1
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Jousset Drouhin A, Tait WRT, Moore W, Yu F, Li Y, Werner JG, van Dover RB, Wiesner UB. Block copolymer self-assembly derived mesoporous magnetic materials with three-dimensionally (3D) co-continuous gyroid nanostructure. SOFT MATTER 2024; 20:2767-2776. [PMID: 38441577 DOI: 10.1039/d3sm01622f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
Magnetic nanomaterials are gaining interest for their many applications in technological areas from information science and computing to next-generation quantum energy materials. While magnetic materials have historically been nanostructured through techniques such as lithography and molecular beam epitaxy, there has recently been growing interest in using soft matter self-assembly. In this work, a triblock terpolymer, poly(isoprene-block-styrene-block-ethylene oxide) (ISO), is used as a structure directing agent for aluminosilicate sol nanoparticles and magnetic material precursors to generate organic-inorganic bulk hybrid films with co-continuous morphology. After thermal processing into mesoporous materials, results from a combination of small angle X-ray scattering (SAXS) and scanning electron microscopy (SEM) are consistent with the double gyroid morphology. Nitrogen sorption measurements reveal a type IV isotherm with H1 hysteresis, and yield a specific surface area of around 200 m2 g-1 and an average pore size of 23 nm. The magnetization of the mesostructured material as a function of applied field shows magnetic hysteresis and coercivity at 300 K and 10 K. Comparison of magnetic measurements between the mesoporous gyroid and an unstructured bulk magnetic material, derived from the identical inorganic precursors, reveals the structured material exhibits a coercivity of 250 Oe, opposed to 148 Oe for the unstructured at 10 K, and presence of remnant magnetic moment not conventionally found in bulk hematite; both of these properties are attributed to the mesostructure. This scalable route to mesoporous magnetic materials with co-continuous morphologies from block copolymer self-assembly may provide a pathway to advanced magnetic nanomaterials with a range of potential applications.
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Affiliation(s)
- Amaury Jousset Drouhin
- Department of Materials Science and Engineering, Cornell University, Ithaca, USA.
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, USA
| | - William R T Tait
- Department of Materials Science and Engineering, Cornell University, Ithaca, USA.
- Robert Frederick Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, USA
| | - William Moore
- Department of Materials Science and Engineering, Cornell University, Ithaca, USA.
| | - Fei Yu
- Department of Materials Science and Engineering, Cornell University, Ithaca, USA.
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, USA
| | - Yuanzhi Li
- Department of Mechanical Engineering, Boston University, Boston, USA
| | - Jörg G Werner
- Department of Mechanical Engineering, Boston University, Boston, USA
- Division of Materials Science and Engineering, Boston University, Boston, USA
| | - R Bruce van Dover
- Department of Materials Science and Engineering, Cornell University, Ithaca, USA.
| | - Ulrich B Wiesner
- Department of Materials Science and Engineering, Cornell University, Ithaca, USA.
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2
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Ejeromedoghene O, Hu YP, Oderinde O, Yao F, Akinremi C, Akinyeye R, Adewuyi S, Fu G. Transparent and photochromic poly(hydroxyethyl acrylate–acrylamide)/
WO
3
hydrogel with antibacterial properties against bacterial keratitis in contact lens. J Appl Polym Sci 2022. [DOI: 10.1002/app.51815] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
| | - Yi Ping Hu
- School of Chemistry and Chemical Engineering Southeast University Nanjing China
| | - Olayinka Oderinde
- Department of Chemical Sciences, Faculty of Basic Medical and Applied Sciences Lead City University Ibadan Nigeria
| | - Fang Yao
- School of Chemistry and Chemical Engineering Southeast University Nanjing China
| | - Caroline Akinremi
- Department of Chemistry College of Physical Sciences, Federal University of Agriculture Abeokuta Nigeria
| | - Richard Akinyeye
- Department of Industrial Chemistry Ekiti State University Ado‐Ekiti Nigeria
| | - Sheriff Adewuyi
- Department of Chemistry College of Physical Sciences, Federal University of Agriculture Abeokuta Nigeria
| | - Guodong Fu
- School of Chemistry and Chemical Engineering Southeast University Nanjing China
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3
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Nabiyan A, Max JB, Schacher FH. Double hydrophilic copolymers - synthetic approaches, architectural variety, and current application fields. Chem Soc Rev 2022; 51:995-1044. [PMID: 35005750 DOI: 10.1039/d1cs00086a] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Solubility and functionality of polymeric materials are essential properties determining their role in any application. In that regard, double hydrophilic copolymers (DHC) are typically constructed from two chemically dissimilar but water-soluble building blocks. During the past decades, these materials have been intensely developed and utilised as, e.g., matrices for the design of multifunctional hybrid materials, in drug carriers and gene delivery, as nanoreactors, or as sensors. This is predominantly due to almost unlimited possibilities to precisely tune DHC composition and topology, their solution behavior, e.g., stimuli-response, and potential interactions with small molecules, ions and (nanoparticle) surfaces. In this contribution we want to highlight that this class of polymers has experienced tremendous progress regarding synthesis, architectural variety, and the possibility to combine response to different stimuli within one material. Especially the implementation of DHCs as versatile building blocks in hybrid materials expanded the range of water-based applications during the last two decades, which now includes also photocatalysis, sensing, and 3D inkjet printing of hydrogels, definitely going beyond already well-established utilisation in biomedicine or as templates.
