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Journal articles on the topic 'Silica coated magnetic particles'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Klug, Kevin L., Vinayak P. Dravid, and D. Lynn Johnson. "Silica-encapsulated magnetic nanoparticles formed by a combined arc evaporation/chemical vapor deposition technique." Journal of Materials Research 18, no. 4 (April 2003): 988–93. http://dx.doi.org/10.1557/jmr.2003.0135.

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A multistep technique has been developed for the generation of metallic/alloy nanoparticles coated with amorphous silica. As a proof of concept, an inert-gas blown-arc geometry was used to create nanoparticles from a bulk nickel source, and silica coating formation was accomplished via tetraethyloxysilane (TEOS) decomposition over the nanoparticles in an adjacent chemical vapor deposition chamber. The composite particles exhibit resistance to hydrochloric acid attack over extended times, thereby confirming the protective nature of the silica coating, and magnetic measurements indicate a superparamagnetic transition temperature of 41 K. TEOS flow rate was found to have a profound effect on particle morphology, and individually coated dispersed particles were observed for the intermediate flow rate studied. These results, combined with the well-established field of silica functionalization, offer the possibility that a variety of industrially significant coated magnetic nanostructures may be synthesized with this versatile approach.

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Izza Taib, Nurul, Timothy G. St. Pierre, Robert C. Woodward, and Michael J. House. "Magnetic Properties of Magnetite Nanoparticles (Fe3O4-NPs) Coated with Mesoporous Silica by Surfactant Templated Sol-Gel Method." International Journal of Engineering & Technology 7, no. 4.14 (December 24, 2019): 533. http://dx.doi.org/10.14419/ijet.v7i4.14.27785.

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Here, we present the magnetic properties of silica-coated magnetite nanoparticles. We have coated 7 nm of Fe3O4 with cetyltrimethylammonium bromide (CTAB) for phase transformation from hydrophobic to hydrophilic. Core-shell structure of silica-coated magnetite nanoparticles have been obtained using surfactant templated sol-gel method. The obtained silica-coated magnetite nanoparticles were characterized by transmission electron microscopy (TEM), fourier transform infrared (FTIR) spectroscopy and superconducting quantum interference device (SQuID). The hysteresis loops of the coated particles were measured using SQuID and the results showed a superparamagnetic behavior at room temperature. The saturation magnetization (Ms) of the coated particles indicate the presence of non-magnetic surface layers resulting from the strong chemical attachment of the silica to the Fe3O4’s surface, also observed by FTIR spectroscopy.

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3

DODBIBA, GJERGJ, KENJI ONO, HYUN SEO PARK, SEIJI MATSUO, and TOYOHISA FUJITA. "FeNbVB ALLOY PARTICLES SUSPENDED IN LIQUID GALLIUM: INVESTIGATING THE MAGNETIC PROPERTIES OF THE MR SUSPENSION." International Journal of Modern Physics B 25, no. 07 (March 20, 2011): 947–55. http://dx.doi.org/10.1142/s0217979211058444.

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A MR suspension was prepared by dispersing silica-coated iron alloy particles into a liquid gallium. In other words, the iron alloy particles of 30 to 50 nm in diameter were first prepared and then coated with silica. Next, the particles were then suspended in a liquid Ga (assay: 99.9999%). In addition, the magnetic properties of the synthesized particles and suspension under the influence of the magnetic field were investigated. One of the main findings of this study is that the prepared powder showed a temperature sensitive of magnetization within the testing temperature range of 293–353 K. The saturation magnetization of silica-coated FeNbVB particles was about 0.55 T, whereas the saturation magnetization (297 K) of the synthesized MR suspension was 0.019 T.

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4

Park, Moo Eon, Ki Ho Kang, Kyung Ja Kim, and Jeong Ho Chang. "The Selective Protein Separations with Polyaminofunctionality on Controlled Silica Coating-Layers of Magnetic Nanoparticles." Solid State Phenomena 124-126 (June 2007): 903–6. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.903.

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This work reported the development of the high throughput protein separation process with molecularly assembled silica-coated magnetic nanoparticles as a function of amino group numbers such as mono-, di-, and tri-aminofunctionality, in which the range of silica coating thicknesses were optimized to be interacted with protein. The protein separation efficiency was demonstrated as a function of each aminofunctional group and the particle sizes of the silica coated magnetic nanoparticles. The particles were prepared by the chemical precipitation of Fe2+ and Fe3+ salts with a molar ratio of 1:2 under basic solution. The silica coated magnetic nanoparticles were directly produced by the sol-gel reaction of a tetraethyl orthosilicate (TEOS) precursor, in which the coating layer serves as a biocompatible and versatile group for further biomolecular functionalization. To effectively capture the proteins, silica coated magnetic nanoparticles need to be functionalized reproducibly on the silica surface, and three kinds of amino functional groups were adapted as a function of number of amine using the mono-, di-, and tri-aminopropylalkoxysilanes.

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5

Tawkaew, Sittinun, and Sitthisuntorn Supothina. "Preparation of agglomerated particles of TiO2 and silica-coated magnetic particle." Materials Chemistry and Physics 108, no. 1 (March 2008): 147–53. http://dx.doi.org/10.1016/j.matchemphys.2007.09.026.

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6

Reufer, M., H. Dietsch, U. Gasser, B. Grobety, A. M. Hirt, V. K. Malik, and P. Schurtenberger. "Magnetic properties of silica coated spindle-type hematite particles." Journal of Physics: Condensed Matter 23, no. 6 (January 24, 2011): 065102. http://dx.doi.org/10.1088/0953-8984/23/6/065102.

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7

Veverka, M., K. Závěta, O. Kaman, P. Veverka, K. Knížek, E. Pollert, M. Burian, and P. Kašpar. "Magnetic heating by silica-coated Co–Zn ferrite particles." Journal of Physics D: Applied Physics 47, no. 6 (January 20, 2014): 065503. http://dx.doi.org/10.1088/0022-3727/47/6/065503.

