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García DG, Garzón-Romero C, Salazar MA, Lagos KJ, Campaña KO, Debut A, Vizuete K, Rivera MR, Niebieskikwiat D, Benitez MJ, Romero MP. Bioinspired Synthesis of Magnetic Nanoparticles Based on Iron Oxides Using Orange Waste and Their Application as Photo-Activated Antibacterial Agents. Int J Mol Sci 2023; 24:ijms24054770. [PMID: 36902198 PMCID: PMC10002579 DOI: 10.3390/ijms24054770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 01/26/2023] [Accepted: 01/31/2023] [Indexed: 03/06/2023] Open
Abstract
Magnetic nanoparticles based on iron oxides (MNPs-Fe) have been proposed as photothermal agents (PTAs) within antibacterial photothermal therapy (PTT), aiming to counteract the vast health problem of multidrug-resistant bacterial infections. We present a quick and easy green synthesis (GS) to prepare MNPs-Fe harnessing waste. Orange peel extract (organic compounds) was used as a reducing, capping, and stabilizing agent in the GS, which employed microwave (MW) irradiation to reduce the synthesis time. The produced weight, physical-chemical features and magnetic features of the MNPs-Fe were studied. Moreover, their cytotoxicity was assessed in animal cell line ATCC RAW 264.7, as well as their antibacterial activity against Staphylococcus aureus and Escherichia coli. We found that the 50GS-MNPs-Fe sample (prepared by GS, with 50% v/v of NH4OH and 50% v/v of orange peel extract) had an excellent mass yield. Its particle size was ~50 nm with the presence of an organic coating (terpenes or aldehydes). We believe that this coating improved the cell viability in extended periods (8 days) of cell culture with concentrations lower than 250 µg·mL-1, with respect to the MNPs-Fe obtained by CO and single MW, but it did not influence the antibacterial effect. The bacteria inhibition was attributed to the plasmonic of 50GS-MNPs-Fe (photothermal effect) by irradiation with red light (630 nm, 65.5 mW·cm-2, 30 min). We highlight the superparamagnetism of the 50GS-MNPs-Fe over 60 K in a broader temperature range than the MNPs-Fe obtained by CO (160.09 K) and MW (211.1 K). Therefore, 50GS-MNPs-Fe could be excellent candidates as broad-spectrum PTAs in antibacterial PTT. Furthermore, they might be employed in magnetic hyperthermia, magnetic resonance imaging, oncological treatments, and so on.
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Affiliation(s)
| | - Cristina Garzón-Romero
- Laboratorio de Investigación en Citogenética y Biomoléculas de Anfibios (LICBA), Centro de Investigación para la Salud en América Latina (CISeAL), Facultad de Ciencias Exactas y Naturales, Pontificia Universidad Católica del Ecuador (PUCE), Quito 170143, Ecuador
| | - Mateo Alejandro Salazar
- Laboratorio de Investigación en Citogenética y Biomoléculas de Anfibios (LICBA), Centro de Investigación para la Salud en América Latina (CISeAL), Facultad de Ciencias Exactas y Naturales, Pontificia Universidad Católica del Ecuador (PUCE), Quito 170143, Ecuador
| | - Karina J. Lagos
- Department of Materials, Escuela Politécnica Nacional (EPN), Quito 170525, Ecuador
| | | | - Alexis Debut
- Centro de Nanociencia y Nanotecnología, Universidad de Las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador
| | - Karla Vizuete
- Centro de Nanociencia y Nanotecnología, Universidad de Las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador
| | - Miryan Rosita Rivera
- Laboratorio de Investigación en Citogenética y Biomoléculas de Anfibios (LICBA), Centro de Investigación para la Salud en América Latina (CISeAL), Facultad de Ciencias Exactas y Naturales, Pontificia Universidad Católica del Ecuador (PUCE), Quito 170143, Ecuador
| | - Dario Niebieskikwiat
- Departamento de Física, Colegio de Ciencias e Ingenierías, Universidad San Francisco de Quito, Quito 170901, Ecuador
| | - Maria J. Benitez
- Departamento de Física, Escuela Politécnica Nacional (EPN), Quito 170525, Ecuador
| | - María Paulina Romero
- Department of Materials, Escuela Politécnica Nacional (EPN), Quito 170525, Ecuador
- Correspondence:
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2
