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Lv Y, Gong C, Dong Y, Choi HJ. Synthesis of rGO/CoFe 2O 4 Composite and Its Magnetorheological Characteristics. Materials (Basel) 2024; 17:1859. [PMID: 38673216 PMCID: PMC11051295 DOI: 10.3390/ma17081859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Revised: 04/09/2024] [Accepted: 04/13/2024] [Indexed: 04/28/2024]
Abstract
In this study, composite particles of rGO/CoFe2O4 were synthesized using a solvothermal method to fabricate a low-density magnetorheological (MR) material with enhanced sedimentation stability. The morphology and crystallographic features of rGO/CoFe2O4 were characterized via SEM, TEM, and XRD, and its magnetic properties were tested using VSM. The MR fluid was formulated by blending rGO/CoFe2O4 particles into silicone oil. Under different magnet strengths (H), a rotational rheometer was used to test its MR properties. Typical MR properties were observed, including shear stress, viscosity, storage/loss modulus, and dynamic yield stress (τdy) following the Herschel-Bulkley model reaching 200 Pa when H is 342 kA/m. Furthermore, the yield stress of the MR fluid follows a power law relation as H increases and the index changes from 2.0 (in the low H region) to 1.5 (in the high H region). Finally, its MR efficiency was calculated to be about 104% at H of 342 kA/m.
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Affiliation(s)
- Yang Lv
- School of Materials Science and Engineering, Harbin Institute of Technology Weihai, 2 West Wenhua Road, Weihai 264209, China; (Y.L.); (C.G.)
| | - Chengjie Gong
- School of Materials Science and Engineering, Harbin Institute of Technology Weihai, 2 West Wenhua Road, Weihai 264209, China; (Y.L.); (C.G.)
| | - Yuzhen Dong
- School of Materials Science and Engineering, Harbin Institute of Technology Weihai, 2 West Wenhua Road, Weihai 264209, China; (Y.L.); (C.G.)
| | - Hyoung Jin Choi
- Department of Polymer Science and Engineering, Inha University, Incheon 22212, Republic of Korea
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2
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Shi Y, Zhang Y, Song G, Sun Y, Ding G. Efficient removal of organic pollutants by activation of peroxydisulfate with the magnetic CoFe 2O 4/carbon nanotube composite. Environ Sci Pollut Res Int 2024; 31:6835-6846. [PMID: 38153579 DOI: 10.1007/s11356-023-31567-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Accepted: 12/11/2023] [Indexed: 12/29/2023]
Abstract
A magnetic composite of CoFe2O4 and carbon nanotube (CNT) was prepared using the solvothermal approach and then employed for the activation of peroxydisulfate (PDS) to degrade reactive black 5 (RB5) and other organic pollutants. Characterization results of the composite catalyst revealed the successful loading of spherical CoFe2O4 particles on CNTs, possessing abundant porosity as well as magnetic separation capability. Under the degradation conditions of 0.2 g/L CoFe2O4-CNT dosage and 4 mM PDS dosage, the removal efficiencies of 10 mg/L RB5 and other pollutants were in the range of 94.5 to ~ 100%. The effects of pH, co-existing ions/humic acid, and water matrices as well as the reusability of the catalyst were also investigated in detail. Furthermore, the degradation mechanism and pathway were proposed based on quenching experiments, LC-MS analysis, and density functional theory (DFT) calculations, and the toxicity of the degradation products was evaluated in the quantitative structure-activity relationship approach.
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Affiliation(s)
- Yawei Shi
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China
| | - Yi Zhang
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China
| | - Guobin Song
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China
| | - Ya Sun
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China
| | - Guanghui Ding
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China.
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3
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Abramovskis V, Zalite I, Maiorov M, Baronins J, Singh AK, Lapkovskis V, Goel S, Shishkin A. High-Temperature, Lightweight Ceramics with Nano-Sized Ferrites for EMI Shielding: Synthesis, Characterisation, and Potential Applications. Materials (Basel) 2023; 16:7615. [PMID: 38138758 PMCID: PMC10744912 DOI: 10.3390/ma16247615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 12/01/2023] [Accepted: 12/05/2023] [Indexed: 12/24/2023]
Abstract
The present study focuses on the synthesis and characterisation of a lightweight ceramic material with electromagnetic interference (EMI) shielding properties, achieved using mullite containing micrometre-sized hollow spheres (cenospheres) and CoFe2O4 nanoparticles. This research explores compositions with varying CoFe2O4 contents ranging from 0 up to 20 wt.%. Conventional sintering in an air atmosphere is carried out at a temperature between 1100 and 1300 °C. The addition of ferrite nanoparticles was found to enhance the process of sintering cenospheres, resulting in improved material density and mechanical properties. Furthermore, this study reveals a direct correlation between the concentration of ferrite nanoparticles and the electromagnetic properties of the material. By increasing the concentration of ferrite nanoparticles, the electromagnetic shielding effect of the material (saturation magnetisation (Ms) and remanent magnetisation (Mr)) was observed to strengthen. These findings provide valuable insights into designing and developing lightweight ceramic materials with enhanced electromagnetic shielding capabilities. The synthesized ceramic material holds promise for various applications that require effective electromagnetic shielding, such as in the electronics, telecommunications, and aerospace industries.
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Affiliation(s)
- Vitalijs Abramovskis
- Laboratory of Ecological Solutions and Sustainable Development of Materials, Institute of General Chemical Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Pulka 3, K-3, LV-1007 Riga, Latvia; (V.A.); (J.B.); (V.L.)
| | - Ilmars Zalite
- Institute of Materials and Surface Technologies, Riga Technical University, P. Valdena Iela 7, LV-1048 Riga, Latvia;
| | - Mikhail Maiorov
- Institute of Physics, University of Latvia, Miera Iela 32, LV-2169 Salaspils, Latvia;
| | - Janis Baronins
- Laboratory of Ecological Solutions and Sustainable Development of Materials, Institute of General Chemical Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Pulka 3, K-3, LV-1007 Riga, Latvia; (V.A.); (J.B.); (V.L.)
| | | | - Vjaceslavs Lapkovskis
- Laboratory of Ecological Solutions and Sustainable Development of Materials, Institute of General Chemical Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Pulka 3, K-3, LV-1007 Riga, Latvia; (V.A.); (J.B.); (V.L.)
| | - Saurav Goel
- School of Engineering, London South Bank University, London SE1 0AA, UK;
- Department of Mechanical Engineering, University of Petroleum and Energy Studies, Dehradun 248007, India
| | - Andrei Shishkin
- Laboratory of Ecological Solutions and Sustainable Development of Materials, Institute of General Chemical Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Pulka 3, K-3, LV-1007 Riga, Latvia; (V.A.); (J.B.); (V.L.)
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4
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You X, Yang S, Li F, Fan Q, Liu Y, Liang W. Electrochemical degradation of azo dye using granular activated carbon electrodes loaded with bimetallic oxides. Environ Technol 2023; 44:2631-2647. [PMID: 35113005 DOI: 10.1080/09593330.2022.2038275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 01/22/2022] [Indexed: 06/14/2023]
Abstract
The performance of granular activated carbon (GAC) loaded with different combinations of Fe, Co, Ni, Mn, and Ti was examined for the electrochemical degradation of an azo dye such as acid red B (AR-B). Among the bimetallic groups, the combination of Fe and Co exhibited the best degradation effect. X-ray diffraction and X-ray photoelectron spectroscopy revealed that the morphology of the catalyst is CoFe2O4, and scanning electron microscopy manifested that the catalyst is distributed on the GAC surface and holes. The initial pH, hydraulic retention time, and current intensively affected the decolourisation and degradation efficiencies of AR-B, while the electrolyte types and concentrations did not exert any considerable effect. Electron spin resonance spectroscopy indicated that strong signals of hydroxyl radicals are produced by the Fe-Co/GAC electrodes. Results from fluorescence spectroscopy and gas chromatography-mass spectrometry suggested that hydroxyl radicals preferentially attack azo bonds during the degradation of AR-B, forming a series of compounds, and these compounds are finally degraded into small molecules of organic acids, carbon dioxide, and water.
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Affiliation(s)
- Xinyu You
- College of Environmental Science & Engineering, Beijing Forestry University, Beijing, People's Republic of China
| | - Shuai Yang
- College of Environmental Science & Engineering, Beijing Forestry University, Beijing, People's Republic of China
| | - Feizhen Li
- College of Environmental Science & Engineering, Beijing Forestry University, Beijing, People's Republic of China
| | - Qianlong Fan
- College of Environmental Science & Engineering, Beijing Forestry University, Beijing, People's Republic of China
| | - Yu Liu
- College of Environmental Science & Engineering, Beijing Forestry University, Beijing, People's Republic of China
| | - Wenyan Liang
- College of Environmental Science & Engineering, Beijing Forestry University, Beijing, People's Republic of China
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5
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Panda A, Cho HK, Kim H. A Green Synthesis of CoFe 2O 4 Decorated ZIF-8 Composite for Electrochemical Oxygen Evolution. Int J Mol Sci 2023; 24:ijms24119585. [PMID: 37298534 DOI: 10.3390/ijms24119585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 05/30/2023] [Accepted: 05/30/2023] [Indexed: 06/12/2023] Open
Abstract
Low-cost, sustainable hydrogen production requires noble metal-free electrocatalysts for water splitting. In this study, we prepared zeolitic imidazolate frameworks (ZIF) decorated with CoFe2O4 spinel nanoparticles as active catalysts for oxygen evolution reaction (OER). The CoFe2O4 nanoparticles were synthesized by converting agricultural bio-waste (potato peel extract) into economically valuable electrode materials. The biogenic CoFe2O4 composite showed an overpotential of 370 mV at a current density of 10 mA cm-2 and a low Tafel slope of 283 mV dec-1, whereas the ZIF@CoFe2O4 composite prepared using an in situ hydrothermal method showed an overpotential of 105 mV at 10 mA cm-2 and a low Tafel slope of 43 mV dec-1 in a 1 M KOH medium. The results demonstrated an exciting prospect of high-performance noble metal-free electrocatalysts for low-cost, high-efficiency, and sustainable hydrogen production.
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Affiliation(s)
- Atanu Panda
- Department of Mechanical Engineering, Gachon University, Seongnam-si 13120, Gyeonggi-do, Republic of Korea
| | - Hang-Kyu Cho
- Department of Mechanical Engineering, Gachon University, Seongnam-si 13120, Gyeonggi-do, Republic of Korea
| | - Hansang Kim
- Department of Mechanical Engineering, Gachon University, Seongnam-si 13120, Gyeonggi-do, Republic of Korea
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6
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Zhao X, He C, Bai Q, Miao X, Cao C, Wu T. Magnetic CoFe 2O 4 and NiFe 2O 4 Induced Self-Assembled Graphene Nanoribbon Framework with Excellent Properties for Li-Ion Battery. Molecules 2023; 28:molecules28104069. [PMID: 37241810 DOI: 10.3390/molecules28104069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 05/09/2023] [Accepted: 05/10/2023] [Indexed: 05/28/2023] Open
Abstract
A magnetically induced self-assembled graphene nanoribbons (GNRs) method is reported to synthesize MFe2O4/GNRs (M = Co,Ni). It is found that MFe2O4 compounds not only locate on the surface of GNRs but anchor on the interlayers of GNRs in the diameter of less than 5 nm as well. The in situ growth of MFe2O4 and magnetic aggregation at the joints of GNRs act as crosslinking agents to solder GNRs to build a nest structure. Additionally, combining GNRs with MFe2O4 helps to improve the magnetism of the MFe2O4. As an anode material for Li+ ion batteries, MFe2O4/GNRs can provide high reversible capacity and cyclic stability (1432 mAh g-1 for CoFe2O4/GNRs and 1058 mAh g-1 for NiFe2O4 at 0.1 A g-1 over 80 cycles).
