Journal
APPLIED SURFACE SCIENCE
Volume 441, Issue -, Pages 120-129Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.01.235
Keywords
Metallaboranes; Polystyrene; Piranha solution; Chemical grafting; Surface properties; Antimicrobial activity
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Funding
- Grant Agency of CR [13-06609S]
- Grant Agency of Health Ministry [15-33018A]
- Grant Agency of the J.E. Purkyne University in Usti nad Labem [UJEP-SGS-163-07-03]
- Ministry of Education, Youth and Sports of the Czech Republic [LM2015073]
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The surface of polystyrene foil (PS) was chemically modified. Firstly, the surface was pre-treated with Piranha solution. The activated surface was grafted by selected amino-compounds (cysteamine, ethylenediamine or chitosan) and/or subsequently grafted with five members of inorganic metallaboranes. Selected surface properties were studied by using various methods in order to indicate significant changes before and after individual modification steps of polymer foil. Elemental composition of surface was conducted by using X-ray photoelectron spectroscopy, chemistry and polarity by infrared spectroscopy and by electrokinetic analysis, wettability by goniometry, surface morphology by atomic force microscopy. Antimicrobial tests were performed on individual samples in order to confirm antimicrobial impact. Our results show slight antibacterial activity of PS modified with SK5 for Escherichia coli in comparison with the rest of the tested borane. On the other hand molecules of all tested metallaboranes could easier pierce through bacterial cell of Staphylococcus epidermidis due to absence of outer membrane (phospholipid bilayer). Some borane grafted on PS surface embodies the strong activity for Staphylococcus epidermidis and also for Desmodesmus quadricauda growth inhibition. (C) 2018 Elsevier B.V. All rights reserved.
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