson H. de Faria, Katia J. Ciuffi, Lucas A. Rocha, Eduardo Jose Nassar
Summary: This study investigated the upconversion mechanism by doping erbium and ytterbium lanthanide ions into titanium oxide, using sol-gel methodology and spin-coating technique to prepare thin films. The films showed good optical transparency and exhibited distinct erbium ion emission spectra after thermal treatment.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Maria Gabriela Martins de Souza, Jessica Potomatti Batista, Emerson Henrique de Faria, Katia Jorge Ciuffi, Lucas Alonso Rocha, Eduardo Jose Nassar, Jorge Vicente Lopes da Silva, Marcelo Fernandes Oliveira, Izaque Alves Maia
Summary: To meet market and societal demands, the development of structured polymeric materials for medical applications is continually increasing. Metallic silver nanoparticles have been extensively explored for their antimicrobial properties. In this study, chemical methods were used to incorporate metallic silver nanoparticles into polymeric pieces obtained through additive manufacturing. The nanoparticles were successfully incorporated into the polymeric material and demonstrated interactions with the polyamide 12 nitrogen groups. These polymeric membranes containing metallic silver nanoparticles show promising potential for biomedical applications such as antimicrobial wound dressings and drug carriers.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Helena Brunckova, Lucas Alonso Rocha, Eduardo Jose Nassar, Susane Bonamin Moscardini, Hristo Kolev
Summary: Thin films of lanthanide orthoniobate LnNbO(4) and orthotantalate LnTaO(4) (Ln = Nd, Sm, Eu) were successfully fabricated using the sol-gel method and exhibited excellent luminescence properties, making them promising candidates for applications in sensors and imaging equipment.
Article
Chemistry, Physical
Jessica Yasmin de Morais Pinos, Leticia Barbosa de Melo, Suelen Delfino de Souza, Liziane Marcal, Emerson Henrique de Faria
Summary: This study evaluates the efficiency of surfactant-modified bentonite with amine groups in removing nickel and rhodamine-B from wastewaters. The modified bentonite showed high adsorption capacity and followed pseudo-second-order kinetics for both contaminants.
APPLIED CLAY SCIENCE
(2022)
Article
Materials Science, Ceramics
Vicente Vargas, Anastasiya Sedova, Jesus Uriel Balderas, S. Carmona-Tellez, Ivan Merlin, Lucas Rocha, Ciro Falcony
Summary: The luminescent characteristics of spherical hafnia/silica (HfO2/SiO2) nanoparticles co-doped with Tb3+/Yb3+ were analyzed. SiO2 and Tb3+/Yb3+ were found to induce a cubic phase in HfO2. The luminescent spectra showed characteristic emissions from Tb3+ and Yb3+ ions with excitation at 270 nm. Under solid-state laser excitation at 980 nm, upconversion emissions related to Tb3+ were observed. Energy transfer efficiency from Tb3+ to Yb3+ was determined to be in the range of 29.2% to 40.8% based on luminescence intensity analysis and time decay.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Chemical
L. Santamaria, L. Oliveira Garcia, E. H. De Faria, K. J. Ciuffi, M. A. Vicente, S. A. Korili, A. Gil
Summary: Aluminum was extracted from saline slags and utilized in the synthesis of Layered Double Hydroxides (LDH) with different metal cations. The samples were structurally characterized and their catalytic performance and biomimetic potential were tested. Results showed high selectivity of the samples towards epoxides.
MINERALS ENGINEERING
(2022)
Article
Chemistry, Analytical
Luzio G. Bocalon, Marcos G. Tozatti, Ana H. Januario, Patricia M. Pauletti, Marcio L. A. Silva, Lucas A. Rocha, Eduardo F. Molina, Mario F. C. Santos, Wilson R. Cunha
Summary: Drug delivery systems are technologies that have been extensively studied and applied to enhance the application of existing drugs and improve the bioavailability of compounds of interest. This study successfully incorporated betulinic acid (BA) into mesoporous silica materials and investigated the characteristics and release mechanisms of the nanoparticles. The results demonstrate the potential use of these nanoparticles in drug delivery systems.
ANALYTICAL LETTERS
(2023)
Article
Chemistry, Physical
F. C. Clementino, V. G. Peixoto, D. T. de Araujo, K. J. Ciuffi, E. J. Nassar, M. A. Vicente, V. Rives, E. H. de Faria
Summary: In this study, solid materials were prepared by kaolinite functionalization with pyridine 2-carboxylic and pyridine 2,6-dicarboxylic acids, and europium (III) ions were complexed on these solids. The obtained luminescent materials were characterized and evaluated for their potential applications as luminescent sensors. The results showed that the samples functionalized with picolinic and dipicolinic acids exhibited high quantum efficiencies. In the contaminant adsorption tests, the solid material with picolinic acid demonstrated better detection efficiency for chromium (III) in a low concentration range compared to the one with dipicolinic acid.
APPLIED CLAY SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Lidia Resende Oliveira, Eduardo Jose Nassar, Hernane da Silva Barud, Jhonatan Miguel Silva, Lucas Alonso Rocha
Summary: Organic-inorganic composites have many potential commercial applications due to their combination of the chemical and thermal stability of inorganic oxides and the processability and flexibility of organic compounds and polymers.
Article
Chemistry, Physical
Adrian Gil-Korilis, Mihail Cojocaru, Melibea Berzosa, Carlos Gamazo, Natalia J. Andrade, Katia J. Ciuffi
Summary: This study focused on the synthesis of silver nanoparticles and their antibacterial activity. The use of nitric acid to adjust the pH during synthesis produced larger and more varied particle sizes. The silver nanoparticles were successfully loaded onto clay minerals and exhibited strong antibacterial effects. Additionally, the cytotoxicity of the silver-loaded samples was found to be low.
APPLIED CLAY SCIENCE
(2023)
Article
Engineering, Chemical
Omar Jose de Lima, Denis Talarico de Araujo, Liziane Marcal, Antonio Eduardo Miller Crotti, Guilherme Sippel Machado, Shirley Nakagaki, Emerson Henrique de Faria, Katia Jorge Ciuffi
Summary: In recent decades, the use of pesticides in agriculture has caused environmental contamination. To address this issue, researchers have developed a new method to prepare zinc photocatalysts for the treatment of agricultural effluents. The study showed that zinc-aluminophosphate treated at 750 degrees Celsius exhibited excellent photocatalytic degradation performance for the pesticide Fipronil.
Article
Chemistry, Multidisciplinary
Daniel Aparecido Pires, Henrique Jose da Silva, Lucas Alonso Rocha, Eduardo Jose Nassar
Summary: This article introduces a simple portable system based on the Peltier principle for spectral characterization of compounds with temperature-dependent structure. The device is constructed and adapted to different equipment and evaluated using commercial thermochromatic inks, demonstrating its characterization performance under temperature changes.
Review
Engineering, Environmental
A. Gil, L. Santamaria, S. A. Korili, M. A. Vicente, L. V. Barbosa, S. D. de Souza, L. Marcal, E. H. de Faria, K. J. Ciuffi
Summary: Clay minerals serve as an important platform for the development of novel functional materials, with focus on amino-functionalized clays for their simplicity and efficiency in adsorbing various water and gaseous contaminants.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)