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Nobile C, Cozzoli PD. Synthetic Approaches to Colloidal Nanocrystal Heterostructures Based on Metal and Metal-Oxide Materials. NANOMATERIALS 2022; 12:nano12101729. [PMID: 35630951 PMCID: PMC9147683 DOI: 10.3390/nano12101729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 04/30/2022] [Accepted: 05/09/2022] [Indexed: 12/04/2022]
Abstract
Composite inorganic nanoarchitectures, based on combinations of distinct materials, represent advanced solid-state constructs, where coexistence and synergistic interactions among nonhomologous optical, magnetic, chemical, and catalytic properties lay a basis for the engineering of enhanced or even unconventional functionalities. Such systems thus hold relevance for both theoretical and applied nanotechnology-based research in diverse areas, spanning optics, electronics, energy management, (photo)catalysis, biomedicine, and environmental remediation. Wet-chemical colloidal synthetic techniques have now been refined to the point of allowing the fabrication of solution free-standing and easily processable multicomponent nanocrystals with sophisticated modular heterostructure, built upon a programmed spatial distribution of the crystal phase, composition, and anchored surface moieties. Such last-generation breeds of nanocrystals are thus composed of nanoscale domains of different materials, assembled controllably into core/shell or heteromer-type configurations through bonding epitaxial heterojunctions. This review offers a critical overview of achievements made in the design and synthetic elaboration of colloidal nanocrystal heterostructures based on diverse associations of transition metals (with emphasis on plasmonic metals) and transition-metal oxides. Synthetic strategies, all leveraging on the basic seed-mediated approach, are described and discussed with reference to the most credited mechanisms underpinning regioselective heteroepitaxial deposition. The unique properties and advanced applications allowed by such brand-new nanomaterials are also mentioned.
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Affiliation(s)
- Concetta Nobile
- CNR NANOTEC—Institute of Nanotechnology, UOS di Lecce, c/o Campus Ecotekne, Via Monteroni, 73100 Lecce, Italy;
| | - Pantaleo Davide Cozzoli
- Department of Mathematics and Physics “Ennio De Giorgi”, c/o Campus Ecotekne, University of Salento, Via Monteroni, 73100 Lecce, Italy
- UdR INSTM di Lecce, c/o Campus Ecotekne, University of Salento, Via Arnesano, 73100 Lecce, Italy
- Correspondence:
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3
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Significant Surface Spin Effects and Exchange Bias in Iron Oxide-Based Hollow Magnetic Nanoparticles. NANOMATERIALS 2022; 12:nano12030456. [PMID: 35159800 PMCID: PMC8838860 DOI: 10.3390/nano12030456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 12/22/2021] [Accepted: 01/08/2022] [Indexed: 12/03/2022]
Abstract
Exchange bias (EB) properties have become especially important in hollow magnetic nanoparticles (MNPs) due to the versatility and reduced size of these materials. In this work, we present the synthesis and study of the EB properties of iron-oxide-based hollow MNPs and their precursors Fe/iron oxide MNPs with core/void/shell structure. The two mechanisms involved in EB generation were investigated: the frozen spins present in the nanograins that form the nanoparticles and the surface spins. The effect of external parameters on the coercivity (HC), remanence (MR), exchange bias field (HEB) and frozen spins, such as cooling field (HFC) and temperature, was investigated. Both HC and HEB present a maximum threshold above which their values begin to decrease with HFC, showing a new trend of HEB with HFC and allowing modulation on demand. The existence of surface spins, present on the outer and inner surfaces, was demonstrated, and an intrinsic EB phenomenon (HEB = 444 Oe for hollow iron oxide-based MNPs of 13.1 nm) with significant magnetization (MS~50 emu/g) was obtained. Finally, core/void/shell MNPs of 11.9 nm prior to the formation of the hollow MNPs showed a similar behavior, with non-negligible HEB, highlighting the importance of surface spins in EB generation.
