Abstract
This paper shows that the viscoelasticity of a biomaterial in water is strictly evaluated by the atomic force microscope (AFM). The evaluation method utilizes the dependence of amplitude and phase lag of cantilever vibration on the viscoelasticity when the tip on the cantilever cyclically penetrates into the material. The penetration motion is given by the vibration of the fixed end of the cantilever. The vibration analyses are made, taking the effects of drag force by water on its natural frequency and damping coefficient into account. Equations which derivate the surface stiffness and the surface viscosity are expressed by functions of the amplitude and the phase lag of the cantilever vibration at its tip end.
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