Global ETD Search
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Showing 1 to 19 of 19 for “"colloidal gels"”.
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Hydrodynamic Simulations of Colloidal Gels: Microstructure, Dynamics, and Rheology
The microstructure, dynamics, and rheology of colloidal suspensions with short-range depletion attraction and long-range electrostatic repulsion are studied using equilibrium predictions and a new algorithm for dynamic simulations. A focus is made on those combinations of attraction and repulsion …
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Linking Single Particle Dynamics to Macroscopic Phenomena in Colloidal Gels
In this thesis, we investigate the role of colloidal dynamics in governing diverse macroscopic phenomena in colloidal gels. The ability to design materials using predictive tools requires that we understand how the desired properties depend on the various system parameters that govern particle …
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Improved models of colloidal gels : kinetic arrest relaxation dynamics, structural breakdown and the role of hydrodynamic interactions
Colloidal gels, composed of sub-micron, mutually attractive particles that aggregate to form a system spanning network, are the most abundant and diverse soft matter in society with numerous familiar, yet also many exotic applications, ranging from common dairy products to novel medical implants. …
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Novel Rheometric Techniques and Constitutive Models for Linear and Nonlinear Rheology: Applications to Polymeric Solutions and Colloidal Gels
… spectra, and mutating material systems such as colloidal gels that may exhibit age-dependent viscoelastic properties. Similarly, characterizing the rheological properties over the full range of time or frequency scales relevant to their use can be challenging, especially if the material …
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Microscopic characterization of macroscopic colloidal gel rheology
… to a few microns suspended in a liquid, form a colloidal gel. The squishiness of a colloidal gel stems from its elastic space-spanning network of aggregated particles in a viscous liquid, which allows the gel to resist deformations like a solid under low stress, but to flow like a liquid under …
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Multiscale probing of colloidal gelation dynamics
Colloidal gels are viscoelastic materials characterized by the collective behavior of particles that form a space-spanning network. Although the network structure embodies the aggregation process of the particles, the kinetic pathway from a stable suspension to such a complex microstructure remains …
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Taking Magnetic Resonance into Industrial Applications
… insights into the origins and mechanisms of colloidal gel collapse. Many industrial products are colloidal gels, a space-spanning network of attractive particles with a yield stress. Colloidal gels are, however, known to undergo gravitational collapse after a latency period, thus limiting the …
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Colloidal Self-Assembly: Particle Synthesis, Functionalisation and Applications
… explores the self-assembly of hard and soft colloidal particles into mesoscopic structures through modification and control of their surface potentials. Due to its selective binding properties and thermal reversibility, deoxyribonucleic acid (DNA) was used to coat spherical polymeric colloids …
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Programmable Assembly of Elastin-like Polypeptides Within Droplet Microenvironments
… our findings to engineer new thermoresponsive colloidal gels with size tunable across four orders of magnitude (nano-to-meso-to-microscale) that are comprised of elastin-like polypeptides containing unnatural amino acid photocrosslinkers. Lastly, we developed model functional ribonucleoprotein …
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Dynamics and assembly of colloidal particles
… research into the dynamics and assembly of colloidal particles. This involves investigations into single particle dynamics, collective dynamics of assembled clusters, and thermodynamic studies of colloidal superstructure formation. To do this, I have utilized a combination of many simulation …
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Suspension, yielding, microstructure and applications of bacterial cellulose dispersion
… to fluid microstructure design is to create a colloidal gel, a self-supported network that forms spontaneously from attractive particles. Fluid products containing colloidal gels have superior suspension abilities, because they possess a yield stress that makes the fluid elastic until a …
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Nanoparticle Engineering of Colloidal Suspension Behavior
… the phase behavior, structure, and assembly of colloidal microsphere suspensions. Specifically, by selectively tuning the electrostatic interactions between silica microspheres and polystyrene nanoparticles, we study the behavior of four key systems: (i) strongly repulsive, (ii) haloing, (iii) …
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Atomistic simulations of radiation damage in amorphous metal alloys
… similar to gelation processes in polymeric and colloidal gels and suggest new approaches for understanding glass transition in bulk metallic glasses.
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Control of surface structure and properties of responsive hydrogel interfaces via electrostatic interactions
Hydrogels are primary candidates for applications in soft robotics, biomedical devices, and tissue engineering due to their biocompatibility, extremely low coefficients of friction, and potential for a variety of responsive behaviors.[1] Their biphasic nature and viscoelastic network results in a …
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Structure, rheology and applications of thermally-gelling nanoemulsions
Colloidal gelation is an effective tool to engineer material properties. Nanoemulsions, liquid-liquid dispersions where the droplet size is on the order of 100 nm, have become an emerging model system for studying aspects of colloidal gel materials. In conventional approaches, the gelation of …
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Binary diamondoid molecular gels
We demonstrate the formation of gels composed of saturated carbon cage, diamondoid molecules that are rendered attractive through acid-base, non-covalent interactions (hydrogen bonding either with or without proton transfer). The gels are formed by mixing dimethyl sulfoxide (DMSO) solutions of …
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Time-resolved linear and non-linear rheology of thixotropic and aging complex fluids: Application to particulate and biopolymeric physical gels
… ubiquitously observed in materials such as hydrogels, food products and drilling fluids. These materials are in general known as mutating materials and the build-up or breakdown of microstructure is commonly both time– and shear-rate (or shear-stress)–dependent resulting in a range of complex …