Magnetic Nanoparticles Preparation, Structure and Properties

Губин, С. П.; Koksharov, Yu. A.; Хомутов, Г.Б.; Yurkov, G. Yu.

doi:10.1002/chin.200601224

Cited by 63 publications

(69 citation statements)

References 1 publication

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“…This result is explained through the interparticle long-range dipolar interaction that decays proportionally to m −3 , where m denotes the average distance between neighboring particles. 34 A composite with higher ψ has larger ε, which agrees with the mixing rule concept. 5 The ε enhancement is most pronounced for d/2r = 0 when the particles form continuous chains and it is negligible when d/2r > 0, i.e., when discontinuous chains are formed.…”

Section: -3supporting

confidence: 73%

“…Consider two continuous particle chains in a dielectric composite that are placed far enough to avoid long-range dipolar interactions. 34 The electric charges induced by an applied voltage V at the two ends of each chain are ±Q 0 , which can be visualized by examining the distribution of surface charge density (Figure 3b-d). When the chains are moved closer, i.e., a is decreased, like charges located at the ends of the chains repel each other and migrate towards the middle of these chains.…”

Section: -3mentioning

confidence: 99%

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Influence of particle arrangement on the permittivity of an elastomeric composite

et al. 2017

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Elastomers are used as dielectric layers contained between the parallel conductive plates of capacitors. The introduction of filler particles into an elastomer changes its permittivity ε. When particle organization in a composite is intentionally varied, this alters its capacitance. Using numerical simulations, we examine how conductive particle chains introduced into polydimethylsiloxane (PDMS) alter ε. The effects of filler volume fraction ψ, interparticle d and interchain spacing a, zigzag angle θ between adjacent particles and overall chain orientation, particle size r, and clearance h between particles and the conductive plates are characterized. When filler particles are organized into chainlike structures rather than being just randomly distributed in the elastomer matrix, ε increases by as much as 85%. When particles are organized into chainlike forms, ε increases with increasing ψ and a, but decreases with increasing d and θ. A composite containing smaller particles has a higher ε when ψ<9% while larger particles provide greater enhancement when ψ is larger than that value. To enhance ε, adjacent particles must be interconnected and the overall chain direction should be oriented perpendicular to the conductive plates. These results are useful for additive manufacturing on electrical applications of elastomeric composites.

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Section: -3supporting

confidence: 73%

Section: -3mentioning

confidence: 99%

Influence of particle arrangement on the permittivity of an elastomeric composite

et al. 2017

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“…17 Strict dosing of iron salts makes it possible to vary NP size and obtain NPs with a sufficiently narrow particle size distribution.…”

Section: Synthesis Of Nano-and Microparticles Of Fe 3 Omentioning

confidence: 99%

Some Peculiarities of Pulmonary Clearance Mechanisms in Rats after Intratracheal Instillation of Magnetite (Fe₃O₄) Suspensions with Different Particle Sizes in the Nanometer and Micrometer Ranges: Are We Defenseless against Nanoparticles?

Katsnelson¹,

Privalova²,

Кузьмин³

et al. 2010

International Journal of Occupational and Environmental Health

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We studied differences between phagocytic responses to nanoparticles (NPs) versus microparticles in the pulmonary region by synthesizing magnetite of different sizes and instilling suspensions of these particles intratracheally into rats' lungs. Ten and 50 nm particles caused a greater increase in cell counts of the bronchoalveolar lavage fluid (BALF) than the instillation of microparticles. The response to 10 nm particles was weaker than to 50 nm ones, and the smaller NPs were more cytotoxic; both were more cytotoxic than the microparticles. Phagocytic activity was also studied using optical and atomic force microscopy. Phagocytes were more "loaded" in the lungs instilled with 10 nm particles as compared with those instilled with 50 nm particles; NPs of both sizes were engulfed more avidly than microparticles. We found in a separate comparative experiment that magnetite NPs were more cytotoxic than titanium dioxide and quartz suspensions having particle size distribution typical of industrial dusts.

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“…Several stabilizer and/or reducing agents have been employed to improve the size dispersity and prevent aggregation, such as polyvinyl alcohol, citric acid and oleic acid . This method is usually employed to obtain MNPs of magnetite and other ferrites in the size range 2–80 nm . With fixed synthesis conditions, the quality of the magnetite nanoparticles is highly reproducible.…”

Section: Design and Synthesis Of Mnpsmentioning

confidence: 99%

Magnetic‐Nanoparticle‐Based Immunoassays‐on‐Chip: Materials Synthesis, Surface Functionalization, and Cancer Cell Screening

Zhu

Kekalo

Ndong

et al. 2016

Adv Funct Materials

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The unique properties of magnetic nanoparticles (MNPs), coupled with versatile surface engineering techniques, have led to a rising class of screening methods that enable separation of specific cell populations from complex biological samples. The growing sophistication and efficiency of these methods have far reaching implications for both fundamental research and clinical applications. In this study, the synthesis and surface engineering of MNPs is reviewed. Here, a model is introduced to illustrate how MNP morphology and particle–particle interactions influence magnetization, which is a key consideration in designing and selecting MNPs for efficient cell separations. Building upon these themes, immunomagnetic assays for capturing, isolating, and characterizing rare cell types from complex biological mixtures are reviewed. Although the focus of this study is on circulating tumor cells, these same techniques can be applied in screening for other rare cells of interest, such as various stem cell populations. In conclusion, current challenges and future directions for magnetic ‐nanomaterial‐based cell screening systems are discussed.

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Magnetic Nanoparticles Preparation, Structure and Properties

Abstract: For Abstract see ChemInform Abstract in Full Text.

Cited by 63 publications

References 1 publication

Influence of particle arrangement on the permittivity of an elastomeric composite

Influence of particle arrangement on the permittivity of an elastomeric composite

Some Peculiarities of Pulmonary Clearance Mechanisms in Rats after Intratracheal Instillation of Magnetite (Fe₃O₄) Suspensions with Different Particle Sizes in the Nanometer and Micrometer Ranges: Are We Defenseless against Nanoparticles?

Magnetic‐Nanoparticle‐Based Immunoassays‐on‐Chip: Materials Synthesis, Surface Functionalization, and Cancer Cell Screening

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Magnetic Nanoparticles Preparation, Structure and Properties

Abstract: For Abstract see ChemInform Abstract in Full Text.

Cited by 63 publications

References 1 publication

Influence of particle arrangement on the permittivity of an elastomeric composite

Influence of particle arrangement on the permittivity of an elastomeric composite

Some Peculiarities of Pulmonary Clearance Mechanisms in Rats after Intratracheal Instillation of Magnetite (Fe3O4) Suspensions with Different Particle Sizes in the Nanometer and Micrometer Ranges: Are We Defenseless against Nanoparticles?

Magnetic‐Nanoparticle‐Based Immunoassays‐on‐Chip: Materials Synthesis, Surface Functionalization, and Cancer Cell Screening

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Product

Resources

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Some Peculiarities of Pulmonary Clearance Mechanisms in Rats after Intratracheal Instillation of Magnetite (Fe₃O₄) Suspensions with Different Particle Sizes in the Nanometer and Micrometer Ranges: Are We Defenseless against Nanoparticles?