Non-linear dynamics, fluid-structure interactions, and vibrations of microcantilevers in air and liquids
Abstract
Micro- and nano-scale technologies are enabling scientists to visualize, sense, and measure the world at scales not possible just a few decades ago. In particular, the atomic force microscope (AFM) uses microscale cantilevers for imaging and force sensing down to molecular or even atomic resolution. A distinguishing feature of AFM is its ability to operate in liquid environments. This makes it a key instrument in microbiology and biophysics because of its ability to measure biological samples in their native environment - aqueous solutions. Further, it can be used to study solid-liquid interfaces at nanometer resolution and make electrochemical measurements in situ. Yet, operation of AFM in liquid environments is significantly more complicated than operation in air or vacuum. The dynamics of the microcantilever probe are strongly affected by non-linear surface forces and hydrodynamic loading. Herein, we examine several topics related to fluid-structure interactions and non-linear dynamics of AFM cantilevers in liquids. These results will allow researchers to better interpret experimental data, and design hardware that is suited to exploit the unique dynamics in liquid environments.
Degree
Ph.D.
Advisors
Raman, Purdue University.
Subject Area
Mechanical engineering|Nanotechnology
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