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 16 of 16 for “"colloidal particle"”.
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An investigation of methods for the determination of the colloidal particle size of viscose
… possibly be used to accurately determine the particle size of the viscose sol, with the view of using the best method to follow the colloidal changes in ripening viscose.
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Stability analysis of the 4th order Runge Kutta method in application to colloidal particle interactions
Colloidal particles have a wide range of industrial applications. This study is focused on the application to microstructured materials and the impact of external compressive forces on particles. Currently, in the large throughput manufacturing of microstructured materials, problems such as …
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Post precipitation treatment of copper sulphide particles to improve settleability
In various attempts at producing metal sulphide particles from synthetic solutions, prodigious quantities of nuclei which grow only to colloidal dimensions have been frequently reported. This copious nucleation is promoted by high levels of supersaturation which characterises most precipitation …
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Microfluidic flow of colloidal particles in nematic liquid crystals
… result of research conducted on the behaviour of colloidal particles in nematic liquid crystal flow for a wide range of parameters in microfluidic channels and ducts. We study the change in structure of defects and molecular orientation around a static particle, particle migration in microfluidic …
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A novel integrated platform combining atomic force microscopy and fluorescence correlation spectroscopy
… was the platform was demonstrated by employing a colloidal liquid as a test system. Results of AFM experiments indicated the presence of structure to the colloidal dispersion under confinement, similar to the behavior of molecular liquids reported in the literature, at length scales of a few 10 …
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Direct imaging of self-assembly behaviors of colloids: from the microscale plates to the nanoscale cubes
Microscale and nanoscale colloidal particle self-assembly is widely studied to establish the design rules towards ordered structures and used as atomic model systems for phase transition studies such as crystallization and growth. The well-established synthetic library enables the synthesis of …
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Pilot study of horizontal roughing filtration in northern Ghana as pretreatment for highly turbid dugout water
… to address this issue; to characterize dugout particle sizes and distribution and to test a pilot horizontal roughing filter's (HRF) effectiveness at removing turbidity from highly turbid dugout water. Among the four dugouts tested in NRG, they typically have high concentrations of …
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Isocyanate-derived organic aerogels: polyurethanes, polyureas, polyamides and polyimides
"Aerogels are 3D assemblies of nanoparticles with high open porosity and high surface area, and are pursued for their low density, low thermal conductivity, low dielectric constant and high acoustic attenuation. The foundation for those exceptional properties is their complex hierarchical solid …
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Molecular and active interfaces : controlling the adhesion of low surface tension fluids and solid microparticles
… tension liquids and adhesion of solid microparticles on surfaces. While approaches to repel and control water are studied abundantly in the literature, we focus on low surface tension liquids that readily spread on most substrates, and solid microparticles. Significant attention over the …
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Molecular Dynamics Simulations of A Suspended Particle In A Fluid Near A Wall
The behavior of the suspended particles in a fluid is an important subject in fluid flow studies. Earlier research works mostly were performed using a continuum treatment on a macro scale level. Recent developments in the field of micro- and nanofluids have led to a renewed interest in molecular …
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Characterisation and improvement of the rehydration behaviour of high-protein milk powder
… process of MPI as well. Real-time measurement of particle size was applied to analyse the effect of pH on rehydrating MPI. Sodium carbonate, as an alkali food additive, was firstly studied at rehydrating dairy powder. However, alkalization of MPI followed by neutralization has been thoroughly …
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YIELDING PHENOMENA IN MICROGEL SUSPENSIONS ACROSS LENGTH SCALES
… of network structures, such as fiber gels or colloidal particle gels, or densely packed microgels—microscopic, swollen, cross-linked polymer particles. Understanding the connections among structure, microscopic behaviors, and macroscopic properties is critical for developing advanced and …
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The Surface Charge of Soft and Hard Sphere Colloidal Particles - Experimental Investigation and Comparison to Theory
… of this thesis was aimed at the investigation of colloidal particle stability. In a first step we established a method to assess the repulsive interaction energy of dispersed colloids based on the measurement of the rate of slow coagulation with light scattering. Due to an energy resolution in the …
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Enhanced transport through confined channels by stationary and fluctuating potentials
… system consisting of microfluidic channels and colloidal particles. Holographic optical tweezers are used to modulate the potential energy landscape in those channels. We show how to extract the underlying energy potential by analysing local transition probabilities. Our method is applicable …
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Ordering of Nanoparticles by Wrinkle-Assisted Self-Assembly : Controlling Plasmonic Coupling Effects
… modification, properties and assembly of nanoparticles. Great progress has been attained in the preparation of nanoparticles of any desired size, shape and composition. Metal nanoparticles are particularly attractive due to their spectacular size and shape dependent optical and electronic …