To the date of writing this paper, the number of infections is soared exponentially, reaching to more than 3.4 million patients around the world, and around 7% of them died. The demand for the ventilator, respirator, facemask, and body protection has been surging dramatically during the COVID-19 pandemic. The charged nanofiber filter able to capture novel corona virus (COVID-19) with 94% efficiency and a pressure drop less than 20В MPa. The present review outlines the most efficient antiviral nanoparticles including the recent functional nanoparticles.В The filtration theory, filtration modeling, filter testing, and different types of filter with special concentration on the charged nanofiber filter were discussed. The efficiency of filter must be kept at accepted level without increasing the pressure drop. Most recently, the charged nanofiber filters of sizes below 100В nm are developed and provide an efficient viral filtration and inactivation.

While the efficiency of this type of filters still needs to be enhanced, new developed nanofiber filters are proposed. The nanoparticle-coated airborne filter is a suitable technique in this regard. The average size of the novel corona virus (COVID-19) is 100В nm and there is no standard or special filter suitable for this virus. N95 and N98 filters are the must use filters for capturing particles of sizes around 300В nm. Human secretion of the infected person as nasal or saliva droplets goes as airborne and distributes the virus everywhere around the person. The ventilation and airborne filters are also investigated aiming to develop an efficient antiviral filtration technology. More than 4 million people globally are infected by the virus and about 300,000 dead cases until this moment. 2016, 55, 8032вЂ“8035.Novel corona virus (COVID-19) pandemic in the last 4В months stimulates the international scientific community to search for vaccine of antiviral agents suitable for in activating the virus inside and outside the human body. Infinite Polyiodide Chains in the Pyrroloperylene-Iodine Complex: Insights into the Starch-Iodine and Perylene-Iodine Complexes,.It turned out that the material containing these chains absorbs light at very similar wavelengths to the amylose-iodine complex, which supports the hypothesis that similar polymeric chains form in the iodine test for starch. They found nearly linear polyiodide chains in-between stacks of pyrroloperylene. The material is crystalline, andВ therefore, the team was able to determine its structure using X-ray crystallography. The team investigated a related system, a pyrroloperyleneвЂ“iodine complex, to study its properties as an organic electronic conductor. However, Ram Seshadri, Fred Wudl, and colleagues,В University of California, Santa Barbara, USA, have found evidence that infinite polyiodide chains I n xвЂ“ are contained in the amylose-iodine complex. It has been proposed that the species inside the helix are repeated I 3 вЂ“ or I 5 вЂ“ units. The amylose-iodine complex is amorphous (i.e., it does not form ordered crystals), which has made it difficult to determine its structure. The exact structure of the polyiodides inside the amyloid helix is not clear. This complex absorbs light of a different wavelength than polyiodide, and the color turns dark blue. Once amylose is added, it forms another CT complex, Here, the amylose acts as a charge donor and the polyiodide as an acceptor. In the case of the aqueous solution of polyiodides, the absorptions of the different species lead to an overall brownish color. The light is absorbed in the process and its complementary color is observed by the human eye. Electrons in such charge-transfer complexes are easy to excite to a higher energy level by light. The negatively charged iodide in these compounds acts as charge donor, the neutral iodine as a charge acceptor. Together, they form polyiodide ions of the type I n вЂ“, for example, I 3 вЂ“, I 5 вЂ“, or I 7 вЂ“. Molecular iodine (I 2) is not easily soluble in water, which is why potassium iodide is added. The colors are caused by so-called charge transfer (CT) complexes. Its chain forms a helix shape, and iodine can be bound inside this helix (pictured below). One is the linear amylose and the other is the branched amylopectin (pictured below).ДЄmylose is the compound that is responsible for the blue color. It consists of two different types of polysaccharides that are made up of glucose units which are connected in two different ways. Starch is a carbohydrate found in plants. If it is added to a sample that contains starch, such as the bread pictured above, the color changes to a deep blue. A solution of iodine (I 2) and potassium iodide (KI) in water has a light orange-brown color. Using iodine to test for the presence of starch is a common experiment.

Chem c3000 make iodine