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Affiliation(s)
- Afshin Nabiyan
- Institute of Organic Chemistry and Macromolecular Chemistry (IOMC), Friedrich-Schiller University Jena, Lessingstraße 8, D-07743 Jena, Germany. .,Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, D-07743 Jena, Germany.,Center for Energy and Environmental Chemistry Jena (CEEC Jena), Philosophenweg 7a, 07743 Jena, Germany
| | - Johannes B Max
- Institute of Organic Chemistry and Macromolecular Chemistry (IOMC), Friedrich-Schiller University Jena, Lessingstraße 8, D-07743 Jena, Germany. .,Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, D-07743 Jena, Germany.,Center for Energy and Environmental Chemistry Jena (CEEC Jena), Philosophenweg 7a, 07743 Jena, Germany
| | - Felix H Schacher
- Institute of Organic Chemistry and Macromolecular Chemistry (IOMC), Friedrich-Schiller University Jena, Lessingstraße 8, D-07743 Jena, Germany. .,Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, D-07743 Jena, Germany.,Center for Energy and Environmental Chemistry Jena (CEEC Jena), Philosophenweg 7a, 07743 Jena, Germany
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4
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Antonoglou O, Giannousi K, Mourdikoudis S, Dendrinou-Samara C. Magnetic nanoemulsions as candidates for Alzheimer's disease dual imaging theranostics. NANOTECHNOLOGY 2020; 31:465702. [PMID: 32750688 DOI: 10.1088/1361-6528/abac35] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Alzheimer's disease (AD) is the most prevalent cause of dementia linked to the accumulation of amyloid-beta (Aβ) plaques-fibrils that impair cognitive functions. Magnetic nanoparticles (MNPs) are emerging as promising tools for the crusade against AD owning to appropriate biocompatibility and facile functionalization that can lead to theranostic agents. Herein, the fabrication of a multimodal (magnetic resonance imaging (MRI), fluorescence imaging, and drug carrier) magnetic nanoemulsion (MNE) is reported as an AD theranostic candidate. Initially zinc ferrite MNPs of high saturation magnetization (129 emu g-1) were synthesized through a modified microwave-assisted polyol process. Memantine (a registered AD drug) was labeled with fluorescein (Mem-Flu) and encapsulated with the MNPs in sodium dodecyl sulfate micelles to form the MNE. Small hydrodynamic size (107), high encapsulation (77.5%) and loading efficiencies (86.1%) and sufficient transverse relaxivity (48.7 mM-1 s-1) were achieved through the design while sustained release of Mem-Flu was unveiled by in zero-order, first-order, Higuchi and Korsmeyer-Peppas pharmacokinetic models. Moreover, the MNE acquired fluorescence imaging ability of Aβ1-42 peptide monomers and/or plaques-fibrils via the fluorescein labeling of Memantine. A novel inorganic-organic hybrid multimodal AD theranostic candidate is presented.