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Affiliation(s)
- Xiyu Zhao
- Key Laboratory of Hexi Corridor Resources Utilization of Gansu, School of Chemistry and Chemical Engineering, Hexi University, Zhangye 734000, China
- Henan Key Laboratory of Photovoltaic Materials, Henan University, Kaifeng 475001, China
| | - Chunyang He
- Key Laboratory of Hexi Corridor Resources Utilization of Gansu, School of Chemistry and Chemical Engineering, Hexi University, Zhangye 734000, China
| | - Qiujv Bai
- Key Laboratory of Hexi Corridor Resources Utilization of Gansu, School of Chemistry and Chemical Engineering, Hexi University, Zhangye 734000, China
| | - Xiangwen Miao
- Key Laboratory of Hexi Corridor Resources Utilization of Gansu, School of Chemistry and Chemical Engineering, Hexi University, Zhangye 734000, China
| | - Cheng Cao
- Key Laboratory of Hexi Corridor Resources Utilization of Gansu, School of Chemistry and Chemical Engineering, Hexi University, Zhangye 734000, China
| | - Tianli Wu
- Henan Key Laboratory of Photovoltaic Materials, Henan University, Kaifeng 475001, China
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Benedoue S, Benedet M, Gasparotto A, Gauquelin N, Orekhov A, Verbeeck J, Seraglia R, Pagot G, Rizzi GA, Balzano V, Gavioli L, Noto VD, Barreca D, Maccato C. Insights into the Photoelectrocatalytic Behavior of gCN-Based Anode Materials Supported on Ni Foams. Nanomaterials (Basel) 2023; 13:nano13061035. [PMID: 36985929 PMCID: PMC10057045 DOI: 10.3390/nano13061035] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 03/03/2023] [Accepted: 03/06/2023] [Indexed: 05/27/2023]
Abstract
Graphitic carbon nitride (gCN) is a promising n-type semiconductor widely investigated for photo-assisted water splitting, but less studied for the (photo)electrochemical degradation of aqueous organic pollutants. In these fields, attractive perspectives for advancements are offered by a proper engineering of the material properties, e.g., by depositing gCN onto conductive and porous scaffolds, tailoring its nanoscale morphology, and functionalizing it with suitable cocatalysts. The present study reports on a simple and easily controllable synthesis of gCN flakes on Ni foam substrates by electrophoretic deposition (EPD), and on their eventual decoration with Co-based cocatalysts [CoO, CoFe2O4, cobalt phosphate (CoPi)] via radio frequency (RF)-sputtering or electrodeposition. After examining the influence of processing conditions on the material characteristics, the developed systems are comparatively investigated as (photo)anodes for water splitting and photoelectrocatalysts for the degradation of a recalcitrant water pollutant [potassium hydrogen phthalate (KHP)]. The obtained results highlight that while gCN decoration with Co-based cocatalysts boosts water splitting performances, bare gCN as such is more efficient in KHP abatement, due to the occurrence of a different reaction mechanism. The related insights, provided by a multi-technique characterization, may provide valuable guidelines for the implementation of active nanomaterials in environmental remediation and sustainable solar-to-chemical energy conversion.
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Affiliation(s)
- Serge Benedoue
- Department of Chemical Sciences, Padova University and INSTM, 35131 Padova, Italy
- Laboratory of Applied Physical and Analytical Chemistry, Department of Inorganic Chemistry, Faculty of Science, University of Yaoundé, Yaoundé P.O. Box 812, Cameroon
| | - Mattia Benedet
- Department of Chemical Sciences, Padova University and INSTM, 35131 Padova, Italy
| | - Alberto Gasparotto
- Department of Chemical Sciences, Padova University and INSTM, 35131 Padova, Italy
- CNR-ICMATE and INSTM, Department of Chemical Sciences, Padova University, 35131 Padova, Italy
| | - Nicolas Gauquelin
- EMAT and NANOlab Center of Excellence, University of Antwerp, 2020 Antwerpen, Belgium
| | - Andrey Orekhov
- EMAT and NANOlab Center of Excellence, University of Antwerp, 2020 Antwerpen, Belgium
| | - Johan Verbeeck
- EMAT and NANOlab Center of Excellence, University of Antwerp, 2020 Antwerpen, Belgium
| | - Roberta Seraglia
- CNR-ICMATE and INSTM, Department of Chemical Sciences, Padova University, 35131 Padova, Italy
| | - Gioele Pagot
- Section of Chemistry for the Technology (ChemTech), Department of Industrial Engineering, University of Padova and INSTM, 35131 Padova, Italy
| | - Gian Andrea Rizzi
- Department of Chemical Sciences, Padova University and INSTM, 35131 Padova, Italy
- CNR-ICMATE and INSTM, Department of Chemical Sciences, Padova University, 35131 Padova, Italy
| | - Vincenzo Balzano
- Interdisciplinary Laboratories for Advanced Materials Physics (i-LAMP), Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, 25133 Brescia, Italy
| | - Luca Gavioli
- Interdisciplinary Laboratories for Advanced Materials Physics (i-LAMP), Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, 25133 Brescia, Italy
| | - Vito Di Noto
- Section of Chemistry for the Technology (ChemTech), Department of Industrial Engineering, University of Padova and INSTM, 35131 Padova, Italy
| | - Davide Barreca
- CNR-ICMATE and INSTM, Department of Chemical Sciences, Padova University, 35131 Padova, Italy
| | - Chiara Maccato
- Department of Chemical Sciences, Padova University and INSTM, 35131 Padova, Italy
- CNR-ICMATE and INSTM, Department of Chemical Sciences, Padova University, 35131 Padova, Italy
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8
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Pu J, Tan Y, Wang T, Zhu X, Fan S. Ultrathin Two-Dimensional Fe-Co Bimetallic Oxide Nanosheets for Separator Modification of Lithium-Sulfur Batteries. Molecules 2022; 27. [PMID: 36431863 DOI: 10.3390/molecules27227762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 11/03/2022] [Accepted: 11/04/2022] [Indexed: 11/16/2022]
Abstract
The shuttle effect is understood to be the most significant issue that needs to be solved to improve the performance of lithium-sulfur batteries. In this study, ultrathin two-dimensional Fe-Co bimetallic oxide nanosheets were prepared using graphene as a template, which could rapidly catalyze the conversion of polysulfides and inhibit the shuttle effect. Additionally, such ultrathin nanostructures based on graphene provided sufficient active sites and fast diffusion pathways for lithium ions. Taking into account the aforementioned benefits, the ultrathin two-dimensional Fe-Co bimetallic oxide nanosheets modified separator assembled lithium-sulfur batteries delivered an incredible capacity of 1044.2 mAh g-1 at 1 C and retained an excellent reversible capacity of 859.4 mAh g-1 after 100 cycles. Even under high loading, it still achieved high area capacity and good cycle stability (92.6% capacity retention).
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9
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Kumar S, Ahmed F, Shaalan NM, Kumar R, Alshoaibi A, Arshi N, Dalela S, Sayeed F, Dwivedi S, Kumari K. Structural, Magnetic, and Electrical Properties of CoFe 2O 4 Nanostructures Synthesized Using Microwave-Assisted Hydrothermal Method. Materials (Basel) 2022; 15:7955. [PMID: 36431441 PMCID: PMC9698360 DOI: 10.3390/ma15227955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 11/02/2022] [Accepted: 11/08/2022] [Indexed: 06/16/2023]
Abstract
Magnetic nanostructures of CoFe2O4 were synthesized via a microwave-assisted hydrothermal route. The prepared nanostructures were investigated using X-ray diffraction (XRD), field emission electron microscopy (FE-SEM), energy dispersive X-ray (EDX) spectroscopy, high-resolution transmission electron microscopy (HR-TEM), selective area electron diffraction (SAED) pattern, DC magnetization, and dielectric spectroscopy measurements. The crystal structure studied using HR-TEM, SAED, and XRD patterns revealed that the synthesized nanostructures had a single-phase nature and ruled out the possibility of any secondary phase. The lattice parameters and unit cell volume determined from the XRD data were found to be 8.4821 Å and 583.88 Å3. The average crystallite size (~7.0 nm) was determined using Scherrer's equation. The FE-SEM and TEM micrographs revealed that the prepared nanostructures had a spherical shape morphology. The EDX results showed that the major elements present in the samples were Co, Fe, and O. The magnetization (M) versus temperature (T) measurements specified that the CoFe2O4 nanostructures showed ferromagnetic ordering at room temperature. The blocking temperature (TB) determined using the M-T curve was found to be 315 K. The magnetic hysteresis (M-H) loop of the CoFe2O4 nanostructures recorded at different temperatures showed the ferromagnetic behavior of the CoFe2O4 nanostructures at temperatures of 200 K and 300 K, and a superparamagnetic behavior at 350 K. The dielectric spectroscopy studies revealed a dielectric constant (ε') and loss tangent (tanδ) decrease with the increase in the frequency, as well as demonstrating a normal dispersion behavior, which is due to the Maxwell-Wagner type of interfacial polarization. The values of ε' and tanδ were observed to increase with the increase in the temperature.
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Affiliation(s)
- Shalendra Kumar
- Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia
- Department of Physics, University of Petroleum & Energy Studies, Dehradun 248007, Uttarakhand, India
| | - Faheem Ahmed
- Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia
| | - Nagih M. Shaalan
- Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia
- Physics Department, Faculty of Science, Assiut University, Assiut 71516, Egypt
| | - Rajesh Kumar
- University School of Basic and Applied Sciences, Guru Gobind Singh Indraprastha University, New Delhi 110078, India
| | - Adil Alshoaibi
- Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia
| | - Nishat Arshi
- Department of Basic Sciences, Preparatory Year Deanship, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia
| | - Saurabh Dalela
- Department of Pure & Applied Physics, University of Kota, Kota 324005, Rajasthan, India
| | - Fatima Sayeed
- Basic Science Department, Pre-Professional Program-Female, College of Science and Health Profession, King Saud bin Abdul Aziz University for Health Sciences, Al-Ahsa 31982, Saudi Arabia
| | - Sourabh Dwivedi
- Department of Applied Physics, Aligarh Muslim University, Aligarh 202001, Uttar Pradesh, India
| | - Kavita Kumari
- School of Materials Science and Engineering, Changwon National University, Changwon 51140, Gyeongnam, Korea
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10
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Velayutham L, Parvathiraja C, Anitha DC, Mahalakshmi K, Jenila M, Alasmary FA, Almalki AS, Iqbal A, Lai WC. Photocatalytic and Antibacterial Activity of CoFe 2O 4 Nanoparticles from Hibiscus rosa-sinensis Plant Extract. Nanomaterials (Basel) 2022; 12:3668. [PMID: 36296858 PMCID: PMC9609893 DOI: 10.3390/nano12203668] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 10/12/2022] [Accepted: 10/15/2022] [Indexed: 06/16/2023]
Abstract
Biogenic CoFe2O4 nanoparticles were prepared by co-precipitation and Hibiscus rosa sinensis plant leaf was used as a bio-reductant of the nanoparticle productions. The biosynthesized CoFe2O4 nanoparticles were characterized by XRD, FTIR, UV, VSM, and SEM via EDX analysis. The cubic phase of biosynthesized CoFe2O4 nanoparticles and their crystallite size was determined by XRD. The Co-Fe-O bonding and cation displacement was confirmed by FTIR spectroscopy. The presence of spherically-shaped biosynthesized CoFe2O4 nanoparticles and their material were confirmed by SEM and TEM via EDX. The super-paramagnetic behaviour of the biosynthesized CoFe2O4 nanoparticles and magnetic pulse was established by VSM analysis. Organic and bacterial pollutants were eradicated using the biosynthesized CoFe2O4 nanoparticles. The spinel ferrite biosynthesized CoFe2O4 nanoparticles generate radical and superoxide ions, which degrade toxic organic and bacterial pollutants in the environment.
