Article
Chemistry, Multidisciplinary
Amina Bakhtiar, Zohra Bouberka, Pascal Roussel, Christophe Volkringer, Ahmed Addad, Baghdad Ouddane, Christel Pierlot, Ulrich Maschke
Summary: A clay-based TiO2 nanocomposite material with high efficiency in heterogeneous photocatalysis was synthesized using a sol-gel method. The material exhibited a large specific surface area and could be reused without loss of efficiency, showing a relatively quick dye purification rate.
Article
Polymer Science
Georgiana Mladin, Mihaela Ciopec, Adina Negrea, Narcis Duteanu, Petru Negrea, Paula Svera (m. Ianasi), Catalin Ianasi
Summary: In recent years, the discharge of harmful metallic ions, including selenium, from industrial wastes into water bodies has raised concerns. Selenium is an essential microelement for human life and plays a vital role in human metabolism. The present study focuses on using the sol-gel synthesis method to prepare a nanocomposite adsorbent material for selenite adsorption.
Article
Environmental Sciences
C. S. Yue, G. B. Teh, P. Y. Wong, K. A. Ng, J. Liew, S. M. Tan
Summary: Strontium ferrite nanoparticles were prepared and characterized. The results showed that the nanoparticles were formed above 600 degrees C and mainly existed as M-type SrFe12O19 nanoparticles. Cu(II) adsorption onto the nanoparticles followed the Langmuir isotherm model and pseudo-second-order, indicating a potential adsorption mechanism involving both chemical and physical adsorptions at different stages.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Polymer Science
Yuheng Guo, Haiyan Li, Shouqiang Li, Leilei Chen, Zhenhai Li
Summary: This study prepared Zn-doped YIG nanoparticles by the sol-gel method and explored the effect and mechanism of Zn ion doping on the crystal structure, peak intensity, and magnetic properties of YIG. The results provide important theoretical support for the application of YIG devices in microwave and high-temperature fields.
Article
Materials Science, Ceramics
Andrada Ioana Damian-Buda, Georgeta Voicu, Bogdan Stefan Vasile, Adela Banciu, Florin Iordache, Lucian Toma Ciocan
Summary: In this study, mesoporous bioactive glass nanoparticles (MBGNs) were successfully synthesized using a microemulsion assisted sol-gel method, showing good bioactivity and biocompatibility in vitro. Samples containing MgO increased cell viability, while MBGNs with ZnO exhibited higher antibacterial activity against Escherichia coli.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Physical
Jefferson A. Lopes Matias, Evanimek B. Sabino da Silva, Rafael A. Raimundo, Djalma Ribeiro da Silva, Joao B. L. Oliveira, Marco A. Morales
Summary: Nanocrystalline Co sillenite-Co3O4 composites were prepared by combustion and sol-gel methods, and further characterized by various techniques. The sillenite phase exhibited nanostructured with similar content in products from both synthesis methods, showing both ferromagnetic and antiferromagnetic properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Dawei Shi, Mengqi Ye, Liang Zhao, Chao Fu, Menqiu Zheng, Xianfeng Xu, Lisha Xu, Jiyu Fan
Summary: The La0.88Sr0.12MnO3 nanocrystalline, synthesized by sol-gel chemical method, undergoes a typical paramagnetic-ferromagnetic phase transition at 280 K. Critical behavior analysis of magnetization isotherms using various techniques confirms accurate critical exponents (β = 0.5936(2) and γ = 1.0928(6)). These exponents satisfy the Widom scaling relation δ = 1 + γ/β and the single scaling equation of H/M-δ = h(ε/H-1/β). The slight deviation of the obtained critical exponents from theoretical values is attributed to the inherent disorder effect caused by the reduction of La0.88Sr0.12MnO3 particle size to the nanoscale.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Anithadevi Sekar, Ramanan Vadivel, Ramanujam Ganesh Munuswamy, Rakhi Yadav