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8

Zhao, Yue, Shizhao Kang, Pingping Yao, Yi Zhao, Xiangnong Liu, Yuxiang Yang, and Chaoying Ni. "Construction of Carbon Dots Coated Magnetic Hollow Silica Spheres." Journal of Nanoscience and Nanotechnology 19, no. 11 (November 1, 2019): 7456–63. http://dx.doi.org/10.1166/jnn.2019.16673.

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Magnetic hollow silica spheres (MHSS) with uniform cavity size and shell thickness were prepared using functionalized SiO2 spheres as templates, on which the magnetic particles were uniformly deposited on their surface. The obtained MHSS exhibited a super-paramagnetic behavior at room temperature. Due to large hollow cavity space and super-paramagnetic characteristics, the MHSS were coated with carbon dots with assistance of (3-Aminopropyl) trimethoxysilane (APS). Thus, the preparedMHSS were mixed with citric acid and APS, followed by hydrothermal reaction at 180 °C, to generate carbon quantum dots coated MHSS (MHSS@CDs). Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder scattering (XRD), X-ray energy dispersive spectral analysis (EDS), Raman spectra and laser scattering particle analyzer were applied to characterize the MHSS and MHSS@CDs.

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9

Liu, Wen Bao, Bing Jun Yang, Wan Li Yang, Wen Li, Jiao Yang, and Mei Zhen Gao. "Synthesis of Magnetic Particles and Silica Coated Core-Shell Materials." Advanced Materials Research 631-632 (January 2013): 490–93. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.490.

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Ferrite particles were prepared by hydrothermal process at high temperature. The characterization of ferrite was examined by XRD, Mössbauer spectrum, and SEM. The XRD and Mössbauer spectrum confirmed that ferrite particles have a Fe3O4 inverse spinel structure, the SEM results show that each Fe3O4 particles were composed of many smaller magnetite nanoparticles. The as-synthesized Fe3O4 particles were modified by sodium citrate then further coated with SiO2 layer through the modified stöber method. The composited Fe3O4@SiO2 microspheres exhibited outstanding monodispersity and magnetic property.

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10

Lucht, Niklas, Ralf P. Friedrich, Sebastian Draack, Christoph Alexiou, Thilo Viereck, Frank Ludwig, and Birgit Hankiewicz. "Biophysical Characterization of (Silica-coated) Cobalt Ferrite Nanoparticles for Hyperthermia Treatment." Nanomaterials 9, no. 12 (December 1, 2019): 1713. http://dx.doi.org/10.3390/nano9121713.

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Magnetic hyperthermia is a technique that describes the heating of material through an external magnetic field. Classic hyperthermia is a medical condition where the human body overheats, being usually triggered by a heat stroke, which can lead to severe damage to organs and tissue due to the denaturation of cells. In modern medicine, hyperthermia can be deliberately induced to specified parts of the body to destroy malignant cells. Magnetic hyperthermia describes the way that this overheating is induced and it has the inherent advantage of being a minimal invasive method when compared to traditional surgery methods. This work presents a particle system that offers huge potential for hyperthermia treatments, given its good loss value, i.e., the particles dissipate a lot of heat to their surroundings when treated with an ac magnetic field. The measurements were performed in a low-cost custom hyperthermia setup. Additional toxicity assessments on Jurkat cells show a very low short-term toxicity on the particles and a moderate low toxicity after two days due to the prevalent health concerns towards nanoparticles in organisms.

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11

Reza, Raúl, Carlos Martínez Pérez, Claudia Rodríguez González, Humberto Romero, and Perla García Casillas. "Effect of the polymeric coating over Fe3O4 particles used for magnetic separation." Open Chemistry 8, no. 5 (October 1, 2010): 1041–46. http://dx.doi.org/10.2478/s11532-010-0073-4.

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AbstractIn this work, the synthesis of magnetite nanoparticles by two variant chemical coprecipitation methods that involve reflux and aging conditions was investigated. The influence of the synthesis conditions on particle size, morphology, magnetic properties and protein adsorption were studied. The synthesized magnetite nanoparticles showed a spherical shape with an average particle size directly influenced by the synthesis technique. Particles of average size 27 nm and 200 nm were obtained. When the coprecipitation method was used without reflux and aging, the smallest particles were obtained. Magnetite nanoparticles obtained from both methods exhibited a superparamagnetic behavior and their saturation magnetization was particle size dependent. Values of 67 and 78 emu g−1 were obtained for the 27 nm and 200 nm magnetite particles, respectively. The nanoparticles were coated with silica, aminosilane, and silica-aminosilane shell. The influence of the coating on protein absorption was studied using Bovine Serum Albumin (BSA) protein.

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12

Wang, Guihua, and Andrew Harrison. "Preparation of Iron Particles Coated with Silica." Journal of Colloid and Interface Science 217, no. 1 (September 1999): 203–7. http://dx.doi.org/10.1006/jcis.1999.6339.

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13

Andrade, A. L., D. M. Souza, M. C. Pereira, J. D. Fabris, and R. Z. Domingues. "Synthesis and characterization of magnetic nanoparticles coated with silica through a sol-gel approach." Cerâmica 55, no. 336 (December 2009): 420–24. http://dx.doi.org/10.1590/s0366-69132009000400013.

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This paper investigates the influence of reaction medium pH on silica-coating of magnetite nanoparticles. Magnetite nanoparticles were prepared by means of a reduction-precipitation method using ferric chloride as a starting material, which was partially reduced to ferrous salts by Na2SO3 before alkalinizing with ammonia. The particles were coated by sol-gel method with either ammonia or HCl aqueous solutions for either base- or acid-catalyzed hydrolysis, respectively. Powder X-ray diffraction, Fourier-transform infrared, and Zeta Potential were used for the characterization of oxides and of the coated magnetic nanoparticles. The observed difference of pH IEP in KCl solution for pure silica (2.0), magnetite (5.0), and silica-coated magnetite (2.3) samples confirms that the coating process was effective since the charge surface properties of coated magnetic nanoparticles are close to that of pure silica, even though the Fourier-transform infrared spectra did not evidence the formation of Fe-O-Si bonds.

