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Poster

Surface modification of magnesium-based foams by Directed Plasma Nanosynthesis

Wednesday (24.10.2018)
19:57 - 20:00
Part of:
Line-Up:
- Poster Battery housings for electric vehicles using CFRP and aluminium foam 0 Joachim Baumeister
- Poster Manufacturing and characterization of open-cell stainless steel foams by investment casting 1 Jan Frömert
- Poster Interface formation of Mg2X (X = Si, Sn) in cellular Si infiltrated by Mg(Sn) alloys 1 Alexander M. Matz
- Poster Production of microcellular PMMA using the bead foaming technology 1 Mikel Mugica
- Poster Nanocellular PMMA with tunable cellular structure by changing the rheological behaviour of the polymer matrix. 1 Judith Martín de León
- Poster Production of thermoplastic polyurethane foams synthesized with different contents of hard segment and graphene nanoplatelets by the gas dissolution foaming process 1 Ph.D. Mercedes Santiago-Calvo
- Poster Surface functionalized filters for aluminum melt filtration 1 Dr.-Ing. Claudia Voigt
- Poster Nanocellular polymers based on PMMA/sepiolite nanocomposites: characterization of the mechanical behaviour 1 Victoria Bernardo
- Poster Impact resistant foams based on PP/POE blends 1 Ph.D. Santiago Munoz Pascual
- Poster Crosslinked open cell ethylene butyl acrylate copolymer (EBA) foams: properties and applications 1 Ph.D. Eduardo López
- Poster Influence of molecular weight in the solubility,diffusivity and the subsequent cellular structure of polystyrene foams 1 Ph.D. Alberto Ballesteros
- Poster Crushing strength measurement at reticulated ceramic foams ex situ and in situ CT analysis 1 Dr.-Ing. Claudia Voigt
- Poster Initiation of plateau region during compression test of porous metals with aligned unidirectional pores 1 Tomoya Tamai
- Poster Active meta-materials with adjustable pore size 1 Dr. Reza Hedayati
- Poster Polymeric foams 3D numerical mechanical modelling 1 Stefano Tagliabue
- Poster Characterisation of NiTi cellular materials fabricated by the powder-metallurgy spaceholder technique 1 Dr. Karl Dahm
- Poster Accurate separation of open cell metal foams using remote laser cutting technique 1 Robert Baumann
- Poster Generation of artificial foam structures and evaluation of their thermo-mechanical, flow and filtration characteristics (Poster) 1 Christoph Settgast
- Poster Surface modification of magnesium-based foams by Directed Plasma Nanosynthesis 1 Viviana Marcela Posada Pérez

General Topic P: Postersession
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An ideal bioresorbable foam for bone replacement should have porous structure similar to the architecture of natural bones, suitable mechanical properties, and resorb in the body entirely after a proper healing time. Magnesium satisfies these conditions in combining both biocompatible and bioresorbable properties simultaneously while accelerating bone regeneration [1]. Its natural degradation property can avoid the need for a second surgical procedure to remove the implant. However, since magnesium resorbs too fast it is crucial to retard the surface corrosion mostly in the early stage of bone growth to avoid hydrogen release and enhance tissue integration [2].

 

In the present work, AZ31 foams with 65% porosity and 420 µm pore size, prepared by infiltration casting, were modified by Directed Plasma Nanosynthesis (DPNS) at different low energy irradiation values. This surface modification varied the amount of Al content on the near surface and created dynamic interactions between the foam surface and the environment when exposed to simulated body fluid. Moreover, a specific combination of DPNS parameters, 400 eV ion energy and 1E18 fluence, led to the growth of a bioactive and corrosion protective hydroxyapatite interface while maintaining bulk architected foam metal properties.

 

The corrosion process and bioactivity of the obtained surfaces were tested in vitro. Then, the micro and nanostructural properties, the developed phases, and their morphology were evaluated by SEM/EDS, XPS, and XRD. The in vitro biocompatibility tests were performed using bone marrow-derived mesenchymal stem cells. Cell viability was evaluated by Alamar blue after 1, 4, and 7 days. Cell morphology was evaluated by SEM and immunostaining using DAPI and Texas-Red-X Phalloidin. As a result, the interaction between the irradiation parameters and the immersion medium tune the surface properties and therefore, the corrosion resistance and bioactive properties. Hence, DPNS can be used to tailor desired conversion surfaces and cellular responses.

Speaker:
Viviana Marcela Posada Pérez
University of Illinois at Urbana-Champaign
Additional Authors:
  • Prof. Patricia Fernández-Morales
    Universidad Pontificia Bolivariana
  • Prof. Juan Ramírez
    Universidad Nacional de Colombia
  • Dr. Ana Civantos
    University of Illinois at Urbana-Champaign
  • Dr. Akshath R Shetty
    University of Illinois at Urbana-Champaign
  • Prof. Jean Paul Allain
    University of Illinois at Urbana-Champaign