Article
Physics, Applied
D. A. Balaev, I. S. Poperechny, A. A. Krasikov, S. Semenov, S. Popkov, Y. Knyazev, V. L. Kirillov, S. S. Yakushkin, O. N. Martyanov, Yu L. Raikher
Summary: The study on the magnetodynamics of cobalt ferrite nanoparticles revealed the influence of the superparamagnetic effect, with the increase in magnetic field variation rate leading to an increase in coercivity and a decrease with temperature. The proposed theoretical model explained the observed phenomena well.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Patricia C. Rivas Rojas, Pablo L. Tancredi, Cesar L. M. Londono-Calderon, Oscar Moscoso Londono, Leandro M. Socolovsky
Summary: In this study, core-shell structures with different core sizes and interparticle distances were used as a test bench to compare energetic parameters obtained from DC and AC magnetometry analysis. The results showed that the core size and shell thickness of the core-shell structures have a significant impact on the magnetic properties, and the dipolar and surface effects contribute significantly near the critical temperature.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Physical
G. B. Oliveira-Filho, J. J. Atoche-Medrano, F. F. H. Aragon, J. C. Mantilla Ochoa, D. G. Pacheco-Salazar, S. W. da Silva, J. A. H. Coaquira
Summary: Core-shell structure Au@Fe3O4 nanoparticles were synthesized using a thermal decomposition method, with a core diameter of approximately 10.5 nm and a shell thickness of roughly 1.85 nm. The nanocomposite exhibited a successful coupling of Au and Fe3O4, possessing good crystal structure and magnetic response characteristics.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Yu Knyazev, D. A. Balaev, S. Stolyar, O. A. Bayukov, R. N. Yaroslavtsev, V. P. Ladygina, D. A. Velikanov, R. S. Iskhakov
Summary: This study investigates the biogenic ferrihydrite nanoparticles and reveals the exceptional magnetic anisotropy formed by the highly developed surface of ferrihydrite nanoparticles. A core-shell structural model of the biogenic ferrihydrite particles is proposed based on Mossbauer data analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Pablo Tancredi, Patricia C. Rivas-Rojas, Oscar Moscoso-Londono, Diego Muraca, Marcelo Knobel, Leandro M. Socolovsky
Summary: The study investigates how the magnetic behavior of a set of magnetically hard nanoparticles can be improved by modifying sample arrangement and matrix properties. The research found that magnetically oriented nanoparticles exhibit a significant enhancement in remanence and coercive field at low temperatures, especially for the hardest samples, achieving coercive field values of around 30 kOe.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Rohit Ranga, Krishan Kumar, Ashok Kumar
Summary: A series of La3+ ion doped magnesium nickel ferrites were prepared and characterized for their structural and magnetic properties. The doping of La3+ ions resulted in a decrease in crystallite size, an increase in lattice parameter, and changes in magnetic properties. Additionally, the frequency and temperature variations affected the dielectric properties of the material.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Dogan Kaya, Idris Adanur, Mustafa Akyol, Faruk Karadag, Ahmet Ekicibil
Summary: CoPt nanoparticles were synthesized by the reduction of Pt(acac)2 and Co(acac)2 simultaneously under N-2 atmosphere with the polyol method. The structural and magnetic properties of CoPt nanoparticles are affected by the increased Pt concentration and size effects. The magnetic results showed that coercivity and exchange bias decreased with increasing temperature and Pt concentration as the nanoparticles transitioned from ferromagnetic to superparamagnetic phase.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Multidisciplinary Sciences
N. M. Basfer, Nuha Al-Harbi
Summary: Ce-doped cobalt-magnesium ferrite nanophotocatalysts prepared by the combustion approach show high efficiency in degrading harmful dyes. The hue of methylene blue can be faded from blue to nearly colorless with a degradation efficiency of 95.49% in 60 minutes.
JOURNAL OF KING SAUD UNIVERSITY SCIENCE
(2023)
Article
Thermodynamics
J. Shebha Anandhi, R. Justin Joseyphus
Summary: The heating characteristics of ferrite nanoparticles are influenced by factors affecting the optimum particle size for maximum power dissipation. An increase in effective specific absorption rate (ESAR) is observed with decreasing anisotropy energy, and there are discrepancies between simulations and experimentation results.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Nguyen Anh Tien, V. O. Mittova, B. V. Sladkopevtsev, Vo Quang Mai, I. Ya Mittova, Bui Xuan Vuong
Summary: Undoped and Y-doped NiFe2O4 nanoparticles were successfully synthesized. The appropriate annealing temperature and time to obtain single-phase spinel NiFe2-xYxO4 is 800 degrees C for 1 h. The samples demonstrated strong optical absorption in the UV and visible ranges, as well as strong ferromagnetic behavior.
