Article
Chemistry, Multidisciplinary
Rashmi Mahajan, Subramanian Suriyanarayanan, Ian A. Nicholls
Summary: Monodisperse magnetic gamma-Fe2O3 nanoparticles (MNPs) were prepared using SDS and PEG 6000 as double capping reagents, leading to improved uniformity and colloidal stability. These MNPs with silica coatings can be used in a variety of applications, such as magnetic separation, catalysis, and templated nanogel synthesis.
Article
Materials Science, Multidisciplinary
Hui Zheng, Yaohui Guo, Xinhua Song, Xinyu Zhu, Jiajun Yu
Summary: In this study, the characteristics of applying gamma-Fe2O3 NPs in large-scale space for electromagnetic wave absorption and stealth were explored using gamma-Fe2O3 NPs as an example. The physical properties of gamma-Fe2O3 NPs were characterized, and the wave absorption and attenuation characteristics were studied under different moisture content. The results indicate that the absorption attenuation decreases with decreasing concentration of gamma-Fe2O3 NPs. The absorption attenuation of gamma-Fe2O3 NPs with different water content decreases as the water content increases. The absorption mechanism mainly involves dielectric loss, magnetic loss caused by tunneling effect, interface polarization, and multiple scattering.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Environmental Sciences
Miryam Boulares, Baha Chamam, Amal Mejri, Mohamed Ali Wahab, Amani Haddouk, Lassaad El Mir, Ahmed Hichem Hamzaoui, Amjad Kallel, Chedly Tizaoui, Ismail Trabelsi
Summary: This research studied the adsorption removal of the pesticide chlorpyriphos (CPE) from water using a novel adsorbent made of gamma-Fe2O3/Al-ZnO nanocomposite. The adsorption process was influenced by parameters such as pH, pesticide concentration, %Fe2O3 of the adsorbent, and adsorption time. The study found that the maximum removal of CPE occurred at neutral pH and the Freundlich model best fit the adsorption isotherm. The results suggest that the gamma-Fe2O3/Al-ZnO nanocomposite is effective for the removal of chlorpyriphos and could be a promising material for the removal of emerging pollutants in wastewater.
Article
Nanoscience & Nanotechnology
Ji Hun Jung, Gye Seok An
Summary: This study investigates a method for synthesizing gamma-Fe2O3@SiO2 nanoparticles using sodium silicate (Na2SiO3) as a precursor. A surface treatment involving an acid or base is utilized to prepare activation sites for grafting the SiO2 network onto the magnetic particles. The effects of pH on the surface charge and coating layer thickness of the nanoparticles are analyzed, and the optimal pH is determined. The resulting nanoparticles exhibit improved dispersibility and are evaluated for DNA purification. Residual Na ions on the particle surface can reduce the purification efficiency, so additional acid treatment is performed to remove them. The correlation between surface charge and interparticle forces is examined, and it is found that the purification efficiency improves as the zeta potential and particle size distribution increase. In conclusion, gamma-Fe2O3@Na2SiO3 nanoparticles are successfully fabricated using Na2SiO3 and additional acid treatment, providing a promising alternative method for synthesizing gamma-Fe2O3@SiO2 nanoparticles with improved dispersibility and purification efficiency.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Marie-Charlotte Horny, Jean Gamby, Vincent Dupuis, Jean-Michel Siaugue
Summary: Magnetic hyperthermia on core-shell nanoparticles has shown promising advancements in biomedical applications, allowing for the release of DNA targets to mimic specific biological molecules. Silica-coated magnetic nanoparticles demonstrate efficient heating capabilities while maintaining low solution temperatures, making them suitable for biological media and energy efficiency.
Article
Physics, Condensed Matter
Jimmy Castillo, Vicmary Vargas, Daniel Macero, Aurelie Le Beulze, Wladimir Ruiz, Brice Bouyssiere
Summary: This study presents different methodologies for preparing Fe2O3@SiO2 nanoparticles and characterizing them. A new one-step method to obtain silica nanoparticles loaded with iron oxides and with high magnetic properties was highlighted.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Chemistry, Multidisciplinary
Ashish Chhaganlal Gandhi, Rajakar Selvam, Chia-Liang Cheng, Sheng Yun Wu
Summary: In this study, a room temperature magnetic memory effect was observed in magnetic nanodiamond/gamma-Fe2O3 nanocomposites. The composite nature and wide distribution of particle relaxation times in MND were found to influence the dynamics of the material. The observed room temperature ferromagnetism coupled with the memory effect may have potential applications in ND-based spintronics.
