Relevant bibliographies by topics / Silica coated magnetic particles

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Silica coated magnetic particles'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Silica coated magnetic particles"

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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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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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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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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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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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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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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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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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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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Dissertations / Theses on the topic "Silica coated magnetic particles"

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Li, Dan Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "Designing functional magnetic nanoparticles with flame spray pyrolysis for bio-applications." Publisher:University of New South Wales. Chemical Sciences & Engineering, 2009. http://handle.unsw.edu.au/1959.4/43346.

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Magnetic nanoparticles (MNPs) hold great promise in the fields of biology and medicine. The synthesis of functional MNPs with precisely controlled crystallographic, physicochemical, and magnetic properties on a large scale still remains the challenge today. This thesis reports the exploration of liquid-fed flame spray pyrolysis (FSP) in the synthesis of functional MNPs, their surface modifications, and potential bio-applications. Superparamagnetic and ferromagnetic maghemite (γ-Fe2O3) nanoparticles, and silica-coated maghemite (SiO2/γ-Fe2O3) nanocomposites were synthesised using FSP. The size of γ-Fe2O3 was controllable from 6 to 53 nm, with morphology evolving from a disordered near-spherical shape to fully ordered 2-D hexagonal/octagonal platelet. The saturation magnetisation (Ms) increased from 21 to 74 emu/g with increasing particle size, up to 13 nm when Ms approached the bulk γ-Fe2O3 characteristics. In the case of SiO2/γ-Fe2O3, three distinct morphologies, namely the single segregated γ-Fe2O3 core- SiO2 shell, transitional mixed morphologies, and multi γ-Fe2O3 cores embedded in submicron SiO2 shell, were obtained. The core size, composite size, and morphology of γ- Fe2O3 were tunable by varying %SiO2 loading and the use of a quartz tube enclosure during flame synthesis. The magnetic behaviour correlated well with the crystal microstructure. Following the core particle design, protein adsorption-desorption behaviour on FSP-madeMNPs was studied. Bovine serum albumin (BSA) adsorption was found to follow the Langmuir isotherm, with high binding capacities (150−348 mg BSA/g particle) and fast association constants. Electrostatically governed BSA orientations were proposed for different particle-buffer systems. The adsorbed BSA was effectively recovered by pH-shift using K2HPO4. Subsequently, terminal amine, aldehyde, carboxylic, epoxy, mercapto and maleimide functionality were anchored onto the FSP-made γ-Fe2O3 particles. These versatile functional groups led to conjugation of active trypsin. The immobilised trypsin exhibited superior durability with >60% residual activity after one week, and excellent reusability for >5 cycles. The trypsin-conjugated MNPs are promising carriers in proteomics, demonstrating good substrate specificity with equivalent or better sequence coverage compared to free trypsin in insulin and BSA digestion. In another application, a refined silanisation procedure simultaneously reduced γ-Fe2O3 to Fe3O4, and generated thiol enriched surface for matrix metalloproteinase-2 (MMP-2) conjugation. The highly active MMP-2-conjugated MNPs could potentially enhance the interstitial transport of macromolecule/nanoparticles in drug delivery.
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Ronhovde, Cicily J. "Biomedical applications of mesoporous silica particles." Diss., University of Iowa, 2017. https://ir.uiowa.edu/etd/5837.

