Defect formation in thin polyelectrolyte films on polycrystalline NiTi substrates

Lackmann, J.; Regenspurger, Romy; Maxisch, Michael; Grundmeier, Guido; Maier, Hans Jürgen

doi:10.1016/j.jmbbm.2010.03.008

Cited by 12 publications

(2 citation statements)

References 78 publications

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“…A large part of these studies report on the Nitinol coating with a polymeric layer such as polyurethane, , poly( p -xylene) derivatives, phosphorylcholine, polyallylamine bisphosphonate, hyaluronan derivatives, polytetrafluoroethylene or polyethylene glycol derivatives , on which an antithrombogene agent such as heparin is often immobilized. Since the past few years, several publications report also on the formation of layer-by-layer assembly of polyanions and polycations into multilayers on Nitinol. − Another way commonly used to create a protective organic coating on oxides surfaces such as Nitinol is the formation of a self-assembled monolayer. Several publications report on the modification of the Nitinol oxide layer with organosilanes, organophosphonic acids, ,, and the use of such covalently grafted organic monolayers as adhesion promoters or polymerization initiators for the formation of a polymeric layer …”

Section: Introductionmentioning

confidence: 99%

Induction Heating Vs Conventional Heating for the Hydrothermal Treatment of Nitinol and Its Subsequent 2-(Methacryloyloxy)ethyl 2-(trimethylammonio)ethyl Phosphate Coating by Surface-Initiated Atom Transfer Radical Polymerization

Devillers

Barthélémy

Delhalle

et al. 2011

ACS Appl. Mater. Interfaces

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Nitinol is an alloy of great interest in general and especially in the biomedical field where many researches are aimed to improve both its corrosion resistance and its biocompatibility. In this work, we report on the advantage of an induction heating treatment in pure water compared to a conventional hydrothermal procedure. Both treatments lead to a hydroxylation of the surface, a decrease of the nickel amount in the outer part of the oxide layer, and a drastically decreased corrosion current density. However, the amount of surface hydroxyl groups is higher in the case of the induction heating treatment, which in turn leads to a denser grafting of atom transfer radical polymerization initiators and ultimately to a thicker 2-(methacryloyloxy)ethyl 2-(trimethylammonio)ethyl phosphate (MPC) polymer layer than in the case of conventional heating treatments. X-ray photoelectron spectroscopy (XPS), static contact angle, and polarization curves measurements as well as scanning electron microscopy (SEM) have been used to characterize the obtained modified surfaces.

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Section: Introductionmentioning

confidence: 99%

Induction Heating Vs Conventional Heating for the Hydrothermal Treatment of Nitinol and Its Subsequent 2-(Methacryloyloxy)ethyl 2-(trimethylammonio)ethyl Phosphate Coating by Surface-Initiated Atom Transfer Radical Polymerization

Devillers

Barthélémy

Delhalle

et al. 2011

ACS Appl. Mater. Interfaces

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“…Other EBSD studies were addressed to clarify possible reasons for fatigue failure of NiTi: a distinct dependence of defect formation on misorientation of neighboring grains was proved [64], and increased dislocation content was deduced after fatigue tests [44]. Additionally, EBSD was also used for processing evaluation.…”

Section: Innovation In Materials Science IImentioning

confidence: 99%

Application of Electron Backscatter Diffraction to Shape Memory Alloys

Bassani

2012

KEM

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This overview highlights very recent application of electron backscatter diffraction (EBSD) to shape memory alloys, as main investigation technique but also as ancillary technique for other characterization methods. Over the last two decades EBSD in the scanning electron microscope has become a powerful tool for the characterization of many materials and transformation. In the mean time, shape memory alloys (SMA) are continuously studied: from a theoretical point of view, in order to clarify unsolved fundamentals of their phase transformations and characterize or develop new SMA systems, and from an engineering point of view, to solve design and processing problems related to the continuously growing examples of applications. Application of EBSD to SMA, even if hindered by limitations generally found also in other metallic system when phase transformation and martensitic phases are involved, provided useful information for both research areas.

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Cytocompatibility evaluation ofNiMnSn meta‐magnetic shape memory alloys for biomedical applications

et al. 2015

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Recently, magnetic shape memory alloys (MSMAs) have emerged as an interesting extension to conventional shape memory alloys (SMAs) due to their capacity to undergo reversible deformation in response to an externally applied magnetic field. Meta-magnetic SMAs (M-MSMAs) are a class of MSMAs that are able to transform magnetic energy to mechanical work by harnessing a magnetic-field induced phase transformation, and thus have the capacity to impose up to 10 times greater stress than conventional MSMAs. As such, M-MSMAs may hold substantial promise in biomedical applications requiring extracorporeal device activation. In the present study, the cytotoxicity and ion release from an Ni50 Mn36 Sn14 atomic percent composition M-MSMA were evaluated using NIH/3T3 fibroblasts. Initial studies showed that the viability of cells exposed to NiMnSn ion leachants was 60 to 67% of tissue culture polystyrene (TCP) controls over 10 to 14 days of culture. This represents a significant improvement in cytocompatibility relative to NiMnGa alloys, one of the most extensively studied MSMA systems, which have been reported to induce 80% cell death in only 48 h. Furthermore, NiMnSn M-MSMA associated cell viability was increased to 80% of TCP controls following layer-by-layer alloy coating with poly(allylamine hydrochloride)/poly(acrylic acid) [PAH/PAA]. Ion release measures revealed that the PAH/PAA coatings decreased total Sn and Mn ion release by 50% and 25%, respectively, and optical microscopy evaluation indicated that the coatings reduced NiMnSn surface oxidation. To our knowledge, this study presents the first cytotoxicity evaluation of NiMnSn M-MSMAs and lays the groundwork for their further biological evaluation. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 853-863, 2016.

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Defect formation in thin polyelectrolyte films on polycrystalline NiTi substrates

Cited by 12 publications

References 78 publications

Induction Heating Vs Conventional Heating for the Hydrothermal Treatment of Nitinol and Its Subsequent 2-(Methacryloyloxy)ethyl 2-(trimethylammonio)ethyl Phosphate Coating by Surface-Initiated Atom Transfer Radical Polymerization

Induction Heating Vs Conventional Heating for the Hydrothermal Treatment of Nitinol and Its Subsequent 2-(Methacryloyloxy)ethyl 2-(trimethylammonio)ethyl Phosphate Coating by Surface-Initiated Atom Transfer Radical Polymerization

Application of Electron Backscatter Diffraction to Shape Memory Alloys

Cytocompatibility evaluation ofNiMnSn meta‐magnetic shape memory alloys for biomedical applications

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