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4
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Silva FG, Depeyrot J, Raikher YL, Stepanov VI, Poperechny IS, Aquino R, Ballon G, Geshev J, Dubois E, Perzynski R. Exchange-bias and magnetic anisotropy fields in core-shell ferrite nanoparticles. Sci Rep 2021; 11:5474. [PMID: 33750828 PMCID: PMC7970917 DOI: 10.1038/s41598-021-84843-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 02/22/2021] [Indexed: 11/09/2022] Open
Abstract
Exchange bias properties of MnFe\documentclass[12pt]{minimal}
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\begin{document}$$\gamma$$\end{document}γ–Fe\documentclass[12pt]{minimal}
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\begin{document}$$_3$$\end{document}3 core–shell nanoparticles are investigated. The measured field and temperature dependencies of the magnetization point out a well-ordered ferrimagnetic core surrounded by a layer with spin glass-like arrangement. Quasi-static SQUID magnetization measurements are presented along with high-amplitude pulse ones and are cross-analyzed by comparison against ferromagnetic resonance experiments at 9 GHz. These measurements allow one to discern three types of magnetic anisotropies affecting the dynamics of the magnetic moment of the well-ordered ferrimagnetic NP’s core viz. the easy-axis (uniaxial) anisotropy, the unidirectional exchange-bias anisotropy and the rotatable anisotropy. The uniaxial anisotropy originates from the structural core–shell interface. The unidirectional exchange-bias anisotropy is associated with the spin-coupling at the ferrimagnetic/spin glass-like interface; it is observable only at low temperatures after a field-cooling process. The rotatable anisotropy is caused by partially-pinned spins at the core/shell interface; it manifests itself as an intrinsic field always parallel to the external applied magnetic field. The whole set of experimental results is interpreted in the framework of superparamagnetic theory, i.e., essentially taking into account the effect of thermal fluctuations on the magnetic moment of the particle core. In particular, it is found that the rotatable anisotropy of our system is of a uniaxial type.
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Affiliation(s)
- F G Silva
- Instituto de Física, Universidade de Brasília, Caixa Postal 04455, Brasília, 70919-970, Brazil. .,Sorbonne Université, CNRS, PHENIX UMR 8234, 75005, Paris, France. .,Faculdade UnB Planaltina, Universidade de Brasília, Planaltina (DF), 73345-010, Brazil.
| | - J Depeyrot
- Instituto de Física, Universidade de Brasília, Caixa Postal 04455, Brasília, 70919-970, Brazil
| | - Yu L Raikher
- Institute of Continuous Media Mechanics, Ural Branch of RAS, Perm, 614068, Russia.,Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, 620083, Russia
| | - V I Stepanov
- Institute of Continuous Media Mechanics, Ural Branch of RAS, Perm, 614068, Russia
| | - I S Poperechny
- Institute of Continuous Media Mechanics, Ural Branch of RAS, Perm, 614068, Russia.,Department of Phase Transitions Physics, Perm State National Research University, Perm, 614990, Russia
| | - R Aquino
- Faculdade UnB Planaltina, Universidade de Brasília, Planaltina (DF), 73345-010, Brazil
| | - G Ballon
- CNRS-LNCMI, 31400, Toulouse, France
| | - J Geshev
- Instituto de Fisica, UFRGS, Porto Alegre, RS, 91501-970, Brazil
| | - E Dubois
- Sorbonne Université, CNRS, PHENIX UMR 8234, 75005, Paris, France
| | - R Perzynski
- Sorbonne Université, CNRS, PHENIX UMR 8234, 75005, Paris, France
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5
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Lavorato GC, Das R, Alonso Masa J, Phan MH, Srikanth H. Hybrid magnetic nanoparticles as efficient nanoheaters in biomedical applications. NANOSCALE ADVANCES 2021; 3:867-888. [PMID: 36133290 PMCID: PMC9418677 DOI: 10.1039/d0na00828a] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 01/06/2021] [Indexed: 05/04/2023]
Abstract
Heating at the nanoscale is the basis of several biomedical applications, including magnetic hyperthermia therapies and heat-triggered drug delivery. The combination of multiple inorganic materials in hybrid magnetic nanoparticles provides versatile platforms to achieve an efficient heat delivery upon different external stimuli or to get an optical feedback during the process. However, the successful design and application of these nanomaterials usually require intricate synthesis routes and their magnetic response is still not fully understood. In this review we give an overview of the novel systems reported in the last few years, which have been mostly obtained by organic phase-based synthesis and epitaxial growth processes. Since the heating efficiency of hybrid magnetic nanoparticles often relies on the exchange-interaction between their components, we discuss various interface-phenomena that are responsible for their magnetic properties. Finally, followed by a brief comment on future directions in the field, we outline recent advances on multifunctional nanoparticles that can boost the heating power with light and combine heating and temperature sensing in a single nanomaterial.
