Structure and Properties of Iron Oxide Nanoparticles Encapsulated by Phospholipids with Poly(ethylene glycol) Tails

Штыкова, Э. В.; Huang, Xinlei; Remmes, Nicholas B.; Baxter, David V.; Stein, Barry D.; Dragnea, Bogdan; Svergun, Dmitri I.; Bronstein, Lyudmila M.

doi:10.1021/jp075235c

Cited by 71 publications

(84 citation statements)

References 62 publications

(129 reference statements)

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“…In general, small particles (with radius R 1 ) as primary particles construct larger particles or secondary structures (with radius R 2 ) as clusters with agglomeration and/or aggregation [17]. The cluster formation is affected by the magnetic interparticle interactions between the nanoparticles [18] and the fractal dimension, indicating that a reaction-limited mechanism occurs in the magnetic nanoparticles system [36]. The fractal dimension of Mn x Fe 3−x O 4 tends to be similar to 3, corresponding to the growth of the structures in three dimensions.…”

Section: Resultsmentioning

confidence: 99%

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Nanoscale Clustering and Magnetic Properties of Mn x Fe3−x O4 Particles Prepared from Natural Magnetite

Taufiq

Sunaryono

Putra

et al. 2015

J Supercond Nov Magn

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A series of Mn x Fe 3−x O 4 (0 ≤ x ≤ 1) nanoparticles was successfully synthesized via a simple coprecipitation method. The starting material was a natural magnetite purified from local iron sand. Crystallite nanoparticles were produced by drying without using a high calcination temperature. Rietveld analysis of the X-ray diffractometry (XRD) data for all samples demonstrated that the Mn ions partially substituted the Fe ions in the spinel cubic structure of the Fe 3 O 4 to form Mn x Fe 3−x O 4 phases. We applied two lognormal spherical and single mass fractal models to the analysis of the small-angle neutron scattering (SANS) data and revealed that the primary Mn x Fe 3−x O 4 particles ranged in size from 1.5 to 3.8 nm and formed three-dimensional Darminto

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Section: Resultsmentioning

confidence: 99%

“…To explore these dependencies, a powerful small-angle scattering technique is required. This technique has the capability to examine the hierarchical nanostructures, the primary particles, the clusters within the samples [18], and fractal structures of the particles [19].…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Clustering and Magnetic Properties of Mn x Fe3−x O4 Particles Prepared from Natural Magnetite

Taufiq

Sunaryono

Putra

et al. 2015

J Supercond Nov Magn

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“…The multilayered interior of the model reflects the process of the formation of the iron oxide core from smaller nuclei, as discussed in our preceding paper. 34 The shape of the aggregates, also presented in the upper inset of Figure 4, reveals an irregular conglomerate containing about 30-40 individual NP1-PMAcOD particles (in panel b, the aggregate is superimposed onto the single particle). Because the zero-angle scattering I(0) is proportional to the squared volume and the volume fraction and the aggregates (curve 4) yield practically the same I(0) value as the NP1-PMAcOD particles (curve 2), the volume fraction of the aggregates in the sample does not exceed 0.1%.…”

Section: Characterization By Saxsmentioning

confidence: 88%

Hydrophilic Monodisperse Magnetic Nanoparticles Protected by an Amphiphilic Alternating Copolymer

et al. 2008

Self Cite

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Iron oxide nanoparticles (NPs) with diameters of 16.1, 20.5, and 20.8 nm prepared from iron oleate precursors were coated with poly(maleic acid-alt-1-octadecene) (PMAcOD). The coating procedure exploited hydrophobic interactions of octadecene and oleic acid tails while hydrolysis of maleic anhydride moieties allowed the NP hydrophilicity. The PMAcOD nanostructure in water and the PMAcOD-coated NPs were studied using transmission electron microscopy, ζ-potential measurements, small-angle X-ray scattering, and fluorescence measurements. The combination of several techniques suggests that independently of the iron oxide core and oleic acid shell structures, PMAcOD encapsulates NPs, forming stable hydrophilic shells which withstand absorption of hydrophobic molecules, such as pyrene, without shell disintegration. Moreover, the PMAcOD molecules are predominantly attached to a single NP instead of self-assembling into the PMAcOD disklike nanostructures or attachment to several NPs. This leads to highly monodisperse aqueous samples with only a small fraction of NPs forming large aggregates due to cross-linking by the copolymer macromolecules.

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“…Various metal oxides nanoparticles, due to their optical, electrical and magnetic properties [1] have numerous applications including sensors, catalysis, biomedical diagnostics and environmental remediation [2][3][4] . Since engineered nanoparticles (ENPs) released to the environment go down the soil, the effects of ENPs on soil processes and the organisms that carry them out should be grasped.…”

Section: Introductionmentioning

confidence: 99%

Impact of Metal Oxide Nanoparticles on Beneficial Soil Microorganisms and their Secondary Metabolites

Haris¹,

Ahmad²

2017

IJLSSR

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ABSTRACT-In this study, the effect of ZnO and TiO 2 -NPs on beneficial soil microorganisms and their secondary metabolites production was investigated. The antibacterial potential of NPs were determined by growth kinetics of P. aeruginosa, P. fluorescens and B. amyloliquefaciens. Significantly decreased in the cell viability based on optical density measurements were observed upon treatment with increasing concentrations of NPs. While comparing the effect of the different concentrations of the NPs (200 µg/ml) on IAA production by different bacterial strains, ZnO nanoparticles showed greater inhibitory effect than TiO 2 -NPs on IAA production by bacterial strains. The effect of Nanoparticles on phosphate solubilization was found inhibitory at 200 µg/ml. Treatment with ZnO showed concentration dependent enhancement in siderophore production by bacteriaby exposure to ZnO-NPs whereas TiO 2 -NPs showed concentration dependent progressive decline for iron binding siderophore molecules. Reduction in antibiotic production by P. aeruginosa and P. fluorescens was noticed in the presence of ZnO and TiO 2 as compared to the control. The fluorescence of NADH released by P. aeruginosa was observed to be quenched in presence of ZnO and TiO 2 -NPs as compared to control. The present study highlights that the impact of nanoparticles on bacterial strains and the release of plant growth promoting substances by PGPR strains was dose dependent, which gives an idea about the level of toxicity of these nanoparticles in the environment. Therefore, the discharge of nanoparticles in the environment should be carefully monitored so that the loss of both structure and functions of agronomically important microbes could be protected from the toxicity of MO-NPs.

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Structure and Properties of Iron Oxide Nanoparticles Encapsulated by Phospholipids with Poly(ethylene glycol) Tails

Cited by 71 publications

References 62 publications

Nanoscale Clustering and Magnetic Properties of Mn x Fe3−x O4 Particles Prepared from Natural Magnetite

Nanoscale Clustering and Magnetic Properties of Mn x Fe3−x O4 Particles Prepared from Natural Magnetite

Hydrophilic Monodisperse Magnetic Nanoparticles Protected by an Amphiphilic Alternating Copolymer

Impact of Metal Oxide Nanoparticles on Beneficial Soil Microorganisms and their Secondary Metabolites

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