Details

Autor(en) / Beteiligte

• Rehman, Muhammad Atiq Ur
• Munawar, Muhammad Azeem
• Schubert, Dirk W.
• Boccaccini, Aldo R.

Titel

Electrophoretic deposition of chitosan/gelatin/bioactive glass composite coatings on 316L stainless steel: A design of experiment study

Ist Teil von

• Surface & coatings technology, 2019-01, Vol.358, p.976-986

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Electrophoretic deposition (EPD) of composite coatings based on chitosan, gelatin and copper doped bioactive glass (Cu-BG) particles on 316L stainless substrates (SS) was investigated. Despite the fact that EPD offers easy control over the thickness and morphology of the produced coatings, the optimization of the EPD process is a tedious task due to the fact that a high number of variables (applied voltage, deposition time, distance between the electrodes, concentration of the suspension and pH of the suspension) is involved. Therefore, we used the Taguchi Design of Experiments (DoE) approach for accurate and economical process (reduced number of experiments) optimization. The suspension composition (chitosan, gelatin and Cu-BG ratio) and electric field related parameters (voltage and time) were optimized by L25 type Taguchi array. The best coatings were obtained at the applied voltage of 30 V, deposition time of 5 min and the concentration ratio between chitosan/gelatin was 50:50 (vol%). Scanning electron microscopy (SEM) images revealed that Cu-BG particles were fairly homogenously dispersed in the chitosan/gelatin matrix. Fourier transform infrared spectroscopy (FTIR) and energy dispersive spectroscopy confirmed the presence of chitosan, gelatin and Cu-BG particles (qualitatively). The tape test (ASTM D3359-97 and B571-97) elucidated the appropriate adhesion strength of coatings (obtained by EPD using optimized parameters) for orthopedic applications. Moreover, chitosan/gelatin/Cu-BG coatings exhibited suitable hydrophilicity. [Display omitted] •Key parameters for EPD of chitosan/gelatin and bioactive glass particles determined by design of experiment approach•Kinetics of electrophoretic deposition studied by Hamaker's model•EPD mechanism of chitosan/gelatin and bioactive glass proposed•Optimized coatings showed appropriate adhesion strength of coating to the substrate.•Optimized coatings exhibited suitable hydrophilicity.