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Mesoporous silica particles are of significant interest for biomedical applications due to their good general biocompatibility compared to other nanoparticle matrices such as quantum dots, high specific surface areas up to 1000 m2/g, and extreme synthetic tunability in terms of particle size, pore size and topology, core material, and surface functionalization. For one application, drug delivery, mesoporous silica nanoparticles (MSNs) of two pore structures, MCM-41 – parallel, hexagonally ordered pores approximately 3 nm in diameter – and wormhole (WO) – interconnected, disordered pores also approximately 3 nm in diameter – were synthesized with particle diameters under 100 nm. Additionally, a magnetic Fe3O4 nanoparticle core was incorporated into Fe3O4-core WO-MS-shell particles. The particles were loaded with doxorubicin, a chemotherapeutic, and the drug release into phosphate buffered saline (PBS, 10 mM, pH 7.4) at 37 °C was monitored by fluorescence spectroscopy. The data were fit to three models: Korsmeyer-Peppas, first order exponential release, and Weibull. The Korsmeyer-Peppas model provided useful information concerning the kinetics and mechanism of drug release from each MSN type. A small but statistically significant difference in the release kinetics was found due to the different pore topologies. A much larger kinetic effect was observed due to the inclusion of an iron oxide core. Applying a static magnetic field to the Fe3O4-core WO-MS shell particles did not have a significant impact on the doxorubicin release. This is the first time that the effects of pore topology and iron oxide core have been isolated from pore diameter and particle size for these materials. In vitro cell studies were conducted to determine the cytotoxicity of the bare and doxorubicin-loaded materials against three cancerous cell lines – A549 human lung carcinoma cells, HEC50CO human endometrial cancer cells, and CT26 mouse colon cancer cells. The MCM-41 and WO MSNs generally displayed similar toxicities within each cell line, and the Fe3O4-core WO-MS shell particles were less toxic. Doxorubicin-loaded particles generally displayed greater toxicity than bare MSNs, but the A549 cells were very resistant to all concentrations of MSNs tested. For another biomedical application, tissue phantom development, mesoporous silica particles with approximately 10 μm diameters and C18 surface functionalization were evaluated for their use as a substrate for optical tissue phantoms. Tissue phantoms are synthetic imitations of biological material, and C18-modified silica provides a substrate that is simple to load with optically active biological molecules. The molecules are then hydrophobically trapped to maintain a clear optical boundary between the biological loading within the particle and an aqueous suspension gel. Several preparation techniques were evaluated for the dispersal of hydrophobic particles in aqueous media, and qualitative analysis indicated that surfactant coating of the outer surface could fully disperse the hydrophobic particle while maintaining the clear optical boundary. A novel analysis was developed to provide a single numerical indicator of clustering for a quantitative assessment of particle dispersal in tissue phantoms.
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Aygar, Gulfem. "Preparation Of Silica Coated Cobalt Ferrite Magnetic Nanoparticles For The Purification Of Histidine-tagged Proteins." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613894/index.pdf.

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The magnetic separation approach has several advantages compared with conventional separation methods
it can be performed directly in crude samples containing suspended solid materials without pretreatment, and can easily isolate some biomolecules from aqueous systems in the presence of magnetic gradient fields. This thesis focused on the development of new class of magnetic separation material particularly useful for the separation of histidine-tagged proteins from the complex matrixes through the use of imidazole side chains of histidine molecules. For that reason surface modified cobalt ferrite nanoparticles which contain Ni-NTA affinity group were synthesized. Firstly, cobalt ferrite nanoparticles with a narrow size distribution were prepared in aqueous solution using the controlled coprecipitation method. In order to obtain small size of agglomerates two different dispersants, oleic acid and sodium chloride, were tried. After obtaining the best dispersant and optimum experimental conditions, ultrasonic bath was used in order to decrease the size of agglomerates. Then, they were coated with silica and this was followed by surface modification of these nanoparticles by amine in order to add functional groups on silica shell. Next, &ndash
COOH functional groups were added to silica coated cobalt ferrite magnetic nanoparticles through the NH2 groups. After that N&alpha
,N&alpha
-Bis(carboxymethyl)-L-lysine hydrate, NTA, was attached to carboxyl side of the structure. Finally, nanoparticles were labeled with Ni (II) ions. The size of the magnetic nanoparticles and their agglomerates were determined by FE-SEM images, particle size analyzer, and zeta potential analyzer (zeta-sizer). Vibrational sample magnetometer (VSM) was used to measure the magnetic behavior of cobalt ferrite and silica coated cobalt ferrite magnetic nanoparticles. Surface modifications of magnetic nanoparticles were followed by FT-IR measurements. ICP-OES was used to find the amount of Ni (II) ion concentration that was attached to the magnetic nanoparticle.
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Bagherzadeh, Hosseini Seyyed Alireza. "Kinetic study of methane hydrate formation in a bed of silica sand particles using magnetic resonance imaging." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/26269.

