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.
Results
Showing 1 to 20 of 962 for “"Atomic force"”.
-
A metrological atomic force microscope
… fabrication, and testing of a metrological atomic force microscope (AFM). This design serves as a prototype for a similar system that will later be integrated with the Sub-Atomic Measuring Machine (SAMM) under development in collaboration with the University of North Carolina at Charlotte. …
-
Molecular assemblies observed by atomic force microscopy
… a prerequisite, the proteins must be adsorbed to atomically flat mica and densely packed in a membrane to restrict their lateral mobility. Atomically flat gold, engineered proteins, and chemically modified lipids were combined to rapidly assemble immobile and fully oriented samples. The resulting …
-
Image processing for precision atomic force microscopy
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
-
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 …
-
Accurate capacitive metrology for atomic force microscopy
… sensing metrology designed for a prototype atomic force microscope (AFM) originally developed in the MIT Precision Motion Control Lab. The capacitive measurements use a set of commercial capacitance sensors intended primarily for use against a flat target. In our design, the capacitance …
-
Nanocharacterization of Porous Materials with Atomic Force Microscopy
… of porous nanostructured surfaces. Especially, Atomic Force Microscopy (AFM) has been widely used due to its compatibility with non-conducting surfaces. In particular, AFM often complements other techniques like scanning and transmission electron microscopy by providing quantitative surface …
-
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 …
-
A modular atomic force microscope for nanotechnology research
The atomic force microscope (AFM) has become an essential tool in a wide range of fields, from materials science and semiconductor research to molecular biology. Various research efforts have enhanced the capabilities of this powerful instrument, which has enabled new insights into nanoscale …
-
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 …
-
Atomic Force Microscopy Study of Clay Mineral Dissolution
… with respect to acid dissolution using in situ atomic force microscopy (AFM). Three techniques are described which make it possible to fix these minerals and other small particles to a suitable substrate for examination in the fluid cell of the atomic force microscope. A suite of macros has also …
-
Nonlinear Dynamics of Tapping Mode Atomic Force Microscopy
… 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 being, respectively, located in the …
-
Development of the Evanescent Wave Atomic Force Microscope
The conventional atomic force microscope (AFM) is equipped with a single optical detection system. Probe-sample separation is determined in an independent deflection with respect to AFM z-translation experiment. This method of determining probe-surface separation is relative, susceptible to drift …
-
Novel probe structures for high-speed atomic force microscopy
Atomic Force Microscopy (AFM) has become an indispensable metrology tool for nanoscale surface characterization. Today, research and industry demand faster and more accurate metrology and these demands must be met expediently. Traditional AFM cantilevers and associated actuators (i.e. …
-
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, …
-
Dynamic Atomic Force Microscopy and applications in biomolecular imaging
The Atomic Force Microscope (AFM) is a key member of the Scanning Probe Microscope (SPM) family. Its versatility allows it to image and manipulate nanoscale features with high precision, making it one of the main instruments in nanotechnology for surface characterization. The aim of this thesis is …
-
Investigation of protein-protein interaction using atomic force microscopy
… </p> <p>In our laboratories, we use the force spectroscopy (FS) technique to study protein binding and dissociation. FS measures the strength of the protein molecules bond with high resolution down to pico-Newton either on the surface of solid substrate or the membrane of living cells. …
-
Atomic Force Microscope Conductivity Measurements of Single Ferritin Molecules
<p>Conductive Atomic Force Microscope (c-AFM) was used to measure the conductivity of single horse spleen ferritin (HoSF) and azotobacter vinelandii bacterial ferritin (AvBF) molecules deposited on flat gold surfaces. A 500 micron diameter gold ball was also used as a contact probe to measure the …
-
Atomic force microscopy methods to study protein phase transitions
… associated with protein phase changes via atomic force microscopy, infrared spectroscopy, and other biophysical techniques. AFM is a powerful surface-based technique which can provide nanometre-resolved morphological and mechanical information on protein aggregates. As such, it is capable …
-
The study of organic crystals by atomic force microscopy
… surface and its immediate environment. While atomic force microscopy (AFM) is a useful tool for studying surfaces, it is not a common technique for studying organic crystals. The rst part of this report aims to address problems of imaging organic crystals by AFM which arise from the nature of …
Page 1 of 49