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14

Pham, Xuan-Hung, San Kyeong, Jaein Jang, Hyung-Mo Kim, Jaehi Kim, Seunho Jung, Yoon-Sik Lee, Bong-Hyun Jun, and Woo-Jae Chung. "Facile Method for Preparation of Silica Coated Monodisperse Superparamagnetic Microspheres." Journal of Nanomaterials 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/1730403.

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This paper presents a facile method for preparation of silica coated monodisperse superparamagnetic microsphere. Herein, monodisperse porous polystyrene-divinylbenzene microbeads were prepared by seeded emulsion polymerization and subsequently sulfonated with acetic acid/H2SO4. The as-prepared sulfonated macroporous beads were magnetized in presence of Fe2+/Fe3+under alkaline condition and were subjected to silica coating by sol-gel process, providing water compatibility, easily modifiable surface form, and chemical stability. FE-SEM, TEM, FT-IR, and TGA were employed to characterize the silica coated monodisperse magnetic beads (~7.5 μm). The proposed monodisperse magnetic beads can be used as mobile solid phase particles candidate for protein and DNA separation.

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15

Li, Ying-Sing, Jeffrey S. Church, Andrea L. Woodhead, and Filsun Moussa. "Preparation and characterization of silica coated iron oxide magnetic nano-particles." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 76, no. 5 (September 2010): 484–89. http://dx.doi.org/10.1016/j.saa.2010.04.004.

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16

Wang, Hongzhi, Hiroyuki Nakamura, Ken Yao, Hideaki Maeda, and Eiichi Abe. "Effect of Solvents on the Preparation of Silica-Coated Magnetic Particles." Chemistry Letters 30, no. 11 (November 2001): 1168–69. http://dx.doi.org/10.1246/cl.2001.1168.

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17

Hong-Ying, Jiang, Zhong Wei, Tang Nu-Jiang, Liu Xian-Song, and Du You-Wei. "Chemical Synthesis of Highly Magnetic, Air-Stable Silica-Coated iron Particles." Chinese Physics Letters 20, no. 10 (September 24, 2003): 1855–57. http://dx.doi.org/10.1088/0256-307x/20/10/357.

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18

Girginova, Penka I., Ana L. Daniel-da-Silva, Cláudia B. Lopes, Paula Figueira, Marta Otero, Vítor S. Amaral, Eduarda Pereira, and Tito Trindade. "Silica coated magnetite particles for magnetic removal of Hg2+ from water." Journal of Colloid and Interface Science 345, no. 2 (May 2010): 234–40. http://dx.doi.org/10.1016/j.jcis.2010.01.087.

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19

Erdem, Sezer, Beyhan Erdem, and Ramis Mustafa Öksüzoğlu. "Magnetic Nano-Sized Solid Acid Catalyst Bearing Sulfonic Acid Groups for Biodiesel Synthesis." Open Chemistry 16, no. 1 (October 22, 2018): 923–29. http://dx.doi.org/10.1515/chem-2018-0092.

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AbstractIn our approach for magnetic iron oxide nanoparticles surface modification, the fabrication of an inorganic shell, consisting of silica by the deposition of preformed colloids onto the nanoparticle surface and functionalization of these particles, was realized. The magnetic nanoparticles, non-coated and coated with silica layer by Stöber method, are functionalized with chlorosulfonic acid. The magnetic nanoparticles (MNPs), in size of 10-13 nm, could be used as acid catalyst in biodiesel production and show superparamagnetic character. The prepared nanoparticles were characterized by different methods including XRD, EDX, FT-IR and VSM. The catalytic activity of the coated and non-coated solid acids was examined in palmitic acid-methanol esterification as an industrial reaction for biodiesel synthesis. Although thin silica layer results in only a minor obstacle with respect to magnetism, it can accelerate the mass transportation due to its relatively porous structure and magnetic core may be more stable in the acidic reaction medium by means of covering process. Accordingly, coating strategy can be efficient way for allowing applications of MNPs in acid catalyzed esterification.

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20

Li, Cui Xia, Zhi Hong Li, Xue Yan Du, and Hai Xia Guo. "Synthesis and Magnetic Properties of FePt /Silica Core-Shell Nanoparticles." Advanced Materials Research 178 (December 2010): 291–95. http://dx.doi.org/10.4028/www.scientific.net/amr.178.291.

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FePt nanoparticles (NPS), ~2nm in diameter, were synthesized and then coated with silica (SiO2) shells ~1.5nm-thick using reverse micelles as nanoreactors. The silica-coated FePt core–shell (FePt @silica) NPS were characterized by direct techniques of transmission electron microscopy (TEM). The results showed that the silica shells prevented the aggregation in liquid comparing to their bare counterparts. The as-synthesized FePt@SiO2 NPS exhibited essential characteristics of superparamagnetic behavior, as investigated by a vibrating sample magnetometer (VSM). X-ray diffraction (XRD) studies proved that the annealing at 700 °C for 30min under argon atmosphere caused the crystal structure of FePt core to transform from disordered face centered cubic (fcc) to the chemically ordered L10 FePt with face-centered tetragonal (fct) structure. This phase transition caused the change of magnetic properties of the FePt@SiO2 particles from superparamagnetism to ferromagnetism.

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21

Tada, Dayane B., Lucas L. R. Vono, Evandro L. Duarte, Rosangela Itri, Pedro K. Kiyohara, Maurício S. Baptista, and Liane M. Rossi. "Methylene Blue-Containing Silica-Coated Magnetic Particles: A Potential Magnetic Carrier for Photodynamic Therapy." Langmuir 23, no. 15 (July 2007): 8194–99. http://dx.doi.org/10.1021/la700883y.

