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2. An alternative synthesis of magnetic biochar from green coconut husks and its application for simultaneous and individual removal of caffeine and salicylic acid from aqueous solution

Author

Peixoto, Bruno Salarini, de Oliveira Mota, Larissa Silva, Dias, Isac Marinho, Muzzi, Beatrice, Albino, Martin, Petrecca, Michele, Innocenti, Claudia, de Oliveira, Pamella Christina Ortega, Romeiro, Gilberto Alves, Sangregorio, Claudio, and de Moraes, Marcela Cristina

Published
2023
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3. Medical Applications of Magnetic Nanoparticles

Author

Avolio, Matteo, Innocenti, Claudia, Lascialfari, Alessandro, Mariani, Manuel, Sangregorio, Claudio, Hull, Robert, Series Editor, Jagadish, Chennupati, Series Editor, Kawazoe, Yoshiyuki, Series Editor, Kruzic, Jamie, Series Editor, Osgood, Richard M., Series Editor, Parisi, Jürgen, Series Editor, Pohl, Udo W., Series Editor, Seong, Tae-Yeon, Series Editor, Uchida, Shin-ichi, Series Editor, Wang, Zhiming M., Series Editor, Peddis, Davide, editor, Laureti, Sara, editor, and Fiorani, Dino, editor

Published
2021
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7. Simultaneous near infrared photothermal therapy and temperature mapping by magnetic resonance in 3D cell aggregates loaded with Fe3Se4 nanoparticles

Author

Soeiro, Joana F., primary, Pereira, Rute A., additional, Oliveira-Silva, Rui, additional, Sousa, Filipa L., additional, Gaspar, Vítor M., additional, Mano, João F., additional, Millán, Ángel, additional, Innocenti, Claudia, additional, Mariani, Manuel, additional, Lascialfari, Alessandro, additional, and Silva, Nuno J. O., additional

Published
2024
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12. Defect‐Engineering by Solvent Mediated Mild Oxidation as a Tool to Induce Exchange Bias in Metal Doped Ferrites

Author

Muzzi, Beatrice, primary, Albino, Martin, additional, Petrecca, Michele, additional, Innocenti, Claudia, additional, de Julián Fernández, César, additional, Bertoni, Giovanni, additional, Ibarra, M. Ricardo, additional, Christensen, Mogens, additional, Avdeev, Maxim, additional, Marquina, Clara, additional, and Sangregorio, Claudio, additional

Published
2023
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14. Defect-engineering by solvent mediated mild oxidation as a tool to induce exchange bias in metal doped ferrites

Author

European Commission, Ministero dell'Istruzione, dell'Università e della Ricerca, Muzzi, Beatrice, Albino, Martin, Petrecca, Michele, Innocenti, Claudia, Julián Fernández, César de, Bertoni, Giovanni, Ibarra, M. Ricardo, Christensen, Mogens, Avdeev, Maxim, Marquina, Clara, Sangregorio, Claudio, European Commission, Ministero dell'Istruzione, dell'Università e della Ricerca, Muzzi, Beatrice, Albino, Martin, Petrecca, Michele, Innocenti, Claudia, Julián Fernández, César de, Bertoni, Giovanni, Ibarra, M. Ricardo, Christensen, Mogens, Avdeev, Maxim, Marquina, Clara, and Sangregorio, Claudio

Abstract

The crystal site occupancy of different divalent ions and the induction of lattice defects represent an additional tool for modifying the intrinsic magnetic properties of spinel ferrites nanoparticles. Here, the relevance of the lattice defects is demonstrated in the appearance of exchange-bias and in the improvement of the magnetic properties of doped ferrites of 20 nm, obtained from the mild oxidation of core@shell (wüstite@ferrite) nanoparticles. Three types of nanoparticles (Fe0.95 O@Fe3 O4 , Co0.3 Fe0.7 O@Co0.8 Fe2.2 O4 and Ni0.17 Co0.21 Fe0.62 O@Ni0.4 Co0.3 Fe2.3 O4 ) are oxidized. As a result, the core@shell morphology is removed and transformed in a spinel-like nanoparticle, through a topotactic transformation. This study shows that most of the induced defects in these nanoparticles and their magnetic properties are driven by the inability of the Co(II) ions at the octahedral sites to migrate to tetrahedral sites, at the chosen mild oxidation temperature. In addition, the appearance of crystal defects and antiphase boundaries improves the magnetic properties of the starting compounds and leads to the appearance of exchange bias at room temperature. These results highlight the validity of the proposed method to impose novel magnetic characteristics in the technologically relevant class of nanomaterials such as spinel ferrites, expanding their potential exploitation in several application fields.