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Affiliation(s)
- Gabriel C Lavorato
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA-CONICET), Universidad Nacional de La Plata 1900 La Plata Argentina
| | - Raja Das
- Faculty of Materials Science and Engineering and Phenikaa Institute for Advanced Study (PIAS), Phenikaa University Hanoi 10000 Vietnam
- Phenikaa Research and Technology Institute (PRATI), A&A Green Phoenix Group 167 Hoang Ngan Hanoi 10000 Vietnam
| | | | - Manh-Huong Phan
- Department of Physics, University of South Florida 33620 Tampa FL USA
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6
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Khurshid H, Abdu YA, Devlin E, Issa BA, Hadjipanayis GC. Chemically synthesized nanoparticles of iron and iron-carbides. RSC Adv 2020; 10:28958-28964. [PMID: 35520054 PMCID: PMC9055881 DOI: 10.1039/d0ra02996c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 07/29/2020] [Indexed: 11/23/2022] Open
Abstract
In this paper, we report a one-pot chemical synthesis technique for the preparation of iron and iron-carbide nanoparticles. Mössbauer spectroscopy, X-ray diffraction and magnetometry were used as the main tools to identify the different phases of Fe–C present. The influence of experimental parameters on the structural and compositional properties of nanoparticles was investigated in detail. These particles show ferromagnetic behavior with room temperature coercivity higher than 300 Oe. The X-ray diffraction was complemented by Mössbauer spectroscopy and thermo-magnetic analysis. Remarkably, the carbon content in iron-carbide nanoparticles (carbon rich or carbon poor iron-carbides) can be modulated simply by varying the experimental conditions, like the reaction time, temperature and iron precursor concentration. Magnetic properties can be tailored based upon crystallographic structure and particles composition. In this paper, we report a one-pot chemical synthesis for the preparation of iron and iron-carbide nanoparticles.![]()
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Affiliation(s)
- Hafsa Khurshid
- Department of Applied Physics and Astronomy, University of Sharjah Sharjah UAE .,Research Institute for Medical and Health Sciences (RIMHS), University of Sharjah Sharjah UAE.,Dartmouth Hitchcock Medical Center, Department of Radiology Lebanon NH USA
| | - Yassir A Abdu
- Department of Applied Physics and Astronomy, University of Sharjah Sharjah UAE
| | - Eamonn Devlin
- National Center for Scientific Research, Demokritos Greece
| | - Bashar Afif Issa
- Research Institute for Medical and Health Sciences (RIMHS), University of Sharjah Sharjah UAE.,Department of Medical Diagnostic Imaging, University of Sharjah Sharjah UAE
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7
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M. Jefremovas E, Alonso J, de la Fuente Rodríguez M, Rodríguez Fernández J, Espeso JI, Rojas DP, García-Prieto A, Fernández-Gubieda ML, Fernández Barquín L. Investigating the Size and Microstrain Influence in the Magnetic Order/Disorder State of GdCu 2 Nanoparticles. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E1117. [PMID: 32516996 PMCID: PMC7353466 DOI: 10.3390/nano10061117] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 05/20/2020] [Accepted: 06/02/2020] [Indexed: 05/27/2023]
Abstract
A series of GdCu 2 nanoparticles with controlled sizes ranging from 7 nm to 40 nm has been produced via high-energy inert-gas ball milling. Rietveld refinements on the X-ray diffraction measurements ensure that the bulk crystalline I m m a structure is retained within the nanoparticles, thanks to the employed low milling times ranging from t = 0.5 to t = 5 h. The analysis of the magnetic measurements shows a crossover from Superantiferromagnetism (SAF) to a Super Spin Glass state as the size decreases at NP size of 〈 D 〉 ≈ 18 nm. The microstrain contribution, which is always kept below 1%, together with the increasing surface-to-core ratio of the magnetic moments, trigger the magnetic disorder. Additionally, an extra contribution to the magnetic disorder is revealed within the SAF state, as the oscillating RKKY indirect exchange achieves to couple with the aforementioned contribution that emerges from the size reduction. The combination of both sources of disorder leads to a maximised frustration for 〈 D 〉 ≈ 25 nm sized NPs.
