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 24 for “"microswimmers"”.
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Elongated microswimmers: influence of hydrodynamics
… and others. In collective motion, these microswimmers exhibit a diverse behavior such as the formation of swarms, vortices, convection rolls and plumes, and active turbulence. Therby, most microswimmers are elongated, and are otherwise characterized by different swimming mechanisms. …
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Simulations and Control of Artificial Microswimmers in Blood
Artificial microswimmers are micron-sized devices that can propel in viscous fluids. Their potential applications are numerous, including targeted drug delivery, imaging, microsurgery, micro-sensing, assisted fertilization and micro-manipulation. To achieve these tasks, artificial microswimmers …
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Confinement-mediated accumulation and collective dynamics of microswimmers
… of geometry on the dynamics of confined microswimmers. We show that the presence of solid boundaries can encourage local accumulation, clustering, and even large-scale collective flows including at moderate concentrations. Following experimental work (either done by us or our …
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Propulsion, navigation and control of biological and artificial microswimmers
… involving the locomotion of different types of microswimmers, including both biological microorganisms and artificial colloids. Due to the physical constraints imposed by the inertialess hydrodynamics at these small scales, these swimmers rely on multiple locomotion strategies that are …
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Analysis and Modeling of Magnetized Microswimmers: Effects of Geometry and Magnetic Properties
… much attention among researchers is magnetic microswimmers--artificial microrobots that propel in fluid environments by being actuated using rotating external magnetic fields. This dissertation highlights our contribution to this class of microrobots. We address issues regarding fabrication …
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Biophysics of Helices: Devices, Bacteria and Viruses
… in the microscopic world of artificial microswimmers, bacteria and viruses is that of a helix. The intriguingly different physics at play at the small scale level make it necessary for bacteria to employ swimming strategies different from our everyday experience, such as the rotation of …
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Hydrodynamics of swimming microorganisms in complex fluids
… for the locomotion of artificial nano- and microswimmers. In this study, we use several different computational models to investigate the behavior of microswimmers.</p> <p>Microorganisms typically swim in the low Reynolds number regime, where inertia is negligible. They interact with each …
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Active filaments and hydrodynamic interactions in microscale propulsion
… and (ii) hydrodynamic interactions between model microswimmers and their environment, namely with external flows and rigid surfaces. Active filaments. Active, slender filaments are ubiquitous in the micro-scale world, both as a part of the propulsive mechanism of microswimmers or as a flow …
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Motility of Swimming Bacteria Hydrodynamics and Statistics
… applying it to the dynamics of bacteria-driven microswimmers, which are active particles that use bacteria as a propulsion mechanism. We show in particular, that the diffusivity of such particles increases with the square of their size and that the microswimmers inherit the chemotactic …
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Modeling the Motion of Solid Objects Immersed in Viscoelastic Fluids
… micro-scale objects (often referred to as ``microswimmers'') through biofluids and other viscoelastic media. Additionally, a better understanding of such flows offers the potential to improve the ways in which microrheology measurements are made and interpreted. This thesis aims to develop a …
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Novel methods for microfluidic mixing and control
… We use the bulk and ciliary motion of the microswimmers to generate shear flows, thus enhancing cross-stream mixing by supplementing diffusion. The device is similar to an active mixer but requires no external power sources or artificial actuators. The second technique examines a …
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Activation processes in biology
… the surface. Finally, I consider the problem of microswimmers in an obstacle lattice, calculating their transport properties, and showing how we can use lattices to examine the underlying stochastic dynamics.
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Stokes flows near boundaries: bacteria, corners, and pumps
… applications to bacterial micropumps, steering microswimmers near corners, and preventing biofilm formation.
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Artificial Micro-Devices: Armoured Microbubbles and a Magnetically Driven Cilium
… (AMBs) which can self-propel as artificial microswimmers or facilitate microfluidic mixing in a channel when held stationary on a wall. Secondly, we study an artificial cilium, which due to its unique design, when placed in an array, easily produces a metachronal wave for fluid …
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Microscale actuators from carbon nanotube and hydrogel composites
… and modifying the hydrogel synthesis procedure. Microswimmers made from CNT/PNIPAM hydrogel composites are investigated as a case study for applying this microactuator system. The successful implementation of microswimmers requires overcoming a fundamental challenge: the ‘scallop' problem, which …
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Forming magnetic chain with the help of biological organisms
… are relatively slow when compared to those of microswimmers previously published. However, only the largest phage-magnetite assemblies could be imaged and it is therefore still unclear how fast these structures can be in their smaller version.
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Active cellular flows: biological networks, cytoplasmic streaming and swimming bacteria
Fluid flows play fundamental roles in biology, governing processes such as locomotion and transport. At the intraorganellar and intracellular scale, flows enable effective transport and mixing in systems where diffusion is insufficient to sustain the cell's metabolic and developmental needs. Fluid …
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Dynamic and structural basis of complex behaviour in a ciliated unicellular organism
The complexity in the behaviour of life’s smallest organisms is typically overlooked. Despite their small size and relative simplicity, eukaryotic microorganisms routinely perform remarkably sophisticated actions, from directional sensing and tactic navigation to prey capture, feeding, and even …
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