SOLID STATE SCIENCES
(2023)
Article
Materials Science, Ceramics
Juliet Ordoukhanian, Azizollah Nezhadali, Leili Mehri
Summary: This study successfully synthesized uniform-sized nanoparticles of cobalt, nickel, and zinc ferrites using an electrochemical technique. Results showed that nanoparticles synthesized in a magnetic field had a narrower size distribution and higher saturation magnetization.
CERAMICS INTERNATIONAL
(2021)
Article
Biochemistry & Molecular Biology
Sergio R. S. Veloso, Raquel G. D. Andrade, Valeria Gomes, Carlos O. Amorim, Vitor S. Amaral, Veronica Salgueirino, Paulo J. G. Coutinho, Paula M. T. Ferreira, Miguel A. Correa-Duarte, Elisabete M. S. Castanheira
Summary: In this study, citrate-functionalized calcium-doped manganese ferrite nanoparticles were synthesized through thermally assisted oxidative precipitation. The nanoparticles showed good dispersibility and their microstructure and morphology could be controlled by adjusting the temperature and Ca/Mn ratio. The optical and magnetic properties of the nanoparticles were studied using UV-Vis absorption and SQUID, respectively. XRD and Raman spectroscopy were used to analyze the microstructural changes associated with particle stoichiometry, and the stability of the nanoparticles in physiological pH was tested using DLS. The nanoparticles exhibited high magnetization and heating efficiency under alternating magnetic field conditions, making them suitable for biomedical applications.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Engineering, Electrical & Electronic
Thi Kim Chung Nguyen, Anh Tien Nguyen
Summary: This work investigated the effect of annealing temperature and doped yttrium ions on the structural, optical, and magnetic properties of CoFe2-xYxO4 spinel nanoparticles. The particle size ranged from 22 to 40 nm, confirming their nanostructural character. Increasing annealing temperature led to increased structural characteristics, magnetic properties, and band gap energy values, while coercivity values showed the opposite trend. With an increase in yttrium ion content, all measured values decreased. Compared to cobalt ferrite doped with other elements, the yttrium-doped CoFe2O4 nanoparticles exhibited excellent optical and magnetic properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Xiang Yu, Tianyu Yang, Ruoshui Liu, Di'an Wu, Daming Tian, Tianshi Zhou, Haitao Yan, Shuli He, Hao Zeng
Summary: In this study, the efficiency of alternating current magnetic field and near-infrared heating is enhanced by co-doping Zn and Co in magnetite nanoparticles. Optimum magnetic anisotropy is achieved by tuning the doping concentration to maximize the loss power under each magnetic field. The specific loss power of the nanoparticles greatly exceeds previous levels, making it a promising nanoplatform for multi-modal local hyperthermia therapy.
Article
Engineering, Electrical & Electronic
Shivanshu Goel, Avesh Garg, Ankit Tyagi, Sachin Tyagi
Summary: The effect of carbon black addition on the microwave absorption properties of neodymium-doped barium hexaferrite nanoparticles was studied. The synthesis of BaNd0.04Fe11.96O19 nanoparticles was confirmed by XRD and SEM analysis. The addition of carbon black increased the complex dielectric constant of the ferrite, while decreasing the magnetic properties of the composites. The composite containing 80% BaNd0.04Fe11.96O19 and 20% carbon black exhibited a maximum reflection loss of -51.35 dB and a -10 dB bandwidth of 2.55 GHz in X-band, indicating high microwave absorption.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Estibaliz Ruiz-Bilbao, Markel Pardo-Almanza, Itziar Oyarzabal, Benat Artetxe, Leire San Felices, Jose A. Garcia, Jose Manuel Seco, Enrique Colacio, Luis Lezama, Juan M. Gutierrez-Zorrilla
Summary: The reaction of mid to late lanthanide ions with the N,N'-dimethyl-N,N'-bis(2-hydroxy-3-formyl-5-bromobenzyl)ethylene-diamine organic ligand and monolacunary Keggin type [alpha-SiW11O39](8-) anion affords a series of isostructural compounds, which display sandwich-type molecular structure and chairlike crystal packing. 1-Gd and 1-Yb exhibit slow relaxation of the magnetization and near-infrared emission, while the metal-centered luminescence in 1-Tb is quenched.
