Nanoindentation studies and characterization of hybrid nanocomposites based on solvothermal process

Ayeleru, Olusola Olaitan; Dlova, Sisanda; Akinribide, Ojo Jeremiah; Olorundare, O. F.; Akbarzadeh, Rokhsareh; Devaraju, Murukanahally Kempaiah; Hall, Colin; Ntuli, Freeman; Kupolati, Williams Kehinde; Olubambi, Peter Apata

doi:10.1016/j.inoche.2019.107704

Cited by 5 publications

(4 citation statements)

References 41 publications

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“…In addition to the characteristic peaks of ZnO and ZnS, two broad peaks located at 19.8° and 10° 2 θ were observed and these were attributed to rEPS, which confirmed the presence of rEPS in the nanocomposite. This information from the XRD data, and data from our previous work [ 15 ], were then used in building the molecular structure by simulation.…”

Section: Resultsmentioning

confidence: 99%

“…The rEPS was obtained from a recycling facility in Johannesburg, South Africa and was used in the development of the nanocomposites. The nanocomposites were synthesized as per the methods reported in our previous study by Ayeleru et al [15]. Briefly, rEPS was crushed and then impregnated with metallic precursors, placed in an autoclave reactor, and then this was placed in an oven that had been pre-heated to 250 C, and then heated for 3 h. The resulting products were subsequently characterized and analysed as potential photocatalytic materials.…”

Section: Synthesismentioning

confidence: 99%

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Prediction of electronic properties of novel ZnS–ZnO-recycled expanded polystyrene nanocomposites by DFT

Akbarzadeh

Ayeler

Ibrahim

et al. 2022

Heliyon

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DFT calculations using Material Studio (2019) were used to ascertain the changes in electronic properties of recycled expanded polystyrene (rEPS) after modification with nanoparticles of ZnS and ZnO. The nanocomposites were obtained using rEPS and suitable metal salt precursors via a solvothermal method. The XRD analysis was conducted to obtain the crystallography data of the new rEPS-based nanocomposites. Using Material Studio simulation software, the potential photocatalytic properties of the new prepared material was predicted and information on the electronic band structure was extracted. The calculated band gap values for rEPS and ZnS-ZnO-rEPS nanocomposite were 4.217 eV and 2.698 eV, respectively. Furthermore, our results showed that the nanocomposite is a p-type semiconductor. From the electronic structure and the band gap narrowing, these nanocomposites obtained from a waste material may have some potential in photocatalytic applications.

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Section: Resultsmentioning

confidence: 99%

Section: Synthesismentioning

confidence: 99%

Prediction of electronic properties of novel ZnS–ZnO-recycled expanded polystyrene nanocomposites by DFT

Akbarzadeh

Ayeler

Ibrahim

et al. 2022

Heliyon

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“…Depolymerization is attributed to several factors, shown in Figure 19, among which is the macromolecular scission and the action of free radicals generated during milling. Metallic precursors like Zn(NO3)2•6H2O and Fe(NO3)3•9H2O have been combined with EPS via a solvothermal recycling process in fabricating hybrid nanocomposites with enhanced mechanical properties (schematically shown in Figure 17) [51]. Results from the nanoindentation technique revealed that the hybridized nanocomposites based on Fe2O3 have the best indentation depth of 0.5 nm under the 20 mN indentation load.…”

Section: Depolymerizationmentioning

confidence: 99%

“…Synthesis scheme via the solvothermal method for hybrid nanocomposites. Reprinted with permission from ref [51]…”

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confidence: 99%

Upcycling Polystyrene

et al. 2022

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Several environmental and techno-economic assessments highlighted the advantage of placing polystyrene-based materials in a circular loop, from production to waste generation to product refabrication, either following the mechanical or thermochemical routes. This review provides an assortment of promising approaches to solving the dilemma of polystyrene waste. With a focus on upcycling technologies available in the last five years, the review first gives an overview of polystyrene, its chemistry, types, forms, and varied applications. This work presents all the stages that involve polystyrene’s cycle of life and the properties that make this product, in mixtures with other polymers, command a demand on the market. The features and mechanical performance of the studied materials with their associated images give an idea of the influence of recycling on the structure. Notably, technological assessments of elucidated approaches are also provided. No single approach can be mentioned as effective per se; hybrid technologies appear to possess the highest potential. Finally, this review correlates the amenability of these polystyrene upcycling methodologies to frontier technologies relating to 3D printing, human space habitation, flow chemistry, vertical farming, and green hydrogen, which may be less intuitive to many.

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Assessing thermo-mechanical and wetting properties of epoxy/SBA-15 nanocomposite

et al. 2022

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Nanoindentation studies and characterization of hybrid nanocomposites based on solvothermal process

Cited by 5 publications

References 41 publications

Prediction of electronic properties of novel ZnS–ZnO-recycled expanded polystyrene nanocomposites by DFT

Prediction of electronic properties of novel ZnS–ZnO-recycled expanded polystyrene nanocomposites by DFT

Upcycling Polystyrene

Assessing thermo-mechanical and wetting properties of epoxy/SBA-15 nanocomposite

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