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Cellulosic fiber (CF) in nanoform is emergingly finding its way for COVID-19 solution for instance via nanocomposite/nanoparticle from various abundant biopolymeric waste materials, which may not be widely commercialized when the pandemic strikes recently. The possibility is wide open but needs proper collection of knowledge and research data. Thus, this article firstly reviews CF produced from various lignocellulosic or biomass feedstocks' pretreatment methods in various nanoforms or nanocomposites, also serving together with metal oxide (MeO) antimicrobial agents having certain analytical reporting. CF-MeO hybrid product can be a great option for COVID-19 antimicrobial resistant environment to be proposed considering the long-established CF and MeO laboratory investigations. Secondly, a preliminary pH investigation of 7 to 12 on zinc oxide synthesis discussing on Fouriertransform infrared spectroscopy (FTIR) functional groups and scanning electron microscope (SEM) images are also presented, justifying the knowledge requirement for future stable nanocomposite formulation. In addition to that, recent precursors suitable for zinc oxide nanoparticle synthesis with emergingly prediction to serve as COVID-19 purposes via different products, aligning with CFs or nanocellulose for industrial applications are also reviewed., (© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)

Lightweight, polyacrylonitrile‐derived electrodes with different additives were fabricated using high‐throughput nozzle‐free electrospinning. The electrospun precursor nanofibers (PNFs) containing iron oxide, gold nanoparticles, or reduced graphene oxide (rGO) were subjected to oxidative stabilization and carbonization to obtain a carbon‐rich conductive nanofiber structure. Scanning electron microscopy showed that the carbon nanofibers contracted between 11 and 55% while the Fourier‐transform infrared spectroscopy confirmed that the carbon nanofibers were thermally stable. Thermogravimetric and differential scanning calorimetry results revealed that the cross‐linking of the chain molecules and cyclization were completed. Next, cyclic voltammetry results indicated that the electroactivity of the modified screen‐printed carbon electrodes was decreased by 85% due to the presence of carbon glue. The modified device presented significant enhanced electrochemical responses with the inclusions of nanoparticles, with rGO showing a 2.13 times higher electroactive surface area, followed by iron oxide (two times) and gold nanoparticles (1.37 times) than the equivalent PNFs. [ABSTRACT FROM AUTHOR]

• The interfacial tension (IFT) without SiO 2 nanoparticles decreases as the temperature increases. • The IFT reduces with addition of SiO 2 nanoparticles. • Increasing the addition of SiO 2 nanoparticles decreased the IFT value. • The diffusion coefficient values increased when the temperature increased. • Adding SiO 2 nanoparticles also has a significant effect to the mobility of the molecules. The effect of adding silicon dioxide (SiO 2) nanoparticles at various surfactant concentrations, sodium dodecyl sulfate (SDS) and elevated temperature of 298 K–383 K in enhancing the oil recovery during CO 2 foam flooding via dynamic simulation was investigated. Molecular dynamic simulation of the CO 2 foam system of enhanced oil recovery (EOR) application in a reservoir system was conducted using different systems i.e [H 2 O/CO 2 /SDS]-[H 2 O/Hexane] and [H 2 O/CO 2 /SDS/SiO 2 ]-[H 2 O/Hexane], consisting of different number of molecules were constructed prior to the simulation. The critical aggregation concentration (CAC) occurred at 20, 20 and 23 SDS for the system at 298, 308 and 383 K, respectively. The predicted interfacial tension (IFT) for the system without SiO 2 decreased from the range of 1.12–5.51 to 0.40–4.57 mN/m while for 1 and 2 SiO 2 nanoparticle reduced from the range of 0.46–4.77 to 0.50–2.72 mN/m when the temperature increased from 298 to 383 K. [ABSTRACT FROM AUTHOR]