Influence of Langmuir–Blodgett nanolayers on microbial adhesion

Abstract

Langmuir-Blodgett (LB) nanolayers of alkyl hydroxamic and phosphonic acids on glass, iron and copper surfaces were studied in the presence of different, corrosion relevant micro-organisms. The quality of monomolecular and multimolecular LB layers was characterised by dynamic contact angle measurement, atomic force microscopy and the sum frequency vibration technique. The inhibition efficiency of microbial adhesion and biofilm formation, which was analysed by the surface visualising technique, epifluorescence microscopy and microbiological methods, increased with layer thickness. There were some differences in the blocking activity of the two amphiphiles (octadecylphosphonic acid C18P and octadecanoyl hydroxamic acid C18N) applied in LB films. Their repellent activity did not differ in cooling water but, in the presence of Acidithiobacillus ferrooxidans, the C18N nanolayer inhibited the biofilm formation much better.

Grafting of antibacterial polymers on stainless steel via surface‐initiated atom transfer radical polymerization for inhibiting biocorrosion by Desulfovibrio desulfuricans

“…Although cathodic protection has been reported to effectively inhibit biocorrosion of SS by aerobic bacteria (Guezennec, 1994;Miyanaga et al, 2007), it has been found to have no effect on the adhesion of anaerobic bacteria, and is thus unable to prevent the initiation of pitting corrosion by SRB (de Mele et al, 1995). In view of environmental, ecological, and economical impacts, more recent efforts are focused on developing environmentally benign antimicrobial coatings to prevent bacterial adhesion and biofilm formation (AlDarbi et al, 2002;Sreekumari et al, 2005;Telegdi et al, 2005), as the formation of biofilms is widely recognized as the key step in initiating biocorrosion. Different methods, such as, adsorption, sol-gel processing, and covalent binding, have been used for developing environmentally benign antimicrobial coatings on substrate surfaces to inactivate microorganisms during their initial attachment (Fu et al, 2005;Hu et al, 2005;Lee et al, 2004;Lin et al, 2003;Milović et al, 2005;Tiller et al, 2002;Xu et al, 2006).…”

Molecular layers of hydroxamic acids in copper corrosion inhibition

“…According to Folkers and his co-workers [67] alkane hydroxamic acids form more stable SAM overlayers on different metal oxide surfaces than carboxylic acids or phosphonic acid and provide and important thin organic films on copper and silver. The authorsÕ results [68,69] have shown that multimolecular layers of alkane hydroxamic and phosphonic acids (with long carbon chain) on iron surface diminish the corrosion processes and, at the same time, the microbial adhesion. In the present work the influence of temperature and pH values of the subphase on the hydroxamic acid Langmuir monolayer will be shown by surface pressure-area isotherms and by the monolayer morphology visualized by in situ Brewster angle microscope (BAM).…”

Polystyrene films as barrier layers for corrosion protection of copper and copper alloys

“…Our previous results with carboxylic-, hydroxamic-and phosphonic acids applied in SAM nanocoatings proved the usefulness of these molecular layers as barriers against corrosion and microbial cell adhesion [45][46][47][48][49][50][51]. Recently, the focus of our research moved towards thicker polymer coatings.…”