Polyvinyl amine as a modified and grafted shell for Fe3O4 nanoparticles: As a strong solid base catalyst for the synthesis of various dihydropyrano[2,3-c]pyrazole derivatives and the Knoevenagel condensation

Arghan, Maryam; Koukabi, Nadiya; Kolvari, Eskandar

doi:10.1016/j.jscs.2018.05.008

Cited by 19 publications

(5 citation statements)

References 38 publications

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“…For the case core−shell SPN@PAM and SPN-PAM, the presence of PAM was proven by the appearance of strong peaks at 1640.65 and 1612.99 cm −1 , which can be attributed to amidic CO stretching vibration and N−H bending vibration, respectively. 34 Additionally, the broad peak at 3000−3500 cm −1 due to the stretching vibration of N−H groups also indicated the presence of PAM.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Surface-Functionalized Superparamagnetic Nanoparticles (SPNs) for Enhanced Oil Recovery: Effects of Surface Modifiers and Their Architectures

et al. 2019

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Superparamagnetic nanoparticles (SPNs) have been considered as one of the most studied nanomaterials for subsurface applications, including in enhanced oil recovery (EOR), due to their unique physicochemical properties. However, a comprehensive understanding of the effect of surface functionalization on the ability of the nanoparticles to improve secondary and tertiary oil recoveries remains unclear. Therefore, investigations on the application of bare and surface-functionalized SPNs in EOR using a sand pack were carried out in this study. Here, the as-prepared SPNs were functionalized using oleic acid (OA) and polyacrylamide (PAM) to obtain several types of nanostructure architectures such as OA-SPN, core–shell SPN@PAM, and SPN-PAM. Based on the result, it is found that both the viscosity and mobility of the nanofluids were significantly affected by not only the concentration of the nanoparticles but also the type and architecture of the surface modifier, which dictated particle hydrophilicity. According to the sand pack tests, the nanofluid containing SPN-PAM was able to recover as much as 19.28% of additional oil in a relatively low concentration (0.9% w/v). The high oil recovery enhancement was presumably due to the ability of suspended SPN-PAM to act as a mobility control and wettability alteration agent and facilitate the formation of a Pickering emulsion and disjoining pressure.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Surface-Functionalized Superparamagnetic Nanoparticles (SPNs) for Enhanced Oil Recovery: Effects of Surface Modifiers and Their Architectures

et al. 2019

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“…The magnetic behavior of Fe 3 O 4 ‐CNT and Fe 3 O 4 ‐CNT‐SO 3 H were assessed by VSM at room temperature. The curves in Figure indicate that the values of the saturation magnetization of Fe 3 O 4 ‐CNT and Fe 3 O 4 ‐CNT‐SO 3 H (39.04 and 24.09 emu g −1 , respectively) are below that of Fe 3 O 4 nanoparticles (61.60 emu g −1 ) which are pertinent to the presence of nonmagnetic species such as CNT and SO 3 H groups in the nanocomposite. Nevertheless, the catalyst can still be quickly and efficiently disengaged from the reaction system by an outer magnetic force.…”

Section: Resultsmentioning

confidence: 99%

Magnetic carbon nanotube as a highly stable and retrievable support for the heterogenization of sulfonic acid and its application in the synthesis of 2‐(1H‐tetrazole‐5‐yl) acrylonitrile derivatives

Akbarzadeh

Koukabi

Hosseini

2020

Journal of Heterocyclic Chem

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In the present study, a novel magnetic carbon nanotube functionalized by chlorosulfonicacid (Fe3O4‐CNT‐SO3H) with nanotube morphology decorated by the spherical nanoparticles was prepared, characterized and introduced as a retrievable magnetic heterogeneous nanocatalyst for green synthesis a variety of 2‐(1H‐tetrazole‐5‐yl) acrylonitrile via multicomponent domino Knoevenagel condensation/ 1,3‐dipolar cycloaddition reaction between aromatic aldehydes, malononitrile, and sodium azide under solvent free conditions. The catalyst was magnetically separated from the reaction system by an outer magnetic force and recycled up to five runs without a remarkable loss in its efficiency. The as‐preparedacidic magnetic nanocomposite was characterized by different techniques inclusive Fourier transform infrared, thermogravimetric analysis, energy dispersive X‐ray, field emission scanning electron microscopy, X‐ray diffraction, vibrating sample magnetometry, CHNS elemental analysis, and acid‐base titration. Easy workup, affordability, elimination of volatile and toxic solvents, and high yield of products are some merits of this protocol.

