Ordered arrays of FePt nanoparticles on unoxidized silicon surface by wet chemistry

Mari, Alessandra; Agostinelli, E.; Fiorani, D.; Flamini, Alberto; Laureti, S.; Peddis, Davide; Testa, A. M.; Varvaro, G.; Mansilla, M. Vásquez; Mezzi, A.; Kačiulis, S.

doi:10.1016/j.spmi.2009.02.001

Cited by 10 publications

(4 citation statements)

References 19 publications

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“…Another interesting result of the XPS analysis is the relatively high abundance (2.1 atomic %) of iron ions Fe 3+ (710.2 eV; Mari et al, 2009 ) on the surface of graphite rods deriving from the treatment “S,” whereas it was undetectable in the other samples. The presence of iron was also visually confirmed by the fact that when the graphite rod from the treatment “S” was removed from the serum bottle and briefly exposed to the atmospheric oxygen before introducing into XPS apparatus, its surface immediately turned reddish.…”

Section: Resultsmentioning

confidence: 99%

The “Oil-Spill Snorkel”: an innovative bioelectrochemical approach to accelerate hydrocarbons biodegradation in marine sediments

et al. 2015

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This study presents the proof-of-concept of the “Oil-Spill Snorkel”: a novel bioelectrochemical approach to stimulate the oxidative biodegradation of petroleum hydrocarbons in sediments. The “Oil-Spill Snorkel” consists of a single conductive material (the snorkel) positioned suitably to create an electrochemical connection between the anoxic zone (the contaminated sediment) and the oxic zone (the overlying O2-containing water). The segment of the electrode buried within the sediment plays a role of anode, accepting electrons deriving from the oxidation of contaminants. Electrons flow through the snorkel up to the part exposed to the aerobic environment (the cathode), where they reduce oxygen to form water. Here we report the results of lab-scale microcosms setup with marine sediments and spiked with crude oil. Microcosms containing one or three graphite snorkels and controls (snorkel-free and autoclaved) were monitored for over 400 days. Collectively, the results of this study confirmed that the snorkels accelerate oxidative reactions taking place within the sediment, as documented by a significant 1.7-fold increase (p = 0.023, two-tailed t-test) in the cumulative oxygen uptake and 1.4-fold increase (p = 0.040) in the cumulative CO2 evolution in the microcosms containing three snorkels compared to snorkel-free controls. Accordingly, the initial rate of total petroleum hydrocarbons (TPH) degradation was also substantially enhanced. Indeed, while after 200 days of incubation a negligible degradation of TPH was noticed in snorkel-free controls, a significant reduction of 12 ± 1% (p = 0.004) and 21 ± 1% (p = 0.001) was observed in microcosms containing one and three snorkels, respectively. Although, the “Oil-Spill Snorkel” potentially represents a groundbreaking alternative to more expensive remediation options, further research efforts are needed to clarify factors and conditions affecting the snorkel-driven biodegradation processes and to identify suitable configurations for field applications.

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Section: Resultsmentioning

confidence: 99%

The “Oil-Spill Snorkel”: an innovative bioelectrochemical approach to accelerate hydrocarbons biodegradation in marine sediments

et al. 2015

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“…A pronounced peak at $ 80 K in M(T) curves and a large value of saturation magnetic field in the hysteresis loop measured at 5 K are noticeable. In the first appearance, the observed magnetic features resembled with the materials exhibiting (1) superparamagnetism [42,43], (2) a spin reorientation tranistion (SRT) from out of plane to inplane with increasing temperature [44], and (3) a mixture of ferromagnetic and antiferromagnetic phases [45][46][47][48][49][50]. If the films are superparamagnetic, peak in ZFC and FC should shift toward the lower temperature with measurements performed under higher magnetic fields.…”

Section: Magnetic Propertiesmentioning

confidence: 84%

On the growth and magnetic properties of flower-like nanostructures formed on diffusion of FePt with Si substrate

Sharma

Kaushik

Esashi

et al. 2013

Journal of Magnetism and Magnetic Materials

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“…An alternative approach is the use of masks that guide the self‐assembly of the MNPs exclusively onto the bare areas of the substrate, while the lift‐off of the mask removes the rest of the MNPs. The masks are prepared by spin‐coating a polymer on a surface and posterior pattern with the desired motive by means of photolithography 92, 93. Using this strategy, 3–4 nm FePt NPs were covalently anchored on a H‐terminated silicon surface and patterned into ordered arrays of 1 μm 2 dots with heights of 15–30 nm, which corresponded to 2–4 layers of NPs (considering the surfactant coating of the MNP was ∼2 nm) 92…”

Section: Assisted Self‐assembly and Organizationmentioning

confidence: 99%

Structuration and Integration of Magnetic Nanoparticles on Surfaces and Devices

Bellido

Domingo

Ojea-Jiménez

et al. 2012

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Different experimental approaches used for structuration of magnetic nanoparticles on surfaces are reviewed. Nanoparticles tend to organize on surfaces through self-assembly mechanisms controlled by non-covalent interactions which are modulated by their shape, size and morphology as well as by other external parameters such as the nature of the solvent or the capping layer. Further control on the structuration can be achieved by the use of external magnetic fields or other structuring techniques, mainly lithographic or atomic force microscopy (AFM)-based techniques. Moreover, results can be improved by chemical functionalization or the use of biological templates. Chemical functionalization of the nanoparticles and/or the surface ensures a proper stability as well as control of the formation of a (sub)monolayer. On the other hand, the use of biological templates facilitates the structuration of several families of nanoparticles, which otherwise may be difficult to form, simply by establishing the experimental conditions required for the structuration of the organic capsule. All these experimental efforts are directed ultimately to the integration of magnetic nanoparticles in sensors which constitute the future generation of hybrid magnetic devices.

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Ordered arrays of FePt nanoparticles on unoxidized silicon surface by wet chemistry

Cited by 10 publications

References 19 publications

The “Oil-Spill Snorkel”: an innovative bioelectrochemical approach to accelerate hydrocarbons biodegradation in marine sediments

The “Oil-Spill Snorkel”: an innovative bioelectrochemical approach to accelerate hydrocarbons biodegradation in marine sediments

On the growth and magnetic properties of flower-like nanostructures formed on diffusion of FePt with Si substrate

Structuration and Integration of Magnetic Nanoparticles on Surfaces and Devices

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