فهرست مطالب نرگس کریمی زاده

The fast spread of COVID-19 in the world has raised as a serious threat for human health and global economy and is considered as a new challenge in medicine. In this paper, complete information is presented about treatment of viruses with the aid of nano-particles via attachment to the virus, release of reactive oxygen species, or destructive ions. In the present paper, present and potential applications of nano-technology to deal with viruses are reviewed, in the synthesis of various nano-based materials such as nano-delivery systems for treatment, personal protective equipment, and diagnostic devices. Here, the role of nano-materials in drug delivery is similar to other fields in nano-medicine; however, their intrinsic accumulation in macrophages is favorable for COVID-19. Nano-materials can be used in masks for longer usage times or air filters to ensure more protection. The new nano-based diagnostics are faster and sometimes more accurate than the traditional PCR method. The discussed nano-particle based methods for COVID-19 can also be considered for new viruses that will appear in future.

In this study, the few-layer graphene foam (GF) was synthesized by chemical vapor deposition (CVD) method and the effect of methane concentration and the synthesizing temperature on the number of GF layer have been studied. With methane concentration changing as 0.5, 0.6, 0.7, 1 and 1.5 sccm (standard cubic centimeters per minute) the 2, 4, 6, 11 and 25 layer graphene foam was obtained, respectively. The CVD synthesizing temperature also was studied and by changing the temperature as 900, 1000 and 1120˚C, the 23, 10 and 6 layer GF was synthesized. The images of scanning electron microscopy (SEM) showed the good quality of porous structure of synthesized GF. Raman analysis was used to confirm the formation of graphene foam and to find the relationship between the methane concentration and the synthesizing temperature (as synthesizing conditions) and layers number of GF. The obtained results from Raman analysis showed that the methane concentration and synthesizing temperature are important parameters for formation of few-layer GF. The two-layer GF was synthesized by decreasing the concentration of methane to 0.6 sccm and increasing the temperature to 1120˚C.