Published
2023

16. Proton Therapy, Magnetic Nanoparticles and Hyperthermia as Combined Treatment for Pancreatic BxPC3 Tumor Cells

Author

Brero, Francesca, primary, Calzolari, Paola, additional, Albino, Martin, additional, Antoccia, Antonio, additional, Arosio, Paolo, additional, Berardinelli, Francesco, additional, Bettega, Daniela, additional, Ciocca, Mario, additional, Facoetti, Angelica, additional, Gallo, Salvatore, additional, Groppi, Flavia, additional, Innocenti, Claudia, additional, Laurenzana, Anna, additional, Lenardi, Cristina, additional, Locarno, Silvia, additional, Manenti, Simone, additional, Marchesini, Renato, additional, Mariani, Manuel, additional, Orsini, Francesco, additional, Pignoli, Emanuele, additional, Sangregorio, Claudio, additional, Scavone, Francesca, additional, Veronese, Ivan, additional, and Lascialfari, Alessandro, additional

Published
2023
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21. Optimizing the magnetic properties of hard and soft materials for producing exchange spring permanent magnets

Author

AMPHIBIAN Project ID:720853, Petrecca, Michele, Muzzi, Beatrice, Oliveri, Stefano Maria, Albino, Martin, Yaacoub, Nader, Peddis, Davide, Julián Fernández, César de, Innocenti, Claudia, Sangregorio, Claudio, European Commission, Petrecca, Michele, Muzzi, Beatrice, Albino, Martin, Julián Fernández, César de, Innocenti, Claudia, Sangregorio, Claudio, Petrecca, Michele [0000-0002-4895-0254], Muzzi, Beatrice [0000-0001-9151-7723], Albino, Martin [0000-0001-7438-0833], Julián Fernández, César de [0000-0002-6671-2743], Innocenti, Claudia [0000-0003-3705-4283], and Sangregorio, Claudio [0000-0002-2655-3901]

Subjects
Materials science, Exchange coupling, Magnetic nanoparticles, Permanent magnet, Strontium ferrite, Zinc ferrite, Acoustics and Ultrasonics, Condensed Matter Physics, Soft materials, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Spring (device), Magnet, Composite material
Abstract

[EN] The exploitation of the exchange coupling between hard and soft magnetic materials has been proposed for enhancing the magnetic performances of rare-earth free permanent magnets, with the aim of extending their use to all applications where moderate energy product (35–100 kJ m−3) is required. Strontium hexaferrite (SFO)/spinel ferrite composites seem particularly promising to achieve this target, although the conditions to maximize the effect while using techniques easily scalable to industrial production have not yet been identified. Within this framework, the optimization of the structural, chemical, and magnetic properties of the two moieties before the coupling procedure is crucial to enhance the energy product of the final composite. Here we report the syntheses of both nanometric SFO with high coercivity (ca. 525 kA m−1) and quasi-bulk saturation magnetization (68 Am2 kg−1) and a series of nanosized zinc-doped ferrite (ZnxFe3−xO4, 0.0 ⩽ x ⩽ 0.4) through cheap, easily scalable and eco-friendly approaches. The structural and chemical stability of the two magnetic phases as a function of temperature were investigated up to 1100 ◦C, with the aim of finding the best compromise between preservation of the nanometric scale and magnetic properties. A very high-magnetization (106 Am2 kg−1) ferrite was obtained by annealing Zn0.3Fe2.7O4 nanopowder at the highest investigated temperature. A preliminary attempt at coupling the two phases, starting from a mixture of the nanopowders, was performed through a classic annealing process in the temperature range 500 ◦C–1100 ◦C. The adopted procedure allowed for obtaining an exchange coupled composite at 1100 ◦C where the two phases are intimately and homogeneously mixed, with micrometric (0.3–5 μm) and nanometric (up to 50 nm) spinel ferrite particles. Despite these promising results, no enhancement of the energy product was found, highlighting the need for further experimental efforts to improve the coupling procedure., We acknowledge Dr S Ciattini and Dr L Chelazzi of the Centro Servizi di Cristallografia Strutturale at the University of Florence for help in x-ray powder diffraction data collection, Dr L Capozzoli and Dr A Lavacchi of Ce.M.E.—Centro di Microscopie Elettroniche Laura Bonzi of CNR for SEM and STEM images, Professor S Caporali and Dr S Martinuzzi of the University of Florence for SEM images, and the European Commission for funds through project H2020 No. 720853 (AMPHIBIAN).

