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Nanomaterials 2017, 7(9), 270;

Retention of Antibacterial Activity in Geranium Plasma Polymer Thin Films

Electronics Materials Lab, College of Science and Engineering, James Cook University, Townsville, QLD 4811, Australia
School of Chemistry, Physics, Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia
Author to whom correspondence should be addressed.
Received: 3 August 2017 / Revised: 5 September 2017 / Accepted: 5 September 2017 / Published: 13 September 2017
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Bacterial colonisation of biomedical devices demands novel antibacterial coatings. Plasma-enabled treatment is an established technique for selective modification of physicochemical characteristics of the surface and deposition of polymer thin films. We investigated the retention of inherent antibacterial activity in geranium based plasma polymer thin films. Attachment and biofilm formation by Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli was significantly reduced on the surfaces of samples fabricated at 10 W radio frequency (RF) power, compared to that of control or films fabricated at higher input power. This was attributed to lower contact angle and retention of original chemical functionality in the polymer films fabricated under low input power conditions. The topography of all surfaces was uniform and smooth, with surface roughness of 0.18 and 0.69 nm for films fabricated at 10 W and 100 W, respectively. Hardness and elastic modules of films increased with input power. Independent of input power, films were optically transparent within the visible wavelength range, with the main absorption at ~290 nm and optical band gap of ~3.6 eV. These results suggest that geranium extract-derived polymers may potentially be used as antibacterial coatings for contact lenses. View Full-Text
Keywords: antibacterial coatings; essential oils; geranium oil-derived polymer; plasma polymerisation antibacterial coatings; essential oils; geranium oil-derived polymer; plasma polymerisation

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Al-Jumaili, A.; Bazaka, K.; Jacob, M.V. Retention of Antibacterial Activity in Geranium Plasma Polymer Thin Films. Nanomaterials 2017, 7, 270.

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