Retention of antibacterial activity in geranium plasma polymer thin films

AL-Jumaili, Ahmed, Bazaka, Kateryna, and Jacob, Mohan V. (2017) Retention of antibacterial activity in geranium plasma polymer thin films. Nanomaterials, 7 (9). 270. pp. 1-22.

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Bacterial colonisation of biomedical devices demands novel antibacterial coatings. Plasma-enabled treatment is an established technique for selective modification of phyiso-chemical 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 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 extracts-derived polymers may potentially be used as antibacterial coatings for contact lenses.

Item ID: 50214
Item Type: Article (Research - C1)
ISSN: 2079-4991
Keywords: antibacterial coatings; essential oils; geranium oil-derived polymer; plasma polymerisation
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© 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (

Funders: James Cook University (JCU), Australian Research Council (ARC)
Projects and Grants: ARC DECRA Fellowship DE130101550
Date Deposited: 14 Sep 2017 01:55
FoR Codes: 40 ENGINEERING > 4016 Materials engineering > 401608 Organic semiconductors @ 100%
SEO Codes: 86 MANUFACTURING > 8698 Environmentally Sustainable Manufacturing > 869899 Environmentally Sustainable Manufacturing not elsewhere classified @ 100%
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