Published
2021
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22. Supporting Information for 3d metal doping of core@shell wüstite@ferrite nanoparticles as a promising route toward room temperature exchange bias magnets

Author

Muzzi, Beatrice, Albino, Martin, Petrecca, Michele, Innocenti, Claudia, Julián Fernández, César de, Bertoni, Giovanni, Marquina, Clara, Ibarra, M. Ricardo, Sangregorio, Claudio, AMPHIBIAN Project ID:720853, Muzzi, Beatrice, Albino, Martin, Petrecca, Michele, Innocenti, Claudia, Julián Fernández, César de, Bertoni, Giovanni, Marquina, Clara, Ibarra, M. Ricardo, Sangregorio, Claudio, and AMPHIBIAN Project ID:720853

Published
2022

23. 3d metal doping of core@shell wüstite@ferrite nanoparticles as a promising route toward room temperature exchange bias magnets

Author

European Commission, Muzzi, Beatrice, Albino, Martin, Petrecca, Michele, Innocenti, Claudia, Julián Fernández, César de, Bertoni, Giovanni, Marquina, Clara, Ibarra, M. Ricardo, Sangregorio, Claudio, AMPHIBIAN Project ID:720853, European Commission, Muzzi, Beatrice, Albino, Martin, Petrecca, Michele, Innocenti, Claudia, Julián Fernández, César de, Bertoni, Giovanni, Marquina, Clara, Ibarra, M. Ricardo, Sangregorio, Claudio, and AMPHIBIAN Project ID:720853

Abstract

Nanometric core@shell wüstite@ferrite (Fe1-xO@Fe3O4) has been extensively studied because of the emergence of exchange bias phenomena. Since their actual implementation in modern technologies is hampered by the low temperature at which bias is operating, the critical issue to be solved is to obtain exchange-coupled antiferromagnetic@ferrimagnetic nanoparticles with ordering temperature close to 300 K by replacing the divalent iron with other transition-metal ions. Here, we studied the effect of the combined substitution of Fe(II) with Co(II) and Ni(II) on the crystal structure and magnetic properties. To this aim, a series of 20 nm nanoparticles with a wüstite-based core and a ferrite shell, with tailored composition, (Co0.3Fe0.7O@Co0.8Fe2.2O4 and Ni0.17Co0.21Fe0.62O@Ni0.4Co0.3Fe2.3O4) were synthetized through a thermal-decomposition method. An extensive morphological and crystallographic characterization of the obtained nanoparticles showed how a higher stability against the oxidation process in ambient condition is attained when divalent cation doping of the iron oxide lattice with Co(II) and Ni(II) ions is performed. The dual-doping revealed to be an efficient way for tuning the magnetic properties of the final system, obtaining Ni-Co doped iron oxide core@shell nanoparticles with high coercivity (and therefore, high energy product), and increased antiferromagnetic ordering transition temperature, close to room temperature.

