A new route of emulsifier-free emulsion polymerization for the preparation of polymer coated magnetite nanoparticles

Nguyen, Quan Hai; Quyen, Duong Hong; Hoang, Thai

doi:10.2478/s13536-013-0172-y

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…The sample has a characteristic absorption band of the Fe–O bond of Fe 3 O 4 at 568 cm –1 . , The signal appeared at around 1130 cm –1 , which corresponds to the alkylsulfonium group. The bands at ∼1643 cm –1 correspond to iron oxide and the alkylsulfonium group too, while the band at 1736 cm –1 corresponds to the remaining H 2 SO 4 . , The O–H stretching bands from physisorbed molecular water can be observed at 3386 cm –1 , while the signals at 2957 and 2854 cm –1 belong to the C–H stretching signal of the inhibitor aliphatic group and Fe 3 O 4 . , The C–H scissoring of the alkyl chain signals appears at 1459 cm –1 .…”

Section: Resultsmentioning

confidence: 98%

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Investigation of Sulfonium-Iodide-Based Ionic Liquids to Inhibit Corrosion of API 5L X52 Steel in Different Flow Regimes in Acid Medium

et al. 2022

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The present work deals with the corrosion inhibition mechanism of API 5L X52 steel in 1 M H2SO4 employing the ionic liquid (IL) decyl(dimethyl)sulfonium iodide [DDMS+I–]. Such a mechanism was elicited by the polarization resistance (R p), potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS) techniques, both in stationary and dynamic states. The electrochemical results indicated that the corrosion inhibition was controlled by a charge transfer process and that the IL behaved as a mixed-type corrosion inhibitor (CI) with anodic preference. The experimental results revealed maximal inhibition efficiency (IE) rates up to 93% at 150 ppm in the stationary state, whereas in turbulent flow, the IE fell to 65% due to the formation of microvortexes that promoted higher desorption of IL molecules from the surface. The Gibbs free energy of adsorption (ΔG°ads) value of −34.89 kJ mol–1, obtained through the Langmuir isotherm, indicated the formation of an IL monolayer on the metal surface by combining physisorption and chemisorption. The surface analysis techniques confirmed the presence of Fe x O y , FeOOH, and IL on the surface and showed that corrosion damage diminished in the presence of IL. Furthermore, the quantum chemistry calculations (DFT) indicated that the iodide anion hosted most of the highest occupied molecular orbital (HOMO), which eased its adsorption on the anodic sites, preventing the deposition of sulfate ions on the electrode surface.

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Section: Resultsmentioning

confidence: 98%

“… 71 , 72 The O–H stretching bands from physisorbed molecular water can be observed at 3386 cm –1 , while the signals at 2957 and 2854 cm –1 belong to the C–H stretching signal of the inhibitor aliphatic group and Fe 3 O 4 . 73 , 74 The C–H scissoring of the alkyl chain signals appears at 1459 cm –1 .…”

Section: Resultsmentioning

confidence: 99%

Investigation of Sulfonium-Iodide-Based Ionic Liquids to Inhibit Corrosion of API 5L X52 Steel in Different Flow Regimes in Acid Medium

et al. 2022

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“…Literature findings showed that FTIR spectra of magnetite, which exhibits two strong infrared absorption bands at 570 cm −1 (υ1) and 390 cm −1 (υ2), can be assigned to the Fe-O stretching mode of the tetrahedral and octahedral sites for the υ1 band and the Fe-O stretching mode of the octahedral sites for the υ2 band 22 . These main Fe-O vibration bands may differ as function of various factors related to magnetite synthesis protocol, oxidation, stoichiometry of magnetite (Fe(II)/Fe(III) ratios), etc [23][24][25][26][27][28][29][30][31] . As an example, FTIR investigation of hydrothermally synthetized magnetite showed the two absorption bands at 584 cm −1 and 442.03 cm −1 respectively 32 .…”

