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Localized Alkaline Microenvironments Enhanced upon Tip Effects for Efficient Antibacterial Applications.

Junrong Chen1, Hao Liu2, Yanjing Wang1

  • 1Institute of Biomedical Engineering, College of Life Sciences, Qingdao University, Qingdao, 266071, P.R. China.

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Summary

This study introduces a novel electrocatalytic sterilization method using a localized alkaline microenvironment. This safe and eco-friendly approach rapidly inactivates bacteria like Escherichia coli at low voltage.

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Alkaline microenvironmentAntibacterial applicationsElectrochemical disinfectionNanowireTip-enhanced electric field

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Area of Science:

  • Electrochemistry
  • Environmental Science
  • Microbiology

Background:

  • Traditional electrochemical disinfection uses high voltages or gas supply.
  • Existing methods face limitations in safety and efficiency.

Purpose of the Study:

  • To develop an in situ electrocatalytic sterilization strategy.
  • To create localized alkaline microenvironments for disinfection.
  • To overcome limitations of existing electrochemical disinfection methods.

Main Methods:

  • Utilized a nanowire cathode under constant current (-12 mA) and low voltage (-0.5 V vs. RHE).
  • Employed scanning electrochemical microscopy (SECM) and finite element analysis (FEA).
  • Investigated the adsorption of hydronium ions (H3O+) and generation of hydroxide ions (OH-).

Main Results:

  • Achieved localized alkaline microenvironments around the cathode.
  • Demonstrated effective inactivation of Escherichia coli (10^7 CFU/mL) within 3 minutes.
  • Observed enhanced OH- accumulation due to the nanowire tip-enhanced effect.

Conclusions:

  • The proposed method offers efficient and rapid sterilization.
  • Localized alkaline environments effectively inhibit bacterial ATP synthesis and induce oxidative stress.
  • This approach is safe, environmentally friendly, and minimizes overall pH impact.