INORGANIC CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Jose Fernando Lopez-Toro, Luis Lezama, Daniel Salazar, Aminta Mendoza
Summary: In this study, the impact of Zn nonmagnetic doping on the magnetic properties of La1-xDyxMn1-yZnyO3 diluted samples above the Curie temperature is explored. Zn doping is found to affect the structure and distortions of MnO6 octahedra, leading to a relaxation effect on the stress. The transition from paramagnetic to ferromagnetic phase is observed in the temperature range of 130 to 190 K, with the presence of ferromagnetic spin clusters in the paramagnetic regime. Effective exchange constants and moments of the clusters are estimated using high-temperature expansion and magnetic measurements.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Polymer Science
Antonela Gallastegui, Antonio Dominguez-Alfaro, Luis Lezama, Nuria Alegret, Maurizio Prato, Maria L. Gomez, David Mecerreyes
Summary: This study presents a new photoinitiator system based on riboflavin, triethanolamine, and multiwalled carbon nanotubes for visible-light-induced photopolymerization of acrylic monomers. The mechanism of action of the carbon nanotubes in the system was studied, showing that they enhance the mechanical, thermal, and electrical properties of the resulting polymer.
Article
Chemistry, Analytical
Alaine Sanchez, Ahmed Esmail Shalan, Maibelin Rosales, Idoia Ruiz de Larramendi, Francisco Javier del Campo
Summary: This work presents a methodology for developing functional metal-oxide based inks for screen-printing by growing nickel hydroxide on the surface of conducting microparticles using different particle to nickel salt ratios. The resulting particles are used as screen-printing inks for electrodes and test structures. The materials are characterized through various techniques and the screen printed electrodes exhibit capabilities for water oxidation and glucose oxidation, as well as electrochromism and an optical bandgap in the range of 4.06-4.15 eV. The approach is applicable to other metal oxides, expanding the possibilities for screen-printed semiconductors and catalysts.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Lucia Garcia, Eneko Garaio, Alberto Lopez-Ortega, Itziar Galarreta-Rodriguez, Laura Cervera-Gabalda, Guillermo Cruz-Quesada, Alfonso Cornejo, Julian J. Garrido, Cristina Gomez-Polo, Jose Ignacio Perez-Landazabal
Summary: Hybrid magnetic nanoparticles consisting of an iron oxide core and a mesoporous SiO2 shell were synthesized. The nanoparticles exhibited high magnetization, large surface area, and efficient drug delivery. The controlled drug release efficiency and heating response of the nanoparticles were achieved using an external AC magnetic field.
Article
Chemistry, Inorganic & Nuclear
Alondra Jimenez-Perez, Sara Marcos-Gomez, Gotzon Madariaga, Manuel Zapico, Pablo Vitoria, Javier Tercero, M. Begona Torres, Luis Lezama, Jose Vicente Cuevas, Inigo Etxebarria, Javier Garcia-Tojal
Summary: Experimental and computational studies were performed on the [{CuLX}(2)] system, revealing the influence of electro-negativity of X on antiferromagnetic interactions. The crystal structures and spectroscopic results of the compounds with chlorido and iodido ligands were discussed. The computational calculations demonstrated the greater stability of chlorido species with neutral and anionic ligands.
Article
Chemistry, Multidisciplinary
Estibaliz Ruiz-Bilbao, Amaia Iturrospe, Santiago Reinoso, Benat Artetxe, Garikoitz Beobide, Leire San Felices, Luis Lezama, Juan M. Gutierrez-Zorrilla, Shaza Darwish, Debobroto Sensharma, Michael J. Zaworotko
Summary: This study reports the sequential single-crystal-to-single-crystal transformations of a 3D hybrid framework upon heating, resulting in two different anhydrous phases. These transformations modify the framework dimensionality and enable the isomerization of molybdate anions. The framework exhibits high recyclability and shows high water vapor sorption capabilities.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Biochemistry & Molecular Biology
Soumyadipta Rakshit, Alicia Maldonado Medina, Luis Lezama, Boiko Cohen, Abderrazzak Douhal
Summary: The photobehavior of Mn(II)-based perovskite materials with monovalent and bivalent alkyl interlayer spacers was investigated. The results showed that the coordination of Mn(II) ions and the electron-phonon couplings played a crucial role in the emission color and quantum yield of the perovskites. Moreover, encapsulating the perovskites into a PMMA film significantly improved their stability against moisture. These findings provide insights for the design and development of Mn(II)-based perovskites for lighting applications.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Review
Chemistry, Physical
Begona Acebedo, Maria C. Morant-Minana, Elena Gonzalo, Idoia Ruiz de Larramendi, Aitor Villaverde, Jokin Rikarte, Lorenzo Fallarino
Summary: Lithium metal batteries (LMBs) are a promising energy storage technology that can overcome the limitations of current Li-ion batteries. Their low density, low reduction potential, and high theoretical capacities can greatly improve the energy densities of the batteries. However, the efficiency at high current densities and the continuous degradation of LMBs are still challenges, which are related to the properties of the lithium metal anode (LMA). Therefore, the production and processing of LMAs are crucial to obtain the desired properties for LMBs.
