Light as a key driver of freshwater biofouling surface roughness in an experimental hydrocanal pipe rig

Ravizza, Matilde; Giosio, Dean R.; Henderson, AD; Hovenden, Mark J.; Hudson, Monica; Salleh, Sazlina; Sargison, JE; Shaw, Jennifer L.; Walker, GJ; Hallegraeff, Gustaaf M.

doi:10.1080/08927014.2016.1184255

Cited by 2 publications

(1 citation statement)

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“…a zwitterionic polymer (ZWP). Those four polymer chemistries were chosen to represent the range of surface properties commonly seen in applications ranging from fabrics and biomedical devices to energy storage and manufacturing instruments. − The effects of their surface energy, charge, and functional moieties on surfactant−surface interactions and subsequent biofilm formation are analyzed in detail below.…”

Section: Resultsmentioning

confidence: 99%

Reduced Biofilm Formation at the Air–Liquid–Solid Interface via Introduction of Surfactants

Chen

Lang

Donadt

et al. 2021

ACS Biomater. Sci. Eng.

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Reduced biofilm formation is highly desirable in applications ranging from transportation to separations and healthcare. Biofilms often form at the three-phase interface where air, liquid, and solid coexist due to the close proximity to nutrients and oxygen. Reducing biofilm formation at the triple interface presents challenges because of the conflicting requirements for hydrophobicity at the air−solid interface (for selfcleaning properties) and for hydrophilicity at the liquid−solid interface (for reduced foulant adhesion). Meeting those needs simultaneously likely entails a dynamic surface, capable of shifting the surface energy landscape in response to wetting conditions and thus enabling hydrophobicity in air and hydrophilicity in water.Here, we designed a facile approach to render existing surfaces resistant to biofilm formation at the triple interface. By adding trace amounts (∼0.1 mM) of surfactants, biofilm formation of Pseudomonas aeruginosa (known to form biofilm at the triple interface) was reduced on all surfaces tested, ranging from hydrophilic to hydrophobic, polar to nonpolar. That reduced fouling was not a result of the known antimicrobial effects. Instead, it was attributed to the surface-adsorbed surfactants that dynamically control surface energy at the triple interface. To further understand the effect of surfactant−surface interactions on biofilm reduction, we systematically varied the surfactant charge type and surface properties (surface energy and charge). Electrostatic interactions between surfactants and surfaces were identified as an influential factor when predicting the relative fouling reduction upon introduction of surfactants. Nevertheless, biofilm formation was reduced even on the charge-neutral, fluorinated surface made of poly(1H, 1H, 2H, 2H-perfluorodecyl acrylate) by more than 2-fold simply via adding 0.2 mM dodecyl trimethylammonium chloride or 0.3 mM sodium dodecyl sulfate. Given its robustness, this strategy is broadly applicable for reducing fouling on existing surfaces, which in turn improves the cost-effectiveness of membrane separations and mitigates contaminations and nosocomial infections in healthcare.

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Section: Resultsmentioning

confidence: 99%