Layer by layer assembled chitosan (TiO2)-heparin composite coatings on MAO-coated Mg alloys

2020 ◽  
Vol 281 ◽  
pp. 128640
Author(s):  
Yang Chen ◽  
Jing Wang ◽  
Jinhe Dou ◽  
Huijun Yu ◽  
Chuanzhong Chen
Keyword(s):  
Composite Coatings ◽  
Mg Alloys ◽  
Layer By Layer

scholarly journals Layer-by-Layer Self-Assembly Composite Coatings for Improved Corrosion and Wear Resistance of Mg Alloy for Biomedical Applications

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 515
Author(s):  
Tongfang Liu ◽  
Song Rui ◽  
Sheng Li
Keyword(s):  
Wear Resistance ◽  
Self Assembly ◽  
Biomedical Applications ◽  
Composite Coatings ◽  
Covalent Bond ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Layer By Layer ◽  
Corrosion Propagation ◽  
Chemical Linkage

Mg alloys are promising biomedical metal due to their natural degradability, good processability, and favorable mechanical properties. However, the poor corrosion resistance limits their further clinical applications. In this study, the combined strategies of surface chemical treatment and layer-by-layer self-assembly were used to prepare composite coatings on Mg alloys to improve the biocorrosion resistance. Specially, alkalized AZ91 Mg alloy generated chemical linkage with silane via Si–O–Mg covalent bond at the interface. Subsequently, Si–OH group from silane formed a crosslinked silane layer by Si–O–Si network. Further chemical assembly with graphene oxide (GO), lengthened the diffusion pathway of corrosive medium. The chemically assembled composite coatings could firmly bond to Mg alloy substrate, which persistently and effectively acted as compact barriers against corrosion propagation. Improved biocorrosion resistance of AZ91 Mg alloy with self-assembly composite coatings of silane/GO was subsequently confirmed by immersion tests. Besides, the Mg alloy exhibited good wear resistance due to outside layer of GO with a lubricant effect. Cell viability of higher than 75% had also been found for the alloy with self-assembly composite coatings, which showed good cytocompatibility.

Molecular Composite Coatings on Nafion Using Layer-by-Layer Self-Assembly

2015 ◽  
Vol 7 (19) ◽  
pp. 10365-10373 ◽  
Author(s):  
Christophe J. Lefaux ◽  
Byoung-Suhk Kim ◽  
Narayanan Venkat ◽  
Patrick T. Mather
Keyword(s):  
Self Assembly ◽  
Composite Coatings ◽  
Layer By Layer

scholarly journals Stable TiO2–USY zeolite composite coatings for efficient adsorptive and photocatalytic elimination of geosmin from water

2015 ◽  
Vol 3 (5) ◽  
pp. 2258-2264 ◽  
Author(s):  
Lik H. Wee ◽  
Nikki Janssens ◽  
Jeori Vercammen ◽  
Lorenzo Tamaraschi ◽  
Leen C. J. Thomassen ◽  
...  
Keyword(s):  
Composite Coatings ◽  
Dip Coating ◽  
Layer By Layer ◽  
Usy Zeolite ◽  
Zeolite Composite

Layer by layer dip-coating fabrication of robust TiO2–USY zeolite composite coatings for efficient adsorptive and photocatalytic elimination of geosmin up to 99%.

STRATIFICATION MECHANISM AND INTERFACE CHARACTERIZATION OF (TiN), (TiC)/NiCrBSi COMPOSITE COATINGS SYNTHESIZED BY LASER REMELTING

2004 ◽  
Vol 11 (03) ◽  
pp. 291-295 ◽  
Author(s):  
RONGXIANG LIU ◽  
TINGQUAN LEI ◽  
LIXIN GUO
Keyword(s):  
Heat Affected Zone ◽  
Composite Coatings ◽  
Layer By Layer ◽  
Laser Remelting ◽  
X Ray Diffraction ◽  
Interface Characterization ◽  
Flow Characterization ◽  
Clad Layer ◽  
Nicrbsi Coating

TiC / TiN -reinforced composite coatings were fabricated on the substrate of Ti – 6Al – 4V alloy using laser remelting. X-ray diffraction (XRD) was used to identify the phases in the laser-clad composite coating; the interface characterization of the dilution zone-clad zone (IDC) and the dilution zone-heat-affected zone (IDH) was observed with a scanning electron microscope (SEM). The results show that the microstructure of a cross-section has stratification characterization, and consists of the clad zone (CZ), the dilution zone (DZ), the diffusion layer (DL) and the heat-affected zone (HAZ). The layer-by-layer microstructure results from the boundary layer phenomenon of viscous melt-fluid and diffusion. The kind of reinforced particle has an effect on the interface morphology, microstructure and flow characterization of the melt-fluid. The phase constitution in the clad zone consists of ( Cr – Ni – Fe ), TiC , Ni 4 B 3, Ti 2 Ni , Cr 2 B and M 23 C 6 for TiC + NiCrBSi coating, and ( Cr – Ni – Fe ), TiN , NiB , Cr 2 Ti and Ti 2 Ni for TiN + NiCrBSi coating. The interfaces of the IDC in the NiCrBSi -clad layer is clear and clean; those of TiC + NiCrBSi and TiN + NiCrBSi are illegible. Ti – Ni phases with acicular microstructure link dilution zone and clad zone, and two kinds of phase with acicular microstructure, are similar in composition and shape.