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22

Lai, Syu-Ming, Tsiao-Yu Tsai, Chia-Yen Hsu, Jai-Lin Tsai, Ming-Yuan Liao, and Ping-Shan Lai. "Bifunctional Silica-Coated Superparamagnetic FePt Nanoparticles for Fluorescence/MR Dual Imaging." Journal of Nanomaterials 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/631584.

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Recently, superparamagnetic chemically disordered face-centered cubic (fcc) FePt nanoparticles have been demonstrated as superior negative contrast agents for magnetic resonance imaging (MRI). However, their low intracellular labeling efficiency has limited the potential usage and the nanotoxicity of the particles requires attention. We have developed fluorescein isothiocyanate-incorporated silica-coated FePt (FePt@SiO2-FITC) nanoparticles that exhibited not only a significantT1andT2MR contrast abilities but also a fluorescent property without significant cytotoxicities. These results suggest that silica-coated superparamagnetic FePt nanoparticles are potential nanodevices for the combination of fluorescence and MRI contrast used for cancer diagnosis.

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23

Park, Sang-Yul, Hyo-Sun Kim, Jeseung Yoo, and Young-Soo Seo. "Fabrication of Hollow Silica Particles Using a Self-Assembled Polyethylene Granule as a Template." Journal of Nanomaterials 2018 (June 4, 2018): 1–9. http://dx.doi.org/10.1155/2018/4979260.

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We developed a novel method preparing nonspherical hollow silica particles (HSP) using a micron-sized granule self-assembled from partially oxidized PE wax. The morphology of the granule was closely investigated in terms of concentration and acid value of PE wax and cooling rate. Due to the oxidized unit in PE wax, magnetic nanoparticle was incorporated into the granule during the self-assembly, and silica was coated on the granule surface via the self-assembly. Silica-coating condition was studied by varying water content and reaction time. After the PE wax was removed by calcination, nonspherical HSP or magnetic HSP was obtained. This cost-effective HSP is expected to be useful for practical applications.

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24

Hong, Kwang Pyo, Ki Hyeok Song, Myeong Woo Cho, Seung Hyuk Kwon, and Hyoung Jin Choi. "Magnetorheological properties and polishing characteristics of silica-coated carbonyl iron magnetorheological fluid." Journal of Intelligent Material Systems and Structures 29, no. 1 (October 16, 2017): 137–46. http://dx.doi.org/10.1177/1045389x17730912.

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While magnetorheological fluids can be used for ultra-precise polishing, for example, of advanced optical components, oxidation of metallic particles in water-based magnetorheological fluids causes irregular polishing behavior. In this study, carbonyl iron microspheres were initially coated with silica to prevent oxidation and were used to polish BK7 glass. In addition, their rheological and sedimentation characterizations were investigated. Material removal and surface roughness were analyzed to investigate the surface quality and optimal experimental conditions of polishing wheel speed and magnetic field intensity. The maximum material removal was 0.95 µm at 95.52 kA/m magnetic field intensity and 1854 mm/s wheel speed. A very fine surface roughness of 0.87 nm was achieved using the silica-coated magnetorheological fluid at 47.76 kA/m magnetic field intensity and 1854 mm/s wheel speed.

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25

Kostiv, Uliana, Lenka Rajsiglová, Dominika Luptáková, Tomáš Pluháček, Luca Vannucci, Vladimír Havlíček, Hana Engstová, et al. "Biodistribution of upconversion/magnetic silica-coated NaGdF4:Yb3+/Er3+ nanoparticles in mouse models." RSC Advances 7, no. 73 (2017): 45997–6006. http://dx.doi.org/10.1039/c7ra08712h.

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Upconversion magnetic nanoparticles emit visible light after NIR irradiation. Gd renders them with MRI contrast. Localization of the particles is excellently visible in blood vasculature of tumor bearing mice after intravenous administration.

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26

Tabarzad, Maryam, Zeinab Sharafi, and Jaber Javidi. "Covalent immobilization of coagulation factor VIII on magnetic nanoparticles for aptamer development." Journal of Applied Biomaterials & Functional Materials 16, no. 3 (April 2, 2018): 161–70. http://dx.doi.org/10.1177/2280800018765046.

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Introduction: Magnetic nanoparticles (MNPs) are one of the most useful particulate systems in analytical applications such as specific aptamer selection. Proteins are the most noted targets of aptamer selection. Generally, covalently immobilized protein coated MNPs are more stable structures. Methods: In this study, coagulation factor VIII (FVIII) was immobilized on MNPs. A silica coating provided isocyanate functional groups was considered to interact covalently with reactive groups of the protein, resulting in a stable protein immobilization. The reactions was run in dried toluene. At end, these MNPs were applied for affinity determination of a previously selected FVIII specific aptamers. Results: Immobilization of 1 mg FVIII (~ 3 nmol) on 5 mg particles was achieved with no significant particle aggregation. Using a fluorescence-based method, affinity measurement resulted in a calculated dissociation constant of 120 ± 5.6 nM for the FVIII-specific aptamer to the FVIII-coated MNPs. Conclusion: The final product could be a suitable protein-coated solid support for magnetic-based aptamer selection processes.

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27

Huang, Dan Dan, Zhao Dai, Kun Yang, and Yuan Yuan Chu. "Preparation and Characterization of Gold-Loaded Magnetite/Silica Core-Shell Composites." Journal of Nano Research 42 (July 2016): 47–52. http://dx.doi.org/10.4028/www.scientific.net/jnanor.42.47.