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Affiliation(s)
- Orestis Antonoglou
- Laboratory of Inorganic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
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5
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Formation of Free-Standing Inverse Opals with Gradient Pores. NANOMATERIALS 2020; 10:nano10101923. [PMID: 32993122 PMCID: PMC7600223 DOI: 10.3390/nano10101923] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 09/21/2020] [Accepted: 09/21/2020] [Indexed: 01/20/2023]
Abstract
We demonstrate the fabrication of free-standing inverse opals with gradient pores via a combination of electrophoresis and electroplating techniques. Our processing scheme starts with the preparation of multilayer colloidal crystals by conducting sequential electrophoresis with polystyrene (PS) microspheres in different sizes (300, 600, and 1000 nm). The critical factors affecting the stacking of individual colloidal crystals are discussed and relevant electrophoresis parameters are identified so the larger PS microspheres are assembled successively atop of smaller ones in an orderly manner. In total, we construct multilayer colloidal crystals with vertical stacking of microspheres in 300/600, 300/1000, and 300/600/1000 nm sequences. The inverse opals with gradient pores are produced by galvanostatic plating of Ni, followed by the selective removal of colloidal template. Images from scanning electron microscopy exhibit ideal multilayer close-packed structures with well-defined boundaries among different layers. Results from porometer analysis reveal the size of bottlenecks consistent with those of interconnected pore channels from inverse opals of smallest PS microspheres. Mechanical properties determined by nanoindentation tests indicate significant improvements for multilayer inverse opals as compared to those of conventional single-layer inverse opals.
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6
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Mete S, Goswami KG, De P. Composition‐dependent crystallization behavior of copolyperoxides from methyl methacrylate and 4‐vinylbenzyl stearate. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20200029] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Sourav Mete
- Department of Chemical SciencesPolymer Research Center and Center for Advanced Functional Materials, Indian Institute of Science Education and Research Kolkata Nadia West Bengal India
| | - Krishna Gopal Goswami
- Department of Chemical SciencesPolymer Research Center and Center for Advanced Functional Materials, Indian Institute of Science Education and Research Kolkata Nadia West Bengal India
| | - Priyadarsi De
- Department of Chemical SciencesPolymer Research Center and Center for Advanced Functional Materials, Indian Institute of Science Education and Research Kolkata Nadia West Bengal India
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7
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Padmanabhan A, Kaushik M, Niranjan R, Richards JS, Ebright B, Venkatasubbu GD. Zinc Oxide nanoparticles induce oxidative and proteotoxic stress in ovarian cancer cells and trigger apoptosis Independent of p53-mutation status. APPLIED SURFACE SCIENCE 2019; 487:807-818. [PMID: 32042215 PMCID: PMC7009796 DOI: 10.1016/j.apsusc.2019.05.099] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Ovarian cancer continues to be the most lethal among gynecological malignancies and the major cause for cancer-associated mortality among women. Limitations of current ovarian cancer therapeutics is highlighted by the high frequency of drug-resistant recurrent tumors and the extremely poor 5-year survival rates. Zinc oxide nanoparticles (ZnO-NPs) have shown promise in various biomedical applications including utility as anti-cancer agents. Here, we describe the synthesis and characterization of physical properties of ZnO-NPs of increasing particle size (15 nm - 55 nm) and evaluate their benefits as an ovarian cancer therapeutic using established human ovarian cancer cell lines. Our results demonstrate that the ZnO-NPs induce acute oxidative and proteotoxic stress in ovarian cancer cells leading to their death via apoptosis. The cytotoxic effect of the ZnO-NPs was found to increase slightly with a decrease in nanoparticle size. While ZnO-NPs caused depletion of both wild-type and gain-of-function (GOF) mutant p53 protein in ovarian cancer cells, their ability to induce apoptosis was found to be independent of the p53-mutation status in these cells. Taken together, these results highlight the potential of ZnO-NPs to serve as an anti-cancer therapeutic agent for treating ovarian cancers independent of the p53 mutants of the cancer cells.
