Versatile ferrofluids based on polyethylene glycol coated iron oxide nanoparticles

Brullot, Ward; Reddy, Naveen Krishna; Wouters, Jelle; Valev, Ventsislav K.; Goderis, Bart; Vermant, Jan; Verbiest, Thierry

doi:10.1016/j.jmmm.2012.01.032

Cited by 81 publications

(67 citation statements)

References 24 publications

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“…(13) to a linear relation between the signal at the fundamental frequency of the applied magnetic field and the amplitude of the applied magnetic field, allowing determination of the Verdet constant of the material. 10,21,34 For the measured superparamagnetic nanocomposite, a clear signal was detected on the lock-in amplifier for all uneven harmonics until the 13th harmonic, while no signal was observed for any even harmonic. Purely dia-and paramagnetic samples only produced a measurable signal at the fundamental frequency.…”

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confidence: 93%

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Magneto-optical harmonic susceptometry of superparamagnetic materials

Vandendriessche

Brullot

Slavov

et al. 2013

Applied Physics Letters

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We describe a technique to optically characterize superparamagnetism. Faraday rotation measurements are performed on a superparamagnetic nanocomposite using small alternating current magnetic fields. The superparamagnetism of the iron oxide nanoparticles causes signals at the uneven harmonics of the magnetic field frequency. These signals provide information on the magnetic moment of the superparamagnetic nanoparticles. Dia- and paramagnetism do not cause signals at higher harmonics, resulting in a high sensitivity to superparamagnetism, even in samples with large dia- or paramagnetic contributions. This technique provides a rapid, economical method to characterize superparamagnetism in composite samples not easily accessible by other techniques.

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confidence: 93%

“…10 Briefly, a round-bottom flask with 37.5 ml of diethylene glycol and 25 ml of octylamine was heated to 150 C while stirring. Separately, 2.4 g of anhydrous FeCl 3 was dissolved in a beaker with 3 ml of water and 10 ml of diethylene glycol.…”

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confidence: 99%

Magneto-optical harmonic susceptometry of superparamagnetic materials

Vandendriessche

Brullot

Slavov

et al. 2013

Applied Physics Letters

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“…In situations, where particle stability is of utmost importance, as in biomedical applications, silane chemistry is being explored as an alternative functionalization route because molecules can bind with the surface of the particle, enhancing particle stability in suspensions at physiological conditions [19]. Hydrophilic molecules are usually polymeric [e.g., poly(ethylene glycol)], that can often linked to nanoparticle cores via silanes [20,21]. Carlos Rinaldi and co-workers [22] synthesized stable colloidal dispersions of monodisperse magnetic nanoparticles in water by the thermal decomposition method, and exchanging the oleic acid molecules on the surface of the particles for PEG-silane chains.…”

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confidence: 99%

A new procedure for preparation of polyethylene glycol-grafted magnetic iron oxide nanoparticles

Khoee

Kavand

2014

J Nanostruct Chem

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Magnetic iron oxide nanoparticles (MNPs) have been widely explored for use in biomedical applications. In the present study, iron oxide nanoparticles were connected to methoxy poly(ethylene glycol) (mPEG) via a new method. The mPEG was acrylated at first and Michael reaction was carried out between acrylated mPEG and 3-aminopropyl triethoxysilane as a coupling agent. The chemical structures of modified mPEG were characterized by Fourier transform-infrared spectroscopy (FT-IR) and nuclear magnetic resonance. In the next step, iron oxide nanoparticle was coupled with the above-mentioned adduct. Preparation of magnetic nanoparticles with average particle size of 20-30 nm was proved by scanning electron microscopy. The structure of mPEG grafted on the surface of MNPs was confirmed by FT-IR spectroscopy and thermal gravimetric analysis. The synthesized nanoparticles have the potential to be used in different biomedical applications.

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“…Nanoparticles of iron oxides are utilized in the cosmetic industry as sunscreens. Iron oxide nanoparticles are also used in pharmaceutical science (for magnetic separation of chemical compounds), DNA detection, magnetic drug targeting, magnetic resonance imaging (contrast agents), and as a component in dietary supplements and nutrients (Schwegmann et al 2010, Brullot et al 2012, Nor et al 2012, Kadar et al 2010, Carlos et al 2012, Adeleye et al 2013, Chen et al 2011, Pawlett et al 2013, Mohmood et al 2013. Manufacturers of products containing NMs are convinced that they have positive effects on human health and improve the appearance of skin, reduce sweating, and prevent infl ammation caused by microorganisms.…”

Section: Presence Of Nanomaterials In the Environmentmentioning

confidence: 99%

Inorganic nanomaterials in the aquatic environment: behavior, toxicity, and interaction with environmental elements

Krzyżewska¹,

Kyzioł-Komosińska²,

Rosik-Dulewska³

et al. 2016

Archives of Environmental Protection

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Abstract:The aim of this paper is to present characteristics, toxicity and environmental behavior of nanoparticles (NPs) (silver, copper, gold, zinc oxide, titanium dioxide, iron oxide) that most frequently occur in consumer products. In addition, NPs are addressed as the new aquatic environmental pollutant of the 21 st century. NPs are adsorbed onto particles in the aquatic systems (clay minerals, fulvic and humic acids), or they can adsorb environmental pollutants (heavy metal ions, organic compounds). Nanosilver (nAg) is released from consumer products into the aquatic environment. It can threaten aquatic organisms with high toxicity. Interestingly, copper nanoparticles (Cu-NPs) demonstrate higher toxicity to bacteria and aquatic microorganisms than those of nanosilver nAg. Their small size and reactivity can cause penetration into the tissues and interfere with the metabolic systems of living organisms and bacterial biogeochemical cycles. The behavior of NPs is not fully recognized. Nevertheless, it is known that NPs can agglomerate, bind with ions (chlorides, sulphates, phosphates) or organic compounds. They can also be bound or immobilized by slurry. The NPs behavior depends on process conditions, i.e. pH, ionic strength, temperature and presence of other chemical compounds. It is unknown how NPs behave in the aquatic environment. Therefore, the research on this problem should be carried out under different process conditions. As for the toxicity, it is important to understand where the differences in the research results come from. As NPs have an impact on not only aquatic organisms but also human health and life, it is necessary to recognize their toxic doses and know standards/regulations that determine the permissible concentrations of NPs in the environment.Unauthenticated Download Date | 5/12/18 7:36 AM

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Versatile ferrofluids based on polyethylene glycol coated iron oxide nanoparticles

Cited by 81 publications

References 24 publications

Magneto-optical harmonic susceptometry of superparamagnetic materials

Magneto-optical harmonic susceptometry of superparamagnetic materials

A new procedure for preparation of polyethylene glycol-grafted magnetic iron oxide nanoparticles

Inorganic nanomaterials in the aquatic environment: behavior, toxicity, and interaction with environmental elements

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