Published
2022

24. Study of an Impact Mill-Based Mechanical Method for NdFeB Magnet Recycling.

Author

Pošković, Emir, Franchini, Fausto, Ceroni, Marta, Innocenti, Claudia, Ferraris, Luca, Sangregorio, Claudio, Caneschi, Andrea, and Actis Grande, Marco

Subjects
IMPACT (Mechanics), MAGNETS, CIRCULAR economy, YANG-Mills theory, RARE earth metals, CHEMICAL processes, MAGNETIC properties, RAW materials
Abstract

Nowadays, the circular economy is gaining more and more attention in sectors where the raw material supply is critical for both cost and geo-political reasons. Moreover, the environmental impact issue calls for recycling. From this perspective, the recovery of rare earth elements represents a strategic point. On the other hand, the high cost and the dangerous standard recovery methods that apply to NdFeB magnets limits options for traditional recycling. A new mechanical method is proposed, not requiring hydrogen, high temperature, or chemical processes, but instead using an impact mill designed to operate in vacuum. A traditional impact mill operating in a glove box filled with Ar atmosphere has also been used for comparison. The obtained NdFeB powders were analyzed in terms of magnetic properties and chemical composition, particularly in terms of the oxygen content. [ABSTRACT FROM AUTHOR]

Published
2023
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26. Star-Shaped Magnetic-Plasmonic Au@Fe3O4 Nano-Heterostructures for Photothermal Therapy

Author

Muzzi, Beatrice, primary, Albino, Martin, additional, Gabbani, Alessio, additional, Omelyanchik, Alexander, additional, Kozenkova, Elena, additional, Petrecca, Michele, additional, Innocenti, Claudia, additional, Balica, Elena, additional, Lavacchi, Alessandro, additional, Scavone, Francesca, additional, Anceschi, Cecilia, additional, Petrucci, Gaia, additional, Ibarra, Alfonso, additional, Laurenzana, Anna, additional, Pineider, Francesco, additional, Rodionova, Valeria, additional, and Sangregorio, Claudio, additional

Published
2022
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28. 1 H-NMR Relaxation of Ferrite Core-Shell Nanoparticles: Evaluation of the Coating Effect.

Author

Brero, Francesca, Arosio, Paolo, Albino, Martin, Cicolari, Davide, Porru, Margherita, Basini, Martina, Mariani, Manuel, Innocenti, Claudia, Sangregorio, Claudio, Orsini, Francesco, and Lascialfari, Alessandro

Subjects
MAGNETIC nanoparticles, MAGNETIC cores, FERRITES, SURFACE coatings, NANOPARTICLES, IRON oxide nanoparticles, MAGNETIC nanoparticle hyperthermia
Abstract

We investigated the effect of different organic coatings on the 1H-NMR relaxation properties of ultra-small iron-oxide-based magnetic nanoparticles. The first set of nanoparticles, with a magnetic core diameter d s 1 = 4.4 ± 0.7 nm, was coated with polyacrylic acid (PAA) and dimercaptosuccinic acid (DMSA), while the second set, d s 2 = 8.9 ± 0.9 nm, was coated with aminopropylphosphonic acid (APPA) and DMSA. At fixed core diameters but different coatings, magnetization measurements revealed a similar behavior as a function of temperature and field. On the other hand, the 1H-NMR longitudinal r 1 nuclear relaxivity in the frequency range ν = 10 kHz ÷ 300 MHz displayed, for the smallest particles (diameter d s 1 ), an intensity and a frequency behavior dependent on the kind of coating, thus indicating different electronic spin dynamics. Conversely, no differences were found in the r 1 relaxivity of the biggest particles ( d s 2 ) when the coating was changed. It is concluded that, when the surface to volume ratio, i.e., the surface to bulk spins ratio, increases (smallest nanoparticles), the spin dynamics change significantly, possibly due to the contribution of surface spin dynamics/topology. [ABSTRACT FROM AUTHOR]

Published
2023
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30. Unraveling the mechanism of the one-pot synthesis of exchange coupled Co-based nano-heterostructures with a high energy product

Author

Muzzi, Beatrice, Albino, Martin, Innocenti, Claudia, Petrecca, Michele, Cortigiani, Brunetto, Julián Fernández, César de, Bertoni, Giovanni, Fernández-Pacheco, Rodrigo, Ibarra, Alfonso, Marquina, Clara, Ibarra, M. Ricardo, Sangregorio, Claudio, AMPHIBIAN Project ID:720853, and European Commission

