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Visualization of the Interface between Cell and Ceramic Coating by Electron Microscopy and Tomography Techniques

100%

Karbowniczek J., Gruszczyński A., Kruk A., Czyrska-Filemonowicz A.

Acta Physica Polonica A

2017

vol. 131

issue 5

1357-1360

To improve the stability of bone-material connection various surface modifications are applied to titanium based implants. Such new biomaterials require detailed characterization, including their biocompatibility. In the present study focused ion beam-scanning electron microscope tomography was applied to investigate the internal structure of ceramic coating as well as cell-material interface. Focused ion beam-scanning electron microscope tomography involves repeated focused ion beam milling and subsequent scanning electron microscope imaging of exposed sample surface and is followed by 3D reconstruction. This approach enables receiving additional information about the sample, unavailable at 2D images. The qualitative and quantitative investigation of pores in the ceramic coating was performed. The porosity of investigated volume: 8.5× 1.1× 3.9 μm³ was calculated as 24%. Additionally, based on 3D reconstruction the visualization of the coherent interface between cell and ceramic coating was done.

Micromechanics Investigation of Wood Cell Walls under Compression Loading

75%

Günay E., Golmohammadi H.

Acta Physica Polonica A

2016

vol. 129

issue 4

459-463

The aim of this study was to detect the determinations of the 3D cell deformations of pine wood (Pinus sylvestris L.) in micro-scale(µm) under mechanical compression loading. The 20× 20× 50 mm^3 sized wood specimens were tested under compressive pressure load through 35-40 MPa parallel to the grain orientations. The pressure applied samples were divided into three parts, then processed to form smaller cubic pieces and this pieces stained with gold liquid in order to get scanning electron microscopy images (12× 12× 12 mm^3 parts). The deformed cells were photographed in 3D-plane with magnification of (100×), (1500×) and in the range of 3.0-5.0 kV light voltage under the scanning electron microscope. Unloaded and loaded pine wood specimens were visualized and photographed to observe and examine the contraction or expansion of the cell walls comparatively. Based on the experimentally obtained microstructural permanent deformations of the cell structures, a numerical model had been proposed to explain the complex behaviour of cell structures under compression loading. Using the finite element method and ANSYS code, the permanent deformation ratios of three different pinewood cell models were simulated for 35-40 MPa loading to explain the overall stiffness and strength of the pinewood cells. In this way, by considering the results obtained from scanning electron microscopy measurements and related finite element analysis solutions, permanent deformation of honeycomb type pinewood cells was examined in detail.

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2 Acta Physica Polonica A

1 2017

1 2016

1 Czyrska-Filemonowicz A.

1 Golmohammadi H.

1 Gruszczyński A.

1 Günay E.

1 Karbowniczek J.

1 Kruk A.

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Visualization of the Interface between Cell and Ceramic Coating by Electron Microscopy and Tomography Techniques

Micromechanics Investigation of Wood Cell Walls under Compression Loading