Electrodeposition of alginate/chitosan layer-by-layer composite coatings on titanium substrates

2014 ◽  
Vol 103 ◽  
pp. 38-45 ◽  
Author(s):  
Zhiliang Wang ◽  
Xueqin Zhang ◽  
Juming Gu ◽  
Haitao Yang ◽  
Jun Nie ◽  
...  
Keyword(s):  
Composite Coatings ◽  
Layer By Layer ◽  
Layer Composite ◽  
Titanium Substrates

Catechol-based layer-by-layer assembly of composite coatings: a versatile platform to hierarchical nano-materials

Soft Matter ◽  
2015 ◽  
Vol 11 (31) ◽  
pp. 6173-6178 ◽  
Author(s):  
C. X. Wang ◽  
A. Braendle ◽  
M. S. Menyo ◽  
C. W. Pester ◽  
E. E. Perl ◽  
...  
Keyword(s):  
Composite Coatings ◽  
Layer By Layer ◽  
Nano Materials ◽  
Layer By Layer Assembly ◽  
Layer Assembly

scholarly journals Corrosion and biocompatibility behaviours of microarc oxidation/phytic acid coated magnesium alloy clips for use in cholecystectomy in a rabbit model

RSC Advances ◽  
2021 ◽  
Vol 11 (34) ◽  
pp. 20730-20736
Author(s):  
Qiuxia Zheng ◽  
Zongbin Sun ◽  
Zhanhui Wang ◽  
Tinghe Duan ◽  
Kai Xu ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Phytic Acid ◽  
Cystic Duct ◽  
Composite Coatings ◽  
Rabbit Model ◽  
Microarc Oxidation ◽  
Cystic Artery ◽  
Mg Alloys

Mg alloys with microarc oxidation/phytic acid composite coatings were tested as degradable ligation clips for ligating the cystic duct and cystic artery.

scholarly journals Estimation of the Elasticity Modulus of Composite Electroplated Coatings during Their Layer-by-Layer Deposition

2021 ◽  
Vol 31 (3) ◽  
pp. 430-448
Author(s):  
Sergey Yu. Zhachkin ◽  
Anatoliy I. Zavrazhnov ◽  
Nikita A. Penkov ◽  
Alexei V. Martynov ◽  
Roman N. Zadorozhny
Keyword(s):  
Elasticity Modulus ◽  
Friction Pair ◽  
Composite Coatings ◽  
Multilayer Coating ◽  
Point Of View ◽  
Practical Significance ◽  
Complete Agreement ◽  
Layer By Layer ◽  
Stiffness Coefficients ◽  
Operation Conditions

Introduction. To keep automobiles and tractors in operation conditions, it is necessary to restore the inner cylindrical surfaces of the friction pair parts. This is the most laborintensive activity. The method of electroplated contact deposition of composite coatings, based on elastic plastic deformation of formed layers, is used for repairing surfaces. To use this method it is necessary to determine the values of the elasticity modulus, on which the wear resistance of tribocouplings depends. Materials and Methods. For the study, cylindrical samples made of 30 HGSA and 30 HGSNA steels were used. Electrolyte containing 200–250 g/l chromium oxide, 2.0–2.5 g/l sulfuric acid, and distilled water was used for electroplating the coatings. When calculating the stress-strain state, the apparatus of continuum mechanics was used. Results. The dependence of the coating pliability as a function of the parameters of individual elementary layers is determined. When the multilayer coating of three types (orthogonal-reinforced, cross-reinforced and quasi-isotropic) is applied, its structure does not depend on the angles of kinematic tool movement on the inner cylindrical surface of the part. For each type of coatings, the way to determine the constant stiffness coefficients of the layers is specified. The dependences for calculating the elasticity modulus of the applied material are derived from the values of the stiffness coefficients. Discussion and Conclusion. In determining the modulus of elasticity of multilayered composite coatings, the calculation is made for the individual layers by passing to the convective coordinates, which is in complete agreement with the Lagrange point of view on the study of the motion of a continuous medium. The results obtained are of practical significance in the selection of the coating material to be applied for the restoration of internal cylindrical surfaces.

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