ADVANCED ENERGY MATERIALS
(2023)
Article
Polymer Science
Naroa Lopez-Larrea, Antonela Gallastegui, Luis Lezama, Miryam Criado-Gonzalez, Nerea Casado, David Mecerreyes
Summary: Functional inks for light-based 3D printing are being explored, and a fast visible-light photopolymerization process of conductive PEDOT:PSS hydrogels is demonstrated. A new Type II photoinitiator system based on riboflavin, triethanolamine, and PEDOT:PSS is investigated, enabling full monomer conversion in less than 2 min using visible light. PEDOT:PSS plays a dual role by speeding up photoinitiation and enhancing the conductivity of the hydrogels.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Biochemistry & Molecular Biology
Homa Mousavi, Maria Eugenia Garcia-Rubino, Duane Choquesillo-Lazarte, Alfonso Castineiras, Luis Lezama, Antonio Frontera, Juan Niclos-Gutierrez
Summary: The reaction in water leads to the formation of a ternary copper compound, which has been characterized using various physical methods and theoretical calculations. The compound exhibits a specific molecular structure and dimensionality.
Article
Chemistry, Physical
Peng Huang, Manju Sheokand, David Payno Zarceno, Samrana Kazim, Luis Lezama, Mohammad Khaja Nazeeruddin, Rajneesh Misra, Shahzada Ahmad
Summary: To solve the toxicity issues related to lead-based halide perovskite solar cells, a lead-free double halide perovskite Cs2AgBiBr6 is proposed. However, the reduced rate of charge transfer affects the optoelectronic performance of double perovskites. By using interface engineering, a series of pyridine-based small molecules with different arms attached to the pyridine core are designed as hole-selective materials. The solar cells fabricated using Cs2AgBiBr6 as a light harvester and the designed hole-selective layer showed an unprecedented 2.9% power conversion efficiency. Our findings provide guidance for designing small molecules for electro-optical applications and developing lead-free perovskite materials for solar applications.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Medicinal
Itziar Galarreta-Rodriguez, Mikel Etxebeste-Mitxeltorena, Esther Moreno, Daniel Plano, Carmen Sanmartin, Saad Megahed, Neus Feliu, Wolfgang J. Parak, Eneko Garaio, Izaskun Gil de Muro, Luis Lezama, Idoia Ruiz de Larramendi, Maite Insausti
Summary: In this study, a drug carrier nanosystem based on Fe3O4 nanoparticles with large heating power was designed. The nanosystem showed high selectivity against colon cancer cells and demonstrated good efficacy as a magnetic hyperthermia inductor.
Article
Chemistry, Multidisciplinary
Ruben Gil-Garcia, Gotzon Madariaga, Alondra Jimenez-Perez, Ignacio Herran-Torres, Adrian Gago-Gonzalez, Maria Ugalde, Vaidas Januskaitis, Joaquin Barrera-Garcia, Maite Insausti, Maria S. Galletero, Joaquin Borras, Jose Vicente Cuevas, Rosa Pedrido, Patricia Gomez-Saiz, Luis Lezama, Javier Garcia-Tojal
Summary: The use of perchlorate ancillary ligands demonstrates the structural diversity of thiosemicarbazone copper(II) systems. Different types of compounds, including multi-nuclear species and mononuclear entities, were studied. Experimental evidence and theoretical calculations support a proposed mechanism for the partial desulfurization of TSC-Cu(II) entities.
Article
Chemistry, Physical
Pierre L. Stigliano, Nagore Ortiz-Vitoriano, Lidia Medinilla, Jason E. Bara, Juan Miguel Lopez del Amo, Luis Lezama, Maria Forsyth, David Mecerreyes, Cristina Pozo-Gonzalo
Summary: This study investigates the use of a branched ether solvent, 1,2,3-trimethoxypropane (TMP), as an alternative electrolyte for sodium-air batteries (SABs). The addition of a co-solvent, N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([C4mpyr][TFSI]), effectively limits the reactivity of TMP with sodium metal. The new cell design with a Na-beta-alumina disk for anode protection improves cell performance and achieves high discharge capacities. The findings highlight the potential of TMP as a base solvent and the importance of careful electrolyte composition design for greener and less toxic batteries.
FARADAY DISCUSSIONS
(2023)
