A material engineer at MIT explained 'How to disinfect the display of a smartphone'


is said that there is contact infection in one of the infection routes of the novel coronavirus infection (COVID-19). In particular, smartphones that modern people always touch and operate can be a serious source of infection, so it is very important to clean the smartphone display regularly. Robert McFarlane, a professor of materials engineering and engineering at the Massachusetts Institute of Technology (MIT), explains the disinfection of such smartphone displays.

3Q: Robert Macfarlane on cleaning your smartphone screen | MIT News

Every time you touch the surface of something such as a mobile phone, a certain amount of the substance on your hand moves to the surface you touch. In addition, the material of the surface that you touch with your hands can be touched to some extent. That's why McFarlane explains that smartphone makers minimize the amount of residue left on the surface by coating the display with a material that is chemically strong and does not adsorb other substances.

In order to reliably prevent the spread of COVID-19 infection, it is necessary to develop an antibacterial coating that prevents the attachment of pathogens. According to Professor McFarlane, the development of such coatings is being actively researched in the field of material engineering.

However, the smartphone display has 'transparency' so that the image can be seen clearly, 'electrical resistance' so that it does not respond when not touched, 'conductive' because it reacts when touched, and it can be touched or dirty. Various characteristics are required, such as 'durability' that does not break even if it is worn, and 'ease of handling' that can be easily cleaned by wiping. Even if a new coating is applied to the display to make it antibacterial, it may lose some other property, which makes exponential development difficulty. Therefore, to use the smartphone cleanly, it is necessary to clean it appropriately.

Smartphone displays are generally coated with an oil-repellent coating such as

fluorocarbon resin or fluorocarbon . For example, most of the dirt that remains on the display when touched with a finger is oil and fat, and by applying an oil-repellent coating on the surface of the display, it is possible to minimize the amount of oil and fat remaining.

According to Professor McFarlane, oil-repellent coatings are less likely to be removed with rubbing alcohol, but long-term exposure to high concentrations of alcohol can lead to loss of coating uniformity. If the coating is non-uniform, residues tend to adhere, which may affect the optical and mechanical properties of the display such as visibility and touch sensitivity. In other words, Professor McFarlane argues that it is best to avoid using the high-concentration disinfectant solution used for hand disinfection etc. to clean the display as it is.

Professor McFarlane says, 'When cleaning the smartphone display, dilute the rubbing alcohol with water to some extent before using it.' In addition, `` The oil-repellent coating on the display of smartphones prevents the adhesion of microorganisms to some extent, but considering the pandemic of COVID-19, it cannot be said that it sufficiently prevents contamination by microorganisms. No. ”

According to security company Kaspersky, 'The disinfectant solution that has the least effect on oil-repellent coatings is isopropyl alcohol , and the concentration is 70-80% is optimal.' 'Vodka, whiskey, and other ethanol for beverages damage oil-repellent coatings. There is a possibility that it will end up, so you should not use it. '

Smartphone disinfection: How to get rid of the new coronavirus | Kaspersky Lab Official Blog

in Note,   Mobile, Posted by log1i_yk