Study of the surface chemistry and morphology of single walled carbon nanotube–magnetite composites

Marquez-Linares, F.; Uwakweh, O. N. C.; Lopez, N. Ubierna; Chavez, Ermides; Polanco, R.; Morant, Carmen; Sanz, J. M.; Elizalde, E.; Neira, Carlos; Nieto, Santander; Roque‐Malherbe, R.

doi:10.1016/j.jssc.2011.01.017

Cited by 7 publications

(5 citation statements)

References 74 publications

(177 reference statements)

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“…As was previously mentioned, the information obtained during the characterization guarantee that the adsorption space surface in dehydrated NPs is covered by oxygen anions and unsaturated M bonds. Thereafter, the finding made with the DRIFTS data are consistent with this information, since it indicated that CO 2 molecules were adsorbed on two adsorption states, one of them a state where the CO 2 molecule is physically adsorbed, fundamentally over the oxygen, and another adsorption state where the CO 2 molecule interacts with the M 2+ (Ni 2+ , Zn 2+ , and Cd 2+ ) cations located in the framework, which act as electron-accepting Lewis acid sites. , Lewis acid–base reactions result in more or less stable adducts whose steadiness can be explained by the model of the hard and soft acids and bases scheme, i.e., an acid–base adduct is produced by the charge transfer from the highest-occupied molecular orbital of the base to the lowest-unoccupied molecular orbital of the acid …”

Section: Resultssupporting

confidence: 64%

Structural Effects and Interactions of Carbon Dioxide Molecules Adsorbed on Ni, Zn, and Cd Nitroprussides

et al. 2011

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A thorough structural characterization of the synthesized Ni-, Zn-, and Cd-nitroprussides (NPs) with X-ray diffraction (XRD), thermogravimetric analysis, diffuse reflectance infrared Fourier transform spectrometry (DRIFTS), M€ ossbauer spectroscopy, and magnetic measurements was performed. However, the innovative part of the research was the study of the structural effects and the interactions of the CO 2 molecule with the Ni-, Zn-, Cd-NP frameworks. DRIFTS of adsorbed molecules, high pressure adsorption, and in situ XRD adsorption experiments were performed. The DRIFTS spectra displayed peaks assigned to CO 2 physical adsorption and the formation of adducts (M 2+ 3 3 3 OdCdO). The fitting of the adsorption data to the DubininÀRadushkevich equation and a Langmuir-type equation for volume filling allowed the calculation of the micropore volume and the isosteric heats of adsorption. The calculated parameters indicated an unusual behavior of the adsorption process in Cd-NP at high pressure. This fact was caused by the interaction of CO 2 molecules with the framework cations and the small adsorption space of Cd-NP. The Ni-and Zn-NPs behaved normally. The Pawley fitting of the XRD profiles of the dehydrated materials and under CO 2 adsorption indicated that in both cases Ni-NP, Zn-NP, and Cd-NPs displayed the Fm3m, R3, and Pnma space groups, respectively. The dehydrated samples demonstrated a change in the cell parameters. However, only Cd-NP presented a noticeable variation of its cell parameters under CO 2 adsorption. This fact was linked to the unusual behavior of the adsorption process in Cd-NP. Additionally, was shown that dehydrated Ni-, Zn-, and Cd-NPs can store 27, 22, and 15 wt % of CO 2 at 298 K and 9 atm., respectively. Then, Ni-and Cd-NPs are excellent for CO 2 storage, and Cd-NP is good for gas cleaning.

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Section: Resultssupporting

confidence: 64%

Structural Effects and Interactions of Carbon Dioxide Molecules Adsorbed on Ni, Zn, and Cd Nitroprussides

et al. 2011

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“…Although 295 K data were collected for all samples, they were not useful because some of the Fe oxides were too fine‐grained to be magnetically ordered at that temperature. Such superparamagnetism has been observed in both biogenic and synthetic magnetite at particle sizes below ~13 nm, often manifested as a doublet in room temperature Mössbauer spectra (Hassett et al ., ; Vali et al ., ; Weiss et al ., ; Ambashta et al ., ; Kalska‐Szostko et al ., ; Bandhu et al ., ; Li et al ., ; Marquez‐Linares et al ., ; Starowicz et al ., ; Zając et al ., ). The magnetic field of superparamagnetic nanoparticles varies in direction faster than the inverse lifetime of the 57 Fe nuclear excited state (on the order of 10 7 s −1 ).…”

Section: Methodsmentioning

confidence: 99%

Magnetite formation from ferrihydrite by hyperthermophilic archaea from Endeavour Segment, Juan de Fuca Ridge hydrothermal vent chimneys

