Al-Jumaili Ahmed, Bazaka Kateryna, Jacob Mohan V
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.
Nanomaterials (Basel). 2017 Sep 13;7(9):270. doi: 10.3390/nano7090270.
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 , , and 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.
生物医学设备的细菌定植需要新型抗菌涂层。等离子体处理是一种用于选择性改变表面物理化学特性和沉积聚合物薄膜的成熟技术。我们研究了天竺葵基等离子体聚合物薄膜中固有抗菌活性的保留情况。与对照或在较高输入功率下制备的薄膜相比，在10 W射频（RF）功率下制备的样品表面上，金黄色葡萄球菌、大肠杆菌和铜绿假单胞菌的附着和生物膜形成显著减少。这归因于在低输入功率条件下制备的聚合物薄膜中较低的接触角和原始化学官能团的保留。所有表面的形貌均一且光滑，在10 W和100 W下制备的薄膜的表面粗糙度分别为0.18和0.69 nm。薄膜的硬度和弹性模量随输入功率增加。与输入功率无关，薄膜在可见波长范围内是光学透明的，主要吸收峰在~290 nm处，光学带隙约为3.6 eV。这些结果表明，天竺葵提取物衍生的聚合物可能潜在地用作隐形眼镜的抗菌涂层。
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