Magnetic nanoparticles of core–shell structure

Kalska-Szostko, B.; Wykowska, U.; Satuła, D.

doi:10.1016/j.colsurfa.2015.05.040

Cited by 33 publications

(20 citation statements)

References 44 publications

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“…Average grain size or better average diffracting zone of the obtained nanoparticles estimated from XRD patterns fall between 6 and 12 nm, which concur with our expectation based on previous studies [32] based on a number of deposited layers in each particle. The calculations of average grain size were done on ferrite signals, what omit thickness of any other layers.…”

Section: X-ray Diffractionsupporting

confidence: 92%

“…The whole substrate solution was deoxygenated under an argon flow and vigorously mixed by a magnetic stirrer at a temperature of 240 °C for 30 min. The products were then cooled down to RT and divided into four parts . As a result, small particles (3–5 nm) were obtained which served as seeds for the following synthesis.…”

Section: Methodsmentioning

confidence: 99%

“…The products were then cooled down to RT and divided into four parts. [32] As a result, small particles (3-5 nm) were obtained which served as seeds for the following synthesis. Similarly, seeds from other M(acac) x precursors were fabricated.…”

Section: Preparation Of Seeds Particlesmentioning

confidence: 99%

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Ferrite Core‐Shell Nanoparticles Synthesized by Seed‐Based Method Characterization and Potential Application

Klekotka

Piotrowska

Satuła

et al. 2018

Physica Status Solidi (a)

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This paper is dedicated to a systematic study on the selected type of core‐shell magnetic nanoparticles. Described fabrication procedure adopts the idea of seeds‐based synthesis followed by subsequent layer growth. Each layer of formed particles is obtained from complexes of M(acac)x, where M stands for 3d elements (Fe, Co, Ni, Mn) and x is equal to 2 or 3 resulting in oxide formation. Obtained core‐shell nanoparticles are structurally examined by X‐ray diffraction, infra‐red spectroscopy, and transmission electron microscopy. Magnetic properties of the proposed nanoparticles are tested by Mössbauer spectroscopy. Variable in layered manner composition allows for tuning of physicochemical properties of the investigated material. Designed on demand layer‐by‐layer growth gives the opportunity to obtain desired final properties of, for example, sensing character or selectivity of interacting spices.

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Section: X-ray Diffractionsupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

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Ferrite Core‐Shell Nanoparticles Synthesized by Seed‐Based Method Characterization and Potential Application

Klekotka

Piotrowska

Satuła

et al. 2018

Physica Status Solidi (a)

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“…Compared with the sandwich structure, the core-shell structure magnetic complex was easier to prepare and the surface modification of Nano-Fe3O4 can be completed by a one-step method [103], which produced a superparamagnetic product and easier to be separated. For example, Kalska et al [104] prepared The magnetic properties of these four different structures varies. The core-shell structure has a number of advantages over the other three structures.…”

Section: Structure Of Nano-fe3o4 Composite Materialsmentioning

confidence: 99%

Preparation and Potential Applications of Super Paramagnetic Nano-Fe3O4

et al. 2018

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Ferroferric oxide nanoparticle (denoted as Nano-Fe 3 O 4 ) has low toxicity and is biocompatible, with a small particle size and a relatively high surface area. It has a wide range of applications in many fields such as biology, chemistry, environmental science and medicine. Because of its superparamagnetic properties, easy modification and function, it has become an important material for addressing a number of specific tasks. For example, it includes targeted drug delivery nuclear magnetic resonance (NMR) imaging in biomedical applications and in environmental remediation of pollutants. Few articles describe the preparation and modification of Nano-Fe 3 O 4 in detail. We present an evaluation of preparation methodologies, as the quality of material produced plays an important role in its successful application. For example, with modification of Nano-Fe 3 O 4 , the surface activation energy is reduced and good dispersion is obtained.

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“…Magnetic particles in particular are attracting attention for use in biotechnology because of their versatility: they can be functionalized with various ligands [93][94][95] (amines, carboxyls, etc) or coated with different materials 96,97 (silica, cobalt, gold, etc). For example, a magnetic bead assay was developed to facilitate measuring the binding affinity of aptamers to small molecules.…”

Section: Magnetic Particles As a Partitioning Methodsmentioning

confidence: 99%

Gold Nanoparticles as a Platform for Small Molecule SELEX

Smith¹

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Both naturally occurring and synthetic small molecules play a significant role in a variety of applications. For example, small molecule food contaminants that occur infield or postharvest are of importance, both agriculturally and economically. Mycotoxins are toxic secondary metabolites produced by filamentous fungi that can potentially contaminate a variety of foodstuffs. Detection of these small molecules is required as mycotoxins pose multiple health-risks and proceed past processing and food safety.Current detection methods are expensive, time consuming and unavailable for on-site detection leaving an unmet need for alternative methods of detection.Aptamers are single stranded oligonucleotides that can bind to specific target molecules with high selectivity and affinity. Emerging as molecular recognition agents, aptamers can be used in a number of novel detection methods for small molecule quantification and analysis. Aptamers are selected through an in vitro process known as Systematic Evolution of Ligands by Exponential Enrichment (SELEX). Aptamers can be adsorbed onto the surface of citrate-capped AuNPs to serve as the molecular recognition element of a rapid colourimetric biosensor assay. Based on this interaction, AuNPs could potentially serve as a novel platform for small molecule SELEX. Although molecular recognition of small molecules is of great interest, selection of aptamers for small molecules has proven to be a challenge. Furthermore, not all of these reported small molecule aptamers can be easily incorporated in the AuNP bioassay. Selecting for aptamers in a manner that will mimic established AuNP biosensor conditions provides a number of advantages compared to traditional SELEX. As a first step towards establishing a AuNP SELEX platform, we evaluated the partitioning of mycotoxin iv aptamers that remain on the AuNP surface from aptamers-target complexes in solution.Having uncovered several challenges associated with AuNPs as a SELEX partitioning strategy, we next synthesized, optimized, and characterized core-shell gold coated magnetic nanoparticles (Fe3O4-AuNPs), which were phase-transferred aqueous solution.We demonstrated that Fe3O4-AuNPs could function as an improved AuNP SELEX platform and provide a novel method to study ssDNA aptamer-AuNP non-specific interactions. Finally, our studies on the adsorption and separation of ssDNA aptamers using Fe3O4-AuNPs highlight future opportunities for novel aptamer biomedical applications and other biosensor development.v

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Magnetic nanoparticles of core–shell structure

Cited by 33 publications

References 44 publications

Ferrite Core‐Shell Nanoparticles Synthesized by Seed‐Based Method Characterization and Potential Application

Ferrite Core‐Shell Nanoparticles Synthesized by Seed‐Based Method Characterization and Potential Application

Preparation and Potential Applications of Super Paramagnetic Nano-Fe3O4

Gold Nanoparticles as a Platform for Small Molecule SELEX

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