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Affiliation(s)
- E. M. Jefremovas
- Dpto. CITIMAC, Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain; (J.A.); (M.d.l.F.R.); (J.R.F.); (J.I.E.); (L.F.B.)
| | - J. Alonso
- Dpto. CITIMAC, Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain; (J.A.); (M.d.l.F.R.); (J.R.F.); (J.I.E.); (L.F.B.)
| | - M. de la Fuente Rodríguez
- Dpto. CITIMAC, Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain; (J.A.); (M.d.l.F.R.); (J.R.F.); (J.I.E.); (L.F.B.)
| | - J. Rodríguez Fernández
- Dpto. CITIMAC, Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain; (J.A.); (M.d.l.F.R.); (J.R.F.); (J.I.E.); (L.F.B.)
| | - J. I. Espeso
- Dpto. CITIMAC, Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain; (J.A.); (M.d.l.F.R.); (J.R.F.); (J.I.E.); (L.F.B.)
| | - D. P. Rojas
- Dpto. Estructuras y Física de la Edificación, ETSAM, Universidad Politécnica de Madrid, 28040 Madrid, Spain;
| | - A. García-Prieto
- Dpto. de Física Aplicada I, Escuela de Ingeniería de Bilbao, 48013 Bilbao, Spain;
| | - M. L. Fernández-Gubieda
- Dpto. de Electricidad y Electrónica, Universidad del País Vasco—UPV/EHU, 48940 Leioa, Spain;
| | - L. Fernández Barquín
- Dpto. CITIMAC, Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain; (J.A.); (M.d.l.F.R.); (J.R.F.); (J.I.E.); (L.F.B.)
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8
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Qadir MI, Weilhard A, Fernandes JA, de Pedro I, Vieira BJC, Waerenborgh JC, Dupont J. Selective Carbon Dioxide Hydrogenation Driven by Ferromagnetic RuFe Nanoparticles in Ionic Liquids. ACS Catal 2018. [DOI: 10.1021/acscatal.7b03804] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Muhammad I. Qadir
- Institute
of Chemistry, UFRGS, Av. Bento Gonçalves, 9500, Porto Alegre 91501-970, Rio Grande do Sul, Brazil
| | - Andreas Weilhard
- GSK
Carbon Neutral Laboratories for Sustainable Chemistry, University of Nottingham, NG8 2GT Nottingham, UK
| | - Jesum A. Fernandes
- GSK
Carbon Neutral Laboratories for Sustainable Chemistry, University of Nottingham, NG8 2GT Nottingham, UK
| | - Imanol de Pedro
- Departmento
CITIMAC, Facultad de Ciencias, Universidad de Cantabria, 390005 Santander, Spain
| | - Bruno J. C. Vieira
- Centro
de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal
| | - João C. Waerenborgh
- Centro
de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal
| | - Jairton Dupont
- Institute
of Chemistry, UFRGS, Av. Bento Gonçalves, 9500, Porto Alegre 91501-970, Rio Grande do Sul, Brazil
- GSK
Carbon Neutral Laboratories for Sustainable Chemistry, University of Nottingham, NG8 2GT Nottingham, UK
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9
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Najafishirtari S, Lak A, Guglieri C, Marras S, Brescia R, Fiorito S, Sadrollahi E, Litterst FJ, Pellegrino T, Manna L, Colombo M. Manipulating the morphology of the nano oxide domain in AuCu–iron oxide dumbbell-like nanocomposites as a tool to modify magnetic properties. RSC Adv 2018; 8:22411-22421. [PMID: 35539741 PMCID: PMC9081108 DOI: 10.1039/c8ra03399d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 06/06/2018] [Indexed: 12/17/2022] Open
Abstract
We highlighted the effects of oleic acid on the structural and magnetic properties of colloidal nanodumbbells.