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The fabrication of gold-loaded magnetite/silica core-shell particles was presented in this paper. First, 250 nm of magnetic Fe3O4 nanoparticles were prepared by solvothermal reaction. Then, the Fe3O4 particles were coated by SiO2, and Au nanoparticles (AuNPs), respectively. The core-shell structure of these microspheres was confirmed by transmission electron microscopy (TEM) and Power X-ray diffraction (XRD). The magnetic property of the core-shell microspheres was investigated at room temperature. The results indicated that the core-shell composites had a well-retained high magnetic intensity, thus it can be easily separated from the mixture in less than a few minutes by simply using a magnet.

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28

Shchukin, D. G., D. V. Sviridov, and A. I. Kulak. "Magnetorheological photocatalytic systems." International Journal of Photoenergy 1, no. 2 (1999): 65–67. http://dx.doi.org/10.1155/s1110662x99000124.

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Preparation and properties of a novel photocatalytic system containing magnetic cores coated with subsequently applied silica and titania shells are discussed. The underlying idea is to impart magnetic properties to the semiconductor particles that permits to control the rheological properties of the photocatalyst dispersion and makes possible its separation from treated solution without invoking procedures of filtration or centrifugation. Preparation route yielding photoactive titania coating and silica interlayer, which prevents the undesirable doping of catalyst and parasitic charge exchange between titania shell and magnetic core, is described in detail.

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29

Trlica, Jan, Petr Sáha, Otakar Quadrat, and Jaroslav Stejskal. "Electrorheology of polyaniline-coated silica particles in silicone oil." Journal of Physics D: Applied Physics 33, no. 15 (July 24, 2000): 1773–80. http://dx.doi.org/10.1088/0022-3727/33/15/304.

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30

Ehi-Eromosele, Cyril O., J. A. O. Olugbuyiro, A. Edobor-Osoh, A. A. Adebisi, O. A. Bamgboye, and J. Ojeifo. "Magneto-Structural and Antimicrobial Properties of Sodium Doped Lanthanum Manganite Magnetic Nanoparticles for Biomedical Applications: Influence of Silica Coating." Journal of Biomimetics, Biomaterials and Biomedical Engineering 37 (June 2018): 117–27. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.37.117.

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Coating of magnetic nanoparticles (MNPs) is usually a requirement prior to their utilization in biomedical applications. However, coating can influence the magneto-structural properties of MNPs thereby imparting their applications. The present work highlights the combustion synthesis of Na-doped lanthanum manganites (LNMO) and the influence of silica coatings on the magneto-structural properties, colloidal stability and antimicrobial properties of LNMO MNPs with their biomedical applications in mind. The crystalline perovskite structure was the same both for the bare and silica coated LNMO samples while there was a slight increase in crystallite size after coating. The FTIR spectral analysis, reduction in agglomeration of the particles and the elemental composition of the coated nanoparticles confirmed the presence of silica. The magnetization values of 34 emu/g and 29 emu/g recorded for bare and coated LNMO samples, respectively show that LNMO MNPs retained its ferromagnetic behaviour after silica coating. The pH dependent zeta potentials of the coated sample is-22.20 mV at pH 7.4 (physiological pH) and-18 mV at pH 5.0 (cell endosomal pH). Generally, silica coating reduced the antibacterial activity of the sample except forBacillussppwhere the antibacterial activity was the same with the bare sample. These results showed that while silica coating had marginal effect on the crystalline structure, size and magnetization of LNMO MNPs, it reduced the antibacterial activity of LNMO MNPs and enhanced greatly the colloidal stability of LNMO nanoparticles. Keywords: Na-doped lanthanum manganites, Silica coating, magnetic nanoparticles, biomedical applications, antimicrobial properties, colloidal stability

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31

Li, Guo Jun, Yun Hui Mei, and Feng Hou. "SiO₂-Coated Fe-Ni Alloy Core–Shell Structures Synthesized by a Facile Chemical Method." Key Engineering Materials 697 (July 2016): 303–6. http://dx.doi.org/10.4028/www.scientific.net/kem.697.303.

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Fe-Ni@ SiO2core–shell structured micrometer spherical particles with nanometer thick SiO2 shell were fabricated by a facile wet chemical process, their compositions and mechanisms were investigated using x-ray diffraction and Fourier transform of infra-red spectra, and their microstructures and magnetic properties were analyzed by high-resolution transmission electron microscopy and vibrating sample magnetometer. The structure of the synthesized SiO2-coated Fe-Ni alloy particles varied with adding TEOS contents. As-prepared Fe-Ni@SiO2 composites exhibit typical soft magnetic properties. Their highest saturation magnetization approximately linear decreases from 176 emu g−1for pure Fe-Ni alloy powders to 121 emu g−1for the coated powders with 20nm amorphous silica layers, but the coercivity of all different thickness SiO2-coated Fe-Ni alloy powders maintains in the range of about 25 Oe.

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32

Mamun, Md Al, K. M. Jalal Uddin Rumi, Harinarayan Das, and S. Manjura Hoque. "Synthesis, Properties and Applications of Silica-Coated Magnetite Nanoparticles: A Review." Nano 16, no. 04 (April 2021): 2130005. http://dx.doi.org/10.1142/s179329202130005x.

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Silica-Coated Magnetite nanoparticles (SMNP) recently gained much attractions in biomedical, environmental, construction and nuclear applications. SMNP can overcome the limitations of bare magnetic iron oxide nanoparticles (MNP) such as agglomeration, dissolution and leaching in aqueous and biological system. Silica coating protects the MNP core as well as provides excellent biocompatibility, chemical and thermal stability with higher adsorption capacity of heavy metals and radionuclides. SMNPs are mostly prepared by Modified Stöber method as the simplest route although surface pretreatment or surface modification is needed to avoid formation of large aggregates. Microemulsion method gives excellent size and shape control but needs large quantity of surfactants and solvents. Sonochemical approach provides faster hydrolysis and can prevent agglomeration without any surface pretreatment. Optimal silica coating thickness can provide uniform particles distribution, enough superparamagnetic properties for easy magnetic separation, chemical and thermal stability. Keeping in mind the wide interest in SMNP, this review is designed to report the important information on synthesis, properties and potential applications of SMNP.