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Affiliation(s)
- Lakshmi Velayutham
- Department of Physics, St. Xavier’s College (Autonomous), Manonmaniam Sundaranar University, Palayamkottai, Tirunelveli 627002, Tamilnadu, India
| | - C. Parvathiraja
- Department of Physics, Manonmaniam Sundaranar University, Tirunelveli 627012, Tamilnadu, India
| | - Dhivya Christo Anitha
- Department of Physics, St. Xavier’s College (Autonomous), Manonmaniam Sundaranar University, Palayamkottai, Tirunelveli 627002, Tamilnadu, India
| | - K. Mahalakshmi
- Department of Physics, St. Xavier’s College (Autonomous), Manonmaniam Sundaranar University, Palayamkottai, Tirunelveli 627002, Tamilnadu, India
| | - Mary Jenila
- Department of Physics, St. Xavier’s College (Autonomous), Manonmaniam Sundaranar University, Palayamkottai, Tirunelveli 627002, Tamilnadu, India
| | - Fatmah Ali Alasmary
- Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Amani Salem Almalki
- Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Amjad Iqbal
- Department of Advanced Materials & Technologies, Faculty of Materials Engineering, Silesian University of Technology, 44-100 Gliwice, Poland
| | - Wen-Cheng Lai
- Bachelor Program in Industrial Projects, National Yunlin University of Science and Technology, Douliu 640301, Taiwan
- Department of Electronic Engineering, National Yunlin University of Science and Technology, Douliu 640301, Taiwan
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11
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Soares JDO, Cavalcanti WEC, Torres MAM, Pergher SBC, De Oliveira FJVE, Braga TP. Synthesis, Characterization and Photocatalytic Activity of CoFe 2O 4/Fe 2O 3 Dispersed in Mesoporous KIT-6. Nanomaterials (Basel) 2022; 12:3566. [PMID: 36296757 PMCID: PMC9611405 DOI: 10.3390/nano12203566] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 10/03/2022] [Accepted: 10/06/2022] [Indexed: 06/16/2023]
Abstract
The present work aimed to synthesize and characterize a solid based on CoFe2O4/Fe2O3-KIT-6 and evaluate its performance in the photocatalytic degradation of the remazol red ultra RGB dye. By analyzing XRD, N2 physisorption, and Mössbauer results, it was possible to identify that the desired CoFe2O4/Fe2O3 phase was achieved, which maintained its structural properties. The FTIR-pyridine indicated the presence of Lewis acid sites, while TPD-CO2 showed a large amount of weak basic sites. The band-gap energy indicated that the compound can be applied in photocatalytic degradation under UV/visible light, with the possibility of magnetic separation at the end of the reaction. The photocatalysis results indicated that there was complete degradation of the remazol red ultra RGB dye within 1 h of reaction. Despite the absence of H2O2, the combination of the proposed photocatalyst with the anatase phase (TiO2) showed significant improvements in the degradation process. The proposed mechanism for complete dye degradation indicated that a sequence of radical reactions is necessary, generating oxidant species such as •OH and the final products were CO2 and H2O.
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Affiliation(s)
- Johnatan de Oliveira Soares
- Instituto de Química Laboratório de Peneiras Moleculares (LABPEMOL), Instituto de Química, Universidade Federal do Rio Grande do Norte, Natal 59078-970, RN, Brazil
| | - Wesley Eulálio Cabral Cavalcanti
- Instituto de Química Laboratório de Peneiras Moleculares (LABPEMOL), Instituto de Química, Universidade Federal do Rio Grande do Norte, Natal 59078-970, RN, Brazil
| | - Marco Antonio Morales Torres
- Departamento de Física Teórica e Experimental, Universidade Federal do Rio Grande do Norte, Natal 59078-970, RN, Brazil
| | - Sibele Berenice Castella Pergher
- Instituto de Química Laboratório de Peneiras Moleculares (LABPEMOL), Instituto de Química, Universidade Federal do Rio Grande do Norte, Natal 59078-970, RN, Brazil
| | - Fernando José Volpi Eusébio De Oliveira
- Instituto de Química Laboratório de Peneiras Moleculares (LABPEMOL), Instituto de Química, Universidade Federal do Rio Grande do Norte, Natal 59078-970, RN, Brazil
| | - Tiago Pinheiro Braga
- Instituto de Química Laboratório de Peneiras Moleculares (LABPEMOL), Instituto de Química, Universidade Federal do Rio Grande do Norte, Natal 59078-970, RN, Brazil
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Khairi MHA, Noor EEM, Ubaidillah U, Aziz SAA, Mazlan SA, Tarmizi SMA, Nordin NA. Enhancement of Magneto-Induced Modulus by the Combination of Filler and Plasticizer Additives-Based Magnetorheological Elastomer. Materials (Basel) 2022; 15:ma15186396. [PMID: 36143707 PMCID: PMC9501520 DOI: 10.3390/ma15186396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 08/01/2022] [Accepted: 08/11/2022] [Indexed: 05/17/2023]
Abstract
Filler additive is used to provide superior bonding in rubber matrix to enhance the storage modulus of magnetorheological elastomer (MRE). However, the magneto-induced modulus is reduced as the initial storage modulus increases. Therefore, this paper aims to increase the magneto-induced modulus and maintain the initial storage modulus by combining filler and plasticizer additives. Both types of additives have different functions, where cobalt ferrite (CoFe2O4) is capable of enhancing the maximum storage modulus and silicone oil (SO) reduces the initial storage modulus. Thus, four MRE samples have been fabricated using (a) no additive, (b) CoFe2O4, (c) SO, and (d) a combination of CoFe2O4 and SO. The sample's hardness and magnetic properties were investigated via Durometer Shore A and Vibrating Sample Magnetometer (VSM), respectively. Furthermore, the rheological properties of MRE samples in terms of storage modulus were investigated upon the frequency and magnetic field sweep using a rheometer. The results demonstrated that the storage modulus of the MRE samples has increased with increasing the oscillation frequency from 0.1 to 50 Hz. Interestingly, the combination of additives has produced the largest value of magneto-induced modulus of 0.90 MPa as compared to other samples. Furthermore, their initial storage modulus was in between samples with SO (lowest) and without additive (highest). Therefore, fundamental knowledge in adding the combination of additives can offer solutions for a wide range of stiffness in MR device applications such as vibration and noise control devices, sensing devices, and actuators.
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Affiliation(s)
- Muntaz Hana Ahmad Khairi
- Engineering Materials and Structures (eMast) iKohza, Malaysian-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia
| | - Ervina Efzan Mhd Noor
- Faculty of Engineering and Technology, Multimedia University, Jalan Ayer Keroh Lama, Bukit Beruang, Melaka 75450, Malaysia
- Correspondence: (E.E.M.N.); (U.U.); (S.A.M.)
| | - Ubaidillah Ubaidillah
- Mechanical Engineering Department, Faculty of Engineering, Universitas Sebelas Maret, Jl. Ir. Sutami 36A, Kentingan Jebres, Surakarta 57126, Indonesia
- Correspondence: (E.E.M.N.); (U.U.); (S.A.M.)
| | - Siti Aishah Abdul Aziz
- Faculty of Applied Sciences, Universiti Teknologi MARA Pahang, 26400 Bandar Tun Abdul Razak Jengka, Malaysia
| | - Saiful Amri Mazlan
- Engineering Materials and Structures (eMast) iKohza, Malaysian-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia
- Correspondence: (E.E.M.N.); (U.U.); (S.A.M.)
| | - Siti Maisarah Ahmad Tarmizi
- Engineering Materials and Structures (eMast) iKohza, Malaysian-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia
| | - Nur Azmah Nordin
- Engineering Materials and Structures (eMast) iKohza, Malaysian-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia
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Ansari SM, Sinha BB, Sen D, Sastry PU, Kolekar YD, Ramana CV. Effect of Oleylamine on the Surface Chemistry, Morphology, Electronic Structure, and Magnetic Properties of Cobalt Ferrite Nanoparticles. Nanomaterials (Basel) 2022; 12:3015. [PMID: 36080053 PMCID: PMC9458106 DOI: 10.3390/nano12173015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 08/12/2022] [Accepted: 08/23/2022] [Indexed: 06/15/2023]
Abstract
The influence of oleylamine (OLA) concentration on the crystallography, morphology, surface chemistry, chemical bonding, and magnetic properties of solvothermal synthesized CoFe2O4 (CFO) nanoparticles (NPs) has been thoroughly investigated. Varying OLA concentration (0.01-0.1 M) resulted in the formation of cubic spinel-structured CoFe2O4 NPs in the size-range of 20-14 (±1) nm. The Fourier transform spectroscopic analyses performed confirmed the OLA binding to the CFO NPs. The thermogravimetric measurements revealed monolayer and multilayer coating of OLA on CFO NPs, which were further supported by the small-angle X-ray scattering measurements. The magnetic measurements indicated that the maximum saturation (MS) and remanent (Mr) magnetization decreased with increasing OLA concentration. The ratio of maximum dipolar field (Hdip), coercivity (HC), and exchanged bias field (Hex) (at 10 K) to the average crystallite size (Dxrd), i.e., (Hdip/Dxrd), (HC/Dxrd), and (Hex/Dxrd), increased linearly with OLA concentration, indicating that OLA concurrently controls the particle size and interparticle interaction among the CFO NPs. The results and analyses demonstrate that the OLA-mediated synthesis allowed for modification of the structural and magnetic properties of CFO NPs, which could readily find potential application in electronics and biomedicine.
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Affiliation(s)
- Sumayya M. Ansari
- Department of Physics, Savitribai Phule Pune University, Pune 411 007, Maharashtra, India
| | - Bhavesh B. Sinha
- National Center for Nanoscience and Nanotechnology, University of Mumbai, Mumbai 400 032, Maharashtra, India
| | - Debasis Sen
- Bhabha Atomic Research Centre (BARC), Solid State Physics Division, Mumbai 400 085, Maharashtra, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, Maharashtra, India
| | - Pulya U. Sastry
- Bhabha Atomic Research Centre (BARC), Solid State Physics Division, Mumbai 400 085, Maharashtra, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, Maharashtra, India
| | - Yesh D. Kolekar
- Department of Physics, Savitribai Phule Pune University, Pune 411 007, Maharashtra, India
| | - C. V. Ramana
- Centre for Advanced Materials Research (CMR), University of Texas, El Paso, TX 79968, USA
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14
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Sachse E, Escobar-Castillo M, Waag F, Gökce B, Salamon S, Landers J, Wende H, Lupascu DC. Laser Ablation of NiFe 2O 4 and CoFe 2O 4 Nanoparticles. Nanomaterials (Basel) 2022; 12:1872. [PMID: 35683727 DOI: 10.3390/nano12111872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 05/24/2022] [Accepted: 05/26/2022] [Indexed: 01/27/2023]
Abstract
Pulsed laser ablation in liquids was utilized to prepare NiFe2O4 (NFO) and CoFe2O4 (CFO) nanoparticles from ceramic targets. The morphology, crystallinity, composition, and particle size distribution of the colloids were investigated. We were able to identify decomposition products formed during the laser ablation process in water. Attempts to fractionate the nanoparticles using the high-gradient magnetic separation method were performed. The nanoparticles with crystallite sizes in the range of 5–100 nm possess superparamagnetic behavior and approximately 20 Am2/kg magnetization at room temperature. Their ability to absorb light in the visible range makes them potential candidates for catalysis applications in chemical reactions and in biomedicine.
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Salles P, Guzmán R, Zanders D, Quintana A, Fina I, Sánchez F, Zhou W, Devi A, Coll M. Bendable Polycrystalline and Magnetic CoFe 2O 4 Membranes by Chemical Methods. ACS Appl Mater Interfaces 2022; 14:12845-12854. [PMID: 35232015 PMCID: PMC8931725 DOI: 10.1021/acsami.1c24450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 02/21/2022] [Indexed: 06/14/2023]
Abstract
The preparation and manipulation of crystalline yet bendable functional complex oxide membranes has been a long-standing issue for a myriad of applications, in particular, for flexible electronics. Here, we investigate the viability to prepare magnetic and crystalline CoFe2O4 (CFO) membranes by means of the Sr3Al2O6 (SAO) sacrificial layer approach using chemical deposition techniques. Meticulous chemical and structural study of the SAO surface and SAO/CFO interface properties have allowed us to identify the formation of an amorphous SAO capping layer and carbonates upon air exposure, which dictate the crystalline quality of the subsequent CFO film growth. Vacuum annealing at 800 °C of SAO films promotes the elimination of the surface carbonates and the reconstruction of the SAO surface crystallinity. Ex-situ atomic layer deposition of CFO films at 250 °C on air-exposed SAO offers the opportunity to avoid high-temperature growth while achieving polycrystalline CFO films that can be successfully transferred to a polymer support preserving the magnetic properties under bending. Float on and transfer provides an alternative route to prepare freestanding and wrinkle-free CFO membrane films. The advances and challenges presented in this work are expected to help increase the capabilities to grow different oxide compositions and heterostructures of freestanding films and their range of functional properties.
