Mechanical property and corrosion resistance of zirconia/polydopamine nanocomposite multilayer films fabricated via a novel non‐electrostatic layer‐by‐layer assembly technique

Abstract

and Shengrong Yang a Zirconia/polydopamine (ZrO 2 /PDA) nanocomposite multilayer films were constructed on Si substrate via a novel nonelectrostatic layer-by-layer (NELBL) assembly technique. The building block of this technique is the newly reported dopamine molecule, which can be attached to almost all material surfaces and undergo oxidation-polymerization to form PDA layers; more importantly, the outer hydroxyl groups of the PDA layer can chelated with certain inorganic oxide nanoparticles to generate oxide films. Thus, ZrO 2 /PDA nanocomposite multilayer films were fabricated by sequential NELBL deposition of PDA and ZrO 2 nanoparticles. The formation of the ZrO 2 /PDA nanocomposite multilayer films was monitored by the water contact angle (WCA) and ellipsometric thickness measurements, while the microstructure of the fabricated films was analyzed by means of atomic force microscope (AFM), field emission scanning electron microscope (FESEM), X-ray photoelectron spectrum (XPS), and X-ray diffraction (XRD) analysis. The mechanical and anticorrosion behaviors of the annealed ZrO 2 /PDA nanocomposite multilayers were found to be greatly enhanced as compared with that of the annealed homogeneous ZrO 2 film. The better mechanical and anticorrosion behaviors of the annealed ZrO 2 /PDA nanocomposite multilayers than the annealed homogeneous ZrO 2 film may be closely related to their special microstructure. Namely, the organic-inorganic hybrid microstructure of the annealed ZrO 2 /PDA nanocomposite multilayers may largely account for the increased nanohardness and corrosion resistance. Copyright

High‐Performance TiO2 Nanoparticle/DOPA‐Polymer Composites

“…We demonstrate in this contribution that blending these DOPA‐polymers with a dense, ordered multilayer matrix of metal oxide NPs leads to a nanocomposite with high mechanical strength. We note that the nanocomposite studied here is (i) fully transparent, (ii) the inorganic component can easily be replaced by other metal oxides (e.g., by CeO 2 , ZrO 2 or Fe 2 O 3 ) and (iii) that the metal oxide nanoparticles contained in these mixed matrices retain their specific surface activity …”

One-step synthesis of silver/dopamine nanoparticles and visual detection of melamine in raw milk

“…30 The polydopamine coatings, in turn, support a variety of reactions with organic species for the creation of functional organic ad-layers. 31,32 For example, they can react with thiols and amines via Michael addition or Schiff base reactions. 30 Based on the unique property of dopamine, we suggest that the detection of melamine could be achieved during the formation of AgNPs, namely, the synthesis, functionalization of AgNPs and the analysis of melamine can occur in one-step just by using dopamine as both reducer and stabilizer for the generated AgNPs.…”

Oberflächenmodifizierung von Wasseraufbereitungsmembranen

“…Bei Verwendung von Siliciumdioxid als Substrat wurde eine Filmwachstumsrate von 3.6 nm h −1 gefunden (siehe Abbildung ), obwohl die Verringerung der Eintauchdauer von 15 min auf 5 min die Abscheidungsrate auf bis zu 7 nm h −1 erhöhte . Die resultierenden Beschichtungen waren enorm robust und beständig gegenüber mechanischem, chemischem und elektrochemischem Abbau . Um diese Beschichtungen zu entfernen, waren typischerweise stark alkalische oder oxidierende Lösungen erforderlich.…”

“…Um diese Beschichtungen zu entfernen, waren typischerweise stark alkalische oder oxidierende Lösungen erforderlich. Polydopamin‐Beschichtungen zeigten bei Anwendung auf Edelstahl‐, Kupfer‐ und Silicium‐Substraten eine gute Korrosionsbeständigkeit.…”