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This thesis studies the formation and decomposition of methane hydrate crystal in an unconsolidated bed of silica sand particles. Hydrate processes were visualized by taking advantage of the ¹H magnetic resonance imaging technique, and the integrated intensity of magnetic resonance images was used to quantify the rate and kinetics. For all of the experiments, the initial pressure was 8 MPa and the temperature was kept constant at 1℃. Beds composed of 2 grams of sand were saturated with different amounts of water (0.44, 0.33, 0.22 and 0.11 mL) in order to examine the effect of water content of the bed on the kinetics of hydrate formation in porous media. Also, the effect of particle size was investigated by forming hydrate in beds with different particle size ranges (210-297, 125-210, 88-177 and <74 µm). It was found that the hydrate formation process in a bed of silica sand particles can be divided into three stages: induction time, non-uniform growth and uniform growth. During the first stage, methane molecules dissolved and diffused in water. After formation of the first crystals of hydrate at the end of the induction period (nucleation point), hydrate formation proceeded through a combination and competition between nucleation and growth, and multiple nucleation occurred. During the last stage, no obvious nucleation was observed and hydrate formation continued only through the growth of the crystals which had already been formed during the previous stages. The rate of hydrate formation was found to be faster in beds with smaller particles and lower water content.
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Feldmann, Verena [Verfasser], and Hermann A. [Akademischer Betreuer] Mayer. "Multifunctional Silica Particles as Contrast Agents for Optical and Magnetic Resonance Imaging / Verena Feldmann ; Betreuer: Hermann A. Mayer." Tübingen : Universitätsbibliothek Tübingen, 2011. http://d-nb.info/1162699272/34.

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Singhon, Rattiya. "Adsorption of Cu(II) and Ni(II) Ions on Functionalized Colloidal Silica Particles Model Studies for Wastewater Treatment." Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2077/document.