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Affiliation(s)
- Pol Salles
- ICMAB-CSIC, Campus UAB, Bellaterra, Barcelona 08193, Spain
| | - Roger Guzmán
- School
of Physical Sciences and CAS Key Laboratory of Vacuum Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - David Zanders
- Inorganic
Materials Chemistry, Ruhr University Bochum, Universitätsstrasse 150, Bochum 44801, Germany
| | | | - Ignasi Fina
- ICMAB-CSIC, Campus UAB, Bellaterra, Barcelona 08193, Spain
| | | | - Wu Zhou
- School
of Physical Sciences and CAS Key Laboratory of Vacuum Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Anjana Devi
- Inorganic
Materials Chemistry, Ruhr University Bochum, Universitätsstrasse 150, Bochum 44801, Germany
| | - Mariona Coll
- ICMAB-CSIC, Campus UAB, Bellaterra, Barcelona 08193, Spain
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KOÇAK G, BÜTÜN V. Production of NiMn2O4 hollow spheres and CoFe 2O 4 bowl-like structures by using block copolymer stabilized polystyrene spheres as a hard template. Turk J Chem 2021; 46:1-13. [PMID: 38143879 PMCID: PMC10734705 DOI: 10.3906/kim-2106-18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 02/23/2022] [Accepted: 09/16/2021] [Indexed: 12/26/2023] Open
Abstract
The aim of this study is to highlight the use of polystyrene (PS) latexes stabilized with block copolymers as a hard template in the production of metal oxide hollow spheres. PS latexes produced by dispersion polymerization by stabilizing with tertiary amine methacrylate-based diblock copolymer were used as a hard template in the preparation of nickel manganese oxide (NiMn2O4) hollow spheres and cobalt iron oxide (CoFe2O4) bowl-like structures. Thanks to the diblock copolymer stabilizer with tertiary amine functional groups on the PS surface, precursor salts of CoFe2O4 and NiMn2O4 were first homogeneously deposited on the surface of PS latexes with a controlled precipitation technique. Then, metal oxide hollow spheres and bowl-like structures were produced by calcination. XRD results showed that CoFe2O4 and NiMn2O4 structures were successfully obtained after calcination. The thermogravimetric analysis results showed that the CoFe2O4 and NiMn2O4 contents of the hybrid PS spheres were in the range of 26.0-28.6 wt%. SEM images showed that the inorganic-polymer spheres fused with each other after calcination to form larger magnetic CoFe2O4 bowl-like structures. SEM images also indicated successful production of highly rough NiMn2O4 hollow spheres with nanosheets on the surface.
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Affiliation(s)
- Gökhan KOÇAK
- Department of Chemistry and Chemical Process Technologies, Vocational School of Higher Education, Adıyaman University, Adıyaman,
Turkey
| | - Vural BÜTÜN
- Department of Chemistry, Faculty of Science and Letters, Eskişehir Osmangazi University, Eskişehir,
Turkey
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17
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Medina MA, Oza G, Ángeles-Pascual A, González M. M, Antaño-López R, Vera A, Leija L, Reguera E, Arriaga LG, Hernández Hernández JM, Ramírez JT. Synthesis, Characterization and Magnetic Hyperthermia of Monodispersed Cobalt Ferrite Nanoparticles for Cancer Therapeutics. Molecules 2020; 25:molecules25194428. [PMID: 32992439 PMCID: PMC7583941 DOI: 10.3390/molecules25194428] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 09/14/2020] [Accepted: 09/18/2020] [Indexed: 12/04/2022] Open
Abstract
Magnetic nanoparticles such as cobalt ferrite are investigated under clinical hyperthermia conditions for the treatment of cancer. Cobalt ferrite nanoparticles (CFNPs) synthesized by the thermal decomposition method, using nonionic surfactant Triton-X100, possess hydrophilic polyethylene oxide chains acting as reducing agents for the cobalt and iron precursors. The monodispersed nanoparticles were of 10 nm size, as confirmed by high-resolution transmission electron microscopy (HR-TEM). The X-ray diffraction patterns of CFNPs prove the existence of cubic spinel cobalt ferrites. Cs-corrected scanning transmission electron microscopy–high-angle annular dark-field imaging (STEM–HAADF) of CFNPs confirmed their multi-twinned crystallinity due to the presence of atomic columns and defects in the nanostructure. Magnetic measurements proved that the CFNPs possess reduced remnant magnetization (MR/MS) (0.86), which justifies cubic anisotropy in the system. Microwave-based hyperthermia studies performed at 2.45 GHz under clinical conditions in physiological saline increased the temperature of the CFNP samples due to the transformation of radiation energy to heat. The specific absorption rate of CFNPs in physiological saline was 68.28 W/g. Furthermore, when triple-negative breast cancer cells (TNBC) in the presence of increasing CFNP concentration (5 mg/mL to 40 mg/mL) were exposed to microwaves, the cell cytotoxicity was enhanced compared to CFNPs alone.
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Affiliation(s)
- Mauricio A. Medina
- Program on Nanoscience and Nanotechnology, CINVESTAV-IPN, Avenida IPN 2508, Gustavo A. Madero, San Pedro Zacatenco, Mexico City 07360, Mexico
- Correspondence: (M.A.M.); (G.O.); (J.T.R.)
| | - Goldie Oza
- Centro de Investigación y Desarrollo Tecnológico en Electroquímica (CIDETEQ), Parque Tecnológico Querétaro s/n, Sanfandila, Pedro Escobedo, Querétaro C.P. 76703, Mexico; (R.A.-L.); (L.G.A.)
- Correspondence: (M.A.M.); (G.O.); (J.T.R.)
| | - A. Ángeles-Pascual
- Laboratorio Avanzado de Nanoscopía Electrónica-LANE, Centro de Investigación y de Estudios CINVESTAV-IPN, Avenida IPN 2508, Gustavo A. Madero, San Pedro Zacatenco, México City 07360, Mexico;
| | - Marlene González M.
- CONACyT-Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y tecnología Avanzada, U. Legaria, Ciudad de México 11500, Mexico; (M.G.M.); (E.R.)
| | - R. Antaño-López
- Centro de Investigación y Desarrollo Tecnológico en Electroquímica (CIDETEQ), Parque Tecnológico Querétaro s/n, Sanfandila, Pedro Escobedo, Querétaro C.P. 76703, Mexico; (R.A.-L.); (L.G.A.)
| | - A. Vera
- Bioelectronics Section, Department of Electrical Engineering, CINVESTAV-IPN, Avenida IPN 2508, Gustavo A. Madero, San Pedro Zacatenco, México City 07360, Mexico; (A.V.); (L.L.)
| | - L. Leija
- Bioelectronics Section, Department of Electrical Engineering, CINVESTAV-IPN, Avenida IPN 2508, Gustavo A. Madero, San Pedro Zacatenco, México City 07360, Mexico; (A.V.); (L.L.)
| | - Edilso Reguera
- CONACyT-Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y tecnología Avanzada, U. Legaria, Ciudad de México 11500, Mexico; (M.G.M.); (E.R.)
| | - L. G. Arriaga
- Centro de Investigación y Desarrollo Tecnológico en Electroquímica (CIDETEQ), Parque Tecnológico Querétaro s/n, Sanfandila, Pedro Escobedo, Querétaro C.P. 76703, Mexico; (R.A.-L.); (L.G.A.)
| | | | - José Tapia Ramírez
- Department of Genetics and Molecular Biology, CINVESTAV-IPN, Avenida IPN 2508, Gustavo A. Madero, San Pedro Zacatenco, México City 07360, Mexico
- Correspondence: (M.A.M.); (G.O.); (J.T.R.)
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18
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Gökçe D, Köytepe S, Özcan İ. Assessing short-term effects of magnetite ferrite nanoparticles on Daphnia magna. Environ Sci Pollut Res Int 2020; 27:31489-31504. [PMID: 32488719 DOI: 10.1007/s11356-020-09406-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 05/21/2020] [Indexed: 06/11/2023]
Abstract
Magnetic nanoparticles (MNPs) are used in a wide range of sectors ranging from electronics to biomedicine, as well as in eutrophicated lake restoration due to their high P, N, and heavy metal adsorption capacity. This study assessed the effects of MNPs on mortality and morphometric changes of D. magna. According to the SEM, the synthesised MNPs were found to have spherical nanoparticles, be uniformly distributed, and have a homolithic size distribution of 50-110 nm. The EDX spectra confirmed the elemental structure and purities of these MNPs. A total of 396 neonates were used for short-term bioassays (96 h) through the MNPs in the laboratory (16:8 photoperiod). Experiments were applied in triplicate for each concentration of CuFe2O4, CoFe2O4, and NiFe2O4 MNPs and their respective control groups. Mortality and morphological measurements of each individual were recorded every 24 h. In the probit analysis, the 96-h LC50 (p < 0.05) for CuFe2O4, CoFe2O4, and NiFe2O4 MNPs was calculated to be 1.455 mg L-1, 39.834 mg L-1, and 21.730 mg L-1, respectively. CuFe2O4 MNPs were found to be more toxic than the other two MNPs. The concentrations of CuFe2O4, CoFe2O4, and NiFe2O4 MNPs drastically affected life span and morphologic growth of D. magna as a result of a short time exposure. The results of this study are useful for assessing what risks they pose to freshwater ecosystems.
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Affiliation(s)
- Didem Gökçe
- Department of Biology, Faculty of Arts and Science, İnönü University, Malatya, Turkey.
| | - Süleyman Köytepe
- Department of Chemistry, Faculty of Arts and Science, İnönü University, Malatya, Turkey
| | - İmren Özcan
- Department of Chemistry, Faculty of Arts and Science, İnönü University, Malatya, Turkey
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19
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Liu S, Ge H, Cheng S, Zou Y. Green synthesis of magnetic 3D bio-adsorbent by corn straw core and chitosan for methylene blue removal. Environ Technol 2020; 41:2109-2121. [PMID: 30526396 DOI: 10.1080/09593330.2018.1556345] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Accepted: 11/30/2018] [Indexed: 06/09/2023]
Abstract
In this work, a novel bio-adsorbent with a unique structure was prepared through one-step crosslinking in the emulsion using corn straw core (CSC), CoFe2O4 and chitosan (CS) as raw materials for adsorption of methylene blue (MB). The preparation method of the adsorbent was simple and environmentally friendly. In the adsorbent, the agricultural waste of CSC acted as scaffold and was wrapped with CS. CoFe2O4 was embedded in CS, giving magnetic property to the adsorbent, which was beneficial to the separation process. XRD, FTIR, SEM and TEM were utilized to characterize the adsorbent and the factors affecting adsorption removal efficiency were explored. The pseudo-second-order model and the Langmuir model described the adsorption behaviour well. The equilibrium adsorption capacity was 122 mg g-1 for MB at 298 K. The thermodynamic studies suggested that the adsorption was a spontaneous, exothermic and randomness decrease process. MB loaded on the adsorbent could be desorbed by immersing in dilute acid solution, indicating that this kind of biomass adsorbent can be widely used in the field of adsorption.
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Affiliation(s)
- Shanshan Liu
- School of Materials Science and Engineering, University of Jinan, Jinan, People's Republic of China
| | - Heyi Ge
- School of Materials Science and Engineering, University of Jinan, Jinan, People's Republic of China
| | - Shilin Cheng
- Library, University of Jinan, Jinan, People's Republic of China
| | - Yu Zou
- School of Materials Science and Engineering, University of Jinan, Jinan, People's Republic of China
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Najafi K, Asadpour-Zeynali K, Mollarasouli F. Preparation of A Magnetic Nanosensor Based on Cobalt Ferrite Nanoparticles for The Electrochemical Determination of Methyldopa in The Presence of Uric Acid. Comb Chem High Throughput Screen 2020; 23:1023-1031. [PMID: 32436826 DOI: 10.2174/1386207323666200521123657] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Revised: 01/02/2020] [Accepted: 03/17/2020] [Indexed: 11/22/2022]
Abstract
AIM AND OBJECTIVE Methyldopa is one of the medications that is used for the treatment of hypertension. Therefore, the determination of methyldopa in the presence of other biological components is essential. In this work, a promising electrochemical sensor based on CoFe2O4 magnetic nanoparticles modified glassy carbon electrode (CoFe2O4/GCE) was developed for electrochemical determination of methyldopa in the presence of uric acid. Cobalt ferrite nanoparticles were synthesized via chemical method. MATERIALS AND METHODS Characterizing the CoFe2O4 was investigated by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), transmission electron microscope (TEM), and cyclic voltammetry techniques. RESULTS Under the optimal experimental conditions, the current response of the electrochemical sensor obtained with differential pulse voltammetry was increased linearly in the concentration range from 1.45 to 15.1 μmol L-1 with the detection limit of 1.07 μmol L-1 for methyldopa. Also, by using the proposed method, methyldopa and uric acid could be analyzed in a mixture independently. The difference in peak potential for analytes is about 150 mV. CONCLUSION The present sensor was successfully applied for the determination of methyldopa in the presence of uric acid in biological samples and the pharmaceutical samples with satisfactory results.
