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Sanna Angotzi M, Mameli V, Zákutná D, Secci F, Xin HL, Cannas C. Hard-Soft Core-Shell Architecture Formation from Cubic Cobalt Ferrite Nanoparticles. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13101679. [PMID: 37242095 DOI: 10.3390/nano13101679] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 05/08/2023] [Accepted: 05/17/2023] [Indexed: 05/28/2023]
Abstract
Cubic bi-magnetic hard-soft core-shell nanoarchitectures were prepared starting from cobalt ferrite nanoparticles, prevalently with cubic shape, as seeds to grow a manganese ferrite shell. The combined use of direct (nanoscale chemical mapping via STEM-EDX) and indirect (DC magnetometry) tools was adopted to verify the formation of the heterostructures at the nanoscale and bulk level, respectively. The results showed the obtainment of core-shell NPs (CoFe2O4@MnFe2O4) with a thin shell (heterogenous nucleation). In addition, manganese ferrite was found to homogeneously nucleate to form a secondary nanoparticle population (homogenous nucleation). This study shed light on the competitive formation mechanism of homogenous and heterogenous nucleation, suggesting the existence of a critical size, beyond which, phase separation occurs and seeds are no longer available in the reaction medium for heterogenous nucleation. These findings may allow one to tailor the synthesis process in order to achieve better control of the materials' features affecting the magnetic behaviour, and consequently, the performances as heat mediators or components for data storage devices.
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Affiliation(s)
- Marco Sanna Angotzi
- Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria S.S. 554 Bivio per Sestu, 09042 Monserrato, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via Giuseppe Giusti 9, 50121 Florence, Italy
| | - Valentina Mameli
- Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria S.S. 554 Bivio per Sestu, 09042 Monserrato, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via Giuseppe Giusti 9, 50121 Florence, Italy
| | - Dominika Zákutná
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic
| | - Fausto Secci
- Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria S.S. 554 Bivio per Sestu, 09042 Monserrato, Italy
| | - Huolin L Xin
- Department of Physics and Astronomy, University of California, Irvine, CA 92617, USA
| | - Carla Cannas
- Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria S.S. 554 Bivio per Sestu, 09042 Monserrato, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via Giuseppe Giusti 9, 50121 Florence, Italy
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Deng Y, Li S, Dewil R, Appels L, Yang M, Zhang H, Baeyens J. Water splitting by MnFe 2O 4/Na 2CO 3 reversible redox reactions. RSC Adv 2022; 12:31392-31401. [PMID: 36349048 PMCID: PMC9627460 DOI: 10.1039/d2ra05319e] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 10/05/2022] [Indexed: 09/07/2024] Open
Abstract
Future energy systems must call upon clean and renewable sources capable of reducing associated CO2 emissions. The present research opens new perspectives for renewable energy-based hydrogen production by water splitting using metal oxide oxidation/reduction reactants. An earlier multicriteria assessment defined top priorities, with MnFe2O4/Na2CO3/H2O and Mn3O4/MnO/NaMnO2/H2O multistep redox cycles having the highest potential. The latter redox system was previously assessed and proven difficult to be conducted. The former redox system was hence experimentally investigated in the present research at the 0.5 to 250 g scale in isothermal thermogravimetry, an electrically heated furnace, and a concentrated solar reactor. Over 30 successive oxidation/reduction cycles were assessed, and the H2 production efficiencies exceeded 98 % for the coprecipitated reactant after these multiple cycles. Tentative economics using a coprecipitated reactant revealed that 120 cycles are needed to achieve a 1 € per kg H2 cost. Improving the cheaper ball-milled reactant could reduce costs by approximately 30 %. The initial results confirm that future research is important.