et al. 2014

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Hyperthermophilic iron reducers are common in hydrothermal chimneys found along the Endeavour Segment in the northeastern Pacific Ocean based on culture-dependent estimates. However, information on the availability of Fe(III) (oxyhydr) oxides within these chimneys, the types of Fe(III) (oxyhydr) oxides utilized by the organisms, rates and environmental constraints of hyperthermophilic iron reduction, and mineral end products is needed to determine their biogeochemical significance and are addressed in this study. Thin-section petrography on the interior of a hydrothermal chimney from the Dante edifice at Endeavour showed a thin coat of Fe(III) (oxyhydr) oxide associated with amorphous silica on the exposed outer surfaces of pyrrhotite, sphalerite, and chalcopyrite in pore spaces, along with anhydrite precipitation in the pores that is indicative of seawater ingress. The iron sulfide minerals were likely oxidized to Fe(III) (oxyhydr) oxide with increasing pH and Eh due to cooling and seawater exposure, providing reactants for bioreduction. Culture-dependent estimates of hyperthermophilic iron reducer abundances in this sample were 1740 and 10 cells per gram (dry weight) of material from the outer surface and the marcasite-sphalerite-rich interior, respectively. Two hyperthermophilic iron reducers, Hyperthermus sp. Ro04 and Pyrodictium sp. Su06, were isolated from other active hydrothermal chimneys on the Endeavour Segment. Strain Ro04 is a neutrophilic (pH opt 7-8) heterotroph, while strain Su06 is a mildly acidophilic (pH opt 5), hydrogenotrophic autotroph, both with optimal growth temperatures of 90-92 °C. Mössbauer spectroscopy of the iron oxides before and after growth demonstrated that both organisms form nanophase (<12 nm) magnetite [Fe3 O4 ] from laboratory-synthesized ferrihydrite [Fe10 O14 (OH)2 ] with no detectable mineral intermediates. They produced up to 40 mm Fe(2+) in a growth-dependent manner, while all abiotic and biotic controls produced <3 mm Fe(2+) . Hyperthermophilic iron reducers may have a growth advantage over other hyperthermophiles in hydrothermal systems that are mildly acidic where mineral weathering at increased temperatures occurs.

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“…Therefore, the third sextet is attributed to the Fe ions located in the surface region of the studied nanoparticles. According to previous research, [37][38][39] the B values on iron nuclei in the surface region of nanoparticles are significantly decreased. At the same time, the observed quadrupole splitting (QS = −0.26 (2) mm/s) can be explained assuming that the iron atoms located in the surface region are immersed in a non-zero electric field gradient which is an effect on the broken cubic symmetry.…”

Section: Dovepressmentioning

confidence: 69%

“…In the case of studied MNPs, the obtained value of Ms is one of the highest described. 34,[37][38][39] Besides enhanced osteoclastogenesis, chronic bone inflammation becomes an important factor that induces bone turnover, leading to osteoporosis development. 40 Numerous proinflammatory cytokines have been implicated in the regulation of osteoblasts and osteoclasts activity, and the advantage of proinflammatory over anti-inflammatory profile has been hypothesized as an important risk factor.…”

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confidence: 99%

Fe3O4 Magnetic Nanoparticles Under Static Magnetic Field Improve Osteogenesis via RUNX-2 and Inhibit Osteoclastogenesis by the Induction of Apoptosis

Marycz¹,

Sobierajska²,

Wiglusz³

et al. 2020

IJN

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The presented study aimed to investigate the effects of Fe 3 O 4 nanoparticles and static magnetic field on osteoblast and osteoclasts' metabolic activity. Methods: Magnetic nanoparticles were prepared by a wet chemical co-precipitation process and analyzed using X-ray powder diffraction, high-resolution transmission electron microscope (HRTEM), dynamic light scattering (DLS), laser Doppler velocimetry, Raman and the Mössbauer spectroscopy. In vitro experiments were performed using MC3T3, 4B12 and RAW 264.7 cell lines. Cells were cultured in the presence of nanoparticles and with or without exposure to the magnetic field. Proteins were investigated with Western blotting and immunofluorescence and Western blot. Gene expression was analyzed with a quantitative real-time polymerase chain reaction. Results: Obtained particles were in the nano-range (average size around 50 nm) and had a spherical-like morphology. The typical hydrodynamic size was in the range 178-202 nm and Zeta potential equaled -9.51 mV. Mössbauer spectrum corresponds to the Fe +3 ions in tetrahedral (A) and Fe +3 and Fe +2 ions in octahedral (B) sites of Fe 3 O 4 . In vitro study revealed cytocompatibility and anti-inflammatory effects of fabricated nanoparticles. Furthermore, it was shown that nanoparticles combined with magnetic field exposure enhance osteogenic differentiation of MC3T3 cells by upregulation of RUNX-2 activity. Under the same experimental condition, nanoparticles and magnetic field decreased osteoclastogenesis of 4B12 by the induction of apoptosis through the mitochondrial-dependent pathway. Conclusion: Fe 3 O 4 nanoparticles together with magnetic field can be applied for the fabrication of novel biomaterials for the treatment of bone disorders related to bone loss in which a balance between bone-forming and resorbing cells is disturbed.

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Study of the surface chemistry and morphology of single walled carbon nanotube–magnetite composites

Cited by 7 publications

References 74 publications

Structural Effects and Interactions of Carbon Dioxide Molecules Adsorbed on Ni, Zn, and Cd Nitroprussides

Structural Effects and Interactions of Carbon Dioxide Molecules Adsorbed on Ni, Zn, and Cd Nitroprussides

Magnetite formation from ferrihydrite by hyperthermophilic archaea from Endeavour Segment, Juan de Fuca Ridge hydrothermal vent chimneys

<p>Fe<sub>3</sub>O<sub>4</sub> Magnetic Nanoparticles Under Static Magnetic Field Improve Osteogenesis via RUNX-2 and Inhibit Osteoclastogenesis by the Induction of Apoptosis</p>

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