Dokument: Digital Fourier Microscopy and its Application to Soft Matter Systems
| Titel: | Digital Fourier Microscopy and its Application to Soft Matter Systems | |||||||
| URL für Lesezeichen: | https://docserv.uni-duesseldorf.de/servlets/DocumentServlet?id=61763 | |||||||
| URN (NBN): | urn:nbn:de:hbz:061-20230125-133259-3 | |||||||
| Kollektion: | Dissertationen | |||||||
| Sprache: | Englisch | |||||||
| Dokumententyp: | Wissenschaftliche Abschlussarbeiten » Dissertation | |||||||
| Medientyp: | Text | |||||||
| Autor: | Escobedo Sanchez, Manuel [Autor] | |||||||
| Dateien: |
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| Beitragende: | Prof. Dr. Egelhaaf, Stefan U. [Betreuer/Doktorvater] Prof. Dr. Horbach, Jürgen [Gutachter] | |||||||
| Stichwörter: | Colloids, Granular material, Dynamics, Sedimentation, Microrheology, Heterodyne Near Field Light Scattering, Microscopy, Differential Dynamic Microscopy | |||||||
| Dewey Dezimal-Klassifikation: | 500 Naturwissenschaften und Mathematik » 530 Physik | |||||||
| Beschreibung: | Soft matter systems consist of microscopic substances dispersed in a dispersion medium. Usually, the microscopic substance is composed of colloidal particles, with a typical size from a few nanometers to a few micrometers. The particles' motion is mainly governed by thermal agitation. Conversely, when thermal agitation does not play a role in the system's dynamics, the particles (referred to as grains) can only move due to the drag of external forces. Having for both types of systems a wide range of applicability in everyday use. Hence, the importance of experimentally studying microscopic or macroscopic properties. Recently, Digital Fourier Microscopy (DFM) has been introduced. It is a conceptual framework applied to a time series of images to obtain static and dynamic properties of colloidal systems. In this thesis, we present an optimization of the DFM analysis scheme and show various applications. Furthermore, the different optimization algorithms decrease the computational time of analysis.
Also, we present an extension of the theoretical framework by including the effects of moderate multiple scattering, allowing us to define a limit of applicability of the techniques for moderately turbid suspensions. We employ, as well, DFM to extract microrheological properties such as the complex viscosity of various systems, including viscous, visco-elastic, biological, and other complex fluids. In addition, we use DFM to study the contribution of polydispersity to the velocity deviations of sedimenting colloidal systems. Moreover, we extend the physical understanding of the transition between colloidal and granular dynamics by using real and reciprocal space observables. Complementary, we present the polydisperse Langevin model, computer simulations, and experimental results. Furthermore, we study the extension of the DFM framework to X-Ray radiographs, where we extract the dynamics of sedimenting and fluidized granular suspensions. Finally, we introduce the Rheo-DFM framework and use it to characterize the shear profile imposed by a plate-plate shear cell to a colloidal system. | |||||||
| Lizenz: |  Dieses Werk ist lizenziert unter einer Creative Commons Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International Lizenz | |||||||
| Fachbereich / Einrichtung: | Mathematisch- Naturwissenschaftliche Fakultät » WE Physik » Physik der kondensierten Materie | |||||||
| Dokument erstellt am: | 25.01.2023 | |||||||
| Dateien geändert am: | 25.01.2023 | |||||||
| Promotionsantrag am: | 13.05.2022 | |||||||
| Datum der Promotion: | 15.06.2022 |