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Affiliation(s)
- Achuth Padmanabhan
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX. 77030. USA
- Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX. 77030. USA
- Center for Reproductive Medicine, Baylor College of Medicine, Houston, TX. 77030. USA
- Co-corresponding authors
| | - M Kaushik
- Department of Nanotechnology, SRM Institute of Science and Technology, Tamil Nadu. 603203. India
| | - R Niranjan
- Department of Nanotechnology, SRM Institute of Science and Technology, Tamil Nadu. 603203. India
| | - JoAnne S Richards
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX. 77030. USA
- Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX. 77030. USA
- Center for Reproductive Medicine, Baylor College of Medicine, Houston, TX. 77030. USA
| | - Brandon Ebright
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX. 77030. USA
| | - G Devanand Venkatasubbu
- Department of Nanotechnology, SRM Institute of Science and Technology, Tamil Nadu. 603203. India
- Co-corresponding authors
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8
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Tao C, Chen Y, Wang D, Cai Y, Zheng Q, An L, Lin J, Tian Q, Yang S. Macromolecules with Different Charges, Lengths, and Coordination Groups for the Coprecipitation Synthesis of Magnetic Iron Oxide Nanoparticles as T1 MRI Contrast Agents. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E699. [PMID: 31060287 PMCID: PMC6567071 DOI: 10.3390/nano9050699] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 04/17/2019] [Accepted: 04/19/2019] [Indexed: 12/12/2022]
Abstract
Considerable efforts have been focused on the exploitation of macromolecule ligands for synthesis of magnetic Fe3O4 nanoparticles as T1 magnetic resonance imaging (MRI) contrast agents, but studies that concern macromolecule ligands with different charges and coordination groups are still limited. Herein, we used poly(acrylic acid) (PAA), poly(allylamine hydrochloride) (PAH), and polyvinyl alcohol (PVA), which possess negative, positive and neutral charges with carboxylic acid, amino and hydroxyl groups respectively, as templates and stabilizers to fabricate Fe3O4 nanoparticles through coprecipitation reaction. The obtained Fe3O4-PAA, Fe3O4-PAH, and Fe3O4-PVA nanoparticles showed T1 contrast performance with r1 relaxivities of 23.4, 60.3, and 30.6 mM s-1 at 0.5 T (25 °C), and a r2/r1 ratio of 2.62, 3.82, and 7.26, respectively. The cell viability assay revealed that Fe3O4-PAA and Fe3O4-PVA exhibited good biocompatibility, while Fe3O4-PAH displayed high cytotoxicity. In vivo T1-weighted (1 T) mice showed that both Fe3O4-PAA and Fe3O4-PVA were able to display remarkably brighten the contrast enhancement for the mice tumor and kidney sites, but Fe3O4-PAA had better contrast performance. This work highlights that the macromolecule ligands play an important role in the biocompatibility and T1 contrast performance of magnetic Fe3O4 nanoparticles.
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Affiliation(s)
- Cheng Tao
- The Key Laboratory of Resource Chemistry of the Ministry of Education, The Shanghai Key Laboratory of Rare Earth Functional Materials, and The Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors, Shanghai Normal University, Shanghai 200234, China.
| | - Yanan Chen
- The Key Laboratory of Resource Chemistry of the Ministry of Education, The Shanghai Key Laboratory of Rare Earth Functional Materials, and The Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors, Shanghai Normal University, Shanghai 200234, China.
| | - Danli Wang
- The Key Laboratory of Resource Chemistry of the Ministry of Education, The Shanghai Key Laboratory of Rare Earth Functional Materials, and The Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors, Shanghai Normal University, Shanghai 200234, China.
| | - Yu Cai
- The Key Laboratory of Resource Chemistry of the Ministry of Education, The Shanghai Key Laboratory of Rare Earth Functional Materials, and The Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors, Shanghai Normal University, Shanghai 200234, China.
| | - Qiang Zheng
- The Key Laboratory of Resource Chemistry of the Ministry of Education, The Shanghai Key Laboratory of Rare Earth Functional Materials, and The Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors, Shanghai Normal University, Shanghai 200234, China.
| | - Lu An
- The Key Laboratory of Resource Chemistry of the Ministry of Education, The Shanghai Key Laboratory of Rare Earth Functional Materials, and The Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors, Shanghai Normal University, Shanghai 200234, China.
| | - Jiaomin Lin
- The Key Laboratory of Resource Chemistry of the Ministry of Education, The Shanghai Key Laboratory of Rare Earth Functional Materials, and The Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors, Shanghai Normal University, Shanghai 200234, China.
| | - Qiwei Tian
- The Key Laboratory of Resource Chemistry of the Ministry of Education, The Shanghai Key Laboratory of Rare Earth Functional Materials, and The Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors, Shanghai Normal University, Shanghai 200234, China.
| | - Shiping Yang
- The Key Laboratory of Resource Chemistry of the Ministry of Education, The Shanghai Key Laboratory of Rare Earth Functional Materials, and The Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors, Shanghai Normal University, Shanghai 200234, China.
