Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk

Partnerzy

B. Wiese


Ostatnie publikacje
1.  Zeller-Plumhoff B., Gile M., Priebe M., Słomińska H., Boll B., Wiese B., Würger T., Willumeit-Römer R., Horst Meißner R., Exploring key ionic interactions for magnesium degradation in simulated body fluid – a data-driven approach, Corrosion Science, ISSN: 0010-938X, DOI: 10.1016/j.corsci.2021.109272, Vol.182, pp.1-109272-13, 2021

Streszczenie:
We have studied the degradation of pure magnesium wire in simulated body fluid and its subsets under physiological conditions to enable the prediction of the degradation rate based on the medium's ionic composition. To this end, micro-computed tomography and scanning electron microscopy with energy-dispersive X-ray spectroscopy were used, followed by a tree regression analysis. A non-linear relationship was found between degradation rate and the precipitation of calcium salts. The mean absolute error for predicting the degradation rate was 1.35 mm/yr. This comparatively high value indicates that ionic interactions were exceedingly complex or that an unknown parameter determining the degradation may exist.

Słowa kluczowe:
magnesium degradation, simulated body fluid, MicroCT, tree regression

Afiliacje autorów:
Zeller-Plumhoff B. - inna afiliacja
Gile M. - inna afiliacja
Priebe M. - inna afiliacja
Słomińska H. - IPPT PAN
Boll B. - inna afiliacja
Wiese B. - inna afiliacja
Würger T. - inna afiliacja
Willumeit-Römer R. - inna afiliacja
Horst Meißner R. - inna afiliacja
140p.
2.  Meyer S., Wolf A., Sanders D., Iskhakova K., Ćwieka H., Bruns S., Flenner S., Greving I., Hagemann J., Willumeit-Römer R., Wiese B., Zeller-Plumhoff B., Degradation analysis of thin Mg-xAg wires using X-ray near-field holotomography, Metals, ISSN: 2075-4701, DOI: 10.3390/met11091422, Vol.11, No.9, pp.1422-1-12, 2021

Streszczenie:
Magnesium–silver alloys are of high interest for the use as temporary bone implants due to their antibacterial properties in addition to biocompatibility and biodegradability. Thin wires in particular can be used for scaffolding, but the determination of their degradation rate and homogeneity using traditional methods is difficult. Therefore, we have employed 3D imaging using X-ray near-field holotomography with sub-micrometer resolution to study the degradation of thin (250 μm diameter) Mg-2Ag and Mg-6Ag wires. The wires were studied in two states, recrystallized and solution annealed to assess the influence of Ag content and precipitates on the degradation. Imaging was employed after degradation in Dulbecco’s modified Eagle’s medium and 10% fetal bovine serum after 1 to 7 days. At 3 days of immersion the degradation rates of both alloys in both states were similar, but at 7 days higher silver content and solution annealing lead to decreased degradation rates. The opposite was observed for the pitting factor. Overall, the standard deviation of the determined parameters was high, owing to the relatively small field of view during imaging and high degradation inhomogeneity of the samples. Nevertheless, Mg-6Ag in the solution annealed state emerges as a potential material for thin wire manufacturing for implants.

Słowa kluczowe:
X-ray computed tomography, magnesium-silver alloy, wire, degradation, near-field holotomography

Afiliacje autorów:
Meyer S. - inna afiliacja
Wolf A. - inna afiliacja
Sanders D. - inna afiliacja
Iskhakova K. - inna afiliacja
Ćwieka H. - IPPT PAN
Bruns S. - inna afiliacja
Flenner S. - inna afiliacja
Greving I. - inna afiliacja
Hagemann J. - inna afiliacja
Willumeit-Römer R. - inna afiliacja
Wiese B. - inna afiliacja
Zeller-Plumhoff B. - inna afiliacja
70p.

Kategoria A Plus

IPPT PAN

logo ippt            ul. Pawińskiego 5B, 02-106 Warszawa
  +48 22 826 12 81 (centrala)
  +48 22 826 98 15
 

Znajdź nas

mapka
© Instytut Podstawowych Problemów Techniki Polskiej Akademii Nauk 2024