HC Plastics News: Researchers at the Nanomedical Science Center of Karolinska Institute in Sweden recently discovered a new plastic in the screen of a smartphone that can be used to stimulate the metabolism of germs. Researchers have been able to induce deceptive bacterial growth and death by adding or removing electrons on the plastic surface. Once the technology is mature, the method can be widely used in medical and wastewater management.
Researchers say that when bacteria attach to the surface of a object, they quickly grow a superficial film called a "biofilm," which protects the bacteria from the environment around us. But if in the hospital, sterilization is not complete during the surgery, some bacteria may cause the patient to be infected or even life-threatening. Now researchers have discovered that the production of a medical device coating made of inexpensive conductive plastic called PEDOT can solve the sterilization problem. The plastic is widely used in smart screens of mobile phones, and feedback to the screen by means of touch control voltage. When PEDOT is covered by electrons, it will affect the growth of Salmonella.
Lead researcher Agneta Richter-Dahlfors explained: "When bacteria fall on the surface of electron-filled PEDOT, they can no longer replicate. As electrons are released, bacteria accumulate electrons and transform the energy needed for the growth of bacteria. Let the bacteria grow out of the biofilm and enhance the vitality of the bacteria. But if the electrons are absorbed, the bacterial biofilm will be destroyed, which will accelerate the death of the bacteria."
The plastic in the smartphone screen can be sterilized
Professor Richter-Dahlfors said: "First, we can use this material to coat medical devices to make them more resistant to bacterial invasion. In the wastewater management industry, on the contrary, we need a lot of beneficial biofilms to create clean water. We can create a surface that promotes biofilm production."
The future development of the research team also hopes to integrate the technology into implanted medical devices to ensure the safety of the implant during medical implantation. The technology is published in the new issue of the journal npjbi of ilms and microbiomes. 
Editor in charge: Ye Dan
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