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Affiliation(s)
| | - Aidin Lak
- Nanomaterials for Biomedical Applications
- Istituto Italiano di Tecnologia
- 16163 Genoa
- Italy
| | | | - Sergio Marras
- Materials Characterization Facility
- Istituto Italiano di Tecnologia
- 16163 Genoa
- Italy
| | - Rosaria Brescia
- Electron Microscopy Facility
- Istituto Italiano di Tecnologia
- 16163 Genoa
- Italy
| | - Sergio Fiorito
- Nanomaterials for Biomedical Applications
- Istituto Italiano di Tecnologia
- 16163 Genoa
- Italy
- Università degli Studi di Genova
| | - Elaheh Sadrollahi
- Institut für Physik der Kondensierten Materie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Fred Jochen Litterst
- Institut für Physik der Kondensierten Materie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Teresa Pellegrino
- Nanomaterials for Biomedical Applications
- Istituto Italiano di Tecnologia
- 16163 Genoa
- Italy
| | - Liberato Manna
- Nanochemistry Department
- Istituto Italiano di Tecnologia
- 16163 Genoa
- Italy
| | - Massimo Colombo
- Nanochemistry Department
- Istituto Italiano di Tecnologia
- 16163 Genoa
- Italy
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10
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León Félix L, Coaquira JAH, Martínez MAR, Goya GF, Mantilla J, Sousa MH, Valladares LDLS, Barnes CHW, Morais PC. Structural and magnetic properties of core-shell Au/Fe 3O 4 nanoparticles. Sci Rep 2017; 7:41732. [PMID: 28165012 PMCID: PMC5292710 DOI: 10.1038/srep41732] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Accepted: 12/29/2016] [Indexed: 11/09/2022] Open
Abstract
We present a systematic study of core-shell Au/Fe3O4 nanoparticles produced by thermal decomposition under mild conditions. The morphology and crystal structure of the nanoparticles revealed the presence of Au core of d = (6.9 ± 1.0) nm surrounded by Fe3O4 shell with a thickness of ~3.5 nm, epitaxially grown onto the Au core surface. The Au/Fe3O4 core-shell structure was demonstrated by high angle annular dark field scanning transmission electron microscopy analysis. The magnetite shell grown on top of the Au nanoparticle displayed a thermal blocking state at temperatures below TB = 59 K and a relaxed state well above TB. Remarkably, an exchange bias effect was observed when cooling down the samples below room temperature under an external magnetic field. Moreover, the exchange bias field (HEX) started to appear at T~40 K and its value increased by decreasing the temperature. This effect has been assigned to the interaction of spins located in the magnetically disordered regions (in the inner and outer surface of the Fe3O4 shell) and spins located in the ordered region of the Fe3O4 shell.
