Characterization of tetraethylene glycol passivated iron nanoparticles

Nunes, Eloiza da Silva; Viali, Wesley Renato; Silva, S. W. da; Coaquira, J. A. H.; Garg, V. K.; Oliveira, A. C.; Morais, P.C.; Júnior, Miguel Jafelicci

doi:10.1016/j.apsusc.2014.07.154

Cited by 13 publications

(5 citation statements)

References 47 publications

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“…High-resolution transmission electron microscopy (HRTEM) of Fe-NF, OD Fe-NF, and ED-Fe revealed regions with inter-planar (d-) spacings of 2.05 Å (Figure 5h-j). [25] These could be ascribed to the Fe(110) facet, and their predominance is consistent with the XRD data. Differently-oriented crystallite domains of Fe(110) were also observed, indicating the presence of grain boundaries.…”

Section: Characterization Of Iron Nanoflakes Oxide-derived Iron Nanof...supporting

confidence: 83%

Mechanistic Insights into the Selective Electroreduction of Crotonaldehyde to Crotyl Alcohol and 1‐Butanol

2021

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The electroreduction of crotonaldehyde, which can be derived from the aldol condensation of acetaldehyde (sustainably produced from CO 2 reduction or from biomass ethanol), is potentially a carbon-neutral route for generating high-value C 4 chemicals such as crotyl alcohol and 1-butanol. Developing functional catalysts is necessary toward this end. Herein, the electrocatalytic conversion of crotonaldehyde to crotyl alcohol and 1-butanol was achieved in 0.1 m potassium phosphate buffer electrolyte (pH = 7). More importantly, the mechanisms and structure-activity relationships of these transformations were elucidated. Crotyl alcohol was formed on oxide-derived Ag at À 0.75 V versus the reversible hydrogen electrode (RHE) with a faradaic efficiency (FE) of 84.3 % (reactant conversion after 75 min electrolysis = 9.8 %), which is 1.6 times higher than that on polished Ag foils. The coordinatively-unsaturated sites on oxide-derived Ag surfaces were proposed to facilitate crotonaldehyde adsorption via its oxygen atom in order to promote crotyl alcohol formation. On electrodeposited Fe nanoflakes, crotonaldehyde could be reduced to 1-butanol with an outstanding FE of 60.6 % (reactant conversion after 75 min electrolysis = 9.4 %) at À 0.70 V vs. RHE. This is nearly 3 times higher than the FE of 1-butanol observed on polished Fe foils at the same potential. More strikingly, the corresponding partial current density of 1-butanol was À 9.19 mA cm À 2 , which is 43 times higher than that on Fe foils. The presence of tensile strains and grain boundaries on the Fe nanoflakes were elucidated and suggested to activate a concerted reduction of the C=O and C=C bonds in crotonaldehyde to produce 1butanol selectively.

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Section: Characterization Of Iron Nanoflakes Oxide-derived Iron Nanof...supporting

confidence: 83%

Mechanistic Insights into the Selective Electroreduction of Crotonaldehyde to Crotyl Alcohol and 1‐Butanol

2021

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“…Some NPs present magnetic characters that are composed of transition metals oxides, presenting the formula of MFe 2 O 4 , where M is a divalent metal, such as cobalt (CoFe 2 O 4 ) and zinc (ZnFe 2 O 4 ) [6][7][8]. Ferrites can be synthesized by multiple methods, i.e., solid-state reaction [9], polymeric precursors [10], thermal decomposition [11], hydrothermal [12], etc. The polymeric precursor method involves a sol-gel process, which starts with precursors in the liquid state, followed by the formation of the sol phase, which is a colloidal suspension.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and evaluation of antibacterial activity of transition metal oxyde nanoparticles

Morais

Pancotti

Souza

et al. 2021

J Mater Sci: Mater Med

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Nanoparticles (NPs) have a wide range of applications in various areas. For health application, cytotoxicity tests are used to ensure its efficiency and safety. In this paper, ZnFe2O4, CoFe2O4, Zn0.5Co0.5Fe2O4 NPs were synthesized, characterized and their antibacterial properties were evaluated. The Sol-Gel method was used to synthesize the NPs. Their electronic and crystallographic structures were characterized by Fourier Transform Infrared Spectroscopy Analysis (FTIR), X-ray fluorescence (XRF), X-Ray Diffraction (XRD), and Transmission Electron Microscopy (TEM). To perform the antibacterial evaluation, ferrites were dispersed through nanoemulsion to prevent the crystals from accumulating together. Then the evaluation was performed through microdilution in a 96-well plate and diffusion in agar disc in contact with 3 different strains of Staphylococcus aureus and Escherichia coli. It demonstrated that the Sol-Gel method was efficient to synthesize NPs with suitable sizes for health application. All synthesized NPs showed the inhibition of bacterias with different concentrations used.

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“…There are 33 available photochemical peaks observed in the sample. It is considered that the presence of photochemical are mainly responsible for synthesizing metallic nanoparticles 27 [28][29][30][31][32] . A detailed list of the compounds and chromatogram are attached with Supplementary Information.…”

Section: Resultsmentioning

confidence: 99%

Cow dung extract mediated green synthesis of zinc oxide nanoparticles for agricultural applications

Javed

Tripathi²,

Mishra³

et al. 2022

Sci Rep

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In the present study, zinc oxide nanoparticles (ZnO) were synthesized using cow dung extract to apply sustainable agriculture from rural resources. Studies on their antibacterial potential against E. coli DH 5 alpha indicated lower antimicrobial activities than the bulk Zn and commercial Zn nanoparticles. Compared with control and commercial ZnO nanoparticles, the maximum seed germination, root length, and shoot length were observed after the priming of synthesized ZnO NPs. This study suggests that ZnO may significantly increase seed germination and have lower antimicrobial potential. Further, the lower in-vitro cellular leakage and reactive oxygen species (ROS) production provided new hope for using cow dung extract mediated nanoparticles for agricultural and industrial applications.

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Characterization of tetraethylene glycol passivated iron nanoparticles

Cited by 13 publications

References 47 publications

Mechanistic Insights into the Selective Electroreduction of Crotonaldehyde to Crotyl Alcohol and 1‐Butanol

Mechanistic Insights into the Selective Electroreduction of Crotonaldehyde to Crotyl Alcohol and 1‐Butanol

Synthesis, characterization, and evaluation of antibacterial activity of transition metal oxyde nanoparticles

Cow dung extract mediated green synthesis of zinc oxide nanoparticles for agricultural applications

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