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Affiliation(s)
- Yimin Deng
- KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab 2860 Sint-Katelijne-Waver Belgium
| | - Shuo Li
- Beijing University of Chemical Technology, Beijing Advanced Innovation Centre of Soft Matter Science and Engineering 100029 Beijing China
| | - Raf Dewil
- KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab 2860 Sint-Katelijne-Waver Belgium
- University of Oxford, Department of Engineering Science Parks Road Oxford OX3 3PJ UK
| | - Lise Appels
- KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab 2860 Sint-Katelijne-Waver Belgium
| | - Miao Yang
- Beijing University of Chemical Technology, Beijing Advanced Innovation Centre of Soft Matter Science and Engineering 100029 Beijing China
| | - Huili Zhang
- Beijing University of Chemical Technology, School of Life Science and Technology 100029 Beijing China
| | - Jan Baeyens
- KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab 2860 Sint-Katelijne-Waver Belgium
- Beijing University of Chemical Technology, Beijing Advanced Innovation Centre of Soft Matter Science and Engineering 100029 Beijing China
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Sanna Angotzi M, Mameli V, Fantasia A, Cara C, Secci F, Enzo S, Gerina M, Cannas C. As (III, V) Uptake from Nanostructured Iron Oxides and Oxyhydroxides: The Complex Interplay between Sorbent Surface Chemistry and Arsenic Equilibria. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:326. [PMID: 35159671 PMCID: PMC8840107 DOI: 10.3390/nano12030326] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 01/14/2022] [Accepted: 01/18/2022] [Indexed: 01/27/2023]
Abstract
Iron oxides/oxyhydroxides, namely maghemite, iron oxide-silica composite, akaganeite, and ferrihydrite, are studied for AsV and AsIII removal from water in the pH range 2-8. All sorbents were characterized for their structural, morphological, textural, and surface charge properties. The same experimental conditions for the batch tests permitted a direct comparison among the sorbents, particularly between the oxyhydroxides, known to be among the most promising As-removers but hardly compared in the literature. The tests revealed akaganeite to perform better in the whole pH range for AsV (max 89 mg g-1 at pH0 3) but to be also efficient toward AsIII (max 91 mg g-1 at pH0 3-8), for which the best sorbent was ferrihydrite (max 144 mg g-1 at pH0 8). Moreover, the study of the sorbents' surface chemistry under contact with arsenic and arsenic-free solutions allowed the understanding of its role in the arsenic uptake through electrophoretic light scattering and pH measurements. Indeed, the sorbent's ability to modify the starting pH was a crucial step in determining the removal of performances. The AsV initial concentration, contact time, ionic strength, and presence of competitors were also studied for akaganeite, the most promising remover, at pH0 3 and 8 to deepen the uptake mechanism.
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Affiliation(s)
- Marco Sanna Angotzi
- Department of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, Italy; (M.S.A.); (A.F.); (C.C.); (F.S.); (C.C.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via Giuseppe Giusti 9, 50121 Firenze, Italy
| | - Valentina Mameli
- Department of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, Italy; (M.S.A.); (A.F.); (C.C.); (F.S.); (C.C.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via Giuseppe Giusti 9, 50121 Firenze, Italy
| | - Alessandra Fantasia
- Department of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, Italy; (M.S.A.); (A.F.); (C.C.); (F.S.); (C.C.)
| | - Claudio Cara
- Department of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, Italy; (M.S.A.); (A.F.); (C.C.); (F.S.); (C.C.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via Giuseppe Giusti 9, 50121 Firenze, Italy
| | - Fausto Secci
- Department of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, Italy; (M.S.A.); (A.F.); (C.C.); (F.S.); (C.C.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via Giuseppe Giusti 9, 50121 Firenze, Italy
| | - Stefano Enzo
- Department of Chemistry and Pharmacy, University of Sassari, Via Vienna 2, 07100 Sassari, Italy;
| | - Marianna Gerina
- Department of Inorganic Chemistry, Charles University, Hlavova 8, 12800 Prague, Czech Republic;
| | - Carla Cannas
- Department of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, Italy; (M.S.A.); (A.F.); (C.C.); (F.S.); (C.C.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via Giuseppe Giusti 9, 50121 Firenze, Italy
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Sanna Angotzi M, Mameli V, Khanal S, Veverka M, Vejpravova J, Cannas C. Effect of different molecular coatings on the heating properties of maghemite nanoparticles. NANOSCALE ADVANCES 2022; 4:408-420. [PMID: 35178500 PMCID: PMC8765356 DOI: 10.1039/d1na00478f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 11/08/2021] [Indexed: 05/04/2023]
Abstract
In this work, the effect of different molecular coatings on the alternating magnetic field-induced heating properties of 15 nm maghemite nanoparticles (NPs) in water dispersions was studied at different frequencies (159-782 kHz) and field amplitudes (100-400 G). The original hydrophobic oleate coating was replaced with dimercaptosuccinic acid (DMSA) or polyethylene glycol trimethoxysilane (PEGTMS), while cetrimonium bromide (CTAB) or stearic acid-poloxamer 188 (SA-P188) was intercalated or encapsulated, respectively, to transfer the dispersions into water. Surface modification, based on intercalation processes, induced clustering phenomena with the formation of spherical-like assemblies (CTAB and SA-P188), while ligand-exchange strategies kept the particles isolated. The clustering phenomenon has detrimental effects on the heating performances compared with isolated systems, in line with the reduction of Brown relaxation times. Furthermore, broader comprehension of the heating phenomenon in this dynamic system is obtained by following the evolution of SPA and ILP with time and temperature beyond the initial stage.