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Ce doctorat porte sur la fonctionnalisation de silices colloïdales en vue de la rétention de micropolluants métalliques dans des effluents. Les nanoparticules et microparticules ouvrent des potentialités d’application dans de nombreux secteurs industriels (chimie, environnement, pharmacie...). Ainsi, ces travaux de recherche portent sur la synthèse et la caractérisation de matériaux composites submicroniques : il s’agit de silices colloïdales sur lesquelles sont greffés des silanes ou supportés des polysaccharides. Une des applications de ces travaux de recherche porte sur l’adsorption de métaux de transition sur ces composites en solution aqueuse. Dans le cadre de ce doctorat, les caractéristiques des composites sont définies par leur morphologie de surface, par l’étude des groupements fonctionnels présents, par détermination de leurs surfaces spécifiques ainsi qu’en solution aqueuse par détermination de leurs diamètres hydrodynamiques et de leurs potentiels zéta. Dans un premier temps, la fonctionnalisation de la silice a permis le greffage de groupements carboxyliques et amines dont tes taux de greffage obtenus ont été respectivement de 0,47 µmol/m² et 3,86 µmol/m². En présence de groupements amines, le potentiel  des composites est positif jusqu’ à pH 9 alors qu’il est négatif dès pH 3 pour des silices non fonctionnalisées. Dans un second temps, la silice est supportée par du chitosane dont le degré de désacétylation est de 77%. Conjointement, l’encapsulation de la silice est réalisées par du chitosane sur lequel des fonctions carboxyliques ont été greffées. La morphologie des particules est alors modifiée, leurs diamètres hydrodynamiques sont plus élevés et leurs potentiels  sont positifs jusqu’ à pH basique. La rétention d’ions métalliques (Cu(II) et Ni(II)) par ces composites à différents pH est ensuite étudiée. Pour chacun des cations métalliques, les capacités d’adsorption sont déterminées ainsi que les cinétiques d’adsorption. L’application de plusieurs modèles d’isotherme d’équilibre a été réalisée. Dans le cas de Cu(II), à pH 5, les meilleures capacités d’adsorption sont obtenues pour des silices supportées par du chitosane greffé : la capacité de rétention des ions Cu(II) est de 270 mg/g à pH 5. De même, c’est ce composite qui permet la meilleurs rétention des ions Ni(II) à pH 7 avec une capacité d’adsorption de 263 m/g. Concernant la cinétique, le modèle de réaction de surface du pseudo-second ordre s’applique bien aux résultats expérimentaux
This study is focused on the preparation of three types of silica-based composites for the capture of Cu(II) and Ni(II) ions. The first strategy consists in coating chitosan on colloidal fumed silica after acidic treatment yielding the composite SiO2+CS. The second strategy can be separated into two routes: the first one involves surface grafting of silica with aminopropyltriethoxysilane to obtaining silica particles covered by amino groups (SiO2(NH2)). The second one involves in surface condensation of triethoxysilylbutyronitrile, followed by acidic hydrolysis of the surface-bound nitrile groups affording silica particles covered by carboxyl groups (SiO2(CO2H)). In the last step, chitosan has been grafted on the surface bound NH2 or -CO2H groups yielding the composites SiO2(NH2)+CS or SiO2(CO2H)+CS. The third strategy involves in the modified CS surface with -CO2H groups, followed by coating onto the non-modified silica nanoparticles to obtain the composite SiO2+CS(CO2H). The novel hybrid materials were characterized by IR spectroscopy, scanning electron microscopy, atomic force microscopy, and zeta potential measurements. Batch experiments were conducted to study the sorption performance of these composites for Cu(II) and Ni(II) removal from aqueous solution at optimum pH at 298 K. The kinetics were evaluated utilizing pseudo-first-order, pseudo-second-order, and intraparticle diffusion models. The adsorption kinetics followed the mechanism of the pseudo-second-order equation for all types of adsorbents. The adsorption isotherms were evaluated utilizing Langmuir, Freundlich, and Temkin models. The best interpretation for equilibrium data was given by Langmuir isotherm model. This study demonstrates that the adsorption capacities for Cu(II) ion is more efficient for the SiO2+CS (256 mg g-1) compared to SiO2(NH2) (75 mg g-1). However, the carboxyl grafted CS-coated silica (SiO2+CS(CO2H) exhibited an excellent adsorption capacity (333 mg g-1). In case of Ni(II), based on Langmuir isotherm the maximum adsorption capacity found to be 182 mg g-1for SiO2+CS, and 210 mg g-1 for SiO2(CO2H) + CS. Using single-metal solutions, these adsorbents were found to have an affinity for metal ions in order as Cu(II) > Ni(II). The adsorption of Cu(II) ion by SiO2+CS was affected by the nature of the respective anion. Application of these composite materials to remove Cu(II) and Ni(II) from aqueous solution was shown to be more efficient than the adsorption capacities of many sorbents probed by other research groups
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Krämer, Florian Benjamin [Verfasser], and Rainer [Akademischer Betreuer] Birringer. "Quantitative modeling of the magnetic field-dependent optical transmission of silica coated nickel nanorod colloids / Florian Benjamin Krämer ; Betreuer: Rainer Birringer." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2017. http://d-nb.info/1136608001/34.

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Krämer, Florian [Verfasser], and Rainer [Akademischer Betreuer] Birringer. "Quantitative modeling of the magnetic field-dependent optical transmission of silica coated nickel nanorod colloids / Florian Benjamin Krämer ; Betreuer: Rainer Birringer." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2017. http://d-nb.info/1136608001/34.