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Wang, Zhifei, Yafei Guo, Song Li, Yueming Sun, and Nongyue He. "Synthesis and Characterization of SiO2/(PMMA/Fe3O4) Magnetic Nanocomposites." Journal of Nanoscience and Nanotechnology 8, no. 4 (April 1, 2008): 1797–802. http://dx.doi.org/10.1166/jnn.2008.18245.

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Magnetic silica nanocomposites (magnetic nanoparticles core coated by silica shell) have the wide promising applications in the biomedical field and usually been prepared based on the famous Stöber process. However, the flocculation of Fe3O4 nanoparticles easily occurs during the silica coating, which limits the amount of magnetic silica particles produced in the Stöber process. In this paper, PMMA/Fe3O4 nanoparticles were used in the Stöber process instead of the “nude” Fe3O4 nanoparticles. And coating Fe3O4 with PMMA polymer beforehand can prevent magnetic nanoparticles from the aggregation that usually comes from the increasing of ionic strength during the hydrolyzation of tetraethoxysilane (TEOS) by the steric hindrance. The results show that the critical concentration of magnetic nanoparticles can increase from 12 mg/L for “nude” Fe3O4 nanoparticles to 3 g/L for PMMA/Fe3O4 nanoparticles during the Stöber process. And before the deposition of silica shell, the surface of PMMA/Fe3O4 nanoparticles had to be further modified by hydrolyzing them in CH3OH/NH3˙H2O mixture solution, which provides the carboxyl groups on their surface to react further with the silanol groups of silicic acid.

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Zhang, Hong Yan, Jun Wang, and Shao Hua Fan. "Bifunctional Fe₃O₄@SiO₂@Eu-Polyoxometalates Nanoparticles and Study on their Magnetism and Luminescence." Advanced Materials Research 284-286 (July 2011): 2224–29. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.2224.

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In this paper, we report the synthesis of the bifunctional Fe3O4@SiO2@Eu-polyoxometalates particles. The magnetite nanoparticles (Fe3O4) homogeneously coated with silica spheres prepared with the Stöber method. The so-obtained Fe3O4@SiO2 core/shell particles were modified by 3-aminopropyltriethoxysilane and finally grafted with the luminescent Europium -polyoxometalates. The core-shell particles were characterized by scanning electron microscopy, transmission electron microscopy, FT-IR, UV, magnetism and luminescence spectroscopy. The results indicated that the core-shell particles show both interesting luminescence and magnetic properties.

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Haufová, Petra, Zdeněk Knejzlík, Jaroslav Hanuš, Aleš Zadražil, and František Štěpánek. "Reversible buckling and diffusion properties of silica-coated hydrogel particles." Journal of Colloid and Interface Science 357, no. 1 (May 2011): 109–15. http://dx.doi.org/10.1016/j.jcis.2011.01.106.

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BAERT, KASPER, WIM LIBAERS, BRANKO KOLARIC, RENAUD A. L. VALLÉE, MARK VAN DER AUWERAER, KOEN CLAYS, DIDIER GRANDJEAN, MARCEL DI VECE, and PETER LIEVENS. "DEVELOPMENT OF MAGNETIC MATERIALS FOR PHOTONIC APPLICATIONS." Journal of Nonlinear Optical Physics & Materials 16, no. 03 (September 2007): 281–94. http://dx.doi.org/10.1142/s0218863507003779.

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In this manuscript, the synthesis and characterization of superparamagnetic particles and their silica-coated counterparts as building blocks for magnetic photonic crystals is fully described. The advantages and disadvantages of the presented synthetic method are discussed. Preliminary results considering the presence of magnetic species within a photonic crystal are also presented. Suppression of emission of the quantum dots within photonic crystals is attributed to a decrease of the number of available photonic modes for radiative decay. The presence of materials with permanent magnetic moments within photonic crystals shows that suppression of their emission is scaled with the strength of the magnetic field.

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Shin, Ju-Yeon, Yeong-Ri Jung, Sung-Jin Kim, and Sang-Gi Lee. "Supported Pd Nanocatalysts onto Ionic Silica-Coated Magnetic Particles for Catalysis in Ionic Liquids." Bulletin of the Korean Chemical Society 32, spc8 (August 20, 2011): 3105–8. http://dx.doi.org/10.5012/bkcs.2011.32.8.3105.

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Heitsch, Andrew T., Danielle K. Smith, Reken N. Patel, David Ress, and Brian A. Korgel. "Multifunctional particles: Magnetic nanocrystals and gold nanorods coated with fluorescent dye-doped silica shells." Journal of Solid State Chemistry 181, no. 7 (July 2008): 1590–99. http://dx.doi.org/10.1016/j.jssc.2008.05.002.

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Agustín-Serrano, R., F. Donado, and E. Rubio-Rosas. "Magnetorheological fluid based on submicrometric silica-coated magnetite particles under an oscillatory magnetic field." Journal of Magnetism and Magnetic Materials 335 (June 2013): 149–58. http://dx.doi.org/10.1016/j.jmmm.2013.02.017.

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Bedford, Erin E., Christophe Méthivier, Claire-Marie Pradier, Frank Gu, and Souhir Boujday. "Nanostructured and Spiky Gold Shell Growth on Magnetic Particles for SERS Applications." Nanomaterials 10, no. 11 (October 27, 2020): 2136. http://dx.doi.org/10.3390/nano10112136.

