Antibacterial properties of metal and PDMS surfaces under weak electric fields

SURFACE & COATINGS TECHNOLOGY

卷:394

Article

Lou, Yuzhen^1,2  Thebault, Pascal^3,4  Burel, Fabrice^1,2  Kebir, Nasreddine^1,2 

[1] Normandie Univ, Lab PBS, UMR 6270, INSA Rouen Normandie,CNRS, Ave Univ, F-76801 St Etienne Du Rouvray, France

[2] Normandie Univ, Lab PBS, FR 3038, INSA Rouen Normandie, Ave Univ, F-76801 St Etienne Du Rouvray, France

[3] Normandie Univ, Lab PBS, UMR 6270, UNIROUEN,CNRS, F-76821 Mont St Aignan, France

[4] Normandie Univ, Lab PBS, FR 3038, UNIROUEN, F-76821 Mont St Aignan, France

关键词: Electrical field;    Bacterial adhesion;    PDMS;    Metal surface;    Bactericidal effect;   

DOI  :  10.1016/j.surfcoat.2020.125912

来源: Elsevier

【 摘 要 】

The adhesion of several species of bacteria on two parallel rectangular electrodes under weak electric fields was studied. The electrodes were based on native metal or PDMS coated Cu. After 2 h of contact at a voltage of 0.2 to 1 V without any current, the Zn cathode showed a bacterial repellent effect with a difference in bacterial adhesion of about 1.5 to 2 log CFU/cm2 on the anode. Al electrodes were inactive due to their passivation by the alumina layer. At 1 V, both Zn and Al exhibited more than 80% mortality of suspended bacteria. The Cu electrodes showed a very high bactericidal effect even at 0 V, and the bacterial adhesion on its surface was too weak to see a difference between the two electrodes. A similar study carried out on PDMS surfaces, covering Cu electrodes, revealed that a difference of 1 log CFU/cm2 of bacterial adhesion between the cathode and anode surfaces can be obtained by applying a voltage ranging from 10 to 30 V. This cathodic repellent effect was specific to staphylococcus species, suggesting that in the presence of a PDMS coating, the electrostatic forces on the surface are too low to be the main factor governing bacterial adhesion.

【 授权许可】

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