Deposition and properties of carbon-based amorphous protective coatings

Growth Mechanism of Oxygen-Containing Functional Plasma Polymers

“…[51,53] Similar results were obtained by Corbella et al [54,55] For hydrocarbon plasmas, it could be demonstrated that mainly plasma chemistry affects the deposited mass over a broad parameter range yielding dense barrier coatings. [49,[56][57][58][59] Despite the fact that the same apparent activation energy is obtained for both experimental series shown in Figure 3, the actual mass deposition rate per monomer flow is seen to vary with the actual C 2 H 4 flow rate. While the absolute mass deposition rate R m for the higher flow is still higher, R m /F is noticeably reduced.…”

Microplasma‐Based Treatment of Inner Surfaces in Microfluidic Devices

“…In the past it was already shown that atmospheric-pressure DBD-based PACVD processes can yield plasma polymers with high retention of the monomer structure, if precursors are used which are able to polymerize via a radical mechanism such as acrylic acid or glycidyl methacrylate, providing surfaces with electrophilic carboxy and epoxy groups, resp. [1,2]. In the meantime, many more monomers have been investigated and in many cases a high chemical selectivity of the deposition was found.…”

Diamond-like carbon coating of alternative metal alloys for medical and surgical applications

“…Reducing the bias voltage whilst maintaining the precursor ratio produces a film which shows further reduction in degradation by NaOH ( figure 3 d), however, the aluminium transfer through the film appears to be increased, table 1. This may be related to a reduction in microscopic pinholes defects with reduced bias which will reduce corrosion [19,20], but the polymer-like nature of the film and reduction in density from around 1.9 gcm -3 to approximately 1.4 gcm -3 may reduce the barrier efficacy [10,12].…”

“…Control of PECVD deposition parameters affects the sp 2 / sp 3 ratio, hydrogen content and clustering of sp 2 sites, leading to film properties that can range from polymer-like to diamond-like [12]. Substrate treatment and interlayers have an effect on film adhesion, integrity, wear and corrosion properties [13,14]; incorporation of species such as N, O, F, Ar and Si within the film have been shown to affect the coating properties, including surface energy, topography, defect density, diffusion barrier efficacy and biomedical compatibility [10,[15][16][17][18].…”

“…The risk of any adverse effects related to aluminium biocompatibility could potentially be overcome by coating the instruments with a diffusion barrier. Diamond-like carbon (DLC) has demonstrated biocompatibility [6] and has been shown to be effective as a diffusion barrier, including for biomedical implants such as cardiovascular stents, heart valves and orthopaedic devices [7][8][9][10]. In addition to the barrier properties to prevent corrosion and leaching of aluminium to biological tissue, the damage resistance of the coating is also important in the clinical environment to counter wear and tear from normal operation and cleaning procedures.…”