Studies were carried out on modified 9Cr–1Mo steel to understand its corrosion as well as passive film characteristics in caustic environment. Potentiodynamic anodic polarization studies were carried out in 1–8 M sodium hydroxide solutions at room temperature (RT) and in boiling conditions. The specimens were passivated at 0.0 …
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Blaney, Lee, "Magnetite (Fe3O4): Properties, Synthesis, and Applications" (2007). Volume 15 - 2007. Paper 5. This Article is brought to you for free and open access by the Lehigh …
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For example, at a concentration of dissolved iron C Fe (d) b u l k = 1. 34 ⋅ 1 0 − 6 mass.% and a flow rate less than 2 m/s the outer layer grows, and when the flow rate is above 2 m/s it dissolves. At a concentration of iron C Fe (d) b u l k = 1. 31 ⋅ 1 0 − 6 mass.%, the dissolution of magnetite is observed already in the entire range ...
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Ishikawa et al. have shown that the doped Magnetite (Fe 3 O 4) films are thermodynamically more stable than ... Fe 3 O 4 matrix and achieving the variation in few properties are encouraging to go for further studies of doped Fe3o4 thin films with higher concentration of same dopant and same concentration of some other suitable …
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APB defects are seen in substrate supported thin film growth of magnetite 13,14,15, ... and comparison with a Fe calibration standard was used to determine the molar concentration of iron in the ...
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As shown in the Fig. 5, the present study showed that increasing concentration of electrolyte also resulted in thicker magnetite film due to the faster …
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Fe3O4 (magnetite) is one of the most elusive quantum materials and at the same time one of the most studied transition metal oxide materials for thin-film applications. The theoretically expected ...
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With nitrite solutions, at low concentrations thick films of Fe304 are formed. When the conce~ltratio~l of nitrite is increased to about 0.1 N a thin film of y-Fe203, possibly containing some yFeO(OH), is formed (I). ... magnetite films of sufficient thickness to be visible are formed (9). I . 288 CANADIAN JOURNAL OF CHEMISTRY. VOL. 37, 1959
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Gold conjugated-magnetite nanoparticles for magnetic concentration towards reproducibility and repeatability of SERS measurements. ... have found a relative standard deviation (RSD) of 0.076 for the SERS substrate based on the magnetic-assembled film and 0.179 for the conventional drop-cast film using R6G as a probe.
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Magnetite (Fe 3 O 4) nanoparticles (NPs) have attracted considerable interest as a result of their attractive properties, such as their strong magnetic moment, …
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Ge concentration in the films ranged from 0 to 14 at % with the use of different Ge chips. The X-ray diffraction result revealed that as-deposited films were …
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The equilibrium time from the adsorption studies was found to be less than 240min for both film and bead forms while the rate of Cu 2+ removal decreased as the initial Cu 2+ concentration increased. In addition, CMC-g-CMPVA film loaded with Fe 3 O 4 /SiO 2 nanoparticles was the best adsorbent with maximum adsorption capacity of …
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Magnetite is the most common and utilized form of naturally occurring iron oxides, with the chemical formula Fe 3 O 4 [32].It is characterized by a crystalline cubic inverse spinel structure, in which ferrous ions occupy half of the octahedral lattice sites and ferric ions occupy the other half of the octahedral lattice sites and all the tetrahedral …
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The magnetite thin films were annealed in the air to be converted to maghemite ones through oxidation, which 3 5 was obtained manifested CO gas sensitivity. in the CO gas sensitivity at the operation temperature of 85 C, when the thin films were annealed at 300 C. = Index Terms—Ferrite thin film, gas sensor, magnetite, ultrasound-enhanced ...
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Film composite materials were obtained using atactic polystyrene (М n = 1.4 × 10 5, M w /M n = 1.64; Aldrich, Germany) and bentonite (Sigma-Aldrich, United States) modified with magnetite.To obtain magnetized clay, an aqueous solution containing iron chloride and sulfate at a Fe 3+ /Fe 2+ molar ratio of 2 : 1 was prepared, and bentonite …
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The Fe concentration gradually decreased from the inner steel to the LDH film, so that a transition zone occurred in BSP-3 h. In contrast, no transition zone existed in NATSP-3 h, but the Fe concentration sharply decreased across the interface between steel and the LDH film, indicating that the existence of Fe 3 O 4 inhibited the dissolution …
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Hence, we believe that more attention should be paid to this issue. In this study, magnetite nanoparticle dispersions with two different average sizes but with very similar particle size distributions were prepared. We report on the role of size and concentration of the nanoparticles on SAR under various AMF parameters.
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Nevertheless, the carrier concentration of Co-NiO films reduced at the concentration of Co higher than 0.1 M. This result corresponds to the increase of resistivity.
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When 2,2'-bipyridyl was added to the LEP process, basically metal deficient magnetite (Fe3(1-8)O4) film was deposited on a substrate. According to XRD and CEMS studies, the nonstoichiometry (38) of the LEP film depends on the concentration of 2,2'-bipyridyl, which could form a complex only with Fe2+.
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Iron oxide nanoparticles are available in two common phases, namely magnetite (Fe3O4) and maghemite (Fe2O3). Upon exposure to oxygen atoms, the magnetite phase readily oxidizes into the maghemite phase with the partial conversion of ferrous ions into ferric ions. We report on the approach to determine the ratio of …
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The NMag–CS films were prepared by casting methodology. Magnetite nanoparticles were dispersed in chitosan solution sing ultrasound radiation (chitosan was solubilized in 7% of acetic acid solution). The mass ratios between chitosan and magnetite were fixed in 1:1 mass ratio, with the addition of the crosslinker solution (25% …
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Another important parameter to take into account is the pH of the solution. To study this effect, the pH of the solution was adjusted from 6 to 9; lower pHs favor partial dissolution of magnetite ...
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In particular, we could dissolve oxide films of 75 μm thickness from a PHWR reactor system. Also, we evaluated the dissolution capability of N 2 H 4 /H + /Cu + on magnetite. Experimental approaches were based on (1) a parametric study of all concentrations of all the chemical reagents and a kinetic study of magnetite …
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The global production of magnetite iron ore in 2015 is 583 million tons, which accounts for 28% of the total iron ore production. It is time to come up with an idea to use lower-cost iron ores with sufficient reserves for …
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Fig. 1 depicts the synthesis of magnetite magnetic nanoparticles (MNP) and AuMNP conjugates. MNP were synthesized by the coprecipitation method following Yang et al. [14] with slight modifications. Briefly, 5 mL 0.001 mol/L IP 6 were added in 10 mL H 2 O and this solution was heated to 80 °C under agitation. To this solution, it was added a …
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Water takes part on the oxidation processes of magnetite, the oxidation/phase transformation of Fe3O4-np is intensified in films with more bilayers, since more water is included in those films.
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The magnetite (Fe3O4) phase was observed at 1.4 mM, with preferred orientation along the (220) plane, under as-deposited and annealed conditions. The rest of the concentration range we studied results in the inclusion of small traces of maghemite (γ-Fe2O3) along with magnetite under all the preparation conditions.
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TEM images of the synthesized sample are shown in three various concentrations in Fig. 1.As seen in these images, mean diameter of the synthesized particles is 7.28, 7.30 and 7.23 nm at sample concentrations of 500, 2000 and 3000 μg Fe/cc, respectively.As is predicted, the ferrofluid concentration has not a significant …
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