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“…[40] As can be seen, the amount of organic moieties bonded on the surface of the MNPs is relatively high, which indicates the successful construction of the dendrimer on the surface. [42] A closer inspection of the TGA curve of MNP@PAMAM-Co shows slightly lower thermal stability after the immobilization of cobalt, which can be due to the interaction of the cobalt species with the ligands [43] and the catalytic effect of them in the decomposition of the dendritic structure. [42] A closer inspection of the TGA curve of MNP@PAMAM-Co shows slightly lower thermal stability after the immobilization of cobalt, which can be due to the interaction of the cobalt species with the ligands [43] and the catalytic effect of them in the decomposition of the dendritic structure.…”

Section: Thermogravimetric Analysismentioning

confidence: 97%

“…[41] The final weight loss (about 630-680°C) is attributed to the degradation of the PVAm polymer chains. [42] A closer inspection of the TGA curve of MNP@PAMAM-Co shows slightly lower thermal stability after the immobilization of cobalt, which can be due to the interaction of the cobalt species with the ligands [43] and the catalytic effect of them in the decomposition of the dendritic structure. [44] However, this thermal stability is very acceptable for the catalytic application in C-C coupling reactions, which are carried out at high temperatures.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Cobalt supported on dendronized magnetic nanoparticles: A new highly efficient and recyclable catalyst for the Mizoroki–Heck cross‐coupling reaction

Arghan

Koukabi

Kolvari

2019

Applied Organom Chemis

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Funding information Semnan UniversityPolyamidoamine (PAMAM) is one of the most interesting types of hyperbranched polymers that carry a large number of amino groups on its surface. PAMAM has gained significant attention from synthetic organic chemists due to its structural characteristics, controllable structure, inner porosity, and ability to trap a wide range of ions and molecules. So, in this work, the PAMAM dendrimer was synthesized, grafted onto the surface of magnetite nanoparticles, and the resulting hybrid nanoparticles were then employed as suitable host for immobilizing cobalt nanoparticles. The newly developed catalyst was well characterized by Fourier transform-infrared, X-ray diffraction, thermogravimetric analysis, field emission-scanning electron microscopy, transmission electron microscopy, atomic absorption spectroscopy, element mapping and energy-dispersive X-ray analysis. The efficiency of the as-prepared nanocatalyst was evaluated for the Mizoroki-Heck crosscoupling reactions. The MNP@PAMAM-Co represented perfect catalytic efficiency and high selectivity for the Mizoroki-Heck cross-coupling reaction compared with previously reported catalysts. The catalyst separation from the reaction mixture was easily achieved with the assistance of an external magnetic field, and its recycling was also investigated for five consecutive runs. Hot filtration confirmed no leaching of the active metal during the Heck coupling.

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Polyvinyl amine as a modified and grafted shell for Fe3O4 nanoparticles: As a strong solid base catalyst for the synthesis of various dihydropyrano[2,3-c]pyrazole derivatives and the Knoevenagel condensation

Cited by 19 publications

References 38 publications

Surface-Functionalized Superparamagnetic Nanoparticles (SPNs) for Enhanced Oil Recovery: Effects of Surface Modifiers and Their Architectures

Surface-Functionalized Superparamagnetic Nanoparticles (SPNs) for Enhanced Oil Recovery: Effects of Surface Modifiers and Their Architectures

Magnetic carbon nanotube as a highly stable and retrievable support for the heterogenization of sulfonic acid and its application in the synthesis of 2‐(1H‐tetrazole‐5‐yl) acrylonitrile derivatives

Cobalt supported on dendronized magnetic nanoparticles: A new highly efficient and recyclable catalyst for the Mizoroki–Heck cross‐coupling reaction

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