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Paolella, Maurizio. "Correlations between structural and magnetic properties in powder and bulk Mg(B1-xCx)2 prepared using carbon chemical vapour doped boron and silica coated boron." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/397082/.

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The research project has been focused on the preparation and characterization of Mg(b1-xCx)2 powder and bulk samples using chemical vapour coated boron and silica coated boron by sol-gel method. The chemical vapour deposition of carbon on boron powder was achieved by reacting ethylene gas on high purity nano-sized boron particles (20-100nm diameter) with varying deposition temperatures and partial pressures. Undoped and carbon doped boron was then reacted with magnesium rod to produce both Mg(b1-xCx)2 powder and bulk samples. Transmission electron microscopy showed that the chemical vapour deposition achieved a uniformly thick carbon-rich layer on each particle, regardless of particle size. In addition, the analusis of the diffraction peaks and the characterization of the magnetisation has evidenced the coexistence of phases with different levels of carbon resulting in multiple current paths within the Mg(B1-xCx)2 samples. The study of the preparation process for bulk Mg(B1-xCx)2 samples has evidenced that reducing the difference between the time constant of reaction and the time constant of diffusion is crucial to opbtain well-sintered samples devoid of cracks. Doping with carbon has shown significant improvements in the field dependence of K for the MG(B1-xCx)2 bulk samples reaching values comparable with the best literature-reported data for bulk samples. However, the K values of the MG(B1-xCx)2 bulk samples were observed to be noticeably lower when compared with the beszt liter4arture-reported data for wires and tapes, owing to the greater density achievable in the latter. In contrast to the carbon doping, the coating with silica via sol-gel process was found to impair the in-field Jc properties of Mg(B1-xCx)2 bulk samples, presumably due to the huge amount of silica loaded onto the boron powder and to the formation of carbonate and silicate impuritis within their reacted microstructure.
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Pirani, Parisa. "Surface-Engineered Magnetic Nanoparticles for Sample Preparation and Analysis of Proteins and Peptides." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2012.

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Sample preparation as an essential step in mass spectrometry-based analysis, plays a critical role in proteomics studies. Magnetic nanoparticles (MNPs) have been widely used in protein and peptide sample preparation due to their magnetic properties, biocompatibility, easy synthesis and surface functionalization. MNPs loaded with analyte or analyte modification reagent can be easily separated from the reaction medium by an externally applied magnetic field. The small size of MNPs provides high analyte loading and extraction capacity. Additionally, MNP can be decorated with different functional groups to achieve selective modification or extraction of analyte. In this study we have utilized silica coated iron oxide magnetic nanoparticles (Fe3O4@SiO2 MNPs) for protein and peptide sample preparation. Fluorescence-based methods were utilized for quantitative and qualitative characterization of N-hydrosucccinimidyl (NHS) ester groups on the surface of Fe3O4@SiO2 MNPs. Fluorophore Dansylcadaverine was conjugated to NHS ester functional groups. Fluorometric measurement of cleaved dansylcadaveine was employed to determine the number of NHS ester groups per MNPs that was found to be 2.6 × 102 and 3.4 × 103for 20 nm and 100 nm Fe3O4@SiO2 MNPrespectively. The efficiency of labeling native bovine serum albumin (BSA) by NHS ester coated Fe3O4@SiO2 MNPs was also explored in terms of maximizing the number of MNPs conjugated per BSA molecule or maximizing the number of BSA molecules conjugated per each MNP. Lysine residues of apolipoprotein B-100 (apoB-100) on the surface of intact human low density lipoprotein (LDL) were labeled by NHS ester modified Fe3O4@SiO2 MNPs in aqueous solvents at room temperature. The MNP labeledapoB-100 was treated by SDS to remove lipids and then digested using trypsin. Tryptic peptides were eluted from MNPs by cleaving disulfide linkage between labeled peptides and MNPs. LC-MS/MS analysis found 28 peptides containing labeled lysine residues. These lysine residues should be on the solvent exposed surface of LDL since the large size of MNPs prevents contact of the labeling reagent to those lysines embedded inside the structure of LDL. TCEP- immobilized Fe3O4@SiO2MNPs were fabricated and utilized for reduction of disulfide bonds in bovine pancreas insulin and two different cyclic peptides. Disulfide bonds were efficiently cleaved at room temperature in both organic and aqueous solvents confirmed by LC-MS/MS analysis of reduced/alkylated protein and peptides. Disulfide reduction and alkylation reactions was performed in one step and the reducing agent was simply separated from peptide and protein solution by magnetic separation.
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Books on the topic "Silica coated magnetic particles"