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Affiliation(s)
- Khadijeh Najafi
- Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz 51666-16471, Iran
| | - Karim Asadpour-Zeynali
- Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz 51666-16471, Iran
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Labchir N, Amaterz E, Hannour A, Ait Hssi A, Vincent D, Ihlal A, Sajieddine M. Highly efficient nanostructured CoFe 2 O 4 thin film electrodes for electrochemical degradation of rhodamine B. Water Environ Res 2020; 92:759-765. [PMID: 31701586 DOI: 10.1002/wer.1272] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 10/21/2019] [Accepted: 10/28/2019] [Indexed: 06/10/2023]
Abstract
In this work, we report the application of highly efficient electrodeposited cobalt ferrite (CoFe2 O4 ) thin films in electrochemical degradation of rhodamine B. XRD, FTIR and Raman spectroscopic studies confirmed the formation of single phase CoFe2 O4 . SEM analysis revealed a very fine nanorods dispersed uniformly with average size around 30 nm. UV-Vis spectrophotometry emphasized that the optical band gap value is 1.6 eV. Moreover, the elaborated CoFe2 O4 thin films showed a good efficiency for the electrochemical degradation of an aqueous solution of rhodamine B (RhB) attaining 99% during the first 3 min of reaction time. The trapping experiments revealed that the hydroxyl radicals were the main active species leading to the removal of RhB initial concentration of 10 mg/L in a very short time. PRACTITIONER POINTS: A simple electrodeposition technique was used to fabricate CoFe2 O4 thin. XRD and FTIR studies revealed the formation of pure cubic spinel phase. Nano-rod like morphology has been successfully synthesized. The rhodamine B aqueous solution has been completely decolorized using the obtained CoFe2 O4 thin films.
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Affiliation(s)
- Nabil Labchir
- UJM-Saint-Etienne, CNRS, LabHC UMR 5516, Univ Lyon, Saint-Etienne, France
- Faculty of Sciences, Materials and Renewable Energies Laboratory, Agadir, Morocco
| | - Elhassan Amaterz
- Materials and Environment (LME) Laboratory, Faculty of Sciences, University Ibn Zohr, Agadir, Morocco
| | - Abdelkrim Hannour
- Faculty of Sciences, Materials and Renewable Energies Laboratory, Agadir, Morocco
| | - Abderrahim Ait Hssi
- Faculty of Sciences, Materials and Renewable Energies Laboratory, Agadir, Morocco
| | - Didier Vincent
- UJM-Saint-Etienne, CNRS, LabHC UMR 5516, Univ Lyon, Saint-Etienne, France
| | - Ahmed Ihlal
- Faculty of Sciences, Materials and Renewable Energies Laboratory, Agadir, Morocco
| | - Mohammed Sajieddine
- Materials Physics Laboratory, FST, University of Sultan Moulay Slimane, Béni Mellal, Morocco
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22
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Ou G, Wu F, Huang K, Hussain N, Zu D, Wei H, Ge B, Yao H, Liu L, Li H, Shi Y, Wu H. Boosting the Electrocatalytic Water Oxidation Performance of CoFe 2O 4 Nanoparticles by Surface Defect Engineering. ACS Appl Mater Interfaces 2019; 11:3978-3983. [PMID: 30624038 DOI: 10.1021/acsami.8b19265] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Spinel oxides have attracted widespread interest for electrocatalytic applications owing to their unique crystal structure and properties. The surface structure of spinel oxides significantly influences the electrocatalytic performance of spinel oxides. Herein, we report a Li reduction strategy that can quickly tune the surface structure of CoFe2O4 (CFO) nanoparticles and optimize its electrocatalytic oxygen evolution reaction (OER) performance. Results show that a large number of defective domains have been successfully introduced at the surface of CFO nanopowders after Li reduction treatment. The defective CFO nanoparticles demonstrate significantly improved electrocatalytic OER activity. The OER potential observed a negative shift from 1.605 to 1.513 V at 10 mA cm-2, whereas the Tafel slope is greatly decreased to 42.1 mV dec-1 after 4 wt % Li reduction treatment. This efficient Li reduction strategy can also be applied to engineer the surface defect structure of other material systems and broaden their applications.
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Affiliation(s)
- Gang Ou
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
| | | | - Kai Huang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
| | - Naveed Hussain
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
| | - Di Zu
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
| | - Hehe Wei
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
| | - Binghui Ge
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , China
- Institute of Physical Science and Information Technology , Anhui University , Hefei 230601 , Anhui , China
| | | | | | | | | | - Hui Wu
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China
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23
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Zhang J, Khan MA, Xia M, Abdo AM, Lei W, Liao C, Wang F. Facile hydrothermal synthesis of magnetic adsorbent CoFe 2O 4/MMT to eliminate antibiotics in aqueous phase: tetracycline and ciprofloxacin. Environ Sci Pollut Res Int 2019; 26:215-226. [PMID: 30387065 DOI: 10.1007/s11356-018-3452-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Accepted: 10/11/2018] [Indexed: 06/08/2023]
Abstract
A highly resourceful, eco-friendly, and recyclable magnetic adsorbent based on montmorillonite (CoFe2O4/MMT) was fabricated via a facile hydrothermal method to harvest tetracycline (TC) and ciprofloxacin (CIP) from pollutant water. The prepared adsorbent was characterized by XRD, FT-IR, SEM, and VSM methods to comprehend its structure, morphology, and magnetism. Effects of experimental parameters including solution pH, adsorption time, initial concentration, and ion strength were studied in details. The experimental adsorption data of TC and CIP fitted into pseudo-second-order kinetic model and Langmuir isotherm, respectively. The maximum adsorptions of TC and CIP could reach up to 240.91 and 224.00 mg/g. The thermodynamic study indicates that the adsorption process is spontaneous. In addition, the antibiotics can be further degraded under visible light environment and the magnetic sorbent can also be thermally regenerated. Graphical abstract ᅟ.
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Affiliation(s)
- Juan Zhang
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China
| | - Muhammad Asim Khan
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China
| | - Mingzhu Xia
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China.
| | - Abdelnasir Mahmoud Abdo
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China
| | - Wu Lei
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China
| | - Chuan Liao
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China
| | - Fengyun Wang
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China.
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24
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Wang C, Su H, Ma Y, Yang D, Dong Y, Li D, Wang L, Liu Y, Zhang J. Coordination Polymers-Derived Three-Dimensional Hierarchical CoFe 2O 4 Hollow Spheres as High-Performance Lithium Ion Storage. ACS Appl Mater Interfaces 2018; 10:28679-28685. [PMID: 30085642 DOI: 10.1021/acsami.8b09459] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Hierarchical CoFe2O4 (CFO) hollow spheres were successfully synthesized via solvothermal method and calcination treatment. The obtained CFO completely inherited the hollow structure and spherical morphology of its precursor of cobalt-based ferrocenyl coordination polymers (Co-Fc-CPs). The three-dimensional (3D) porous hierarchical hollow structure can not only promote the permeation of electrolyte and shorten the lithium-ion transfer distance but also provide a cushion for the volume change during insertion/extraction of lithium ions. To improve the electrochemical properties, the CFO was combined with two forms of carbonaceous materials to controllably obtain 3D CoFe2O4@C (CFO@C) and CoFe2O4@reduced graphene oxide (CFO@rGO) composites. Compared with bare CFO and CFO@C, CFO@rGO exhibited a superior electrochemical performance, achieving a high specific capacity of 933.1 mA h g-1 at a current density of 100 mA g-1 after 100 cycles and showing an outstanding cycling life with a capacity of 615.6 mA h g-1 at 1000 mA g-1 after 600 cycles. In situ X-ray diffraction technique was applied to investigate the lithium storage mechanism during discharge/charge processes. This work provides a new approach to prepare hierarchical hollow bimetallic oxides composites for lithium-ion anode materials.
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Affiliation(s)
- Canpei Wang
- College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , People's Republic of China
| | - Hang Su
- College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , People's Republic of China
| | - Yuhang Ma
- College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , People's Republic of China
| | - Dingcheng Yang
- College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , People's Republic of China
| | - Yutao Dong
- College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , People's Republic of China
| | - Dan Li
- College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , People's Republic of China
| | - Lizhen Wang
- Department of Material and Chemical Engineering , Zhengzhou University of Light Industry , Zhengzhou 45001 , People's Republic of China
| | - Yushan Liu
- College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , People's Republic of China
| | - Jianmin Zhang
- College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , People's Republic of China
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25
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Kawamura G, Ohara K, Tan WK, Goto T, Nakamura Y, Inoue M, Muto H, Yamaguchi K, Boccaccini AR, Matsuda A. Multiferroic nanocomposite fabrication via liquid phase using anodic alumina template. Sci Technol Adv Mater 2018; 19:535-542. [PMID: 30083278 PMCID: PMC6063339 DOI: 10.1080/14686996.2018.1493888] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 06/24/2018] [Accepted: 06/25/2018] [Indexed: 06/08/2023]
Abstract
We report a novel and inexpensive fabrication process of multiferroic nanocomposite via liquid phase using an anodic alumina template. The sol-gel spin-coating technique was used to coat the template with ferrimagnetic CoFe2O4. By dissolving the template with NaOH aqueous solution, a unique nanotube array structure of CoFe2O4 was obtained. The CoFe2O4 nanotube arrays were filled with, and sandwiched in, ferroelectric BaTiO3 layers by a sol-gel spin-coating method to obtain the composite. Its multiferroicity was confirmed by measuring the magnetic and dielectric hysteresis loops.
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Affiliation(s)
- Go Kawamura
- Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Japan
- Institute of Biomaterials, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Kazuhiro Ohara
- Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Japan
| | - Wai Kian Tan
- Institute of Liberal Arts and Science, Toyohashi University of Technology, Toyohashi, Aichi, Japan
| | - Taichi Goto
- Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Japan
- JST, PRESTO, Kawaguchi, Saitama, Japan
| | - Yuichi Nakamura
- Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Japan
| | - Mitsuteru Inoue
- Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Japan
| | - Hiroyuki Muto
- Institute of Liberal Arts and Science, Toyohashi University of Technology, Toyohashi, Aichi, Japan
| | - Kazuhiro Yamaguchi
- Electrical and Electronic Engineering Course, National Institute of Technology, Ibaraki College, Hitachinaka, Japan
| | - Aldo R. Boccaccini
- Institute of Biomaterials, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Atsunori Matsuda
- Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Japan
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26
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Xu X, Chen H, Cao Y, Lin Y, Liu J. A Novel Fluorescent Nanoparticle for Sensitive Detection of Cry1Ab Protein In Vitro and In Vivo. J Fluoresc 2018; 28:863-869. [PMID: 29992458 DOI: 10.1007/s10895-018-2248-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 06/07/2018] [Indexed: 12/14/2022]
Abstract
Here, we report the synthesis and characterization of CoFe2O4 doping Ag2S dendrimer-modified nanoparticles (CoFe2O4-Ag2S DMNs) in Cry1Ab protein detection and imaging. The near-infrared Ag2S quantum dots were first prepared by using the thermal decomposition method, followed by modification of the water-soluble quantum dots using the method of solvent evaporation and ligand exchange, and finally the fluorescent magnetic bifunctional nanoparticles were obtained by binding with CoFe2O4. As-prepared CoFe2O4-Ag2S DMNs were characterized by fluorescence (FL) spectroscopy and transmission electron microscopy (TEM). Results showed that Ag2S DMNs could sensitively detect Cry1Ab both in vitro and in vivo. In vitro, the enhanced FL intensity as a function of the concentration is notably consistent with the Langmuir binding isotherm equation in the range of 0-200 ng/mL of Cry1Ab proteins. The detection limit of this method was found to be 0.2 ng/mL. Meanwhile, the fluorescence wavelength was extended to the second near-infrared range (NIR-II, 1.0~1.4 μm), which enables in vivo imaging. This study highlights the importance of NIR QDs doping magnetic materials as a new method to trace Bacillus thuringiensis (Bt) in insects and their potential applications in in vivo NIR tissue imaging.
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Affiliation(s)
- Xiao Xu
- College of Science, Huazhong Agricultural University, Wuhan, China
| | - Hao Chen
- College of Science, Huazhong Agricultural University, Wuhan, China
| | - Yuancheng Cao
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Jianghan University, Wuhan, China
| | - Yongjun Lin
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, China
| | - Jun'an Liu
- College of Science, Huazhong Agricultural University, Wuhan, China.
