| Grafting of ionic liquids on stainless steel surface for antibacterialapplication Colloids and Surfaces B: Biointerfaces 2015，126: 162-168 Stainless steel (SS) is favored for many uses due to its excellent chemical resistance, thermal stabilityand mechanical properties. Biofilms can be formed on stainless steel and may lead to serious hygieneproblems and economic losses in many areas, e.g. food processing, public infrastructure and healthcare.For the first time, our work endeavored to make SS having antibacterial properties, ionic liquids (ILs) weregrafted on SS surface via silane treatment followed by thiol-ene click reaction. The chemical structure andcomposition of the ILs grafted stainless-steel coupon surfaces were characterized by X-ray photoelectronspectroscopy (XPS) and attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy.The antibacterial activity has been investigated, and the results showed that the ILs grafted SS surfaceexhibited significant antibacterial effects against Gram-negative Escherichia coli. Additionally, the resultsobtained here indicated that the ILs used here having bromide anion showed much better antibacterialactivity against E. coli than the corresponding ILs with tetrafluoroborate and hexafluorophosphate asanions. These results obtained here can help to design novel and more efficient stainless steel havingantibacterial surface.
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