Near-Field Acoustic Microscopy

Hirsekorn, S.; Rabe, U.; Arnold, W.

doi:10.1051/epn/19962703093

Cited by 8 publications

(9 citation statements)

References 2 publications

(2 reference statements)

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“…Force modulation microscopy (FMM) was specifically introduced for the study of elastic and viscoelastic properties of materials with nanometrescale resolution [8,9]. Other AFM-based methods for mapping elasticity and adhesion have also been proposed [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], some of them particularly applied to polymer studies [e.g. 15,21], and developments in scanning probe technology based on thermal analysis techniques have been used to map thermally activated near-surface processes in polymeric materials [25,26].…”

Section: Polymer Toughened Polymersmentioning

confidence: 99%

Heterodyne force microscopy of PMMA/rubber nanocomposites: nanomapping of viscoelastic response at ultrasonic frequencies

Cuberes

Assender

Briggs

et al. 2000

J. Phys. D: Appl. Phys.

146

114

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We present measurements of the nanoscale elastic and viscoelastic properties of samples of poly(methylmetacrylate) (PMMA)/rubber nanocomposites. For these studies we have used a new technique based on atomic force microscopy (AFM) with ultrasonic excitation, heterodyne force microscopy (HFM), which provides a means of testing the viscoelastic response of polymeric materials locally (in tip-probed regions) at MHz frequencies. Phase-HFM contrast distinguishes local differences in the dynamic response of PMMA/rubber composites. Comparison of HFM with other AFM-based techniques (ultrasonic force microscopy, friction force microscopy and force modulation microscopy), while imaging the same surface region, emphasizes the unique capabilities of HFM for these kinds of studies, and reveals key nanostructural characteristics of the composites. Some of the toughening particles appear to be broken down, with areas of PMMA detached from the surrounding matrix.

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Section: Polymer Toughened Polymersmentioning

confidence: 99%

Heterodyne force microscopy of PMMA/rubber nanocomposites: nanomapping of viscoelastic response at ultrasonic frequencies

Cuberes

Assender

Briggs

et al. 2000

J. Phys. D: Appl. Phys.

146

114

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“…Parameters typical to those found in atomic-force microscopes previously examined were used. [5][6][7] The elastic modulus and density for ͗100͘ silicon, Eϭ169 GPa, ϭ2330 kg/m 3 , respectively, were used. The beam has width aϭ51 m, thickness bϭ1.5 m, and length Lϭ262 m. These values yield a first natural frequency of f 1 ϭ30 kHz ͑m FMA ϭ1.13ϫ10 Ϫ11 kg, k FMA ϭ0.404 N/m͒.…”

Section: Temporal Responsementioning

confidence: 99%

“…It is now recognized that these higher modes are often excited in experiments. [5][6][7] The complexities of the elastic beam vibrations have given rise to models that simplify the dynamics considerably. In one such approach the elastic beam equation is approximated with a one degree of freedom mass-spring model.…”

Section: Introductionmentioning

confidence: 99%

High-frequency response of atomic-force microscope cantilevers

Turner

Hirsekorn

Rabe

et al. 1997

Journal of Applied Physics

173

107

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Recent advances in atomic-force microscopy have moved beyond the original quasistatic implementation into a fully dynamic regime in which the atomic-force microscope cantilever is in contact with an insonified sample. The resulting dynamical system is complex and highly nonlinear. Simplification of this problem is often realized by modeling the cantilever as a one degree of freedom system. This type of first-mode approximation ͑FMA͒, or point-mass model, has been successful in advancing material property measurement techniques. The limits and validity of such an approximation have not, however, been fully addressed. In this article, the complete flexural beam equation is examined and compared directly with the FMA using both linear and nonlinear examples. These comparisons are made using analytical and finite difference numerical techniques. The two systems are shown to have differences in drive-point impedance and are influenced differently by the interaction damping. It is shown that the higher modes must be included for excitations above the first resonance if both the low and high frequency dynamics are to be modeled accurately.

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“…While in the regimes I and II a good agreement between experiment and simulation is obtained, the simulation data exhibits larger frequency shifts than the experiment in regime III. Possible reasons for this might originate in the spring constant, the function R or even the point mass model (compare with [12], [6]) not describing the experiment accurately enough.…”

Section: Model Calculations -mentioning

confidence: 99%

Tip-sample interactions in scanning force microscopy using the frequency-modulation technique: Experiments and computer simulation

1997

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The resonance frequency and the damping behaviour of a vibrating cantilever as used in dynamic Scanning Force Microscopy (SFM) is investigated with the frequency modulation (FM) technique. The properties of a silicon-cantilever/tip vibrating in front of a silicon surface were studied under UHV conditions as a function of the tip-sample distance. The experimental results are compared with a computer simulation. The different characteristic parts of the experimental curves can be interpreted in terms of attractive and repulsive forces acting on the cantilever as well as the behaviour of the amplitude control electronics. Using the computer simulation noncontact regimes can clearly be distinguished from intermittent contact regimes.

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Near-Field Acoustic Microscopy

Abstract: Analysis shows that acoustic imaging based on the detection of ultrasonic fields using a modified atomic force microscope operated in the near-field mode not only offers nanoscale resolution but also opens the way forward to elastic imaging.

Cited by 8 publications

References 2 publications

Heterodyne force microscopy of PMMA/rubber nanocomposites: nanomapping of viscoelastic response at ultrasonic frequencies

Heterodyne force microscopy of PMMA/rubber nanocomposites: nanomapping of viscoelastic response at ultrasonic frequencies

High-frequency response of atomic-force microscope cantilevers

Tip-sample interactions in scanning force microscopy using the frequency-modulation technique: Experiments and computer simulation

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