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Affiliation(s)
- L León Félix
- Laboratory of Magnetic Characterization, Instituto de Física, Universidade de Brasília, DF 70910-900, Brasília, Brazil.,Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, 50018 Zaragoza, Spain
| | - J A H Coaquira
- Laboratory of Magnetic Characterization, Instituto de Física, Universidade de Brasília, DF 70910-900, Brasília, Brazil
| | - M A R Martínez
- Laboratory of Magnetic Characterization, Instituto de Física, Universidade de Brasília, DF 70910-900, Brasília, Brazil
| | - G F Goya
- Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, 50018 Zaragoza, Spain
| | - J Mantilla
- Laboratory of Magnetic Characterization, Instituto de Física, Universidade de Brasília, DF 70910-900, Brasília, Brazil
| | - M H Sousa
- Green Nanotechnology Group, Faculdade de Ceilândia, Universidade de Brasília, Ceilândia, DF 72220-900, Brasília, Brazil
| | - L de Los Santos Valladares
- Cavendish Laboratory, Department of Physics, University of Cambridge, J.J Thomson Av., Cambridge CB3 0HE, United Kingdom
| | - C H W Barnes
- Cavendish Laboratory, Department of Physics, University of Cambridge, J.J Thomson Av., Cambridge CB3 0HE, United Kingdom
| | - P C Morais
- Laboratory of Magnetic Characterization, Instituto de Física, Universidade de Brasília, DF 70910-900, Brasília, Brazil.,School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China
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Phan MH, Alonso J, Khurshid H, Lampen-Kelley P, Chandra S, Stojak Repa K, Nemati Z, Das R, Iglesias Ó, Srikanth H. Exchange Bias Effects in Iron Oxide-Based Nanoparticle Systems. NANOMATERIALS 2016; 6:nano6110221. [PMID: 28335349 PMCID: PMC5245749 DOI: 10.3390/nano6110221] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 10/29/2016] [Accepted: 11/02/2016] [Indexed: 11/16/2022]
Abstract
The exploration of exchange bias (EB) on the nanoscale provides a novel approach to improving the anisotropic properties of magnetic nanoparticles for prospective applications in nanospintronics and nanomedicine. However, the physical origin of EB is not fully understood. Recent advances in chemical synthesis provide a unique opportunity to explore EB in a variety of iron oxide-based nanostructures ranging from core/shell to hollow and hybrid composite nanoparticles. Experimental and atomistic Monte Carlo studies have shed light on the roles of interface and surface spins in these nanosystems. This review paper aims to provide a thorough understanding of the EB and related phenomena in iron oxide-based nanoparticle systems, knowledge of which is essential to tune the anisotropic magnetic properties of exchange-coupled nanoparticle systems for potential applications.
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Affiliation(s)
- Manh-Huong Phan
- Department of Physics, University of South Florida, Tampa, FL 33620, USA.
| | - Javier Alonso
- Department of Physics, University of South Florida, Tampa, FL 33620, USA.
- BCMaterials Building 500, Bizkaia Science and Technology Park, 48160 Derio, Spain.
| | - Hafsa Khurshid
- Department of Physics, University of South Florida, Tampa, FL 33620, USA.
| | | | - Sayan Chandra
- Department of Physics, University of South Florida, Tampa, FL 33620, USA.
| | | | - Zohreh Nemati
- Department of Physics, University of South Florida, Tampa, FL 33620, USA.
| | - Raja Das
- Department of Physics, University of South Florida, Tampa, FL 33620, USA.
| | - Óscar Iglesias
- Department of Fundamental Physics and Institute of Nanoscience and Nanotechnology (In2UB), University of Barcelona, Av. Diagonal 647, 08028 Barcelona, Spain.
| | - Hariharan Srikanth
- Department of Physics, University of South Florida, Tampa, FL 33620, USA.
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Nemati Z, Alonso J, Khurshid H, Phan MH, Srikanth H. Core/shell iron/iron oxide nanoparticles: are they promising for magnetic hyperthermia? RSC Adv 2016. [DOI: 10.1039/c6ra05064f] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Core/shell iron/iron oxide nanoparticles are promising for magnetic hyperthermia provided their size is big enough (>14 nm) in order to minimize surface disorder and hollowing effects that seriously deteriorate their heating efficiency.
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Affiliation(s)
- Z. Nemati
- Materials Institute
- Department of Physics
- University of South Florida
- Tampa
- USA
| | - J. Alonso
- Materials Institute
- Department of Physics
- University of South Florida
- Tampa
- USA
| | - H. Khurshid
- Materials Institute
- Department of Physics
- University of South Florida
- Tampa
- USA
| | - M. H. Phan
- Materials Institute
- Department of Physics
- University of South Florida
- Tampa
- USA
| | - H. Srikanth
- Materials Institute
- Department of Physics
- University of South Florida
- Tampa
- USA
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