Abstract

The development of reproducible protocols to synthesize hard/soft nano-heterostructures (NHSs) with tailored magnetic properties is a crucial step to define their potential application in a variety of technological areas. Thermal decomposition has proved to be an effective tool to prepare such systems, but it has been scarcely used so far for the synthesis of Co-based metal/ferrite NHSs, despite their intriguing physical properties. We found a new approach to prepare this kind of nanomaterial based on a simple one-pot thermal decomposition reaction of metal-oleate precursors in the high boiling solvent docosane. The obtained NHSs are characterized by the coexistence of Co metal and Co doped magnetite and are highly stable in an air atmosphere, thanks to the passivation of the metal with a very thin oxide layer. The investigation of the influence of the metal precursor composition (a mixed iron–cobalt oleate), of the ligands (oleic acid and sodium oleate) and of the reaction time on the chemical and structural characteristics of the final product, allowed us to rationalize the reaction pathway and to determine the role of each parameter. In particular, the use of sodium oleate is crucial to obtain a metal phase in the NHSs. In such a way, the one-pot approach proposed here allows the fine control of the synthesis, leading to the formation of stable, high performant, metal/ferrite NHSs with tailored magnetic properties. For instance, the room temperature maximum energy product was increased up to 19 kJ m−3 by tuning the Co content in the metal precursor., This work was supported by EU-H2020 AMPHIBIAN Project (no. 720853) and by European Union's Horizon 2020 research and innovation programme under grant agreement no. 823717-ESTEEM3.

Published
2020

32. Modulation of the magnetic properties of gold-spinel ferrite heterostructured nanocrystals

Author

European Commission, Università di Pisa, AMPHIBIAN Project ID:720853, Fantechi, Elvira, Innocenti, Claudia, Bertoni, Giovanni, Sangregorio, Claudio, Pineider, Francesco, European Commission, Università di Pisa, AMPHIBIAN Project ID:720853, Fantechi, Elvira, Innocenti, Claudia, Bertoni, Giovanni, Sangregorio, Claudio, and Pineider, Francesco

Abstract

[EN] The rational design of complex nanostructures is of paramount importance to gain control over their chemical and physical properties. Recently, magnetic-plasmonic heterostructured nanocrystals have been recognized as key players in nanomedicine as multifunctional therapeutic-diagnostic tools and in catalysis. Here we show how the properties of gold-iron oxide heterostructured nanocrystals can be tuned by chemical doping of the magnetic subunit. The divalent cations in the iron oxide were substituted with cobalt and manganese to obtain a general formula Au-MFe2O4 (M = Fe, Co, Mn). Magnetic properties of the heterostructures could be tuned, while maintaining well-defined plasmon resonance signatures, confirming the dual magnetic-plasmonic functional capability of these nanostructures.

Published
2020

33. Unraveling the mechanism of the one-pot synthesis of exchange coupled Co-based nano-heterostructures with a high energy product

Author

European Commission, Muzzi, Beatrice, Albino, Martin, Innocenti, Claudia, Petrecca, Michele, Cortigiani, Brunetto, Julián Fernández, César de, Bertoni, Giovanni, Fernández-Pacheco, Rodrigo, Ibarra, Alfonso, Marquina, Clara, Ibarra, M. Ricardo, Sangregorio, Claudio, AMPHIBIAN Project ID:720853, European Commission, Muzzi, Beatrice, Albino, Martin, Innocenti, Claudia, Petrecca, Michele, Cortigiani, Brunetto, Julián Fernández, César de, Bertoni, Giovanni, Fernández-Pacheco, Rodrigo, Ibarra, Alfonso, Marquina, Clara, Ibarra, M. Ricardo, Sangregorio, Claudio, and AMPHIBIAN Project ID:720853

Abstract

The development of reproducible protocols to synthesize hard/soft nano-heterostructures (NHSs) with tailored magnetic properties is a crucial step to define their potential application in a variety of technological areas. Thermal decomposition has proved to be an effective tool to prepare such systems, but it has been scarcely used so far for the synthesis of Co-based metal/ferrite NHSs, despite their intriguing physical properties. We found a new approach to prepare this kind of nanomaterial based on a simple one-pot thermal decomposition reaction of metal-oleate precursors in the high boiling solvent docosane. The obtained NHSs are characterized by the coexistence of Co metal and Co doped magnetite and are highly stable in an air atmosphere, thanks to the passivation of the metal with a very thin oxide layer. The investigation of the influence of the metal precursor composition (a mixed iron–cobalt oleate), of the ligands (oleic acid and sodium oleate) and of the reaction time on the chemical and structural characteristics of the final product, allowed us to rationalize the reaction pathway and to determine the role of each parameter. In particular, the use of sodium oleate is crucial to obtain a metal phase in the NHSs. In such a way, the one-pot approach proposed here allows the fine control of the synthesis, leading to the formation of stable, high performant, metal/ferrite NHSs with tailored magnetic properties. For instance, the room temperature maximum energy product was increased up to 19 kJ m−3 by tuning the Co content in the metal precursor.