Summary: The study introduces a new fingerprint visualizing agent, the biocompatible zinc oxide-carbon dots/silica gel (C-ZnO-dots/Si) nanopowder, which is low-cost and non-toxic. Results show that the synthesized nanopowder performs well in LF identification and can extract features of Level 1-3.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Physical
A. Bouzayen, A. Elghoul, A. Krichene, N. Chniba Boudjada, W. Boujelben
Summary: This study investigates the structural, magnetic properties, and the influence of sintering temperature on the magnetocaloric properties of La0.75Eu0.05Sr0.2MnO3 manganese. X-ray diffraction analysis reveals the coexistence of rhombohedral and orthorhombic structural phases. Reducing the sintering temperature leads to a decrease in grain size and a slight shift in Curie temperature. The magnetic behavior is explained by the core-shell structure, and decreasing the sintering temperature broadens the magnetic transition. The sample sintered at 800 degrees C exhibits the highest relative cooling power, suggesting its potential for magnetic refrigeration at room temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Inorganic & Nuclear
P. G. R. Achary, Priyabrata Pattanaik, Binita Nanda
Summary: La0.15Sr0.85MnO3 (LSMO) manganite was synthesized using sol-gel auto combustion technique and characterized by structural and TEM analyses. The electrical and photocatalytic properties of LSMO were investigated, and it was found to be a suitable photocatalyst for visible light range. Additionally, superoxide radical was identified as the effective species for the decolorization of MG.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Lena Meyniel, Cedric Boissiere, Natacha Krins, Sophie Carenco
Summary: In this study, thin films of lanthanide oxysulfide were developed that are compatible with flexible substrates and retain the robustness advantages of inorganic compounds. The films, made using a low-temperature dip coating method, maintained the optical quality of the materials. The thickness of the films could be adjusted in a wide range, and thermal treatment was optimized to remove organic ligands while preserving the integrity of the nanoparticles.
Article
Materials Science, Multidisciplinary
Majdi Benamara, Nassim Zahmouli, Afef Kallekh, Souhir Bouzidi, Lassaad El Mir, Hatem R. Alamri, Manuel Almeida Valente
Summary: In this study, gamma-Fe2O3 magnetic nanoparticles were prepared by the sol-gel method and doped with Magnesium (Mg), Gadolinium (Gd), and Cobalt (Co) oxides to enhance their magnetic properties. X-ray diffraction analysis showed that all samples had a cubic crystal structure with P4332 space group. TEM investigations revealed that the average nanoparticle sizes ranged from 15 to 23 nm for both pure and doped samples. The measurements of magnetization as a function of temperature and magnetic field demonstrated that the highest magnetization (MH) of the nanoparticles increased with increasing concentrations of Mg, Gd, and Co. Moreover, cobalt doping increased the magnetic coercivity by increasing the values of coercivity field (Hc) and remanence magnetisation (Mr), which could be utilized in magnetic recording devices.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Physics, Multidisciplinary
Zewdu Weldemichael Zena, Lemma Teshome Tufa, Dinsefa Mensur Andoshe, Abebe Belay Gemta, Francis Birhanu Dejene
Summary: A Cu-SnO2/ZnO nanocomposite with high photocatalytic efficiency and defect density was successfully prepared using a sol-gel method.
Article
Chemistry, Physical
Yingrui Zhao, Valentina Girelli, Ovidiu Ersen, Damien P. Debecker
Summary: In the power-to-gas scenario, surplus renewable electricity is stored in the form of methane by reacting green hydrogen with waste CO2. Low-cost catalysts with high activity at low temperature are necessary. This study introduces the sol-gel preparation of high-loading mesoporous Ni/SiO2 catalysts. Characterization techniques show that small Ni particles are obtained, even at high loading. The catalyst with the best performance achieved a specific activity almost three times higher than a reference catalyst prepared by impregnation.
