Improved biological performance of magnesium by micro-arc oxidation

Magnesium and its alloys have recently been used in the development of lightweight, biodegradable implant materials. However, the corrosion properties of magnesium limit its clinical application. The purpose of this study was to comprehensively evaluate the degradation behavior and biomechanical properties of magnesium materials treated with micro-arc oxidation (MAO), which is a new promising surface treatment for developing corrosion resistance in magnesium, and to provide a theoretical basis for its further optimization and clinical application. The degradation behavior of MAO-treated magnesium was studied systematically by immersion and electrochemical tests, and its biomechanical performance when exposed to simulated body fluids was evaluated by tensile tests. In addition, the cell toxicity of MAO-treated magnesium samples during the corrosion process was evaluated, and its biocompatibility was investigated under in vivo conditions. The results of this study showed that the oxide coating layers could elevate the corrosion potential of magnesium and reduce its degradation rate. In addition, the MAO-coated sample showed no cytotoxicity and more new bone was formed around it during in vivo degradation. MAO treatment could effectively enhance the corrosion resistance of the magnesium specimen and help to keep its original mechanical properties. The MAO-coated magnesium material had good cytocompatibility and biocompatibility. This technique has an advantage for developing novel implant materials and may potentially be used for future clinical applications.

Peak Force Kelvin Probe Force Microscopy Investigation of ZrO2 Nanocomposites for Hygroelectricity Power Element

ZrO2 nanocomposites were investigated considering their perspective application in hygroelectric power elements. Scanning probe microscopy (SPM) techniques allowed to visualize the surface topography and electrical properties. In this work was compared spacial charge behaviour of sample in humid and dry air conditions. Also different SPM modes were compared. Kelvin probe force microscopy (KPFM) was applied to characterize the spacial charge distribution on surface of the sample. Measurements showed, that trapped charge is not dissipated and can be manipulated with low voltages. Humidity influence on the electric potential of the sample was shown.

8/5/20, fête de Jeanne d'Arc à Orléans [procession place Ste Croix, le maréchal Foch avec, à sa gauche, le maire d'Orléans, Albert Laville] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59182

8/5/20, fête de Jeanne d'Arc à Orléans [procession religieuse place du Martroi] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59183

8/5/20, fête de Jeanne d'Arc à Orléans [Mgr Touchet salue le maréchal Foch] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59184

8/5/20, fête de Jeanne d'Arc à Orléans [procession religieuse rue Jeanne d'Arc] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59186

8/5/20, fête de Jeanne d'Arc à Orléans [parade militaire sur la place du Martroi] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59190

8/5/20, fête de Jeanne d'Arc à Orléans [parade militaire sur la place du Martroi] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59191

8/5/20, fête de Jeanne d'Arc à Orléans [parade militaire sur la place du Martroi] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59192

8/5/20, fête de Jeanne d'Arc à Orléans [évêques sur le parvis de la cathédrale] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59193

8/5/20, fête de Jeanne d'Arc à Orléans [les sénateurs Rabier, Donon et Roy, le préfet Gaston Allain et le maréchal Foch dans la tribune officielle, place du Martroi] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59194

8/5/20, fête de Jeanne d'Arc à Orléans [le maréchal Foch accompagné de notables dans une rue d'Orléans] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59197

8/5/20, fête de Jeanne d'Arc à Orléans [magistrats devant la mairie d'Orléans, ancien hôtel Groslot] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59198

13-6-20, Rouen, fêtes de Jeanne d'Arc, défilé des Alsaciennes Lorraines : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59685 bis

13-6-20, Rouen, fêtes de Jeanne d'Arc, drapeaux anglais et français : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59686