Published
2020

37. Hadron Therapy, Magnetic Nanoparticles and Hyperthermia: A Promising Combined Tool for Pancreatic Cancer Treatment

Author

Brero, Francesca, primary, Albino, Martin, additional, Antoccia, Antonio, additional, Arosio, Paolo, additional, Avolio, Matteo, additional, Berardinelli, Francesco, additional, Bettega, Daniela, additional, Calzolari, Paola, additional, Ciocca, Mario, additional, Corti, Maurizio, additional, Facoetti, Angelica, additional, Gallo, Salvatore, additional, Groppi, Flavia, additional, Guerrini, Andrea, additional, Innocenti, Claudia, additional, Lenardi, Cristina, additional, Locarno, Silvia, additional, Manenti, Simone, additional, Marchesini, Renato, additional, Mariani, Manuel, additional, Orsini, Francesco, additional, Pignoli, Emanuele, additional, Sangregorio, Claudio, additional, Veronese, Ivan, additional, and Lascialfari, Alessandro, additional

Published
2020
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38. Coating Effect on the 1H—NMR Relaxation Properties of Iron Oxide Magnetic Nanoparticles

Author

Brero, Francesca, primary, Basini, Martina, additional, Avolio, Matteo, additional, Orsini, Francesco, additional, Arosio, Paolo, additional, Sangregorio, Claudio, additional, Innocenti, Claudia, additional, Guerrini, Andrea, additional, Boucard, Joanna, additional, Ishow, Eléna, additional, Lecouvey, Marc, additional, Fresnais, Jérome, additional, Lartigue, Lenaic, additional, and Lascialfari, Alessandro, additional

Published
2020
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39. Multifunctional Fe3O4-Au Nanoparticles for the MRI Diagnosis and Potential Treatment of Liver Cancer

Author

Kozenkova, Elena, primary, Levada, Kateryna, additional, Efremova, Maria V., additional, Omelyanchik, Alexander, additional, Nalench, Yulia A., additional, Garanina, Anastasiia S., additional, Pshenichnikov, Stanislav, additional, Zhukov, Dmitry G., additional, Lunov, Oleg, additional, Lunova, Mariia, additional, Kozenkov, Ivan, additional, Innocenti, Claudia, additional, Albino, Martin, additional, Abakumov, Maxim A., additional, Sangregorio, Claudio, additional, and Rodionova, Valeria, additional

Published
2020
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41. Unraveling the mechanism of the one-pot synthesis of exchange coupled Co-based nano-heterostructures with a high energy product

Author

Muzzi, Beatrice, primary, Albino, Martin, additional, Innocenti, Claudia, additional, Petrecca, Michele, additional, Cortigiani, Brunetto, additional, Fernández, César de Julián, additional, Bertoni, Giovanni, additional, Fernandez-Pacheco, Rodrigo, additional, Ibarra, Alfonso, additional, Marquina, Clara, additional, Ibarra, M. Ricardo, additional, and Sangregorio, Claudio, additional

Published
2020
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42. Dual pH- and temperature-responsive magnetic nanocomposite for controlled drug delivery

Author

ESLAMI, PARISA, SANGREGORIO, CLAUDIO, CANESCHI, ANDREA, BALDI, GIOVANNI, PETRECCA, MICHELE, ALBINO, MARTIN, GUERRINI, ANDREA, INNOCENTI, CLAUDIA, Saer, Duomett, CHIELLINI, FEDERICA, Andrea, Morelli, and Laura, Cappiello

Subjects
Nanomedicine, Drug delivery, Magnetic hyperthermia, Controlled drug release, Thermoresponsive polymer, Magnetic nanoparticles, Doxorubicin, Melanoma cell
Published
2019