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Multifunctional micro- and nanoparticles have potential uses in advanced detection methods, such as the combined separation and detection of biomolecules. Combining multiple tasks is possible but requires the specific tailoring of these particles during synthesis or further functionalization. Here, we synthesized nanostructured gold shells on magnetic particle cores and demonstrated the use of them in surface-enhanced Raman scattering (SERS). To grow the gold shells, gold seeds were bound to silica-coated iron oxide aggregate particles. We explored different functional groups on the surface to achieve different interactions with gold seeds. Then, we used an aqueous cetyltrimethylammonium bromide (CTAB)-based strategy to grow the seeds into spikes. We investigated the influence of the surface chemistry on seed attachment and on further growth of spikes. We also explored different experimental conditions to achieve either spiky or bumpy plasmonic structures on the particles. We demonstrated that the particles showed SERS enhancement of a model Raman probe molecule, 2-mercaptopyrimidine, on the order of 104. We also investigated the impact of gold shell morphology—spiky or bumpy—on SERS enhancements and on particle stability over time. We found that spiky shells lead to greater enhancements, however their high aspect ratio structures are less stable and morphological changes occur more quickly than observed with bumpy shells.

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Zarei, Mohsen, Azar Shahpiri, Parvaneh Esmaeilnejad-Ahranjani, and Ayyoob Arpanaei. "Metallothionein-immobilized silica-coated magnetic particles as a novel nanobiohybrid adsorbent for highly efficient removal of cadmium from aqueous solutions." RSC Advances 6, no. 52 (2016): 46785–93. http://dx.doi.org/10.1039/c6ra05210j.

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In this contribution, magnetic nanocomposite particles of Fe₃O₄ cluster@SiO₂ (MNPs) were functionalized with N-(2-aminoethyl)-3-aminopropyltrimethoxy-silane (EDS) to obtain amine-functionalized magnetic nanocomposite particles (AF-MNPs).

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42

Nguyen-Le, Minh-Tri, Dinh Tien Dung Nguyen, Sophia Rich, Ngoc Tram Nguyen, Cuu Khoa Nguyen, and Dai Hai Nguyen. "SYNTHESIS AND CHARACTERIZATION OF SILICA COATED MAGNETIC IRON OXIDE NANOPARTICLES." Vietnam Journal of Science and Technology 57, no. 3A (October 28, 2019): 160. http://dx.doi.org/10.15625/2525-2518/57/3a/14203.

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Advances in nanotechnology in recent years has led to a number of diverse applications of nanomaterials. Magnetic iron oxide nanoparticles (Fe3O4 NPs), a representative of magnetic nanomaterials, has gained much attention of many researchers all over the world due to their unique properties such as superparamagnetism, biocompatibility and high magnetic saturation. With such properties, Fe3O4 NPs can be exploited in many fields, particularly biomedicine related fields such as cellular therapy, tissue repair, drug delivery, magnetic resonance imaging, hyperthermia and magnetofection. However, owing to their self-aggregation of Fe3O4 NPs, it is necessary to coat Fe3O4 NPs with a stable and biocompatible silica layer. Therefore, in this report, Fe3O4 NPs were synthesized via a co-precipitation method using iron (II)/ iron (III) chloride, ammonia and trisodium citrate. Then, the silica layer was coated onto Fe3O4 NPs through the hydrolysis and condensation of tetraethyl orthosilicate (TEOS) in ethanol. The as-synthesized samples were charaterized with the infrared (IR) spectroscopy, X-ray diffraction (XRD) spectroscopy, thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM) and dynamic light scattering (DLS). The results proved that silica was successfully coated on Fe3O4 NPs. The particle sizes measured by TEM were found to be about 12 nm in diameter for Fe3O4 NPs and 45 nm in diameter for silica coated Fe3O4 (SiO2@Fe3O4) NPs, while the dynamic diameters measured by DLS for Fe3O4 NPs and SiO2@Fe3O4 NPs were 15.7 and 65.8 nm, respectively. Both Fe3O4 NPs and SiO2@Fe3O4 NPs were superparamagnetic materials in which Fe3O4 NPs have higher magnetic saturation (45.8 emu/g) than the other (13.4 emu/g).This study examines the: ……...Advances in nanotechnology in recent years has led to a number of diverse applications of nanomaterials. Magnetic iron oxide nanoparticles (Fe3O4 NPs), a representative of magnetic nanomaterials, has gained much attention of many researchers all over the world due to their unique properties such as superparamagnetism, biocompatibility and high magnetic saturation. With such properties, Fe3O4 NPs can be exploited in many fields, particularly biomedicine related fields such as cellular therapy, tissue repair, drug delivery, magnetic resonance imaging, hyperthermia and magnetofection. However, owing to their self-aggregation of Fe3O4 NPs, it is necessary to coat Fe3O4 NPs with a stable and biocompatible silica layer. Therefore, in this report, Fe3O4 NPs were synthesized via a co-precipitation method using iron (II)/ iron (III) chloride, ammonia and trisodium citrate. Then, the silica layer was coated onto Fe3O4 NPs through the hydrolysis and condensation of tetraethyl orthosilicate (TEOS) in ethanol. The as-synthesized samples were charaterized with the infrared (IR) spectroscopy, X-ray diffraction (XRD) spectroscopy, thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM) and dynamic light scattering (DLS). The results proved that silica was successfully coated on Fe3O4 NPs. The particle sizes measured by TEM were found to be about 12 nm in diameter for Fe3O4 NPs and 45 nm in diameter for silica coated Fe3O4 (SiO2@Fe3O4) NPs, while the dynamic diameters measured by DLS for Fe3O4 NPs and SiO2@Fe3O4 NPs were 15.7 and 65.8 nm, respectively. Both Fe3O4 NPs and SiO2@Fe3O4 NPs were superparamagnetic materials in which Fe3O4 NPs have higher magnetic saturation (45.8 emu/g) than the other (13.4 emu/g).

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Taher, Zainab, Christopher Legge, Natalie Winder, Pawel Lysyganicz, Andrea Rawlings, Helen Bryant, Munitta Muthana, and Sarah Staniland. "Magnetosomes and Magnetosome Mimics: Preparation, Cancer Cell Uptake and Functionalization for Future Cancer Therapies." Pharmaceutics 13, no. 3 (March 10, 2021): 367. http://dx.doi.org/10.3390/pharmaceutics13030367.

