Coatings against corrosion and microbial adhesion

Abstract

A systematic study on anti-corrosion and anti-fouling effect of hydrophobic Langmuir-Blodgett and self-assembled molecular layers deposited on metal surfaces, as well as anti-microbial adhesion properties of coatings with biocide is presented. Both types of efficiencies produced by LB films are enhanced by Fe 3þ ions built in the molecular film. The quaternary ammonium type biocide embedded into the cross-linked gelatin decreased significantly the microbial adhesion, the biofilm formation.

Mössbauer study of C18N/Fe Langmuir-Blodgett layers

“…These parameters reflect the occurrence of iron in valence state of Fe 3+ in the LB layer. This result is confirmed by previous Mössbauer results, obtained also in transmission geometry, of LB layers [1]. Figure 1 shows room temperature CEM spectra of C18N/Fe LB films consisting of different number of layers.…”

“…These LB films on metal surfaces like copper could be applied as potential anticorrosive and bacterial adhesion preventing coatings [1]. In order to produce the most compact LB layer, the structure and behavior of amphiphiles in the molecular layer at the air-water interface should be very precisely monitored as the physical and chemical parameters of the subphase and the Langmuir monolayers influence the quality of LB films deposited onto solid supports [2,3].…”

Nanostructured surface pre‐treatment based on self‐assembled molecules for corrosion protection of Alclad 7475‐T761 aluminum alloy

“…The a int estimated value of 0.5 associated to CPE3 suggests a diffusion-controlled process within the oxide film. The EC associated to the Oxide þ SAM treatment, has already been proposed in the literature to simulate the effect of oxide growth on Al alloys [33][34][35][36]. Bessone et al [33] proposed that the oxide film grows due to concentration gradient of cation and anion vacancies or any charged species within the oxide film leading to kinetics under transport control of vacancies across the film.…”

“…The results, however, show a slight beneficial effect against corrosion of these two treatments leading to increased impedances of the aluminum alloy. The model proposed shows two time constants, with R1 being related to charge transfer processes through the thin oxide film on the alloy surface and CPE1, probably associated to a series connection between the double layer capacity (C dl ) and the oxide layer capacity (C ox ) [36]. The RL/L pair, on the other hand, is likely due to the relaxation of adsorbed species, mainly sulphate and oxygen ions, on the metallic substrate exposed underneath the defects in the thin oxide.…”

The Characterization of Self-Assembled Monolayers on Copper Surfaces by Low-Temperature Plasma Mass Spectrometry

“…The characterizations of SAMs on copper, such as surface morphology, defects in the film, adhesion, wettability, and molecular identification [1][2][3][4], are very important. Many complementary methods have been utilized for the characterization of SAMs on copper, including (but are not limited to) reflectance infrared spectroscopy (IR) [3,5], X-ray photoelectron spectroscopy (XPS) [6,7], scanning electronic microscopy (SEM) [8,9], ellipsometry, contact angles (CA) [3,9], as well as electrochemical analysis, including cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) [10][11][12][13]. IR and XPS identified specific functional groups and oxidation states.…”