43. Star-Shaped Magnetic-Plasmonic Au@Fe3O4Nano-Heterostructures for Photothermal Therapy

Author

Muzzi, Beatrice, Albino, Martin, Gabbani, Alessio, Omelyanchik, Alexander, Kozenkova, Elena, Petrecca, Michele, Innocenti, Claudia, Balica, Elena, Lavacchi, Alessandro, Scavone, Francesca, Anceschi, Cecilia, Petrucci, Gaia, Ibarra, Alfonso, Laurenzana, Anna, Pineider, Francesco, Rodionova, Valeria, and Sangregorio, Claudio

Abstract

Here, we synthesize a Au@Fe3O4core@shell system with a highly uniform unprecedented star-like shell morphology with combined plasmonic and magnetic properties. An advanced electron microscopy characterization allows assessing the multifaceted nature of the Au core and its role in the growth of the peculiar epitaxial star-like shell with excellent crystallinity and homogeneity. Magnetometry and magneto-optical spectroscopy revealed a pure magnetite shell, with a superior saturation magnetization compared to similar Au@Fe3O4heterostructures reported in the literature, which is ascribed to the star-like morphology, as well as to the large thickness of the shell. Of note, Au@Fe3O4nanostar-loaded cancer cells displayed magneto-mechanical stress under a low frequency external alternating magnetic field (few tens of Hz). On the other hand, such a uniform, homogeneous, and thick magnetite shell enables the shift of the plasmonic resonance of the Au core to 640 nm, which is the largest red shift achievable in Au@Fe3O4homogeneous core@shell systems, prompting application in photothermal therapy and optical imaging in the first biologically transparent window. Preliminary experiments performing irradiation of a stable water suspension of the nanostar and Au@Fe3O4-loaded cancer cell culture suspension at 658 nm confirmed their optical response and their suitability for photothermal therapy. The outstanding features of the prepared system can be thus potentially exploited as a multifunctional platform for magnetic-plasmonic applications.

Published
2022
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47. Role of Zn2+ Substitution on the Magnetic, Hyperthermic, and Relaxometric Properties of Cobalt Ferrite Nanoparticles

Author

Albino, Martin, primary, Fantechi, Elvira, additional, Innocenti, Claudia, additional, López-Ortega, Alberto, additional, Bonanni, Valentina, additional, Campo, Giulio, additional, Pineider, Francesco, additional, Gurioli, Massimo, additional, Arosio, Paolo, additional, Orlando, Tomas, additional, Bertoni, Giovanni, additional, de Julián Fernández, Cesar, additional, Lascialfari, Alessandro, additional, and Sangregorio, Claudio, additional

Published
2019
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50. Formation and magnetic manipulation of periodically aligned microchains in thin plastic membranes.

Author

Lorenzo, Daniela, Fragouli, Despina, Bertoni, Giovanni, Innocenti, Claudia, Anyfantis, George C., Davide Cozzoli, P., Cingolani, Roberto, and Athanassiou, Athanassia

Subjects
ARTIFICIAL membranes, POLYMER research, MAGNETIC fields, NANOPARTICLES, DYNAMICS, SIMULATION methods & models
Abstract

We demonstrate the fabrication of polymeric membranes that incorporate a few layers of periodically aligned magnetic microchains formed upon the application of variable magnetic fields. A homogeneous solution containing an elastomeric polymer and a small amount of colloidal magnetic nanoparticles is spin coated on glass slides, thereby forming thin magnetic membranes of ca. 10 μm thickness. Subsequent application of a homogeneous magnetic field results in the orientation of the magnetic clusters and their further motion into the matrix along the field lines forming layers of aligned chains. The study of the kinetics of alignment demonstrates that the chains are formed in the first hour of exposure to the magnetic field. Above all, a detailed microscopy study reveals that the dimensions and the periodicity of the microchains are effectively controlled by the intensity of the magnetic field, in good agreement with the theoretical simulations. This ability to form and manipulate the size and the distribution of chains into the polymeric matrix gives the opportunity to develop multifunctional composite materials ready to be used in various applications such as electromagnetic shielding, or multifunctional magnetic membranes etc. [ABSTRACT FROM AUTHOR]

Published
2012
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