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Agotegaray, Mariela A., and Verónica L. Lassalle. Silica-coated Magnetic Nanoparticles. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50158-1.

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Agotegaray, Mariela A., and Verónica L. Lassalle. Silica-coated Magnetic Nanoparticles: An Insight into Targeted Drug Delivery and Toxicology. Springer, 2017.

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Book chapters on the topic "Silica coated magnetic particles"

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Sharma, Rakesh K., Manavi Yadav, and Manoj B. Gawande. "Silica-Coated Magnetic Nano-Particles: Application in Catalysis." In ACS Symposium Series, 1–38. Washington, DC: American Chemical Society, 2016. http://dx.doi.org/10.1021/bk-2016-1238.ch001.

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Haddad, P. S., E. L. Duarte, M. S. Baptista, G. F. Goya, C. A. P. Leite, and R. Itri. "Synthesis and characterization of silica-coated magnetic nanoparticles." In Surface and Colloid Science, 232–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/b97092.

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Agotegaray, Mariela A., and Verónica L. Lassalle. "Future Perspectives on Silica-Coated Magnetic Nanoparticles in Biomedicine." In SpringerBriefs in Molecular Science, 81–84. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50158-1_8.

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Schweigert, I. V., M. J. Carrier, and M. R. Zachariah. "Size Dependent Properties Of Nanoscale Particles (Silica)." In Recent Trends in Theory of Physical Phenomena in High Magnetic Fields, 131–40. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0221-9_11.

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Agotegaray, Mariela A., and Verónica L. Lassalle. "Synthesis of Solid Silica-Coated Magnetic Nanoparticles for Drug Targeting." In SpringerBriefs in Molecular Science, 39–49. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50158-1_4.

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Tanaka, Katsufumi, Kiyohito Koyama, and Touru Watanabe. "Strain Dependence of Dynamic Viscoelastic Properties of ER Fluids with Iron(III) Hydroxide Coated Silica Particles." In Progress in Electrorheology, 273–79. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1036-3_22.

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Kobayashi, Y., and L. M. Liz-Marzán. "Preparation of silica-coated magnetic nanoparticles." In Studies in Surface Science and Catalysis, 363–66. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)82107-8.

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Gaur, Rashmi, Shivani Sharma, Yukti Monga, and Rakesh Kumar Sharma. "Characterization of Metal-Immobilized Silica Nanoparticles and Silica-Coated Magnetic Nanoparticles." In Silica-Based Organic–Inorganic Hybrid Nanomaterials, 145–69. WORLD SCIENTIFIC (EUROPE), 2019. http://dx.doi.org/10.1142/9781786347473_0005.

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McBain, Stuart C., Humphrey H. P. Yiu, Alicia J. El Haj, and Jon Dobson. "DNA delivery using polyethyleneimine (PEI) coated iron oxide-silica mesostructured particles." In Recent Progress in Mesostructured Materials - Proceedings of the 5th International Mesostructured Materials Symposium (IMMS2006), Shanghai, P.R. China, August 5-7, 2006, 869–72. Elsevier, 2007. http://dx.doi.org/10.1016/s0167-2991(07)80456-3.