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Magnetic magnetite nanoparticles (MNP) are heralded as model vehicles for nanomedicine, particularly cancer therapeutics. However, there are many methods of synthesizing different sized and coated MNP, which may affect their performance as nanomedicines. Magnetosomes are naturally occurring, lipid-coated MNP that exhibit exceptional hyperthermic heating, but their properties, cancer cell uptake and toxicity have yet to be compared to other MNP. Magnetosomes can be mimicked by coating MNP in either amphiphilic oleic acid or silica. In this study, magnetosomes are directly compared to control MNP, biomimetic oleic acid and silica coated MNP of varying sizes. MNP are characterized and compared with respect to size, magnetism, and surface properties. Small (8 ± 1.6 nm) and larger (32 ± 9.9 nm) MNP are produced by two different methods and coated with either silica or oleic acid, increasing the size and the size dispersity of the MNP. The coated larger MNP are comparable in size (49 ± 12.5 nm and 61 ± 18.2 nm) to magnetosomes (46 ± 11.8 nm) making good magnetosome mimics. All MNP are assessed and compared for cancer cell uptake in MDA-MB-231 cells and importantly, all are readily taken up with minimal toxic effect. Silica coated MNP show the most uptake with greater than 60% cell uptake at the highest concentration, and magnetosomes showing the least with less than 40% at the highest concentration, while size does not have a significant effect on uptake. Finally, surface functionalization is demonstrated for magnetosomes and silica coated MNP using biotinylation and EDC-NHS, respectively, to conjugate fluorescent probes. The modified particles are visualized in MDA-MB-231 cells and demonstrate how both naturally biosynthesized magnetosomes and biomimetic silica coated MNP can be functionalized and readily up taken by cancer cells for realization as nanomedical vehicles.

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Silva, Maria C., Juliana A. Torres, Francisco G. E. Nogueira, Tássia S. Tavares, Angelita D. Corrêa, Luiz C. A. Oliveira, and Teodorico C. Ramalho. "Immobilization of soybean peroxidase on silica-coated magnetic particles: a magnetically recoverable biocatalyst for pollutant removal." RSC Advances 6, no. 87 (2016): 83856–63. http://dx.doi.org/10.1039/c6ra17167b.

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Hamada, Takeyuki, Hiroyuki Izumi, Tatsuya Makino, and Toshinori Makuta. "Fabrication of silica-coated hollow particles by using ultrasonically generated microbubbles." Microsystem Technologies 24, no. 1 (March 30, 2017): 733–37. http://dx.doi.org/10.1007/s00542-017-3387-8.

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46

Dejesus, M. C., D. S. Rimai, E. Stelter, T. N. Tombs, and D. S. Weiss. "Adhesion of Silica-Coated Toner Particles to Bisphenol-A Polycarbonate Films." Journal of Imaging Science and Technology 52, no. 1 (2008): 010503. http://dx.doi.org/10.2352/j.imagingsci.technol.(2008)52:1(010503).

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Hossain, Taslima, Mohammad A. Alam, Mohammad A. Rahman, Mostafa K. Sharafat, Hideto Minami, Muhammad A. Gafur, Sheikh M. Hoque, and Hasan Ahmad. "Zwitterionic poly(2-(methacryloyloxy) ethyl phosphorylcholine) coated mesoporous silica particles and doping with magnetic nanoparticles." Colloids and Surfaces A: Physicochemical and Engineering Aspects 555 (October 2018): 80–87. http://dx.doi.org/10.1016/j.colsurfa.2018.06.020.

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Dong, Jie, Zhenghe Xu, and Feng Wang. "Engineering and characterization of mesoporous silica-coated magnetic particles for mercury removal from industrial effluents." Applied Surface Science 254, no. 11 (March 2008): 3522–30. http://dx.doi.org/10.1016/j.apsusc.2007.11.048.

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Quy, Dao Van, Nguyen Minh Hieu, Pham Thi Tra, Nguyen Hoang Nam, Nguyen Hoang Hai, Nguyen Thai Son, Phan Tuan Nghia, Nguyen Thi Van Anh, Tran Thi Hong, and Nguyen Hoang Luong. "Synthesis of Silica-Coated Magnetic Nanoparticles and Application in the Detection of Pathogenic Viruses." Journal of Nanomaterials 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/603940.

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Magnetic Fe3O4nanoparticles were prepared by coprecipitation and then coated with silica. These Fe3O4/SiO2nanoparticles consisted of a 10–15 nm magnetic core and a silica shell of 2–5 nm thickness. The superparamagnetic property of the Fe3O4/SiO2particles with the magnetization of 42.5 emu/g was confirmed by vibrating sample magnetometer (VSM). We further optimized buffers with these Fe3O4/SiO2nanoparticles to isolate genomic DNA of hepatitis virus type B (HBV) and of Epstein-Barr virus (EBV) for detection of the viruses based on polymerase chain reaction (PCR) amplification of a 434 bp fragment ofSgene specific for HBV and 250 bp fragment of nuclear antigen encoding gene specific for EBV. The purification efficiency of DNA of both HBV and EBV using obtained Fe3O4/SiO2nanoparticles was superior to that obtained with commercialized Fe3O4/SiO2microparticles, as indicated by (i) brighter PCR-amplified bands for both HBV and EBV and (ii) higher sensitivity in PCR-based detection of EBV load (copies/mL). The time required for DNA isolation using Fe3O4/SiO2nanoparticles was significantly reduced as the particles were attracted to magnets more quickly (15–20 s) than the commercialized microparticles (2-3 min).

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Ohmori, Masahiro, and Egon Matijević. "Preparation and properties of uniform coated colloidal particles. VII. Silica on hematite." Journal of Colloid and Interface Science 150, no. 2 (May 1992): 594–98. http://dx.doi.org/10.1016/0021-9797(92)90229-f.

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