Vibration at structural resonance frequency of hydrophilic substrates enhances biofilm removal

William C. Ballance, Inkyu Oh, Yang Lai, Mohamed Elhebeary, M Taher A Saif, Yuhang Hu, Hyun Joon Kong

Research output: Contribution to journalArticle

Abstract

Biological fouling damages both human health and industry by causing infection, corrosion, structural failure, and drag on marine ships. Current efforts to clean bio-fouled surfaces by externally applying intensive mechanical energy often result in relapsed cell growth. Therefore, this study examines the extent that cell-structure interactions are orchestrated by vibration frequency, voltage-induced energy input mode, and surface energy to clean bio-fouled surfaces. This study was conducted with a tough polyacrylamide gel-coated polypropylene substrate attached to a flexible dielectric actuator that can vibrate when an oscillatory voltage is applied. We found that the maximum biofilm removal occurs by vibrating the gel-coated surface at the structural resonance frequency using a square wave input voltage. In addition, tuning the surface energy of the substrate was necessary for biofilm removal by decreasing the bacterial adhesive force. The findings from this study can be broadly applicable to assembling various advanced anti-fouling medical and industrial devices.

Original languageEnglish (US)
Article number126950
JournalSensors and Actuators, B: Chemical
Volume299
DOIs
StatePublished - Nov 15 2019

Fingerprint

biofilms
Biofilms
Vibrations (mechanical)
Fouling
Interfacial energy
vibration
surface energy
Electric potential
electric potential
Substrates
Gels
structural failure
gels
antifouling
fouling
Polypropylenes
square waves
Cell growth
infectious diseases
ships

Keywords

  • Bacterial adhesion
  • Biofilm
  • Biofouling
  • Dielectric elastomer actuators
  • Tough hydrogel

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Vibration at structural resonance frequency of hydrophilic substrates enhances biofilm removal. / Ballance, William C.; Oh, Inkyu; Lai, Yang; Elhebeary, Mohamed; Saif, M Taher A; Hu, Yuhang; Kong, Hyun Joon.

In: Sensors and Actuators, B: Chemical, Vol. 299, 126950, 15.11.2019.

Research output: Contribution to journalArticle

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AU - Ballance, William C.

AU - Oh, Inkyu

AU - Lai, Yang

AU - Elhebeary, Mohamed

AU - Saif, M Taher A

AU - Hu, Yuhang

AU - Kong, Hyun Joon

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AB - Biological fouling damages both human health and industry by causing infection, corrosion, structural failure, and drag on marine ships. Current efforts to clean bio-fouled surfaces by externally applying intensive mechanical energy often result in relapsed cell growth. Therefore, this study examines the extent that cell-structure interactions are orchestrated by vibration frequency, voltage-induced energy input mode, and surface energy to clean bio-fouled surfaces. This study was conducted with a tough polyacrylamide gel-coated polypropylene substrate attached to a flexible dielectric actuator that can vibrate when an oscillatory voltage is applied. We found that the maximum biofilm removal occurs by vibrating the gel-coated surface at the structural resonance frequency using a square wave input voltage. In addition, tuning the surface energy of the substrate was necessary for biofilm removal by decreasing the bacterial adhesive force. The findings from this study can be broadly applicable to assembling various advanced anti-fouling medical and industrial devices.

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