Quantitative and qualitative characterization of aquatic iron oxyhydroxide particles by EF‐TEM

Mavrocordatos,; Perret,

doi:10.1046/j.1365-2818.1998.00345.x

Cited by 11 publications

(4 citation statements)

References 24 publications

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“…Wang et al (2004) employed this method to image Fe(III)-doped TiO 2 nanoparticles (2-4 nm) in an aqueous environment with a special sample holder. Mavrocordatos and Perret (1998) embedded iron-rich particles (30-200 nm) in resin and then sectioned these samples for visualization by TEM and EELS (Mavrocordatos and Perret 1998).…”

Section: Microscopy and Microscopy-related Techniquesmentioning

confidence: 99%

Detection and characterization of engineered nanoparticles in food and the environment

Tiede

Boxall

Tear

et al. 2008

Food Additives & Contaminants: Part A

645

360

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Nanotechnology is developing rapidly and, in the future, it is expected that increasingly more products will contain some sort of nanomaterial. However, to date, little is known about the occurrence, fate and toxicity of nanoparticles. The limitations in our knowledge are partly due to the lack of methodology for the detection and characterisation of engineered nanoparticles in complex matrices, i.e. water, soil or food. This review provides an overview of the characteristics of nanoparticles that could affect their behaviour and toxicity, as well as techniques available for their determination. Important properties include size, shape, surface properties, aggregation state, solubility, structure and chemical composition. Methods have been developed for natural or engineered nanomaterials in simple matrices, which could be optimized to provide the necessary information, including microscopy, chromatography, spectroscopy, centrifugation, as well as filtration and related techniques. A combination of these is often required. A number of challenges will arise when analysing environmental and food materials, including extraction challenges, the presence of analytical artifacts caused by sample preparation, problems of distinction between natural and engineered nanoparticles and lack of reference materials. Future work should focus on addressing these challenges.

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Section: Microscopy and Microscopy-related Techniquesmentioning

confidence: 99%

Detection and characterization of engineered nanoparticles in food and the environment

Tiede

Boxall

Tear

et al. 2008

Food Additives & Contaminants: Part A

645

360

View full text Add to dashboard Cite

show abstract

“…including microscopy approaches [8,9], chromatography [10,11], centrifugation [12], laser scattering [13] filtration [14][15][16], spectroscopic [17,18] and related techniques. Generally, difficulties arise due to a lack of analytical tools capable of characterizing and quantifying particles at environmentally relevant concentrations (low ppb) or in complex environmental matrices that may induce heterodisperse particle size distributions [19].…”

Section: Introductionmentioning

confidence: 99%

Characterization of silver nanoparticles using flow-field flow fractionation interfaced to inductively coupled plasma mass spectrometry

Poda

Bednar

Kennedy

et al. 2011

Journal of Chromatography A

160

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Harmon, A.; Hull, M.; Mitrano, D. M.; Ranville, J. F.; and Steevens, J., "Characterization of silver nanoparticles using flow-field flow fractionation interfaced to inductively coupled plasma mass spectrometry" (2010 a b s t r a c tThe ability to detect and identify the physiochemical form of contaminants in the environment is important for degradation, fate and transport, and toxicity studies. This is particularly true of nanomaterials that exist as discrete particles rather than dissolved or sorbed contaminant molecules in the environment. Nanoparticles will tend to agglomerate or dissolve, based on solution chemistry, which will drastically affect their environmental properties. The current study investigates the use of field flow fractionation (FFF) interfaced to inductively coupled plasma-mass spectrometry (ICP-MS) as a sensitive and selective method for detection and characterization of silver nanoparticles. Transmission electron microscopy (TEM) is used to verify the morphology and primary particle size and size distribution of precisely engineered silver nanoparticles. Subsequently, the hydrodynamic size measurements by FFF are compared to dynamic light scattering (DLS) to verify the accuracy of the size determination. Additionally, the sensitivity of the ICP-MS detector is demonstrated by fractionation of g/L concentrations of mixed silver nanoparticle standards. The technique has been applied to nanoparticle suspensions prior to use in toxicity studies, and post-exposure biological tissue analysis. Silver nanoparticles extracted from tissues of the sediment-dwelling, freshwater oligochaete Lumbriculus variegatus increased in size from approximately 31-46 nm, indicating a significant change in the nanoparticle characteristics during exposure.Published by Elsevier B.V.

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“…The value extrapolated to zero thickness is 0.778, compared with a theoretical value of 0.72. The dependency of the partial cross‐session ratios of O‐K and Fe‐L edges on sample thickness is different from that determined for aquatic iron oxyhydroxide particles (Mavrocordatos & Perret, 1998), in which a deconvolution could be performed in order to correct for a multiple scattering effect in their raw spectra. Using k‐factors corresponding to experimental thicknesses estimated by using the ratio of ZL and LL intensities, the ratio of oxygen and iron can be quantified in EELS spectra of core‐loss and LL energy regions from quenched molten iron at high pressures and temperatures (e.g.…”

Section: Resultsmentioning

confidence: 99%

Combining FIB milling and conventional Argon ion milling techniques to prepare high‐quality site‐specific TEM samples for quantitative EELS analysis of oxygen in molten iron

Miyajima

Holzapfel

Asahara

et al. 2010

Journal of Microscopy

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This paper reports a procedure to combine the focused ion beam micro-sampling method with conventional Ar-milling to prepare high-quality site-specific transmission electron microscopy cross-section samples. The advantage is to enable chemical and structural evaluations of oxygen dissolved in a molten iron sample to be made after quenching and recovery from high-pressure experiments in a laser-heated diamond anvil cell. The evaluations were performed by using electron energy-loss spectroscopy and high-resolution transmission electron microscopy. The high signal to noise ratios of electron energy-loss spectroscopy core-loss spectra from the transmission electron microscopy thin foil, re-thinned down to 40 nm in thickness by conventional Argon ion milling, provided us with oxygen quantitative analyses of the quenched molten iron phase. In addition, we could obtain lattice-fringe images using high-resolution transmission electron microscopy. The electron energy-loss spectroscopy analysis of oxygen in Fe(0.94)O has been carried out with a relative accuracy of 2%, using an analytical procedure proposed for foils thinner than 80 nm. Oxygen K-edge energy-loss near-edge structure also allows us to identify the specific phase that results from quenching and its electronic structure by the technique of fingerprinting of the spectrum with reference spectra in the Fe-O system.

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Quantitative and qualitative characterization of aquatic iron oxyhydroxide particles by EF‐TEM

Cited by 11 publications

References 24 publications

Detection and characterization of engineered nanoparticles in food and the environment

Detection and characterization of engineered nanoparticles in food and the environment

Characterization of silver nanoparticles using flow-field flow fractionation interfaced to inductively coupled plasma mass spectrometry

Combining FIB milling and conventional Argon ion milling techniques to prepare high‐quality site‐specific TEM samples for quantitative EELS analysis of oxygen in molten iron

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