JOURNAL OF CATALYSIS
(2023)
Article
Engineering, Chemical
Wei Qi, Junhui He, Mengjie Li, Maolin Zhai, Long Zhao
Summary: Rhenium has important applications in various industries, but its low concentration in the Earth's crust necessitates research on its separation and extraction. This study explored the extraction of rhenium using a demulsification method with an alkyl imidazolium ionic liquid-based microemulsion. Factors such as components of the microemulsion, temperature, acid concentration, and competitive ions were considered. The study found that the components of the microemulsion, alkyl chain length, and acid concentration significantly affected the extraction efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Physical
A. Belous, A. Tovstolytkin, O. Fedorchuk, Y. Shlapa, S. Solopan, B. Khomenko
Summary: In this study, a method for synthesizing nanosize particles of Y3AlFe4O12 garnet ferrite by precipitation in aqueous solutions at constant pH has been demonstrated. It was found that the filtration coefficient is three times greater when iron and aluminum hydroxides are precipitated simultaneously compared to when all hydroxides are precipitated simultaneously. After treatment at 800 degrees C, crystalline nanoparticles with an average particle size of 60-70 nm are formed. The ceramics obtained after proper heat treatment exhibit high density and good electrophysical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Yuliia Shlapa, Illia Timashkov, Katerina Veltruska, Katarina Siposova, Ivana Garcarova, Andrey Musatov, Sergii Solopan, Martina Kubovcikova, Anatolii Belous
Summary: The size of CeO2 nanoparticles is controlled largely by the dielectric constant of the reaction solution, and an increase in the percentage of Ce3+ ions at the surface leads to a reduction in nanoparticle size. All synthesized CeO2 NPs exhibit relatively high positive zeta-potential values in aqueous suspensions, indicating good stability. The catalase/peroxidase-like activity of CeO2 NPs is higher at a low percentage of Ce3+ at the NP surface, while smaller CeO2 NPs with a higher percentage of Ce3+ at the NP surface display higher oxidase-like activity.
Article
Physics, Multidisciplinary
A. Tovstolytkin, O. Nakonechna, I. Sharay, A. Bodnaruk, O. Bondar, V. M. Kalita, S. M. Ryabchenk, Y. Y. Shlapa, S. O. Solopan, A. G. Belous
Summary: Temperature-dependent magnetic properties and spin echo decay behavior were investigated for a set of La1-xSrxMnO3 (x = 0.23) nanoparticles (30 nm in diameter) synthesized using the sol-gel method. The study determined characteristic magnetic parameters, such as blocking temperature and effective Curie temperature for the ensemble. Enhanced coercivity and its unusual temperature dependence compared to bulk counterparts were observed, and possible explanations for this phenomenon were discussed. The study concludes that interparticle interactions play a significant role in enhancing the coercivity in the ensembles of substituted manganites.
ACTA PHYSICA POLONICA A
(2022)
Article
Biochemistry & Molecular Biology
Katarina Siposova, Veronika Huntosova, Ivana Garcarova, Yuliia Shlapa, Illia Timashkov, Anatolii Belous, Andrey Musatov
Summary: Oxidative stress is associated with amyloid-related diseases, and understanding the interplay between them is crucial for aging and age-related neurodegenerative diseases. Cerium dioxide nanoparticles show potential in studying oxidative stress and amyloid-related diseases, as their antioxidative effects and bioactivity depend on the size and valence of the nanoparticles.
Article
Multidisciplinary Sciences
Veronika Sarnatskaya, Yuliia Shlapa, Alexandra Lykhova, Olga Brieieva, Igor Prokopenko, Alexey Sidorenko, Serhii Solopan, Denis Kolesnik, Anatolii Belous, Vladimir Nikolaev
Summary: Carbon particles have the potential to reduce toxic substances and oxidative stress in biomedical applications, without harming normal cells or tissues.
Article
Chemistry, Physical
Olesya Nakonechna, Gurmeet Singh Lotey, Jaspinder Kaur, Andrii Bodnaruk, Viktor M. Kalita, Yuliia Yu Shlapa, Sergii O. Solopan, Alexandr Tovstolytkin
Summary: The principal factors leading to efficient AC field-induced heating of magnetic fluids are determined based on measurements of magnetic and calorimetric properties of NaFeO2 nanoparticles and their fluids. The magnetic behavior and parameters of NaFeO2 nanoparticles are identified, and the relationship between fluid caloric properties and AC magnetic field amplitude and nanoparticle concentration is analyzed. It is found that the heating efficiency of weakly coercive NaFeO2 nanoparticles shows an amplitude threshold character and the heating rate is critically dependent on AC magnetic field amplitude.