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27
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Wu L, Wan G, Hu N, He Z, Shi S, Suo Y, Wang K, Xu X, Tang Y, Wang G. Synthesis of Porous CoFe₂O₄ and Its Application as a Peroxidase Mimetic for Colorimetric Detection of H₂O₂ and Organic Pollutant Degradation. Nanomaterials (Basel) 2018; 8:nano8070451. [PMID: 29933545 PMCID: PMC6071025 DOI: 10.3390/nano8070451] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 06/02/2018] [Accepted: 06/14/2018] [Indexed: 02/04/2023]
Abstract
Porous CoFe₂O₄ was prepared via a simple and controllable method to develop a low-cost, high-efficiency, and good-stability nanozyme. The morphology and microstructure of the obtained CoFe₂O₄ was investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), specific surface area and pore analysis, and Raman spectroscopy. The results show that the annealing temperature has an important effect on the crystallinity, grain size, and specific surface area of CoFe₂O₄. CoFe₂O₄ obtained at 300 °C (CF300) exhibits the largest surface area (up to 204.1 m² g−1) and the smallest grain size. The peroxidase-like activity of CoFe₂O₄ was further verified based on the oxidation of peroxidase substrate 3,3’,5,5’-tetramethylbenzidine (TMB) in the presence of H₂O₂. The best peroxidase-like activity for CF300 should be ascribed to its largest surface area and smallest grain size. On this basis, an effective method of colorimetric detection H₂O₂ was established. In addition, the porous CoFe₂O₄ was also used for the catalytic oxidation of methylene blue (MB), indicating potential applications in pollutant removal and water treatment.
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Affiliation(s)
- Lihong Wu
- Key Laboratory of Advanced Materials of Tropical Island Resources (Hainan University), Ministry of Education, Haikou 570228, China.
| | - Gengping Wan
- Key Laboratory of Advanced Materials of Tropical Island Resources (Hainan University), Ministry of Education, Haikou 570228, China.
| | - Na Hu
- Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China.
| | - Zhengyi He
- Key Laboratory of Advanced Materials of Tropical Island Resources (Hainan University), Ministry of Education, Haikou 570228, China.
| | - Shaohua Shi
- Key Laboratory of Advanced Materials of Tropical Island Resources (Hainan University), Ministry of Education, Haikou 570228, China.
| | - Yourui Suo
- Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China.
| | - Kan Wang
- Key Laboratory of Advanced Materials of Tropical Island Resources (Hainan University), Ministry of Education, Haikou 570228, China.
| | - Xuefei Xu
- Key Laboratory of Advanced Materials of Tropical Island Resources (Hainan University), Ministry of Education, Haikou 570228, China.
| | - Yulin Tang
- Key Laboratory of Advanced Materials of Tropical Island Resources (Hainan University), Ministry of Education, Haikou 570228, China.
| | - Guizhen Wang
- Key Laboratory of Advanced Materials of Tropical Island Resources (Hainan University), Ministry of Education, Haikou 570228, China.
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28
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Lima DR, Jiang N, Liu X, Wang J, Vulcani VAS, Martins A, Machado DS, Landers R, Camargo PHC, Pancotti A. Employing Calcination as a Facile Strategy to Reduce the Cytotoxicity in CoFe 2O 4 and NiFe 2O 4 Nanoparticles. ACS Appl Mater Interfaces 2017; 9:39830-39838. [PMID: 29058402 DOI: 10.1021/acsami.7b13103] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
CoFe2O4 and NiFe2O4 nanoparticles (NPs) represent promising candidates for biomedical applications. However, in these systems, the knowledge over how various physical and chemical parameters influence their cytotoxicity remains limited. In this article, we investigated the effect of different calcination temperatures over cytotoxicity of CoFe2O4 and NiFe2O4 NPs, which were synthesized by a sol-gel proteic approach, toward L929 mouse fibroblastic cells. More specifically, we evaluated and compared CoFe2O4 and NiFe2O4 NPs presenting low crystallinity (that were calcined at 400 and 250 °C, respectively) with their highly crystalline counterparts (that were calcined at 800 °C). We found that the increase in the calcination temperature led to the reduction in the concentration of surface defect sites and/or more Co or Ni atoms located at preferential crystalline sites in both cases. A reduction in the cytotoxicity toward mouse fibroblast L929 cells was observed after calcination at 800 °C. Combining with inductively coupled plasma mass spectrometry data, our results indicate that the calcination temperature can be employed as a facile strategy to reduce the cytotoxicity of CoFe2O4 and NiFe2O4, in which higher temperatures contributed to the decrease in the dissolution of Co2+ or Ni2+ from the NPs. We believe these results may shed new insights into the various parameters that influence cytotoxicity in ferrite NPs, which may pave the way for their widespread applications in biomedicine.
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Affiliation(s)
- Débora R Lima
- Regional Jataí, Unidade Acadêmica Especial de Ciências Exatas and Unidade Acadêmica Especial de Ciências da Saúde, Universidade Federal de Goiás , Rod. Br 364, km 168, 76600-000 Jataí, GO, Brazil
| | - Ning Jiang
- Department of Oral and Craniomaxillofacial Science, Ninth People's Hospital, College of Stomatology, Shanghai Key Laboratory of Stomatology, Shanghai Jiao Tong University School of Medicine , Shanghai 200011, China
| | - Xin Liu
- Shanghai Biomaterials Research & Testing Center, Ninth People's Hospital, Shanghai Key Laboratory of Stomatology, Shanghai Jiaotong University School of Medicine , No. 427, Ju Men Road, Shanghai 200023, China
| | - Jiale Wang
- College of Science, Donghua University , Shanghai 201620, China
| | - Valcinir A S Vulcani
- Regional Jataí, Unidade Acadêmica Especial de Ciências Exatas and Unidade Acadêmica Especial de Ciências da Saúde, Universidade Federal de Goiás , Rod. Br 364, km 168, 76600-000 Jataí, GO, Brazil
| | - Alessandro Martins
- Regional Jataí, Unidade Acadêmica Especial de Ciências Exatas and Unidade Acadêmica Especial de Ciências da Saúde, Universidade Federal de Goiás , Rod. Br 364, km 168, 76600-000 Jataí, GO, Brazil
| | - Douglas S Machado
- Regional Jataí, Unidade Acadêmica Especial de Ciências Exatas and Unidade Acadêmica Especial de Ciências da Saúde, Universidade Federal de Goiás , Rod. Br 364, km 168, 76600-000 Jataí, GO, Brazil
| | - Richard Landers
- Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas , 13083-859 Campinas, SP, Brazil
| | - Pedro H C Camargo
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Lineu Prestes, 748, 05508-000 São Paulo, SP, Brazil
| | - Alexandre Pancotti
- Regional Jataí, Unidade Acadêmica Especial de Ciências Exatas and Unidade Acadêmica Especial de Ciências da Saúde, Universidade Federal de Goiás , Rod. Br 364, km 168, 76600-000 Jataí, GO, Brazil
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29
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He Q, Rui K, Chen C, Yang J, Wen Z. Interconnected CoFe 2O 4-Polypyrrole Nanotubes as Anode Materials for High Performance Sodium Ion Batteries. ACS Appl Mater Interfaces 2017; 9:36927-36935. [PMID: 28960062 DOI: 10.1021/acsami.7b12503] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
CoFe2O4-coated polypyrrole (PPy) nanotubes (CFO-PPy-NTs) with three-dimensional (3-D) interconnected networks have been prepared through a simple hydrothermal method. The application has been also studied for sodium ion batteries (SIBs). The finely crystallized CoFe2O4 nanoparticles (around 5 nm in size) are uniformly grown on the PPy nanotubes. When tested as anode materials for SIBs, the CFO-PPy-NT electrode maintains a discharge capacity of 400 mA h g-1 and a stable Coulombic efficiency of 98% after 200 cycles at 100 mA g-1. Even at a higher current density of 1000 mA g-1, the composite can still retain a discharge capacity of 220 mA h g-1 after 2000 cycles. The superior electrochemical performance could be mainly ascribed to the uniform distribution of CoFe2O4 on the 3-D matrix of PPy interconnected nanotubes, which favors the diffusion of sodium ions and electronic transportation and also buffers the large volumetric expansion during charge/discharge. Thereby our study suggests that such CFO-PPy-NTs have great potential as an anode material for SIBs.
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Affiliation(s)
- Qiming He
- CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P. R. China
- University of Chinese Academy of Sciences , Beijing 100049, P. R. China
| | - Kun Rui
- CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P. R. China
| | - Chunhua Chen
- CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China , Hefei, Anhui 230026, P. R. China
| | - Jianhua Yang
- CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P. R. China
- University of Chinese Academy of Sciences , Beijing 100049, P. R. China
| | - Zhaoyin Wen
- CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P. R. China
- University of Chinese Academy of Sciences , Beijing 100049, P. R. China
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30
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Pham CD, Chang J, Zurbuchen MA, Chang JP. Magnetic Properties of CoFe 2O 4 Thin Films Synthesized by Radical-Enhanced Atomic Layer Deposition. ACS Appl Mater Interfaces 2017; 9:36980-36988. [PMID: 28925262 DOI: 10.1021/acsami.7b08097] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A radical-enhanced atomic layer deposition (RE-ALD) process was developed for growing ferrimagnetic CoFe2O4 thin films. By utilizing bis(2,2,6,6-tetramethyl-3,5-heptanedionato) cobalt(II), tris(2,2,6,6-tetramethyl-3,5-heptanedionato) iron(III), and atomic oxygen as the metal and oxidation sources, respectively, amorphous and stoichiometric CoFe2O4 films were deposited onto SrTiO3 (001) substrates at 200 °C. The RE-ALD growth rate obtained for CoFe2O4 is ∼2.4 Å/supercycle, significantly higher than the values reported for thermally activated ALD processes. Microstructural characterization by X-ray diffraction and transmission electron microscopy indicate that the CoFe2O4 films annealed between 450 and 750 °C were textured polycrystalline with an epitaxial interfacial layer, which allows strain-mediated tuning of the magnetic properties given its highly magnetostrictive nature. The magnetic behavior was studied as a function of film thickness and annealing temperature: saturation magnetization (Ms) ranged from 260 to 550 emu/cm3 and magnetic coercivity (Hc) ranged from 0.2 to 2.2 kOe. Enhanced magnetic anisotropy was achieved in the thinner samples, whereas the overall magnetic strength improved after annealing at higher temperatures. The RE-ALD CoFe2O4 thin films exhibit magnetic properties that are comparable to both bulk crystal and films grown by other deposition methods, with thickness as low as ∼7 nm, demonstrating the potential of RE-ALD for the synthesis of high-quality magnetic oxides with large-scale processing compatibility.
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Affiliation(s)
- Calvin D Pham
- Department of Chemical and Biomolecular Engineering and ‡Department of Electrical Engineering, University of California, Los Angeles (UCLA) , Los Angeles, California 90095, United States
| | - Jeffrey Chang
- Department of Chemical and Biomolecular Engineering and ‡Department of Electrical Engineering, University of California, Los Angeles (UCLA) , Los Angeles, California 90095, United States
| | - Mark A Zurbuchen
- Department of Chemical and Biomolecular Engineering and ‡Department of Electrical Engineering, University of California, Los Angeles (UCLA) , Los Angeles, California 90095, United States
| | - Jane P Chang
- Department of Chemical and Biomolecular Engineering and ‡Department of Electrical Engineering, University of California, Los Angeles (UCLA) , Los Angeles, California 90095, United States
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31
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Zhang Y, Shen L, Liu M, Li X, Lu X, Lu L, Ma C, You C, Chen A, Huang C, Chen L, Alexe M, Jia CL. Flexible Quasi-Two-Dimensional CoFe 2O 4 Epitaxial Thin Films for Continuous Strain Tuning of Magnetic Properties. ACS Nano 2017; 11:8002-8009. [PMID: 28657728 DOI: 10.1021/acsnano.7b02637] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Epitaxial thin films of CoFe2O4 (CFO) have successfully been transferred from a SrTiO3 substrate onto a flexible polyimide substrate. By bending the flexible polyimide, different levels of uniaxial strain are continuously introduced into the CFO epitaxial thin films. Unlike traditional epitaxial strain induced by substrates, the strain from bending will not suffer from critical thickness limitation, crystalline quality variation, and substrate clamping, and more importantly, it provides a more intrinsic and reliable way to study strain-controlled behaviors in functional oxide systems. It is found that both the saturation magnetization and coercivity of the transferred films can be changed over the bending status and show a high accord with the movement of the curvature bending radius of the polyimide substrate. This reveals that the mechanical strain plays a critical role in tuning the magnetic properties of CFO thin films parallel and perpendicular to the film plane direction.
