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 118 for “"Atomic Force Microscope (AFM)"”.
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In Situ Structural Study of Underpotential Deposition and Electrocatalysis on Gold(111) Electrodes
… on Au(111) electrodes. The application of the atomic force microscope (AFM), the scanning tunneling microscope (STM), and the surface x-ray scattering (SXS) to these UPD studies has provided in situ measurements from which we investigate factors that determine UPD surface structures and …
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Mechanical properties of dense suspensions: Variations with interaction potential
… in the solutions. The normal and frictional forces between pairs of the silica particles were measured directly with an atomic force microscope (AFM). The rheology of suspensions of the particles was studied with a constant stress rheometer.
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CRYOGENIC ATOMIC FORCE MICROSCOPE FOR CHARACTERIZATION OF NANOSTRUCTURES
… the design and applications of a cryogenic atomic force microscope (AFM) for characterization of nanostructures. The cryogenic AFM with a conductive tip can measure DC current through nanostructures. We use quartz tuning fork (QTF) as the force sensor. Unique coarse z motor design provides …
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Design, modeling and fabrication of contact stiffness calibration samples for CR-AFM
… calibrate the contact stiffness of an atomic force microscope (AFM) cantilever tip in contact with a surface, which is a critical step in the measurement of nano-mechanical properties. The calibration exploits the relationship between contact resonance (CR) frequency and contact …
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Transparent Platinum Counter Electrode for Building Integrated Dye-sensitized Solar Cells
… tin oxide/glass substrate. Scanning electron microscope (SEM) and atomic force microscope (AFM) images showed a large surface area for the nanoporous Pt nanoclusters. DSSCs with Pt-NP counter electrode had 6.17% power conversion efficiency, comparable to the 6.46% efficiency of the …
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Optical system for high-speed Atomic Force Microscope
… cantilever deflection sensor for a high speed Atomic Force Microscope (AFM). This optical sensing system is able to track a small cantilever while the X-Y scanner moves in the X-Y plane at 1KHz over a large range of 50x50 microns. To achieve these requirements, we evaluated a number of design …
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Thermodynamic Evidence That Ganglioside-Mediated Insertion Of Botulinum A Into The Cholinergic Nerve Ending May Precede Endocytosis And Acidification: A Langmuir Film Study
… the most potent toxins known to human kind. The Atomic Force Microscope (AFM) was employed to investigate the conditions under which BoNT type A heavy chain would bind and/or insert into mica supported dipalmitoylphosphatidylcholine (DPPC) lipid bilayers. As an alternate technique, DPPC/GT1b or …
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Tip steering of the Atomic Force Microscope.
The Atomic Force Microscope (AFM) is a powerful tool for the imaging of extremely small objects on the scale of nanometers, like carbon nanotubes and strands of DNA. There currently is a need for methods to actively steer the probe tip of the AFM in order to greatly reduce the time required to …
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Design and control optimization for high-speed jumping mode Atomic Force Microscope
… thesis, I improved the design of a high-speed Atomic Force Microscope (AFM) for jumping mode operation. The relations between important imaging parameters and physical limitations of the system were established first to identify the aspects of improvement. Two control algorithms to improve the …
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Design and implementation of cantilever probe holder for tapping mode atomic force microscopy
… 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 imaging speed and increasing the risk of probe tip damage. Therefore, the focus of this thesis presents …
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Control of Surface Chemistry of Gold, Pyrite and Pyrrhotite
… mechanism of xanthate adsorption on gold using Atomic Force Microscope (AFM), then the depression of pyrite and pyrrhotite using the synthetic polymers developed by Cytec Industries. The results show that for xanthate/gold system, dixanthogen is the only species that renders the surface …
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Feasibility of Single-Point Excitation Ultrasonic Force Microscopy
<p>We propose Multi-Probe Ultrasonic Force Microscopy (UFM) to create and detect the motion of tip-induced surface waves and thereby study nanoscale surface dynamics. Before committing to the construction of an instrument, we investigate the theoretical feasibility of such a novel instrument to …
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Micrometer-scale chemical analysis using heated AFM cantilever and mass spectrometer
… chemical analysis method using a heated atomic force microscope(AFM) cantilever and mass spectrometer. Simulations investigate the underlying transport mechanisms within the system and the impact of various design parameters. The way to optimize the system is suggested based on the …
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Characterization of electrical conductivity of carbon fiber/epoxy composites with conductive AFM and scanning microwave impedance microscopy
… conductivity of IM7 carbon fibers using two Atomic Force Microscope (AFM) –based techniques: Conductive AFM (C-AFM) and Scanning Microwave Impedance Microscopy (sMIM). Unidirectional IM7/977-3 carbon fiber/epoxy laminates were manufactured and examined with these two techniques. C-AFM was …
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The mechanical testing of single nanofiber
… fiber quality was explored in this study. The force applied on the nanofiber was measured with the help of AFM by satisfying Hooke's Law. The elastic properties of PLLA nanofiber were investigated with the atomic force microscope (AFM). The elasticity was calculated by analyzing the recorded …
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Utilizing Nanoporous Alumina Membranes for Molecular Transport and Silica Nanotube Synthesis
… membrane were studied using a scanning electron microscope (SEM) and an atomic force microscope (AFM). Infrared spectroscopy was used to confirm the presence of silane coupling with the alumina membrane. Silanes with variable functional groups, either hydrophobic (isobutyl trimethoxysilane, …
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Crosslinked conventional size and nanoparticle size acrylic latexes and their blends: Investigation of the effects of crosslinking, particle size and distribution, glass transition temperature and blending on film formation, properties and morphology
… scanning calorimeter (MDSC), nano-indenter, and atomic force microscope (AFM). The results showed significant improvements in acrylic latex performance proposing coatings near zero VOC and forming basis for exploring potential commercial applications of functional nanosize latexes and their …
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Surface mechanics of polyacrylamide hydrogels following wear
… on the surface using a colloidal probe in an atomic force microscope (AFM), and the elastic modulus is computed from the region of the curves fitting a Hertzian contact regime. The results show that the surfaces are stiffer directly after wear. These changes are recoverable, and after several …
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Direct and quantitative absorptive spectroscopy of nanowires
… nanostructures. This method is based on atomic force microscope (AFM) cantilever thermometry where a bimorph cantilever is used as a heat flux sensor. These sensors operate on the principle of a thermomechanical bending response and by virtue of their dimensionality, are capable of …
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AFM and C-AFM Studies of GaN Films
This thesis uses the techniques of atomic force microscope (AFM) and conductive AFM (C-AFM) to study the conduction properties of n-type GaN films. A total of 16 samples were examined and grouped according to their surface morphologies and conduction behaviors. The most common type of surface …
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