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9
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Nguyen VTA, De Pauw-Gillet MC, Gauthier M, Sandre O. Magnetic Polyion Complex Micelles for Cell Toxicity Induced by Radiofrequency Magnetic Field Hyperthermia. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 8:E1014. [PMID: 30563227 PMCID: PMC6316531 DOI: 10.3390/nano8121014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2018] [Revised: 12/01/2018] [Accepted: 12/03/2018] [Indexed: 12/19/2022]
Abstract
Magnetic nanoparticles (MNPs) of magnetite (Fe₃O₄) were prepared using a polystyrene-graft-poly(2-vinylpyridine) copolymer (denoted G0PS-g-P2VP or G1) as template. These MNPs were subjected to self-assembly with a poly(acrylic acid)-block-poly(2-hydroxyethyl acrylate) double-hydrophilic block copolymer (DHBC), PAA-b-PHEA, to form water-dispersible magnetic polyion complex (MPIC) micelles. Large Fe₃O₄ crystallites were visualized by transmission electron microscopy (TEM) and magnetic suspensions of MPIC micelles exhibited improved colloidal stability in aqueous environments over a wide pH and ionic strength range. Biological cells incubated for 48 h with MPIC micelles at the highest concentration (1250 µg of Fe₃O₄ per mL) had a cell viability of 91%, as compared with 51% when incubated with bare (unprotected) MNPs. Cell internalization, visualized by confocal laser scanning microscopy (CLSM) and TEM, exhibited strong dependence on the MPIC micelle concentration and incubation time, as also evidenced by fluorescence-activated cell sorting (FACS). The usefulness of MPIC micelles for cellular radiofrequency magnetic field hyperthermia (MFH) was also confirmed, as the MPIC micelles showed a dual dose-dependent effect (concentration and duration of magnetic field exposure) on the viability of L929 mouse fibroblasts and U87 human glioblastoma epithelial cells.
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Affiliation(s)
- Vo Thu An Nguyen
- University Bordeaux, LCPO, UMR 5629, F-33600 Pessac, France.
- Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
- CNRS, Laboratoire de Chimie des Polymères Organiques, UMR 5629, F-33600 Pessac, France.
| | | | - Mario Gauthier
- Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
| | - Olivier Sandre
- University Bordeaux, LCPO, UMR 5629, F-33600 Pessac, France.
- CNRS, Laboratoire de Chimie des Polymères Organiques, UMR 5629, F-33600 Pessac, France.
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10
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Yao H, Li X, Shi X, Qiu G, Lu X. Synthesis and self-assembly of multiple-responsive magnetic nanogels. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4467] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Haiyang Yao
- College of Chemistry, Chemical Engineering and Biotechnology; Donghua University; Shanghai 201620 China
| | - Xueting Li
- College of Chemistry, Chemical Engineering and Biotechnology; Donghua University; Shanghai 201620 China
| | - Xiaodi Shi
- College of Chemistry, Chemical Engineering and Biotechnology; Donghua University; Shanghai 201620 China
| | - Gao Qiu
- College of Chemistry, Chemical Engineering and Biotechnology; Donghua University; Shanghai 201620 China
| | - Xihua Lu
- College of Chemistry, Chemical Engineering and Biotechnology; Donghua University; Shanghai 201620 China
- Anhui Microdelivery Smart Microcapsule Sci. & Tech. Co., Ltd.; 1188 Xihu First Road Tongling Anhui 244000 China
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11
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Magnetic Fe@FeO x, Fe@C and α-Fe₂O₃ Single-Crystal Nanoblends Synthesized by Femtosecond Laser Ablation of Fe in Acetone. NANOMATERIALS 2018; 8:nano8080631. [PMID: 30127303 PMCID: PMC6116272 DOI: 10.3390/nano8080631] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 08/17/2018] [Accepted: 08/18/2018] [Indexed: 11/17/2022]
Abstract
There are few reports on zero-field-cooled (ZFC) magnetization measurements for Fe@FeOx or FeOx particles synthesized by laser ablation in liquids (LAL) of Fe, and the minimum blocking temperature (TB) of 120 K reported so far is still much higher than those of their counterparts synthesized by chemical methods. In this work, the minimum blocking temperature was lowered to 52 K for 4⁻5 nm α-Fe₂O₃ particles synthesized by femtosecond laser ablation of Fe in acetone. The effective magnetic anisotropy energy density (Keff) is calculated to be 2.7⁻5.4 × 10⁵ J/m³, further extending the Keff values for smaller hematite particles synthesized by different methods. Large amorphous-Fe@α-Fe₂O₃ and amorphous-Fe@C particles of 10⁻100 nm in diameter display a soft magnetic behavior with saturation magnetization (Ms) and coercivities (Hc) values of 72.5 emu/g and 160 Oe at 5 K and 61.9 emu/g and 70 Oe at 300 K, respectively, which mainly stem from the magnetism of amorphous Fe cores. Generally, the nanoparticles obtained by LAL are either amorphous or polycrystalline, seldom in a single-crystalline state. This work also demonstrates the possibility of synthesizing single-crystalline α-Fe₂O₃ hematite crystals of several nanometers with (104), (113), (116) or (214) crystallographic orientations, which were produced simultaneously with other products including carbon encapsulated amorphous Fe (a-Fe@C) and Fe@FeOx core-shell particles by LAL in one step. Finally, the formation mechanisms for these nanomaterials are proposed and the key factors in series events of LAL are discussed.