Section: Resultsmentioning

confidence: 99%

Iron phthalocyanine-sensitized magnetic catalysts for BPA photodegradation

Neamţu

Nădejde

Brinza

et al. 2020

Sci Rep

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the catalytic behavior of iron phthalocyanine (fepc)-sensitized magnetic nanocatalysts was evaluated for their application in the oxidative treatment of Bisphenol A (BpA) under mild environmental conditions. two types of fepc (fe(ii)pc and fe(iii)pc), which are highly photosensitive compounds, were immobilized on the surface of functionalized magnetite. the nanomaterials were characterized by high resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (ftiR) and thermogravimetric analyses (tGA). the generation of singlet oxygen by nanomaterials was also investigated. In the presence of UVA light exposure (365 nm) and 15 mM H 2 o 2 , the M@Fe(III)Pc photocatalyst gave the best results; for a catalyst concentration of 2.0 g L − 1 , around 60% BPA was removed after 120 min of reaction. These experimental conditions were further tested under natural solar light exposure, for which also M@fe(iii)pc exhibited enhanced oxidative catalytic activity, being able to remove 83% of BPA in solution. The water samples were less cytotoxic after treatment, this being confirmed by the MCF-7 cell viability assay. Emerging recalcitrant organic pollutants received extensive attention over the years, since they are difficult to remove using conventional technologies. Continuous efforts are made to find improved solutions for fighting against and for diminishing environmental pollution. Endocrine disruptive chemicals (EDC) are a class of hazardous persistent pollutants exhibiting numerous harmful effects, able to induce subtle and irreversible changes in living organisms, even in concentrations of few parts per billion 1,2. Bisphenol A (BPA) is an EDC that remains a major water contaminant, since its production in the 1950s. Since then, BPA become a well-established model compound for persistent micropollutants. Although found in low concentration in water, its removal proved to be unsuccessful using conventional water treatment approaches, such as chlorination and ozonation, processes that also exhibit several drawbacks 3. Promising alternatives, such as photocatalysis 1,4-6 , were found to be very efficient and versatile. For instance, photocatalysis involving dye-sensitization represents an eco-friendly approach with great potential for very efficient removal of persistent hazardous pollutants from waters. Singlet oxygen, a reactive oxygen species (ROS), has proved to be an extremely effective agent in the oxidation of emerging pollutants, due to its high oxidation ability. Organic phthalocyanines (Pcs) are the synthetic analogues of natural porphyrine compounds 7. Discovered in 1928, Pcs, possessing a two-dimensional geometry and a ring system consisting of 18 π-electrons, are composed of four isindole units linked by nitrogen atoms. Due to the large, aromatic, macrocyclic structure of Pc, a variety of metals (Me), such as Fe 8-10 , Zn 11,12 , Cu 13,14 , Mn, Co, Ni 15,16 , Si 17 , Ru 18 , can be bonded inside the cycle of Pc, substituting the two hydrogen atoms. These ...

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“…For characterizing the samples, TGA data were used for estimating both polymer contents and polymer‐shell thickness. Then, the results were correlated with magnetization . Another interesting work was reported by Chen and co‐workers .…”

Section: Combination Of Thermal Gravimetric Analysis and Magnetizationmentioning

confidence: 85%

TGA and magnetization measurements for determination of composition and polymer conversion of magnetic hybrid particles

Tenório‐Neto

Jamshaid

Eissa

et al. 2015

Polymers for Advanced Techs

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International audienceMagnetic hybrid colloidal particles can be characterized using various techniques and numerous tools leading generally to particles size, size distribution, and electrokinetic properties. However, the chemical composition of these hybrid particles can be estimated using thermal gravimetric analysis (TGA). More interestingly, the combination of this quantitative technique with the magnetization measurement leads not only to chemical composition but also to the overall polymerization conversion and more precisely to the polymerization conversion on the seed particles. In fact, the TGA performed on dried magnetic particles leads to exact organic/inorganic chemical composition. Regarding the magnetization, the amount of magnetic material can be deduced, and consequently, the amount of non-magnetic material can be also estimated. Thus, TGA and magnetization measurements are considered as complementary techniques for characterization of magnetic hybrid colloidal particles

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A new route of emulsifier-free emulsion polymerization for the preparation of polymer coated magnetite nanoparticles

Cited by 6 publications

References 15 publications

Investigation of Sulfonium-Iodide-Based Ionic Liquids to Inhibit Corrosion of API 5L X52 Steel in Different Flow Regimes in Acid Medium

Investigation of Sulfonium-Iodide-Based Ionic Liquids to Inhibit Corrosion of API 5L X52 Steel in Different Flow Regimes in Acid Medium

Iron phthalocyanine-sensitized magnetic catalysts for BPA photodegradation

TGA and magnetization measurements for determination of composition and polymer conversion of magnetic hybrid particles

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