Corrosion and bioactivity evaluation of nanocomposite PCL-forsterite coating applied on 316L stainless steel

Applying Baghdadite/PCL/Chitosan Nanocomposite Coating on AZ91 Magnesium Alloy to Improve Corrosion Behavior, Bioactivity, and Biodegradability

“…The results showed that applying the polymer coating to the anodized AZ91 alloy reduced the wettability angle from 86° ± 1° to 33° ± 1.3°, whereas adding baghdadite nanoparticles increased the wettability angle to 66° ± 1.3 ° in the presence of 5 wt % baghdadite ( Figure 5 and Table 3). Considering the fact that wetting angles between 0 to 90 show a hydrophilic surface [25], it can be concluded that all the specimens have a hydrophilic surface. Although the addition of baghdadite nanoparticles increased the wetting angle, the coating maintained its hydrophilic state in all samples.…”

“…One of the polymers that attracted the attention of scientists is polycaprolactone (PCL) due to its high mechanical properties as well as its stability in vivo [23,24]. However, this synthetic polymer has low hydrophobicity and cell affinity, which adversely affect its bonding to surrounding tissue [25]. To address this problem, composites of PCL with bioactive ceramics have been developed to improve cell adhesion and bonding to surrounding tissue.…”

Bioactivity Behavior Evaluation of PCL-Chitosan-Nanobaghdadite Coating on AZ91 Magnesium Alloy in Simulated Body Fluid

“…The wettability test was carried out, using an angle finder, in order to investigate the effect of baghdadite nanoparticles on the hydrophilic or hydrophobic behavior of the applied polymer coating on the AZ91 samples [19]. In each of the tests, a droplet of 2 μL (water) was laid on the surface of the samples, using a DragonLab StepMate stepper (model: JV62782, DragonLab, Beijing, China).…”

“…The average wettability angle was reported, using ImageJ software (version 1.52q). In order to examine the surface roughness before and after coating, a Mitutoyo roughness meter (Model: SJ-210, Grainger, Chicago, IL, USA) was used, and the mean surface roughness (Ra) was reported [19,28]. Figure 1a shows the TEM image of the produced baghdadite nanoparticles.…”

“…In fact, applying polymer coatings can create a smooth surface that is free of any porosities [16,17]. In addition to their high mechanical properties, ceramic-polymer composite coatings form a structure with similar morphology to that of bone, which enhances bioactivity and biocompatibility of implants [17][18][19].…”