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Modeling peak interaction forces of soft matter with dynamic AFM in liquid

AuthorsVargas Guzmán, Horacio Andrés
AdvisorGarcía, Ricardo (CSIC supervisor); Pérez, Rubén (UAM)
Keywordspeak force
dynamic AFM
numerical methods
soft matter
multivariate regression
permanent contact regime
contact mechanics
bimodal AFM
high resolution
tapping mode
scientific computing
scaling law
Issue Date23-Oct-2014
AbstractThe atomic force microscope (AFM) is an instrument that has revolutionized the field of nanoscience and nanotechnology by enabling the characterization and manipulation of materials with nanometer (one billionth of a meter), molecular and atomic resolution. In the last 28 years a variety of experimental AFM techniques have been developed that go from contact to dynamic AFM modes or from working in air to liquid environments. A relevant research avenue within dynamic AFM modes is devoted to the generation of atomic and molecular resolution images of soft materials in liquid environments. Whereby different applications are envisioned into areas of medicine (nanomedicine) and advanced materials. The research presented here focus on two dynamic AFM methods: amplitude modulation AFM (AM-AFM) and Bimodal AM. This thesis describes the study of the peak interaction forces of soft materials under low-Q environments imaged with AM-AFM and Bimodal AM. The maximum interaction forces have been chosen because it rapidly enables tracking into the degree of invasiveness on the sample, its deformation and hence its resolution while imaging. This thesis proposes a theoretical modeling framework that can be divided in two closely related parts. The first part aims to refine the tip-sample interaction modeling for the description of elastic and viscoelastic phenomena of soft materials. The second part aims to obtain high-resolution imaging conditions from the numerical simulations of the dynamics of the cantilever-tip motion in liquid for an extensive range of dynamic AFM operational parameters and materials.
Esta tesis doctoral aborda la descripción teórica de diversos modos dinámicos de la microscopia de fuerzas como son Amplitude Modulation AFM y Bimodal AM en líquidos. Uno de los objetivos es estimar la fuerza máxima ejercida sobre materiales blandos como polímeros o sistemas biológicos. La fuerza pico o máxima permite determinar el grado de invasividad de la técnica sobre una muestra, su deformación y por tanto la resolución espacial. El esquema de modelización se divide en dos partes. La primera parte tiene como objetivo la introducción de nuevos modelos de interacción entre la punta y la muestra para así describir fenómenos elásticos y viscoelásticos. La segunda parte se dedica a desarrollar las condiciones de trabajo del microscopio para obtener imágenes con alta resolución. Para ello se efectúan diversas simulaciones numéricas de la dinámica del sistema micropalanca-punta para una extensa variedad de parámetros operacionales y propiedades mecánicas de materiales.
Descriptiontotal of 149 pages, Chapters 1 to 6 make a total of 128 pages.
Appears in Collections:(ICMM) Tesis
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