Effect of strain on NiTi surface-optical reflectivity

Danilov, A.; Tuukkanen, Tuomas; Tuukkanen, Juha; Jämsä, Timo

doi:10.1051/jp4:2004115034

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“…This fact was confirmed by the DSC tests, which revealed two martensitic transformations on the samples after mechanical processing and only one transformation after the annealing. The same effect was observed in experiments, where MT was separately studied on the surface of the bulk of material 29…”

Section: Discussionsupporting

confidence: 70%

“…The same effect was observed in experiments, where MT was separately studied on the surface of the bulk of material. 29 The observed difference in surface roughness between austenite and martensite, martensite surface being rougher, possibly has an effect on the wettability of these surfaces. In addition, the observed trend in the measurements of larger contact angles and smaller surface energy on martensite also indicates that the wettability of the Nitinol alloy is lower on the martensite phase compared with austenite (martensite being more hydrophobic).…”

Section: Discussionmentioning

confidence: 97%

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Fibronectin modulates osteoblast behavior on Nitinol

Muhonen

Fauveaux

Olivera

et al. 2008

J Biomedical Materials Res

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We have previously demonstrated that primary rat osteoclasts behave differently when cultured on austenite and martensite Nitinol. In this study, we coated the two phases of Nitinol with plasma fibronectin and studied if this modifies the proliferation and cell cycle of MC3T3-E1 osteoblasts. The influence of the crystalline structure of Nitinol on the remodeling and conformation of fibronectin was also studied. The results on austenite demonstrated that fibronectin was more strongly remodeled and the cells spread better compared with the martensite phase. Interestingly, the conformation of the protein showed no differences between austenite and martensite. In addition, fibronectin improved cell proliferation in both phases, but the effect of fibronectin coating was stronger on the austenite surface. In addition, in both Nitinol phases, the proportion of cells in the G(1) phase was observed to grow in the presence of fibronectin. This could indicate cell differentiation on Nitinol.

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Section: Discussionsupporting

confidence: 70%

Section: Discussionmentioning

confidence: 97%