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Affiliation(s)
- Marco Sanna Angotzi
- Department of Chemical and Geological Sciences, University of Cagliari S.S. 554 Bivio per Sestu, Monserrato 09042 CA Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM) Via Giuseppe Giusti 9 50121 Firenze (FI) Italy
| | - Valentina Mameli
- Department of Chemical and Geological Sciences, University of Cagliari S.S. 554 Bivio per Sestu, Monserrato 09042 CA Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM) Via Giuseppe Giusti 9 50121 Firenze (FI) Italy
| | - Shankar Khanal
- Department of Condensed Matter Physics, Charles University Ke Karlovu 5 12116 Prague 2 Czech Republic
| | - Miroslav Veverka
- Department of Condensed Matter Physics, Charles University Ke Karlovu 5 12116 Prague 2 Czech Republic
| | - Jana Vejpravova
- Department of Condensed Matter Physics, Charles University Ke Karlovu 5 12116 Prague 2 Czech Republic
| | - Carla Cannas
- Department of Chemical and Geological Sciences, University of Cagliari S.S. 554 Bivio per Sestu, Monserrato 09042 CA Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM) Via Giuseppe Giusti 9 50121 Firenze (FI) Italy
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Abbas M, Zhang J, Kotarba A, Chen J. Highly robust and efficient MnZnFe2O4 decorated fibrous KCC-SiO2 catalyst for the synthesis of light olefins from syngas. Catal Sci Technol 2022. [DOI: 10.1039/d1cy02350k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, high light olefin (C2–C4) selectivity is obtained through FTS reaction and using a novel and robust catalyst of KCC-SiO2 fibrous nanospheres decorated with MnZnFe2O4 NPs.
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Affiliation(s)
- Mohamed Abbas
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
- Ceramics Department, National Research Center, 12622 El Behouth Str., Cairo, Egypt
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China
| | - Juan Zhang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China
| | - Andrzej Kotarba
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Jiangang Chen
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China
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Sharma P, Jain A, Chatterjee R. Enhanced magnetic performance in exchange-coupled CoFe 2O 4-LaFeO 3nanocomposites. NANOTECHNOLOGY 2021; 33:105708. [PMID: 34844232 DOI: 10.1088/1361-6528/ac3e31] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 11/29/2021] [Indexed: 06/13/2023]
Abstract
Nanocomposite oxide system of (x)CoFe2O4-(100-x)LaFeO3with different weight percent of core-shell structured CoFe2O4(x = 0, 20, 40, 50, 80, 100) and LaFeO3were fabricated, via a two-step sol-gel wet-chemical synthesis technique. The phase formation of the composites was confirmed by x-ray diffraction and the structural parameters of both the phases were attained from the Rietveld refinement results of XRD patterns. The elemental composition and microstructure of the resulting nanocomposites were examined by using energy-dispersive x-ray spectroscopy and high-resolution transmission electron microscopy technique, respectively. The detailed magnetometry studies at 300 K and 5 K reveal that the inter-and intra-phase magnetic interactions affect the saturation magnetization (MS), remanence magnetization (MR) and coercivity (HC) values of this bi-magnetic system. The remarkable feature of 'pinched magnetic hysteresis loop' was evidenced in the [(50) CoFe2O4- (50)LaFeO3] composite, leading to a lesser magnetic loss factor and better magnetic performance of this sample. The report depicts an improved interfacial exchange coupling at 5 K, for the nanocomposites of core-shell morphology and offers an understanding or explanation of improved magnetic performance for the (50)CoFe2O4- (50)LaFeO3nanocomposite and opens up an important way to design new multiferroic applications in low magnetic fields.
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Affiliation(s)
- Priyanka Sharma
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Anjali Jain
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Ratnamala Chatterjee
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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