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Affiliation(s)
| | | | | | - Xin Li
- State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, School of Microelectronics, Xidian University , Xi'an 710071, China
| | - Xiaoli Lu
- State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, School of Microelectronics, Xidian University , Xi'an 710071, China
| | | | | | - Caiyin You
- School of Materials Science and Engineering, Xi'an University of Technology , Xi'an 710048, China
| | - Aiping Chen
- Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Chuanwei Huang
- Shenzhen Key Laboratory of Special Functional Materials, College of Materials Science and Engineering, Shenzhen University , Nanshan District, Shenzhen 518060, China
| | - Lang Chen
- Department of Physics, South University of Science and Technology , Nanshan District, Shenzhen 518055, China
| | - Marin Alexe
- Department of Physics, University of Warwick , Coventry CV4 7AL, United Kingdom
| | - Chun-Lin Jia
- Ernst Ruska Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich , D-52425 Jülich, Germany
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Jie W, Yang Z, Zhang F, Bai G, Leung CW, Hao J. Observation of Room-Temperature Magnetoresistance in Monolayer MoS 2 by Ferromagnetic Gating. ACS Nano 2017; 11:6950-6958. [PMID: 28686411 DOI: 10.1021/acsnano.7b02253] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Room-temperature magnetoresistance (MR) effect is observed in heterostructures of wafer-scale MoS2 layers and ferromagnetic dielectric CoFe2O4 (CFO) thin films. Through the ferromagnetic gating, an MR ratio of -12.7% is experimentally achieved in monolayer MoS2 under 90 kOe magnetic field at room temperature (RT). The observed MR ratio is much higher than that in previously reported nonmagnetic metal coupled with ferromagnetic insulator, which generally exhibited MR ratio of less than 1%. The enhanced MR is attributed to the spin accumulation at the heterostructure interface and spin injection to the MoS2 layers by the strong spin-orbit coupling effect. The injected spin can contribute to the spin current and give rise to the MR by changing the resistance of MoS2 layers. Furthermore, the MR effect decreases as the thickness of MoS2 increases, and the MR ratio becomes negligible in MoS2 with thickness more than 10 layers. Besides, it is interesting to find a magnetic field direction dependent spin Hall magnetoresistance that stems from a combination of the spin Hall and the inverse spin Hall effects. Our research provides an insight into exploring RT MR in monolayer materials, which should be helpful for developing ultrathin magnetic storage devices in the atomically thin limit.
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Affiliation(s)
- Wenjing Jie
- Department of Applied Physics, The Hong Kong Polytechnic University , Hung Hom, Kowloon, Hong Kong, China
- College of Chemistry and Materials Science, Sichuan Normal University , Chengdu 610068, China
| | - Zhibin Yang
- Department of Applied Physics, The Hong Kong Polytechnic University , Hung Hom, Kowloon, Hong Kong, China
| | - Fan Zhang
- Department of Applied Physics, The Hong Kong Polytechnic University , Hung Hom, Kowloon, Hong Kong, China
| | - Gongxun Bai
- Department of Applied Physics, The Hong Kong Polytechnic University , Hung Hom, Kowloon, Hong Kong, China
| | - Chi Wah Leung
- Department of Applied Physics, The Hong Kong Polytechnic University , Hung Hom, Kowloon, Hong Kong, China
| | - Jianhua Hao
- Department of Applied Physics, The Hong Kong Polytechnic University , Hung Hom, Kowloon, Hong Kong, China
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Deng L, Shi Z, Zou Z, Zhou S. Magnetic EDTA functionalized CoFe 2O 4 nanoparticles (EDTA-CoFe 2O 4) as a novel catalyst for peroxymonosulfate activation and degradation of Orange G. Environ Sci Pollut Res Int 2017; 24:11536-11548. [PMID: 28321699 DOI: 10.1007/s11356-017-8811-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Accepted: 03/13/2017] [Indexed: 06/06/2023]
Abstract
EDTA functionalized CoFe2O4 nanoparticles (EDTA-CoFe2O4) synthesized using a facile one-pot solvothermal method were employed as catalysts to activate peroxymonosulfate (PMS) with Orange G (OG) as the target pollutant. Effects of operating parameters including initial solution pH, catalyst dosage, PMS dosage, and water matrix components such as Cl-, NO3-, CO32-, and humic acid were evaluated. A degradation efficiency of 93% was achieved in 15 min with 1 mM PMS and 0.2 g/L EDTA-CoFe2O4 catalyst, while only 57% of OG was degraded within 15 min in CoFe2O4/PMS system. The degradation of OG followed pseudo-first-order kinetics, and the apparent first-order date constant (k obs) for OG in EDTA-CoFe2O4/PMS and CoFe2O4/PMS system was determined to be 0.152 and 0.077 min-1, respectively. OG degradation by EDTA-CoFe2O4/PMS was enhanced with the increase of catalyst and PMS doses at respective range of 0.1-2.0 g/L and 0.5-10.0 mM. Higher efficiency of OG oxidation was observed within a wide pH range (3.0-9.0), implying the possibility of applying EDTA-CoFe2O4/PMS process under environmental realistic conditions. Humic acid (HA) at low concentration accelerated the removal of OG; however, a less apparent inhibitive effect was observed at HA addition of 10 mg/L. The k obs value was found to decrease slightly from 0.1601 to 0.1274, 0.1248, and 0.1152 min-1 with the addition of NO3-, CO32-, and Cl-, respectively, but near-complete removal of OG could still be obtained after 15 min. Both of the sulfate radicals and hydroxyl radicals were produced in the reaction, and sulfate radicals were the dominant according to the scavenging tests and electron paramagnetic resonance (EPR) tests. Finally, a degradation mechanism was proposed, and the stability and reusability of the EDTA-CoFe2O4 were evaluated.
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Affiliation(s)
- Lin Deng
- Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha, 410082, People's Republic of China
| | - Zhou Shi
- Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha, 410082, People's Republic of China.
| | - Zhiyan Zou
- Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha, 410082, People's Republic of China
| | - Shiqing Zhou
- Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha, 410082, People's Republic of China
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Lu XF, Gu LF, Wang JW, Wu JX, Liao PQ, Li GR. Bimetal-Organic Framework Derived CoFe 2 O 4 /C Porous Hybrid Nanorod Arrays as High-Performance Electrocatalysts for Oxygen Evolution Reaction. Adv Mater 2017; 29. [PMID: 27865016 DOI: 10.1002/adma.201604437] [Citation(s) in RCA: 323] [Impact Index Per Article: 46.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2016] [Revised: 09/05/2016] [Indexed: 05/11/2023]
Abstract
Porous CoFe2 O4 /C NRAs supported on nickel foam@NC (denoted as NF@NC-CoFe2 O4 /C NRAs) are directly fabricated by the carbonization of bimetal-organic framework NRAs grown on NF@poly-aniline(PANI), and they exhibit high electrocatalytic activity, low overpotential, and high stability for the oxygen evolution reaction in alkaline media.
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Affiliation(s)
- Xue-Feng Lu
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, China
| | - Lin-Fei Gu
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, China
| | - Jia-Wei Wang
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, China
| | - Jun-Xi Wu
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, China
| | - Pei-Qin Liao
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, China
| | - Gao-Ren Li
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, China
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Yao Y, Wu G, Lu F, Wang S, Hu Y, Zhang J, Huang W, Wei F. Enhanced photo-Fenton-like process over Z-scheme CoFe 2O 4/g-C 3N 4 Heterostructures under natural indoor light. Environ Sci Pollut Res Int 2016; 23:21833-21845. [PMID: 27523044 DOI: 10.1007/s11356-016-7329-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2016] [Accepted: 07/26/2016] [Indexed: 05/26/2023]
Abstract
Low-cost catalysts with high activity and stability toward producing strongly oxidative species are extremely desirable, but their development still remains a big challenge. Here, we report a novel strategy for the synthesis of a magnetic CoFe2O4/C3N4 hybrid via a simple self-assembly method. The CoFe2O4/C3N4 was utilized as a photo-Fenton-like catalyst for degradation of organic dyes in the presence of H2O2 under natural indoor light irradiation, a green and energy-saving approach for environmental cleaning. It was found the CoFe2O4/C3N4 hybrid with a CoFe2O4: g-C3N4 mass ratio of 2:1 can completely degrade Rhodamine B nearly 100 % within 210 min under room-light irradiation. The effects of the amount of H2O2 (0.01-0.5 M), initial dye concentration (5-20 mg/L), solution pH (3.08-10.09), fulvic acid concentration (5-50 mg/L), different dyes and catalyst stability on the organic dye degradation were investigated. The introduction of CoFe2O4 on g-C3N4 produced an enhanced separation efficiency of photogenerated electron - hole pairs by a Z-scheme mechanism between the interfaces of g-C3N4 and CoFe2O4, leading to an excellent activity as compared with either g-C3N4 or CoFe2O4 and their mixture. This study demonstrates an efficient way to construct the low-cost magnetic CoFe2O4/C3N4 heterojunction as a typical Z-scheme system in environmental remediation.
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Affiliation(s)
- Yunjin Yao
- Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei, 230009, China.
- CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, 230026, China.
| | - Guodong Wu
- Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei, 230009, China
| | - Fang Lu
- Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei, 230009, China
| | - Shaobin Wang
- Department of Chemical Engineering, Curtin University, GPO Box U1987, Perth, WA, 6845, Australia
| | - Yi Hu
- Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei, 230009, China
| | - Jie Zhang
- Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei, 230009, China
| | - Wanzheng Huang
- Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei, 230009, China
| | - Fengyu Wei
- Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei, 230009, China.
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Tian G, Zhang F, Yao J, Fan H, Li P, Li Z, Song X, Zhang X, Qin M, Zeng M, Zhang Z, Yao J, Gao X, Liu J. Magnetoelectric Coupling in Well-Ordered Epitaxial BiFeO3/ CoFe2O4/SrRuO3 Heterostructured Nanodot Array. ACS Nano 2016; 10:1025-1032. [PMID: 26651132 DOI: 10.1021/acsnano.5b06339] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Multiferroic magnetoelectric (ME) composites exhibit sizable ME coupling at room temperature, promising applications in a wide range of novel devices. For high density integrated devices, it is indispensable to achieve a well-ordered nanostructured array with reasonable ME coupling. For this purpose, we explored the well-ordered array of isolated epitaxial BiFeO3/CoFe2O4/SrRuO3 heterostructured nanodots fabricated by nanoporous anodic alumina (AAO) template method. The arrayed heterostructured nanodots demonstrate well-established epitaxial structures and coexistence of piezoelectric and ferromagnetic properties, as revealed by transmission electron microscopy (TEM) and peizoeresponse/magnetic force microscopy (PFM/MFM). It was found that the heterostructured nanodots yield apparent ME coupling, likely due to the effective transfer of interface couplings along with the substantial release of substrate clamping. A noticeable change in piezoelectric response of the nanodots can be triggered by magnetic field, indicating a substantial enhancement of ME coupling. Moreover, an electric field induced magnetization switching in these nanodots can be observed, showing a large reverse ME effect. These results offer good opportunities of the nanodots for applications in high-density ME devices, e.g., high density recording (>100 Gbit/in.(2)) or logic devices.
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Affiliation(s)
- Guo Tian
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Fengyuan Zhang
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Junxiang Yao
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Hua Fan
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Peilian Li
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Zhongwen Li
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Xiao Song
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Xiaoyan Zhang
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Minghui Qin
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Min Zeng
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Zhang Zhang
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Jianjun Yao
- Asylum Research , Santa Barbara, California 93117, United States
| | - Xingsen Gao
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Junming Liu
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
- Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China
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Kargar A, Yavuz S, Kim TK, Liu CH, Kuru C, Rustomji CS, Jin S, Bandaru PR. Solution-Processed CoFe2O4 Nanoparticles on 3D Carbon Fiber Papers for Durable Oxygen Evolution Reaction. ACS Appl Mater Interfaces 2015; 7:17851-17856. [PMID: 26217939 DOI: 10.1021/acsami.5b04270] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
We report CoFe2O4 nanoparticles (NPs) synthesized using a facile hydrothermal growth and their attachment on 3D carbon fiber papers (CFPs) for efficient and durable oxygen evolution reaction (OER). The CFPs covered with CoFe2O4 NPs show orders of magnitude higher OER performance than bare CFP due to high activity of CoFe2O4 NPs, leading to a small overpotential of 378 mV to get a current density of 10 mA/cm(2). Significantly, the CoFe2O4 NPs-on-CFP electrodes exhibit remarkably long stability evaluated by continuous cycling (over 15 h) and operation with a high current density at a fixed potential (over 40 h) without any morphological change and with preservation of all materials within the electrode. Furthermore, the CoFe2O4 NPs-on-CFP electrodes also exhibit hydrogen evolution reaction (HER) performance, which is considerably higher than that of bare CFP, acting as a bifunctional electrocatalyst. The achieved results show promising potential for efficient, cost-effective, and durable hydrogen generation at large scales using earth-abundant materials and cheap fabrication processes.