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
(2022)
Article
Biophysics
Yuliia Shlapa, Serhii Solopan, Veronika Sarnatskaya, Katarina Siposova, Ivana Garcarova, Katerina Veltruska, Illia Timashkov, Oleksandra Lykhova, Denis Kolesnik, Andrey Musatov, Vladimir Nikolaev, Anatolii Belous
Summary: CeO2 nanoparticles were successfully synthesized by precipitation in mixed water-alcohol solutions, and their physicochemical properties were characterized. The nanoparticles exhibited high stability and antioxidant potential, with the particle size and Ce3+/Ce4+ ratio affecting their antioxidant activity.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Gurmeet Singh Lotey, Ankush Kumar Tangra, Mohammed Benali Kanoun, Souraya Goumri-Said, Sanjeev Kumar, Mohinder Pal Garg, Alexandr Tovstolytkin, Nian X. Sun
Summary: Perovskite solar cells using inorganic calcium ferrite as a hole electron layer exhibit superior stability and efficiency compared to organic hole electron layers. Time-resolved photoluminescence spectroscopy shows improved charge extraction and reduced recombination at the interfaces. Theoretical analysis validates the experimental results and uncovers the mechanism behind the observed high-power conversion efficiency.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Yuliia Shlapa, Katarina Siposova, Katerina Veltruska, Valentin-Adrian Maraloiu, Ivana Garcarova, Michal Rajnak, Andrey Musatov, Anatolii Belous
Summary: This study reports the synthesis of core/shell nanocomposites based on magnetic magnetite and redox-active cerium dioxide nanoparticles. The nanocomposites demonstrate good stability in aqueous suspensions and retain the ability to heat efficiently in an alternating magnetic field. In addition, the nanocomposites exhibit excellent antioxidant and antiamyloidogenic activities, which make them promising for biomedical applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Biophysics
Ivana Garcarova, Eva Valusova, Yuliia Shlapa, Anatolii Belous, Andrey Musatov, Katarina Siposova
Summary: In this study, CeO2 nanoparticles (CeO2 NPs) were surface-modified with a nonionic sugar-based surfactant, dodecyl maltoside (DDM). The modified particles were found to be more effective in inhibiting the fibrillization of insulin compared to the naked particles. Furthermore, both naked CeO2 NPs and DDM-modified NPs exhibited antioxidant activity.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2023)
Article
Physics, Applied
V. Yu. Borynskyi, D. M. Polishchuk, Yu. O. Savina, V. O. Pashchenko, A. F. Kravets, A. I. Tovstolytkin, V. Korenivski
Summary: The antiferromagnet-ferromagnet thermomagnetic transition in arrays of the nanosized disks of Py/NiCu/Py synthetic antiferromagnets (SAFs) has been studied using SQUID magnetometry. The interlayer interaction in individual SAFs changes from high-temperature antiferromagnetic to low-temperature ferromagnetic at the Curie temperature T-C(f) of the interlayer f. The temperature dependence of the magnetic parameters of individual layers and their effect on the thermomagnetic transition features are determined.
LOW TEMPERATURE PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
D. M. Polishchuk, Yu. O. Tykhonenko-Polishchuk, Ya. M. Lytvynenko, A. M. Rostas, V. Kuncser, A. F. Kravets, A. I. Tovstolytkin, O. V. Gomonay, V. Korenivski
Summary: In this study, the interlayer coupling between two thin ferromagnetic films mediated by an antiferromagnetic spacer is investigated. The researchers distinguish between three different functional regimes of this ferromagnetic interlayer coupling by employing layer-selective Kerr magnetometry and ferromagnetic-resonance techniques. These experimental results, complemented by a theoretical analysis, contribute to a broader understanding of interlayer exchange in magnetic multilayers and have potential applications in spin thermionics.