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12
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Yao L, Li X, Wang T, Zhao Y. Design and Synthesis of Cross-Linked Micellar Particles to Assist Microalgae Lipid Recovery from Aqueous Extract. J AM OIL CHEM SOC 2015. [DOI: 10.1007/s11746-015-2744-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Diodati S, Dolcet P, Casarin M, Gross S. Pursuing the Crystallization of Mono- and Polymetallic Nanosized Crystalline Inorganic Compounds by Low-Temperature Wet-Chemistry and Colloidal Routes. Chem Rev 2015; 115:11449-502. [DOI: 10.1021/acs.chemrev.5b00275] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stefano Diodati
- Dipartimento
di Scienze Chimiche, Università degli Studi di Padova, via
Marzolo, 1, I-35131, Padova, Italy
| | - Paolo Dolcet
- Dipartimento
di Scienze Chimiche, Università degli Studi di Padova, via
Marzolo, 1, I-35131, Padova, Italy
- Istituto per l’Energetica e le Interfasi, IENI-CNR and INSTM, UdR Padova, via Marzolo, 1, I-35131, Padova, Italy
| | - Maurizio Casarin
- Dipartimento
di Scienze Chimiche, Università degli Studi di Padova, via
Marzolo, 1, I-35131, Padova, Italy
- Istituto per l’Energetica e le Interfasi, IENI-CNR and INSTM, UdR Padova, via Marzolo, 1, I-35131, Padova, Italy
| | - Silvia Gross
- Dipartimento
di Scienze Chimiche, Università degli Studi di Padova, via
Marzolo, 1, I-35131, Padova, Italy
- Istituto per l’Energetica e le Interfasi, IENI-CNR and INSTM, UdR Padova, via Marzolo, 1, I-35131, Padova, Italy
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14
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Harris RA, Shumbula PM, van der Walt H. Analysis of the interaction of surfactants oleic acid and oleylamine with iron oxide nanoparticles through molecular mechanics modeling. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:3934-43. [PMID: 25768034 DOI: 10.1021/acs.langmuir.5b00671] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The interface interactions between surfactants oleic acid and oleylamine and magnetic nanoparticles are studied via molecular mechanics and dynamics. Mixtures of these two surfactants are widely advocated in the chemical synthesis of nanoparticles. However, the exact dynamic mechanism remains unclear. Here we report, for the first time, a comprehensive qualitative model showing the importance of acid-base complex formation between oleic acid and oleylamine as well as the presence of free protons in the engineering of nanoparticles of specific shapes and sizes. We show why critical parameters such as surfactant concentration may modify iron oxide nanoparticle shape and size and how this can be understood in the light of acid-base complex pair formation. We report on the influence these parameters have on both the in situ nanoparticle surface charge and zeta potential. Transmission electron microscopy (TEM), FTIR, and pH studies are used to confirm the validity of the calculated binding energies and number of acid-base pairs.
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Affiliation(s)
- Richard Anthony Harris
- DST/Mintek Nanotechnology Innovation Centre, Advanced Materials Division, Mintek, Private Bag X3015,Randburg, Johannesburg 2125, South Africa
| | - Poslet Morgan Shumbula
- DST/Mintek Nanotechnology Innovation Centre, Advanced Materials Division, Mintek, Private Bag X3015,Randburg, Johannesburg 2125, South Africa
| | - Hendriëtte van der Walt
- DST/Mintek Nanotechnology Innovation Centre, Advanced Materials Division, Mintek, Private Bag X3015,Randburg, Johannesburg 2125, South Africa
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