Raman spectroscopy investigation of magnesium oxide nanoparticles

Dekermenjian, Maria; Ruediger, Andreas Peter; Merlen, Alexandre

doi:10.1039/d3ra04492k

Cited by 14 publications

(1 citation statement)

References 35 publications

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“…However, given the high weight gain ( Figure 5 ) and the high degree of oxidation detected ( Table 3 ), we consider that the alloy surface has mostly oxidized after the corrosion test. Interestingly, several main Raman modes at 280, 446, 1088, and 1120 cm −1 are reported when the particle size is between 30 and 3000 nm [ 30 , 31 ]. Such Raman modes are clearly identified in the Raman spectrum obtained in the REF sample and they are indicated by dotted lines.…”

Section: Resultsmentioning

confidence: 99%

Eco-Friendly Sol–Gel Coatings with Organic Corrosion Inhibitors for Lightweight AZ61 Alloy

Domínguez-Martínez,

López-Sánchez,

García-Galván

et al. 2024

Gels

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The latest advances in technology and materials science have catalyzed a transformative shift towards the adoption of environmentally conscious and lightweight materials across key sectors such as aeronautics, biomedical, and automotive industries. Noteworthy among these innovations are the magnesium-aluminum (Mg-Al) alloys employed in aeronautical applications, contributing to the overall reduction in aircraft weight and subsequently diminishing fuel consumption and mitigating atmospheric emissions. The present work delves into a study of the anti-corrosive properties inherent in various sol-gel coatings, leveraging a range of environmentally friendly corrosion inhibitors, specifically tailored for samples of the AZ61 alloy. Methodologically, the work involves the synthesis and application of sol-gel coatings on AZ61 alloy containing eco-friendly inhibitors: L-cysteine, N-acetyl-cysteine, curcumin and methylene blue. Subsequently, an accelerated corrosion test in a simulated saline environment is performed. Through microstructural and compositional analyses, the best inhibitors responses are achieved with inhibitors containing S, N heteroatoms and conjugated double bonds in their structure, probably due to the creation of a continuous MgCl2 layer. This research contributes to the ongoing discourse on protective eco-coatings, aligning with the broader paradigm shift towards sustainable and lightweight materials in key industries.

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Section: Resultsmentioning

confidence: 99%

Eco-Friendly Sol–Gel Coatings with Organic Corrosion Inhibitors for Lightweight AZ61 Alloy

Domínguez-Martínez,

López-Sánchez,

García-Galván

et al. 2024

Gels

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Waste Plastic‐Derived FeMo@MgO/CNTs Nanocomposites for High‐Performance Supercapacitor Applications

Aboul‐Enein,

Yousif,

Awadallah

et al. 2024

ChemistrySelect

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Multiwalled carbon nanotubes (MWCNTs) were prepared from low‐density polyethylene (LDPE) plastic waste using FeMo(x)@MgO catalysts with several FeMo contents (x=10, 30, and 50 %). Pyrolysis of waste LDPE and growth of CNTs over FeMo/MgO catalysts were performed at 450 and 750 °C, respectively. The results indicated that FeMoO4, Fe2(MoO4)3, MgFe2O4, MgMoO4, and Mg2Mo3O11 species were the main components of the calcined catalyst containing 50 %FeMo. However, free monometallic iron oxides and bimetallic oxides (MgFe2O4, and MgMoO4) were the components of the calcined catalyst containing 10 %FeMo. The FeMo content was found to correlate with the yield and quality of the carbon product. TEM images of the spent catalysts proved the formation of MWCNTs at all FeMo contents. The FeMo(30)/MgO catalyst was the most active in CNT production. Raman spectroscopy results proved the generation of the best quality MWCNTs at 30 %FeMo content. XRD analysis of the spent catalysts demonstrated that nanocomposite of Fe3C, Mo2C, MgO, and MWCNTs (FeMoC(x)@MgO/CNTs) was successfully synthesized. The electrochemical performance of FeMoC(x)@MgO/CNTs composites was evaluated as low‐cost supercapacitor nanoelectrodes. Large specific capacity values of 806, 978, and 1180 F g were achieved at the current density of 0.1 A g using nanocomposites with 10, 30, and 50 %FeMo contents, respectively.

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Electrolyte‐Salts Regulated Hydrogen‐Bonding Configuration and Interphase Formation Achieving Highly Stable Anode for Rechargeable Aqueous Sodium‐Ion Batteries

Wang,

Zhao,

Zhang

et al. 2024

Small

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Hydrogen evolution reactions that cause the alkalization of aqueous electrolytes generally frustrate the structural stability and cycling performance of NaTi2(PO4)3/C anode material for rechargeable aqueous sodium‐ion batteries (ASIBs). Herein, a novel highly concentrated electrolyte with a large hydrogen‐evolution overpotential and hydroxide‐capture ability is rationally established by incorporating a bifunctional Mg(Ac)2 additive into a concentrated NaAc aqueous solution. The highly concentrated electrolyte salts (4m NaAc+3m Mg(Ac)2) favor regulation on hydrogen‐bonding configurations and kinetically shift the hydrogen evolution potential to a lower value of −1.37 V (vs Ag/AgCl). The Mg(Ac)2 additive plays particular roles in spontaneously capturing hydroxide ions generated during hydrogen evolution reactions on anode surfaces and simultaneously forming a protective Mg(OH)2‐like interphase. As a result, the unique electrolyte significantly improves the structural stability and cycling performance of NaTi2(PO4)3/C anode (94.8% capacity retention after 100 cycles at 100 mA·g−1). The effect of salt concentration on hydrogen bonding configurations of aqueous electrolytes is investigated with Raman spectroscopy and FTIR spectroscopy. The interphase is identified by coupling EDS mapping, X‐ray photoelectron spectroscopy, and X‐ray diffraction. This work provides a new strategy for improving the cycling stability of aqueous sodium‐ion batteries.

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Raman spectroscopy investigation of magnesium oxide nanoparticles

Abstract: We investigate Raman spectra (100 cm−1 to 3900 cm−1) of magnesium oxide nanoparticles with nominal sizes of 10 nm, 20 nm, 40 nm, 50 nm, and 300 nm.

Cited by 14 publications

References 35 publications

Eco-Friendly Sol–Gel Coatings with Organic Corrosion Inhibitors for Lightweight AZ61 Alloy

Eco-Friendly Sol–Gel Coatings with Organic Corrosion Inhibitors for Lightweight AZ61 Alloy

Waste Plastic‐Derived FeMo@MgO/CNTs Nanocomposites for High‐Performance Supercapacitor Applications

Electrolyte‐Salts Regulated Hydrogen‐Bonding Configuration and Interphase Formation Achieving Highly Stable Anode for Rechargeable Aqueous Sodium‐Ion Batteries

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