In order to study the effects of structural variability, nanoindentation experiments were performed in Norway spruce cell walls with highly variable cellulose microfibril angle and lignin content. Contrary to hardness, which showed no statistically significant relationship with changing microfibril angle and lignin content, the elastic modulus of the secondary cell wall decreased significantly ...

In the present research, nanoindentation, atomic-force microscopy and optical were used to study mechanical microgeometrical parameters of tooth tissues. A nanoindentation test unit equipped with Berkovich indenter was determine values reduced Young’s modulus indentation hardness both atomic force using a diamond probe on silicon cantilever human root cementum. Three areas cementum studied: cer...

1. Effect of Surface Roughness and Topography The possible role of surface roughness in influencing the nanoscale energy dissipation in bone was investigated both experimentally and computationally. The peak-to-valley heights of the topographical features measured from the tapping mode atomic force microscopy (AFM) images shown in Figs. 2a,d of the main manuscript (presumably mineral particles)...

Abstract The Oliver–Pharr method is maybe the most established to determine a material’s Young’s modulus and hardness. However, this has number of requirements that render it more challenging for hard stiff materials. Contact area frame stiffness have be calibrated every tip, surface contact accurately identified. calibration particularly prone inaccuracies since easily affected, e.g., by sampl...