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Affiliation(s)
- Alireza Kargar
- †Department of Electrical and Computer Engineering, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Serdar Yavuz
- ‡Materials Science and Engineering Program, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
- §Department of Mechanical and Aerospace Engineering, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Tae Kyoung Kim
- ‡Materials Science and Engineering Program, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
- §Department of Mechanical and Aerospace Engineering, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Chin-Hung Liu
- ‡Materials Science and Engineering Program, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
- §Department of Mechanical and Aerospace Engineering, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Cihan Kuru
- ‡Materials Science and Engineering Program, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
- §Department of Mechanical and Aerospace Engineering, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Cyrus S Rustomji
- ‡Materials Science and Engineering Program, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
- §Department of Mechanical and Aerospace Engineering, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Sungho Jin
- ‡Materials Science and Engineering Program, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
- §Department of Mechanical and Aerospace Engineering, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Prabhakar R Bandaru
- †Department of Electrical and Computer Engineering, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
- ‡Materials Science and Engineering Program, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
- §Department of Mechanical and Aerospace Engineering, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
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Mustaqima M, Yoo P, Huang W, Lee BW, Liu C. Regulation of the forming process and the set voltage distribution of unipolar resistance switching in spin-coated CoFe2O4 thin films. Nanoscale Res Lett 2015; 10:168. [PMID: 25897310 PMCID: PMC4398687 DOI: 10.1186/s11671-015-0876-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Accepted: 03/22/2015] [Indexed: 05/28/2023]
Abstract
We report the preparation of (111) preferentially oriented CoFe2O4 thin films on Pt(111)/TiO2/SiO2/Si substrates using a spin-coating process. The post-annealing conditions and film thickness were varied for cobalt ferrite (CFO) thin films, and Pt/CFO/Pt structures were prepared to investigate the resistance switching behaviors. Our results showed that resistance switching without a forming process is preferred to obtain less fluctuation in the set voltage, which can be regulated directly from the preparation conditions of the CFO thin films. Therefore, instead of thicker film, CFO thin films deposited by two times spin-coating with a thickness about 100 nm gave stable resistance switching with the most stable set voltage. Since the forming process and the large variation in set voltage have been considered as serious obstacles for the practical application of resistance switching for non-volatile memory devices, our results could provide meaningful insights in improving the performance of ferrite material-based resistance switching memory devices.
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Affiliation(s)
- Millaty Mustaqima
- />Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, YongIn, Gyeonggi 449-791 South Korea
| | - Pilsun Yoo
- />Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, YongIn, Gyeonggi 449-791 South Korea
| | - Wei Huang
- />Department of Physics, Semiconductor Photonics Research Center, Xiamen University, Xiamen, 361005 China
| | - Bo Wha Lee
- />Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, YongIn, Gyeonggi 449-791 South Korea
| | - Chunli Liu
- />Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, YongIn, Gyeonggi 449-791 South Korea
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Cai B, Zhao M, Ma Y, Ye Z, Huang J. Bioinspired formation of 3D hierarchical CoFe2O4 porous microspheres for magnetic-controlled drug release. ACS Appl Mater Interfaces 2015; 7:1327-33. [PMID: 25539822 DOI: 10.1021/am507689a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Bioinspired by the morphology of dandelion pollen grains, we successfully prepared a template-free solution-based method for the large-scale preparation of three-dimensional (3D) hierarchical CoFe2O4 porous microspheres. Besides, on the basis of the effect of the reaction time on the morphology evolution of the precursor, we proposed an in situ dissolution-recrystallization growth mechanism with morphology and phase change to understand the formation of dandelion pollenlike microspheres. Doxorubicin hydrochloride, an anticancer drug, is efficiently loaded into the CoFe2O4 microspheres. The magnetic nanoparticles as field-controlled drug carriers offer a unique power of magnetic guidance and field-triggered drug-release behavior. Therefore, 3D hierarchical CoFe2O4 porous microspheres demonstrate the great potential for drug encapsulation and controlled drug-release applications.
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Affiliation(s)
- Bin Cai
- Department of Materials Science and Engineering, State Key Laboratory of Silicon Materials, and ‡Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University , Hangzhou 310027, China
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Drašler B, Drobne D, Novak S, Valant J, Boljte S, Otrin L, Rappolt M, Sartori B, Iglič A, Kralj-Iglič V, Šuštar V, Makovec D, Gyergyek S, Hočevar M, Godec M, Zupanc J. Effects of magnetic cobalt ferrite nanoparticles on biological and artificial lipid membranes. Int J Nanomedicine 2014; 9:1559-81. [PMID: 24741305 PMCID: PMC3970951 DOI: 10.2147/ijn.s57671] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Background The purpose of this work is to provide experimental evidence on the interactions of suspended nanoparticles with artificial or biological membranes and to assess the possibility of suspended nanoparticles interacting with the lipid component of biological membranes. Methods 1-Palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) lipid vesicles and human red blood cells were incubated in suspensions of magnetic bare cobalt ferrite (CoFe2O4) or citric acid (CA)-adsorbed CoFe2O4 nanoparticles dispersed in phosphate-buffered saline and glucose solution. The stability of POPC giant unilamellar vesicles after incubation in the tested nanoparticle suspensions was assessed by phase-contrast light microscopy and analyzed with computer-aided imaging. Structural changes in the POPC multilamellar vesicles were assessed by small angle X-ray scattering, and the shape transformation of red blood cells after incubation in tested suspensions of nanoparticles was observed using scanning electron microscopy and sedimentation, agglutination, and hemolysis assays. Results Artificial lipid membranes were disturbed more by CA-adsorbed CoFe2O4 nanoparticle suspensions than by bare CoFe2O4 nanoparticle suspensions. CA-adsorbed CoFe2O4-CA nanoparticles caused more significant shape transformation in red blood cells than bare CoFe2O4 nanoparticles. Conclusion Consistent with their smaller sized agglomerates, CA-adsorbed CoFe2O4 nanoparticles demonstrate more pronounced effects on artificial and biological membranes. Larger agglomerates of nanoparticles were confirmed to be reactive against lipid membranes and thus not acceptable for use with red blood cells. This finding is significant with respect to the efficient and safe application of nanoparticles as medicinal agents.
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Affiliation(s)
- Barbara Drašler
- University of Ljubljana, Biotechnical Faculty, Department of Biology, Ljubljana, Slovenia
| | - Damjana Drobne
- University of Ljubljana, Biotechnical Faculty, Department of Biology, Ljubljana, Slovenia ; Centre of Excellence in Advanced Materials and Technologies for the Future, Ljubljana, Slovenia ; Centre of Excellence in Nanoscience and Nanotechnology, Ljubljana, Slovenia
| | - Sara Novak
- University of Ljubljana, Biotechnical Faculty, Department of Biology, Ljubljana, Slovenia
| | - Janez Valant
- University of Ljubljana, Biotechnical Faculty, Department of Biology, Ljubljana, Slovenia
| | - Sabina Boljte
- University of Ljubljana, Biotechnical Faculty, Department of Biology, Ljubljana, Slovenia ; Institute of Microbial Sciences and Technologies, Ljubljana, Slovenia
| | - Lado Otrin
- University of Ljubljana, Biotechnical Faculty, Department of Biology, Ljubljana, Slovenia
| | - Michael Rappolt
- Institute of Inorganic Chemistry, Graz University of Technology, Basovizza, Italy ; School of Food Science and Nutrition, University of Leeds, Leeds, UK
| | - Barbara Sartori
- Institute of Inorganic Chemistry, Graz University of Technology, Basovizza, Italy
| | - Aleš Iglič
- Faculty of Electrical Engineering, University of Ljubljana, Ljubljana, Slovenia
| | - Veronika Kralj-Iglič
- Faculty of Health Sciences, Laboratory of Clinical Biophysics, University of Ljubljana, Ljubljana, Slovenia
| | - Vid Šuštar
- Laboratory of Clinical Biophysics, Chair of Orthopaedics, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Darko Makovec
- Centre of Excellence in Nanoscience and Nanotechnology, Ljubljana, Slovenia ; Institute Jožef Stefan, Ljubljana, Slovenia
| | | | - Matej Hočevar
- Institute of Metals and Technology, Ljubljana, Slovenia
| | - Matjaž Godec
- Institute of Metals and Technology, Ljubljana, Slovenia
| | - Jernej Zupanc
- University of Ljubljana, Biotechnical Faculty, Department of Biology, Ljubljana, Slovenia
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Trávníček Z, Zbořil R, Matiková-Maľarová M, Drahoš B, Cernák J. Thermal decomposition of [Co(en)3][Fe(CN)6]∙ 2H2O: Topotactic dehydration process, valence and spin exchange mechanism elucidation. Chem Cent J 2013; 7:28. [PMID: 23391378 PMCID: PMC3637566 DOI: 10.1186/1752-153x-7-28] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Accepted: 01/28/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The Prussian blue analogues represent well-known and extensively studied group of coordination species which has many remarkable applications due to their ion-exchange, electron transfer or magnetic properties. Among them, Co-Fe Prussian blue analogues have been extensively studied due to the photoinduced magnetization. Surprisingly, their suitability as precursors for solid-state synthesis of magnetic nanoparticles is almost unexplored. In this paper, the mechanism of thermal decomposition of [Co(en)3][Fe(CN)6] ∙∙ 2H2O (1a) is elucidated, including the topotactic dehydration, valence and spins exchange mechanisms suggestion and the formation of a mixture of CoFe2O4-Co3O4 (3:1) as final products of thermal degradation. RESULTS The course of thermal decomposition of 1a in air atmosphere up to 600°C was monitored by TG/DSC techniques, (57)Fe Mössbauer and IR spectroscopy. As first, the topotactic dehydration of 1a to the hemihydrate [Co(en)3][Fe(CN)6] ∙∙ 1/2H2O (1b) occurred with preserving the single-crystal character as was confirmed by the X-ray diffraction analysis. The consequent thermal decomposition proceeded in further four stages including intermediates varying in valence and spin states of both transition metal ions in their structures, i.e. [Fe(II)(en)2(μ-NC)Co(III)(CN)4], Fe(III)(NH2CH2CH3)2(μ-NC)2Co(II)(CN)3] and Fe(III)[Co(II)(CN)5], which were suggested mainly from (57)Fe Mössbauer, IR spectral and elemental analyses data. Thermal decomposition was completed at 400°C when superparamagnetic phases of CoFe2O4 and Co3O4 in the molar ratio of 3:1 were formed. During further temperature increase (450 and 600°C), the ongoing crystallization process gave a new ferromagnetic phase attributed to the CoFe2O4-Co3O4 nanocomposite particles. Their formation was confirmed by XRD and TEM analyses. In-field (5 K / 5 T) Mössbauer spectrum revealed canting of Fe(III) spin in almost fully inverse spinel structure of CoFe2O4. CONCLUSIONS It has been found that the thermal decomposition of [Co(en)3][Fe(CN)6] ∙∙ 2H2O in air atmosphere is a gradual multiple process accompanied by the formation of intermediates with different composition, stereochemistry, oxidation as well as spin states of both the central transition metals. The decomposition is finished above 400°C and the ongoing heating to 600°C results in the formation of CoFe2O4-Co3O4 nanocomposite particles as the final decomposition product.
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Affiliation(s)
- Zdeněk Trávníček
- Regional Centre of Advanced Technologies and Materials & Department of Inorganic Chemistry, Palacký University, Tř, 17. listopadu 12, Olomouc, CZ-77146, Czech Republic
| | - Radek Zbořil
- Regional Centre of Advanced Technologies and Materials & Department of Physical Chemistry, Palacký University, Tř, 17. listopadu 12, Olomouc, CZ-77146, Czech Republic
| | - Miroslava Matiková-Maľarová
- Regional Centre of Advanced Technologies and Materials & Department of Inorganic Chemistry, Palacký University, Tř, 17. listopadu 12, Olomouc, CZ-77146, Czech Republic
| | - Bohuslav Drahoš
- Regional Centre of Advanced Technologies and Materials & Department of Inorganic Chemistry, Palacký University, Tř, 17. listopadu 12, Olomouc, CZ-77146, Czech Republic
| | - Juraj Cernák
- Department of Inorganic Chemistry, Institute of Chemistry, Faculty of Sciences, P.J. Šafárik University in Košice, Moyzesova 11, Košice, SK-041 54, Slovakia
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