Influence of Zn concentration on zinc oxide nanoparticles and their anti-corrosion property

Aboorvakani, R.; Vethanathan, S. John Kennady; Madhu, K.U.

doi:10.1016/j.jallcom.2020.155078

Cited by 44 publications

(19 citation statements)

References 57 publications

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“…Figure 2 b shows the FT-IR spectrum of the optimized ZnO NPs where the characteristic ZnO NP absorption bands could be observed at 3400 and 430 cm –1 assigned to O–H and Zn–O stretching, respectively, confirming the formation of ZnO NPs. 31 , 32 The bands at 1650, 1430, and 1265 cm –1 resulted from stretching vibration of C=O, the attached CH 2 groups, and C–N in the pyrrole ring of PVP, respectively. 31 …”

Section: Resultsmentioning

confidence: 99%

Investigating the Internalization and COVID-19 Antiviral Computational Analysis of Optimized Nanoscale Zinc Oxide

et al. 2021

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Global trials are grappling toward identifying prosperous remediation against the ever-emerging and re-emerging pathogenic respiratory viruses. Battling coronavirus, as a model respiratory virus, via repurposing existing therapeutic agents could be a welcome move. Motivated by its well-demonstrated curative use in herpes simplex and influenza viruses, utilization of the nanoscale zinc oxide (ZnO) would be an auspicious approach. In this direction, ZnO nanoparticles (NPs) were fabricated herein and relevant aspects related to the formulation such as optimization, structure, purity, and morphology were elucidated. In silico molecular docking was conducted to speculate the possible interaction between ZnO NPs and COVID-19 targets including the ACE2 receptor, COVID-19 RNA-dependent RNA polymerase, and main protease. The cellular internalization of ZnO NPs using human lung fibroblast cells was also assessed. Optimized hexagonal and spherical ZnO nanostructures of a crystallite size of 11.50 ± 0.71 nm and positive charge were attained. The pure and characteristic hexagonal wurtzite P 63 mc crystal structure was also observed. Interestingly, felicitous binding of ZnO NPs with the three tested COVID-19 targets, via hydrogen bond formation, was detected. Furthermore, an enhanced dose-dependent cellular uptake was demonstrated. The obtained results infer a rationale, awaiting validation from further biological and therapeutic studies.

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Section: Resultsmentioning

confidence: 99%

Investigating the Internalization and COVID-19 Antiviral Computational Analysis of Optimized Nanoscale Zinc Oxide

et al. 2021

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“…It is shown in Figure 3 that the surface charge of ZnO changed from positive to negative with the addition of NOM, and the overall increase in the absolute value indicates an excellent dispersion stability. The NOM with negative charge increasingly tended to coat the surface of ZnO with positive charge, improving the dispersion stability [43], and, generally, remained stable above the absolute value of 30 mV [44]. pH was found to range from 7.53 to 7.99, with and without NOMs in the OECD medium, ISO medium, and dechlorinated tap water test medium, suggesting that the range was acceptable for ecotoxicity tests without further pH adjustment.…”

Section: Determination Of Surface Charge Of Nanoparticles In Test Mediummentioning

confidence: 90%

“…The absolute value of the surface charge of ZnO dispersed in DI water was 52.35 mV with NOM and 36.47 mV without NOM, indicating that the absolute value above 30 mV was high enough to be completely dispersed [44] (Figure 3).…”

Section: Determination Of Particle Size and Distribution In Test Mediummentioning

confidence: 99%

Influence of NOM on the Stability of Zinc Oxide Nanoparticles in Ecotoxicity Tests

et al. 2020

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Nanomaterials are known to aggregate in the presence of ions. Similarly, the aggregation of zinc oxide nanoparticles (ZnO NPs) exposed to various ions such as sodium chloride and calcium chloride in water systems increases with the ionic strength. Therefore, for accurate toxicity studies, it is necessary to conduct a test using natural organic matters (NOMs) as additional dispersants that strengthen stability with increased repulsive forces. The three types of ecotoxicity tests based on the dispersion stability test using NOM showed that the toxicities of the three test samples decreased in the presence of NOM. To determine how NOM improved dispersion and reduced toxicities, we analyzed the ionization degree of ZnO NPs with and without NOM and found that the solubility was below 2 mg/L with a negligible change over time, implying that the ionization effect was low. The absolute value of the surface charge of particles increased in the presence of NOM, resulting in increased repulsive electrostatic forces and steric hindrance, causing less aggregation and more dispersion. Additionally, although the NOM used in the test is considered an effective dispersant that does not have a toxicological effect on aquatic organisms, the presence of NOM resulted in reduced toxicities and should be further investigated to establish it as a standard test method.

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“…The observed peaks at 2926 and 2856 cm − 1 are assigned to the sp 3 and sp 2 carbon stretching vibrations, respectively. Additionally, the bands at 1508 and 1430 cm − 1 can be attributed to the carbonyl groups of residual acetate groups of zinc precursor [ 51 , 52 ]. Peak at 879 cm − 1 and the high intense one at 518 cm − 1 occur due to the metal-oxygen vibrational modes of ZnO compounds.…”

Section: Resultsmentioning

confidence: 99%

Unravelling the Role of Synthesis Conditions on the Structure of Zinc Oxide-Reduced Graphene Oxide Nanofillers

2021

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The diversity of zinc oxide (ZnO) particles and derived composites applications is highly dependent on their structure, size, morphology, defect amounts, and/or presence of dopant molecules. In this work, ZnO nanostructures are grown in situ on graphene oxide (GO) sheets by an easily implementable solvothermal method with simultaneous reduction of GO. The effect of two zinc precursors (zinc acetate (ZA) and zinc acetate dihydrate (ZAD)), NaOH concentration (0.5, 1 or 2 M), and concentration (1 and 12.5 mg/mL) and pH (pH = 1, 4, 8, and 12) of GO suspension were evaluated. While the ZnO particle morphology shows to be precursor dependent, the average particle size length decreases with lower NaOH concentration, as well as with the addition of a higher basicity and concentration of GO suspension. A lowered band gap and a higher specific surface area are obtained from the ZnO composites with higher amounts of GO suspension. Otherwise, the low concentration and the higher pH of GO suspension induce more lattice defects on the ZnO crystal structure. The role of the different condition parameters on the ZnO nanostructures and their interaction with graphene sheets was observed to tune the ZnO–rGO nanofiller properties for photocatalytic and antimicrobial activities.

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Influence of Zn concentration on zinc oxide nanoparticles and their anti-corrosion property

Cited by 44 publications

References 57 publications

Investigating the Internalization and COVID-19 Antiviral Computational Analysis of Optimized Nanoscale Zinc Oxide

Investigating the Internalization and COVID-19 Antiviral Computational Analysis of Optimized Nanoscale Zinc Oxide

Influence of NOM on the Stability of Zinc Oxide Nanoparticles in Ecotoxicity Tests

Unravelling the Role of Synthesis Conditions on the Structure of Zinc Oxide-Reduced Graphene Oxide Nanofillers

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