Article
Nanoscience & Nanotechnology
Mathilde Le Jeune, Emilie Secret, Michael Trichet, Aude Michel, Delphine Ravault, Francoise Illien, Jean-Michel Siaugue, Sandrine Sagan, Fabienne Burlina, Christine Menager
Summary: The endosomal entrapment of functional nanoparticles is a severe limitation to their use for biomedical applications. In this study, a conjugation strategy using cationic peptides was developed to improve the access of magnetic nanoparticles (MNPs) to the cytosol. It was found that peptides rich in histidine residues can promote endosomal escape and enhance the delivery of MNPs to the cytosol.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
S. K. Shaw, J. Kailashiya, A. Gangwar, S. K. Alla, Santosh K. Gupta, C. L. Prajapat, Sher Singh Meena, D. Dash, P. Maiti, N. K. Prasad
Summary: Recent research has uncovered a method of preparing gamma-Fe2O3 nanoflowers using microwave-assisted polyol technique with varying amounts of sodium acetate to modify structural and magnetic properties, leading to high efficiency heating performance during MHT and PTT.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
O. M. Lemine, Nawal Madkhali, Marzook Alshammari, Saja Algessair, Abbasher Gismelseed, Lassad El Mir, Moktar Hjiri, Ali A. Yousif, Kheireddine El-Boubbou
Summary: The study investigated the heating efficiencies of gamma-Fe2O3 and hybrid gamma-Fe2O3-TiO2 nanoparticles under an alternating magnetic field, showing that gamma-Fe2O3 exhibited better heating efficiency potential for magnetic hyperthermia treatment. The results suggest that the fabricated nanocomposites have great potential for various applications, particularly in magnetic photothermal hyperthermia treatments.
Article
Chemistry, Analytical
Romario J. da Silva, Graciela C. Pedro, Filipe D. S. Gorza, Bruna G. Maciel, Gabriela P. Ratkovski, Lizeth Carolina Mojica-Sanchez, Juan C. Medina-Llamas, Alicia E. Chavez-Guajardo, Celso P. de Melo
Summary: A new hybrid magnetic composite γ-NP/PEDOT was synthesized and characterized for efficient DNA separation, with excellent DNA adsorption capacity and high quality yields in complex biological samples. The simplicity of protocols and promising results suggest that this composite is competitive with commercially available magnetic purification kits.
ANALYTICA CHIMICA ACTA
(2021)
Article
Chemistry, Physical
Diogenes H. Piva, Roger H. Piva, Monize Picinini, Ariano D. Rodrigues, Ernesto A. Urquieta-Gonzalez
Summary: It was found in this study that during calcination between 400 and 600 degrees Celsius, the SiO2 shell can maintain the superparamagnetic characteristics of the gamma-Fe2O3 core, while high temperature can cause sintering of the SiO2 shell and reduce the surface area. Additionally, due to the enhanced dispersion of dioxo (O=)(2)WO2 species, the catalyst calcined at 500 degrees Celsius showed impressive performance in catalytic oxidation of dibenzothiophene.
CATALYSIS COMMUNICATIONS
(2021)
Article
Chemistry, Applied
Nassira Ferroudj, Patricia Beaunier, Anne Davidson, Sebastien Abramson
Summary: The study explored the relationship between the activity and structure of γ-Fe2O3/SiO2 nanocomposite microspheres as heterogeneous catalysts, revealing that doped Fe3+ and ordered mesoporosity significantly enhance the activity of the materials, demonstrating excellent oxidation and mineralization effects on simulated water pollutants.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Marianna Vasilakaki, Fevronia Gemenetzi, Eamonn Devlin, Dong Kee Yi, Siti Nurhanna Riduan, Su Seong Lee, Jackie Y. Ying, Georgia C. Papaefthymiou, Kalliopi N. Trohidou
Summary: The effect of core size on the magnetic behavior of nanoparticle assemblies was investigated, showing that an increase in magnetic core size results in a shift of the maximum magnetization peak to higher temperatures. The study sheds light on how interparticle distance and magnetic core size influence the behavior of the assembly.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yaqing Ge, Cuiping Li, Geoffrey I. N. Waterhouse, Xiaohui Jiang, Zhiming Zhang, Liangmin Yu
Summary: Polypyrrole-Maghemite-graphitic carbon nitride composites were successfully fabricated via one-step chemical synthesis, demonstrating outstanding electromagnetic wave absorption properties at microwave frequencies.
Article
Materials Science, Multidisciplinary
Kevin Lemoine, Alexandre Terry, Annie Hemon-Ribaud, Jean-Marc Greneche, Marc Leblanc, Jerome Lhoste, Vincent Maisonneuve
Summary: This paper presents the latest studies on iron-based fluorides, discussing their compositions and orders/disorders using Fe-57 Mossbauer spectrometry. A new ammonium hexafluoride compound, (NH4)Cu2+Fe3+F6, was synthesized and its disordered cubic pyrochlore structure was established using powder XRD. Mossbauer spectrometry confirmed the cationic disorder and magnetic frustration in Fe3+, and the hydration of (NH4)CuFeF6 resulted in the formation of a rare new structure, (NH4)CuFeF6(H2O)4(H2O)-H-, with millimeter-sized single crystals.
