Adhesion hysteresis in Dynamic Atomic Force Microscopy Physica
نویسندگان
چکیده
The effects of adhesion hysteresis in the dynamic-dissipation curves measured in amplitude-modulation atomic force microscopy are discussed. Hysteresis in the interaction forces is shown to modify the dynamics of the cantilever leading to different power dissipation curves in the repulsive and attractive regimes. Experimental results together with numerical simulations show that power dissipation, as measured in force microscopy, is not always proportional to the energy dissipated in the tip–sample interaction process.
منابع مشابه
Single atomic contact adhesion and dissipation in dynamic force microscopy.
By combining dynamic force microscopy experiments and first-principles calculations, we have studied the adhesion associated with a single atomic contact between a nanoasperity--the tip apex--and a semiconductor surface--the Ge(111)-c(2 x 8). The nanoasperity's termination has been atomically characterized by extensive comparisons of the measured short-range force at specific sites with the che...
متن کاملDynamic Surface Force Measurement. 2. Friction and the Atomic Force Microscope
The mechanism and geometry of force measurement with the atomic force microscope are analyzed in detail. The effective spring constant to be used in force measurement is given in terms of the cantilever spring constant. Particular attention is paid to possible dynamic effects. Theoretical calculations show that inertial effects may be neglected in most regimes, the exception being when relative...
متن کاملFriction, Adhesion, and Deformation: Dynamic Measurements with the Atomic Force Microscope
A selection of recent experimental and theoretical work involving the atomic force microscope is reviewed, with the focus being upon dynamic measurements. Four topics are covered: calibration techniques for the friction force microscope, quantitative measurements of friction and the effect of adhesion, measurement and theory for the deformation and adhesion of viscoelastic particles, and the in...
متن کاملCoupled molecular and cantilever dynamics model for frequency-modulated atomic force microscopy
A molecular dynamics model is presented, which adds harmonic potentials to the atomic interactions to mimic the elastic properties of an AFM cantilever. It gives new insight into the correlation between the experimentally monitored frequency shift and cantilever damping due to the interaction between tip atoms and scanned surface. Applying the model to ionic crystals with rock salt structure tw...
متن کاملRole of Surface Roughness in Hysteresis during Adhesive Elastic Contact.
In experiments that involve contact with adhesion between two surfaces, as found in atomic force microscopy or nanoindentation, two distinct contact force (P) vs. indentation-depth (h) curves are often measured depending on whether the indenter moves towards or away from the sample. The origin of this hysteresis is not well understood and is often attributed to moisture, plasticity or viscoelas...
متن کامل