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Showing 1 to 17 of 17 for “"anisotropic particles"”.
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Self-organization in systems of anisotropic particles
… the self-assembly of asymmetric Janus colloidal particles. We identify and systematically describe the effect of the ratio of hydrophobic to hydrophilic surface area on the nonequilibrium processes and structure formation. In Chapter 3, we examine systems of hard, aspherical particles. We …
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Dynamics Of Orientable Particulate Suspensions: Continuum Simulations Of ‘Living’ Fluids And Meso-Scale Simulations Of Anisotropic Particle Suspensions
… such as light; and passive fluids contain anisotropic particles whose size is small enough that non-continuum effect caused by solvent needs to be accounted for. In the first part, instability caused by hydrodynamic interaction between the living cells is probed by Fluid Particle Dynamics …
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Chimie Intégrative dédiée aux morphosynthèses de matériaux composites multi-échelles et étude de leurs applications en photoluminescence, photocatalyse et photovoltaïque
… fiber. This alignment provides to the fiber an anisotropic photoluminescence behavior which can be useful for switching devices application. Finally, we synthesized anisotropic particles and nano-sheets of polypyrrole (conducting polymer) in order to obtain smooth thin films presenting …
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Janus Particles at the Air-Water Interface: Single particle behavior, particle-laden interfaces, and implications for self-assembly
… techniques have allowed for the synthesis of anisotropic Janus particles with precise control of the wetting properties on each hemisphere. Interfacial assembly of Janus particles is of particular interest as the anisotropy and amphiphilicity of these particles can be tuned in order to drive …
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Coffee-Rings and Glasses: Colloids Out of Equilibrium
… phenomena. Specifically, the deposition of particles during evaporation and the glass transition are explored. In the first set of experiments, we found that particle shape has a profound effect on particle deposition. We evaporated drops of colloidal suspensions containing micron-sized …
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Understanding How Tape Casting Titanium Diboride Shifts its Processing-Microstructure-Properties Paradigm Toward New Applications
… explores the synthesis and utilization of novel anisotropic particles to further explore this material relationship. In this work, aqueous tape casting of TiB2 has been investigated. Zeta potential measurements and suspension rheology were used to understand the role of dispersant, binder and …
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Bioinspired scattering materials: light transport in anisotropic, disordered systems
… numerical analysis unveiled that ensembles of anisotropic particles show higher reflectance compared to their isotropic counterpart, whilst using less material. Based on these findings, the optical properties of bioinspired, scattering systems — obtained both via polymer phase separation and a …
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The effects of particle shape, size, and interaction on colloidal glasses and gels
… emulsion polymerization reactions, colloid particles of tunable shape are synthesized from polystyrene. In all, four particle shapes are studied referred to as spheres (S), heteronuclear dicolloids (hDC), symmetric homonuclear dicolloids (sDC), and tricolloids (TC). Two size ranges of …
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Stop-flow lithography for complex particle synthesis and application in directed assembly
The synthesis of complex microparticles is an important objective. These particles can find use in a number of applications ranging from tissue engineering to ceramics and assembly. Tuned assembly of anisotropic particles can give rise to macrostructures with complex morphologies. Externally …
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Capillary Assembly Of Microparticles On Curved Fluid Interfaces
… promise as a tool to orient and assemble microparticles on interfaces between two immiscible fluids. Microparticles trapped at an interface deform the interface around them due to particle geometry, surface roughness, external fields and body forces. When particle deformations overlap, …
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Binary mixtures of rod-like colloids
… occurring in colloidal binary mixtures of rigid anisotropic particles. To this end, we derive a theoretical framework including equilibrium and non-equilibrium methods. The equilibrium description is derived on the basis of microscopic density functionals in the Parsons-Lee and …
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Electrostatically-driven self-assembly of polyelectrolytes and colloidal tetrapods
… addition of positively or negatively charged nanoparticles, demonstrating a concentration-dependent change in the aggregate structure. Chapter 5 presents a new Monte Carlo simulation algorithm that was used to perform the work in Chapter 4. It is an extension of the geometric cluster algorithm …
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Motion of Janus and Patchy Particles Near Various Boundaries
<p>Colloidal particles with anisotropic surface properties are an emergent class of novel materials that have been indicated to possess a remarkable potential to still be fully exploited. Among anisotropic colloids, Janus and patchy particles with different compositions and functionalities recently …
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Synthesis and rheology of pH-responsive particles with shape anisotropy
… is used to produce large quantities of shape anisotropic, amphoteric particles in a size range of about 1 µm. Two different kinds of shape anisotropic particles are prepared for comparison to study the effects of incorporating pH-responsive groups on the properties of suspensions containing …
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Microscale dynamics in suspensions of non-spherical particles
… in suspensions of spherical and non-spherical particles. Two new algorithms were developed to enable studies with accurate hydrodynamics. The first algorithm was a high accuracy Stokesian Dynamics technique (SD) extended to a generic non-spherical particle shape. The many body interactions were …
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Magnetic Manipulation and Assembly of Multi-component Particle Suspensions
… the assembly of magnetic and nonmagnetic particles either in bulk fluid or near a substrate. Both uniform glass interfaces and substrates with magnetic microstructures are considered. The main goal of this work is to discuss new strategies for implementing magnetic assembly systems that …
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Nuclear magnetic resonance studies of complex materials systems: from amplification to anisotropy
This Dissertation was approved for publication on 2016-04-21 at 15:01.