JOURNAL OF MATERIALS RESEARCH
(2023)
Review
Materials Science, Multidisciplinary
Laurent Charlet, Christophe Tournassat, Jean-Marc Greneche, Paul Wersin, Antoine Gehin, Jebril Hadi
Summary: Rates and mechanisms of important reactions in the cycling of electrons via the geochemical transformations of iron have been identified using Mossbauer spectrometry. The cycling of iron through various reservoirs depends on high surface-area-to-volume ratios of Fe-bearing solids. Fe-bearing solids surfaces can interact chemically with reductants and oxidants, facilitating electron transfer as well as dissolution and precipitation.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Nanoscience & Nanotechnology
Mykhailo Nahorniak, Pamela Pasetto, Jean-Marc Greneche, Volodymyr Samaryk, Sandy Auguste, Anthony Rousseau, Nataliya Nosova, Serhii Varvarenko
Summary: The aim of this study was to synthesize magnetic nanoparticles in a single reactor using Fe(III) acetyl-acetonate as the initial precursor, followed by thermolysis in situ. The nanoparticles were characterized in terms of morphology, hydrodynamic diameter, and composition. The influence of unsaturated oleic acid and undecylenic acid on the properties of the particles was investigated.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2023)
Article
Chemistry, Physical
Fouad Boukhelf, Daniel Lira Lopes Targino, Mohammed Hichem Benzaama, Lucas Feitosa de Albuquerque Lima Babadopulos, Yassine El Mendili
Summary: An artificial neural network (ANN) model is proposed to predict the hydration process of a new alternative binder. This model overcomes the lack of input parameters of physical models and provides a realistic explanation with few inputs and fast calculations. Furthermore, CEMIII mortar performs similarly to mortar with CEMI + GP in the long term and can be used in the construction sector.
Article
Chemistry, Multidisciplinary
T. K. N. Nguyen, F. Grasset, S. Cordier, N. Dumait, S. Ishii, H. Fudouzi, T. Uchikoshi
Summary: The electrophoretic deposition and photonic crystal structural engineering were used to study the light absorption and electronic conduction properties of a tin pyrophosphate semiconductor integrated with a hexamolybdenum cluster compound (Mo6 cluster). The size of the pores, surface modification, and chemical composition of the infiltration material in the inverse opal film were investigated to control the photonic bandgap and deposition efficiency of the Mo6 cluster. The photoactive Mo6 clusters acted as visible light harvesters, generating efficient photo-induced current through a slow photon effect at the edges of the photonic stopband.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Moritz Bernhardt, Maciej D. D. Korzynski, Zachariah J. J. Berkson, Fabrice Pointillart, Boris Le Guennic, Olivier Cador, Christophe Coperet
Summary: Generating or retaining slow magnetic relaxation in surface-immobilized single-molecule magnets (SMMs) from molecular precursors is a challenging task. However, a material with SMM characteristics has been successfully generated by chemisorption of (Cp-ttt)(2)DyCl on a silica surface containing tailored Lewis acidic Al-(III) sites. Detailed studies reveal slow magnetic relaxation up to 51 K, hysteresis up to 8 K, and an effective energy barrier (U (eff)) of 449 cm(-1), the highest reported for a supported SMM.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Mieszko Kolodziej, Jean-Marc Greneche, Sandy Auguste, Bogdan Idzikowski, Maciej Zubko, Lotfi Bessais, Zbigniew Sniadecki
Summary: Iron-based compounds with a ThMn12-type structure have the potential to bridge the gap between ferrites and high performance Nd2Fe14B magnets. The advantage lies in their composition, which contains less rare earth elements. However, the main issue is the structural stability of Fe-rich alloys with a ThMn12-type structure. Various synthesis methods and stabilizing elements have been proposed to address this issue.
Article
Crystallography
Abdulrahman Mallah, Fatimah Al-Thuwayb, Mohamed Khitouni, Abdulrahman Alsawi, Joan-Josep Sunol, Jean-Marc Greneche, Maha M. Almoneef
Summary: The sol-gel process was used to synthesize ferrite Ni0.3Zn0.7Cr2-xFexO4 nanoparticles, which were then calcined at various temperatures. The structure and magnetic properties of the nanoparticles were characterized by XRD, SEM, VSM, and Mossbauer spectrometry. The results showed that the nanoparticles had a single-phase spinel structure and low magnetization due to the absence of ferromagnetic Ni2+ ions and weak interactions between Fe3+ ions.
