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Improving the radiopacity of Fe-Mn biodegradable metals by magnetron-sputtered W-Fe-Mn-C coatings:Application for thinner stents

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Bioactive Materials 2022年第6期7卷 64-70页

作者： Samira Ravanbakhsh Carlo Paternoster Gianni Barucca Paolo Mengucci Sofia Gambaro Theophraste Lescot Pascale Chevallier a Marc-Andre Fortin Diego Mantovani Laboratory for Biomaterials and Bioengineering Canada Research Chair I in Biomaterials and Bioengineering for the Innovation in SurgeryDepartment of Min-Met-Materials EngineeringResearch Center of CHU de QuebecDivision of Regenerative MedicineLaval UniversityQuebec CityQuebec G1V 0A6Canada Laboratory for Biomaterials in Imaging(BIM) Axe Medecine RegeneratriceCentre Hospitalier Universitaire(CHU)de Quebec-Universite Laval2705boul.Laurier(T1-61a)QuebecG1V 4G2Canada Department of Materials Environmental Sciences and Urban PlanningUniversita Politecnica delle Marchevia Brecce Bianche 1260131AnconaItaly National Research Council Institute of Condensed Matter Chemistry and EnergyCNR-ICMATEVia de Marini 616149GenovaItaly Departement de Genie des Mines de la Metallurgie et des MateriauxCentre de Recherche sur les Materiaux Avances(CERMA)Universite LavalQuebecG1V 0A6Canada Axe Medecine Regeneratrice Centre Hospitalier Universitaire(CHU)de Quebec-Universite Laval2705boul.Laurier(T1-61a)QuebecG1V 4G2Canada

In this exploratory work,micrometric radiopaque W-Fe-Mn-C coatings were produced by magnetron sputtering plasma deposition,for the first time,with the aim to make very thin Fe-Mn stents trackable by *** power of Fe-13Mn-1.2C target was kept constant at 400 W while that of W target varied from 100 to 400 W producing three different coatings referred to as P100,P200,*** effect of the increased W power on coatings thickness,roughness,structure,corrosion behavior and radiopacity was *** coatings showed a power-dependent thickness and W concentration,different roughness values while a similar and uniform columnar *** amorphous phase was detected for both P100 and P200 coatings while γ-Fe,bcc-W and W_(3)C phases found for ***,P200 and P400 showed a significantly higher corrosion rate(CR)compared to *** presence of W,W_(3)C as well as the Fe amount variation determined two different micro-galvanic corrosion mechanisms significantly changing the CR of coatings,0.26±0.02,59.68±1.21 and 59.06±1.16μm/year for P100,P200 and P400,*** P200 with its most uniform morphology,lowest roughness(RMS=3.9±0.4 nm)and good radiopacity(~6%)appeared the most suitable radiopaque biodegradable coating investigated in this study.

关键词： Fe-Mn-Based alloys degradable coatings W-Fe-Mn-C coatings Magnetron sputtering Radiopacity Stent fluoroscopy

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Review:Fabrication and Application of Zwitterion-based Functional coatings

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Journal of Harbin Institute of Technology(New Series) 2022年第6期29卷 9-26页

作者： Jinyan Tan Shuxue Zhou A.Catarina C.Esteves Limin Wu Department of Materials Science State Key Laboratory of Macromolecular EngineeringAdvanced Coatings Research Center of Ministry of Education of ChinaFudan UniversityShanghai 200433China Laboratory of Physical Chemistry Department of Chemical Engineering and ChemistryEindhoven University of TechnologyEindhoven 5600 MBThe Netherlands Institute for Complex Molecular Systems(ICMS) Eindhoven University of TechnologyEindhoven 5600 MBThe Netherlands

Zwitterion-based materials by virtue of their special physical and chemical characteristics have attracted researchers to utilize them for fabricating functional coatings. The simultaneous presence of positive and negative charges renders the zwitterion-based materials with electrostatically induced hydration properties, which enables a high resistance towards oily pollutants, nonspecific protein adsorption, bacterial adhesion and biofilm formation. This review starts from the working mechanism of zwitterions and covers the fabrication strategies of zwitterion-based functional coatings, namely the zwitterion-bearing binder route, the zwitterion-bearing additive route and the post-generation of coatings containing zwitterionic precursors. The applications of zwitterion-based functional coatings are discussed, including medical implants, marine antifouling and oil-resistant coatings, with focus on the relevant mechanisms of the zwitterion-containing coatings for a specific performance. Finally, some comments and perspectives on the current situation and future development of zwitterion-based functional coatings are given.

关键词： zwitterionic materials functional coatings medical implant coatings marine antifouling coatings oil-resistant coatings amphiphilic coatings degradable coatings

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