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Shibuya, Hajime, Mika Shimada, Noboru Suzuki, Hirotomo Ito, Ken-ichi Iimura, Teiji Kato, and Toshiaki Kakihara. "Studies on the Preparation of Silica-Coated Carbon Particles by Sol-gel Method." In Studies in Surface Science and Catalysis, 367–70. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)82108-x.

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Conference papers on the topic "Silica coated magnetic particles"

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Yang, Qiufeng, Zhao Dai, Kun Yang, and Yihong Li. "Preparation of magnetic Fe3O4microspheres using different surfactant and silica-coated magnetic particles." In 3rd International Conference on Future Energy, Environment and Materials. Southampton, UK: WIT Press, 2015. http://dx.doi.org/10.2495/feem140471.

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Qiufeng, Yang, Dai Zhao, Yang Kun, and Li Yihong. "Preparation of Magnetic Fe3O4 Microspheres Using Different Surfactant and Silica-coated Magnetic Particles." In AASRI International Conference on Industrial Electronics and Applications (IEA 2015). Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/iea-15.2015.13.

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He, Xiaoxiao, Kemin Wang, Weihong Tan, Dan Xiao, Xiaohai Yang, and Jun Li. "Preparation and application of silica-coated magnetic nanoparticles." In International Conference on Sensing units and Sensor Technology, edited by Yikai Zhou and Shunqing Xu. SPIE, 2001. http://dx.doi.org/10.1117/12.440241.

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Panda, Biswajit, and P. S. Goyal. "Oleic acid coated magnetic nano-particles: Synthesis and characterizations." In NANOFORUM 2014. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4917661.

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Jenness, Nathan J., Randall M. Erb, Benjamin B. Yellen, and Robert L. Clark. "Magnetic and optical manipulation of spherical metal-coated Janus particles." In SPIE NanoScience + Engineering, edited by Kishan Dholakia and Gabriel C. Spalding. SPIE, 2010. http://dx.doi.org/10.1117/12.861877.

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Coppola, B., L. Di Maio, P. Scarfato, and L. Incarnato. "Use of polypropylene fibers coated with nano-silica particles into a cementitious mortar." In THE SECOND ICRANET CÉSAR LATTES MEETING: Supernovae, Neutron Stars and Black Holes. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4937334.

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Rijal, Moch Saifur, Antony Mahendra, Kusuma Dwi Lestari, Aprillia Nurcahya Putri, Munasir Munasir, Diah Hari Kusumawati, Nugrahani Primary Putri, et al. "Graphene from glucose coated silica sand for water purification applications." In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0015680.

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Wisutiratanamanee, Apisit, Sirilux Poompradub, and Kunakorn Poochinda. "Preparation of antibacterial composite material of natural rubber particles coated with silica and titania." In International Conference on Experimental Mechanics 2013 and the Twelfth Asian Conference on Experimental Mechanics, edited by Somnuk Sirisoonthorn. SPIE, 2014. http://dx.doi.org/10.1117/12.2054202.

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Chen, Yingjie, Xiaoxiao He, Kemin Wang, Ping Wu, and Weihong Tan. "Study on the Cytochrome C Separation Based on Silica Coated Magnetic Nanoparticles." In 2007 1st International Conference on Bioinformatics and Biomedical Engineering. IEEE, 2007. http://dx.doi.org/10.1109/icbbe.2007.37.

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Rettob, Abraham Laurens, Nuryono Nuryono, Yenni Pintauli Pasaribu, Yorinda Buyang, and Richard Samuel Waremwa. "Adsorption of [AuCl4]- on Iron Sand Magnetic Material Coated with Aminobezimidazol Modified Silica." In Proceedings of the International Conference on Science and Technology (ICST 2018). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/icst-18.2018.58.

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