Article
Construction & Building Technology
Houssam Affan, Karim Touati, Mohammed-Hichem Benzaama, Daniel Chateigner, Yassine El Mendili
Summary: Stranded seaweed poses a serious threat to coastal areas when the tide recedes. This study investigated the potential use of Sargassum mitucum seaweed fiber in building construction. The results showed that a cob made with Sargassum muticum algae exhibited better thermal and hygroscopic properties compared to a cob made with flax fiber. The study also highlighted the global issue of sargassum algae expansion and suggested that utilizing stranded algae could improve the mechanical and hygrothermal performance of cob-based materials.
Article
Green & Sustainable Science & Technology
Karim Touati, Mohammed-Hichem Benzaama, Yassine El Mendili, Malo Le Guern, Francois Streiff, Steve Goodhew
Summary: This paper investigates the hygrothermal behavior of a cob prototype building equipped with sensors. The experimental results show that the earth-based building has good thermal insulation performance and the ability to regulate indoor relative humidity. A LSTM model is developed and trained to predict the indoor ambience, with excellent agreement to experimental data. The paper also discusses the economic aspects of the CobBauge system.
Article
Chemistry, Inorganic & Nuclear
Regis Guegan, Xiaoxue Cheng, Xiang Huang, Zuzana Nemeckova, Michaela Kubanova, Jaroslav Zelenka, Tomas Ruml, Fabien Grasset, Yoshiyuki Sugahara, Kamil Lang, Kaplan Kirakci
Summary: The emergence of multidrug-resistant microbial pathogens poses a significant threat to effective antibiotic therapy. Photoinactivation using materials generating reactive oxygen species upon exposure to visible light can overcome this challenge by targeting vital components of living cells, reducing the likelihood of resistance development.
INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Carlo Andrea Mattei, Vincent Montigaud, Bertrand Lefeuvre, Vincent Dorcet, Gilles Argouarch, Olivier Cador, Boris Le Guennic, Olivier Maury, Claudia Lalli, Yannick Guyot, Stephan Guy, Cyprien Gindre, Amina Bensalah-Ledoux, Francois Riobe, Bruno Baguenard, Fabrice Pointillart
Summary: Lanthanide ions have attracted significant interest due to their optical and magnetic properties. The combination of single-molecule magnet (SMM) behavior and circularly polarized luminescence (CPL) in a single molecular system is rare and deserves attention for the design of multifunctional materials. Chiral one-dimensional coordination compounds involving Yb(iii) center and BINOL-derived bisphosphate ligands exhibited field-induced SMM behavior and near infrared CPL in the solid state, as characterized by X-ray diffraction.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Review
Chemistry, Multidisciplinary
Fabrice Pointillart, Kevin Bernot, Boris Le Guennic, Olivier Cador
Summary: This review article provides a comprehensive description of the influence of nuclear spin, namely the hyperfine interaction, on the magnetic properties of lanthanide single-molecule magnets (SMMs) and on quantum information processing of qudit. The article analyzes this influence for non-Kramers and Kramers lanthanide SMMs, as well as for the electronic distribution of the electron in 4f orbitals, i.e. oblate and prolate ions. Additionally, the role of magnetic interactions in isotopically enriched polynuclear Dy(iii) SMMs is discussed, along with the possible effect of superhyperfine interaction due to the nuclear spin of elements surrounding the lanthanide centre. The effect of nuclear spin on the dynamics of lanthanide SMMs is demonstrated using various techniques such as magnetometry, muon spectroscopy, and Mossbauer and Resonance Vibrational Spectroscopies.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Hao Wang, Zhenhua Zhu, Leo La Droitte, Wuping Liao, Olivier Cador, Boris Le Guennic, Jinkui Tang
Summary: Two luminescent Tb(iii)-calixarene aggregates with architectures of 1D chain (1) and 3D network (2) have been synthesized, and their single-molecule toroidal (SMT) characteristics have been experimentally investigated with the support of ab initio calculations. Aggregate 2 with a 3D structure is the first covalently bonded 3D SMT polymer that has been successfully synthesized.
Article
Chemistry, Multidisciplinary
Florian Benner, Leo La Droitte, Olivier Cador, Boris Le Guennic, Selvan Demir
Summary: A judicious combination of radical ligands with paramagnetic metal ions elicits strong magnetic exchange coupling, which leads to important properties for future technologies. The metal-radical approach aids in effective magnetic communication, especially for lanthanide ions. The presented complexes of bisbenzimidazole-based dilanthanide exhibit strong antiferromagnetic coupling and single-molecule magnetism, showing potential for applications in organic radical bridge materials.
