Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 41 for “"Tapping Mode"”.
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Nonlinear Dynamics of Tapping Mode Atomic Force Microscopy
A mathematical model is developed to investigate the grazing dynamics of tapping mode atomic force microscopes (AFM) subjected to a base harmonic excitation. The nonlinear dynamics of the AFM microcantilever are studied in both of the monostable and bistable phases with the microcantilever tip …
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Cantilever Dynamic Analysis in Tapping Mode Atomic Force Microscopy
Tapping mode atomic force microscopy (AFM) is becoming popular in the area of biology, as well as for polymer and semiconductor materials science. Unlike other AFM techniques, it only makes intermittent contact with the sample, which largely reduces any potential surface damage to soft materials, …
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Non-Smooth Dynamics and Control of Tapping Mode Atomic Force Microscopy
… to a linear impacting oscillator, and a dynamic model of tapping-mode atomic force microscope ensures persistence of the grazing solution trajectory by preventing loss of stability through a discontinuity induced saddle-node bifurcation.
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Design and implementation of cantilever probe holder for tapping mode atomic force microscopy
… novel cantilever probe holder that is capable of tapping mode operation. The probe holder is implemented in a previously designed high-speed, large-range atomic force microscope (AFM). This AFM used a cantilever probe holder that was only capable of contact mode operation, placing limitations on …
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Exploring the Nonlinear Dynamics of Tapping Mode Atomic Force Microscopy with Capillary Layer Interactions
Central to tapping mode atomic force microscopy is an oscillating cantilever whose tip interacts with a sample surface. The tip-surface interactions are strongly nonlinear, rapidly changing, and hysteretic. We explore numerically a lumped-mass model that includes attractive, adhesive, and repulsive …
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A new model for electric force microscopy and its application for electrostatically generated phase difference in tapping mode AFM
The harmonic force balance method was used to model and simulate electric force microscopy (EFM) and electrostatically generated phase difference in tapping mode AFM (EPTA) measurements. Simulations show that the harmonic force balance approach matches and explains EFM and EPTA experimental results …
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In-situ analysis of polymer film coats using AFM and thermal probe methods
… However the novel technique of heated tip tapping mode was employed, which was able to resolve separate domains of the polymer blends, which appeared as nanophases. Heated tip tapping mode was further employed to determine changes in the surface morphology of film coated minitablets which …
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Nanotechnology: a systems and control approach
… scale. The AFM operating in the most common tapping-mode has a highly complex dynamics due to the nonlinear tip-sample interaction forces. A systems approach is proposed to analyze the tapping-mode dynamics. The systems perspective is further exploited to develop analytical tools for modeling …
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Nano-contact printing of DNA monolayers
… surface coverage was analyzed using tapping mode atomic force microscopy (AFM). The percent coverage of oligonucleotide was then calculated from the tapping mode AFM phase images. Two general trends were found. The oligonucleotide surface coverage on the master increased slightly, …
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Dynamics near discontinuity events in systems with hysteresis and systems with finite state resets
… thesis, we study the dynamics near grazing for a model of an atomic force microscope in tapping mode and a model of cell cycle mitosis. In particular, period one behavior is studied near grazing points corresponding to tangential contact with the discontinuity surface used to initiate capillary …
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Design and implementation of high-bandwidth, high-resolution imaging in atomic force microscopy
… design through a systems approach to design model-based control laws that can give major improvements in the performance and robustness of AFM imaging. First, we propose a cascaded control design approach to tapping mode imaging, which is the most common mode of AFM imaging. The proposed …
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Amphiphile Polyurethan-Makromere als Emulgatoren und Comonomere für die heterophasige Polymerisation hydrophober Monomere
… Partikelmorphologie konnte durch Festkörper-NMR modelliert werden. Durch Atomic Force Microscopy (AFM) im Tapping mode konnte die Oberfläche und die Phasenseparation der polymeren Phasen charakterisiert werden.
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Design of Heterogeneous Surfaces for Polymer Adsorption
… characteristics. Morphological measurements by tapping mode AFM revealed that when the dimension of surface heterogeneity was commensurate with the protein, the heterogeneity affected the adsorption characteristics significantly.
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Mechanical behavior of ultrastructural biocomposites
… of nanoindentation combined with in-situ tapping mode atomic force microscopy imaging was used to show the anisotropic nanoscale plastic behavior of single crystal aragonite for indentations into three mutually orthogonal planes.
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Admicellar Polymerization Of Calcium Carbonate And Its Performance In Drilling Fluids
… using Fourier Transform Infra-red (FTIR) or Tapping mode Atomic Force Microscopy (AFM). Nevertheless, application testing of low-polymer content admicellar polymerized CaCO 3 in drilling fluids shoincrease in mud viscosity and yield point with improved fluid loss control.
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Mapping of elastic modulus and hardness in Trochus niloticus seashell nacre by nanoindentation
… hardness for the indent areas were generated. Tapping mode Atomic Force Microscopy was performed on the indented nacre after a treatment of surface etching, which revealed the tablet boundaries in order to correlate qualitatively the topographical features with the properties distribution. The …
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Dynamik der Spitze-Probe Wechselwirkung bei der Rasterkraftmikroskopie
… der dynamischen Rasterkraftmikroskopie (AFM) im Tapping Mode (TMAFM) bei weichen Poymerproben beizutragen. Dazu wurde das Schwingungsverhalten des mit Elastomeren wechselwirkenden Cantilevers untersucht. Um eine genaue Analyse durchzuführen, wurden an verschiedenen Kautschuken und Elastomeren …
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DC magnetron reactive sputtering of low stress AlN piezoelectric thin films for MEMS application
… of the sputtered AIN films was assessed using tapping mode atomic force microscopy and scanning electron microscopy. Energetic particle bombardment of the growing film surface helped to yield dense crystalline films with zone T microstructure. Thermalization of the impinging particle flux …
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Novel Fluorous Hybrid Surface Modification Characterized by Wetting Dynamics, Morphology and Nanomechanics
… by X-ray Photoelectron Spectroscopy (XPS) and Tapping Mode Atomic Force Microscopy (TM-AFM) respectively. Contrast in phase images reflect the surface modulus and viscoelasticity, from which physical form or compositional differences may be deduced. These characteristics have also been explored …
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