AFM, FastScan Bio by Bruker
- ScanAsyst in Air/Fluid
- Tapping Mode in Air/Fluid
- Contact Mode in Air/Fluid
- Lateral Force Microscopy
- Nanomechanical Mapping (PeakForce QNM)
- Force Volume
- Electrical & Magnetic Lift Modes
- Max. diameter ca. 20 cm, thickness: max. 1.2 cm
- Maximum scan range: 90 μm x 90 µm in air, 30 µm x 30 µm in liquid
- Maximum scan height: ca. 3 µm
We use highly compressed hydroxyapatite pellets as a first order model system for the mineral phase of tooth enamel. These pellets, when properly prepared, feature locally a very low surface roughness below 1 nm (rms). Upon etching (e.g., as a part of a cleaning procedure), domains become visible due to different etching rates of differently oriented crystallites.
With the FastScan Bio, we are also able to map mechanical surface properties or adhesion forces. Adhesion force maps of hydroxyapatite surfaces reveal different forces on different grains. However, the origin of these differences is yet unknown and its exploration is part of our ongoing research.