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 134 for “"Colloidal Particles"”.
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Continuous dielectrophoretic separation of colloidal particles
… composition remains the same with only the particles being separated. On the microscale, DEP has been used to separate viable and non-viable cells, and cells with different dielectric properties, with the aid of a range of miniaturised, microfabricated devices. However, DEP at the nano-scale …
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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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Dynamic Self-Assembly of Magnetic Colloidal Particles
… in this thesis explores new dynamic regimes of colloidal dynamics which occur when suddenly switching to high Mason numbers. In a static magnetic field the equilibrium structure of paramagnetic colloids are chains. At high Mason number in a rotating magnetic field the time averaged equilibrium …
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The adsorption of colloidal particles by coal
… obtaining relative external surface area of coal particles of the sizes tested.
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Programmable, isothermal disassembly of DNA-linked colloidal particles
Colloidal particles serve as useful building blocks for materials applications ranging from controlled band-gap materials to rationally designed drug delivery systems. Thus, developing approaches to direct the assembly and disassembly of sub-micron sized particles will be paramount to further …
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Electrohydrodynamic interactions of colloidal particles undergoing Quincke rotation
… denotes the spontaneous rotation of dielectric particles immersed in a slightly dielectric liquid when subjected to a high enough DC electric field. Quincke rotation occurs when the charge relaxation time of the particles is greater than that of the fluid medium, causing the particles to become …
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Diffuse double-layer interaction for nonspherical colloidal particles
… used to consider the stability of clay colloid particles. An approach to colloid physics using classical electrostatic methods is presented. Specifically, the electrical double layer is examined using computational methods. To this end, the Poisson-Boltzman equation is solved numerically for …
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Organization of Paramagnetic and Nonmagnetic Colloidal Particles in Ferrofluid
… between paramagnetic and nonmagnetic colloidal particles immersed in a magnetic fluid under the influence of an external time dependent magnetic field. These interactions play an important role in colloidal self-assembly. As a result, of these interactions different forms of …
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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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Structure and interactions of colloidal particles at fluid interfaces
The structure and stability of colloidal monolayers depends crucially on the effective pair interaction potential between colloidal particles. In the first part of the thesis, we present two novel methods for extracting the pair potential from the two-dimensional radial distribution function of …
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Fabrication, dynamics and self-assembly of anisotropic colloidal particles
"The self-assembly of colloidal particles into larger structures is of interest both scientifically and technologically. The range of possible structures that may be formed by isotropically-interacting spherical particles is narrow, encompassing only a few possibilities. To overcome this …
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Rheology and Microstructure of Concentrated Suspensions of Plate-Shaped Colloidal Particles
The second type of clay particles have a smaller aspect ratio approximately equal to 8. These suspensions demonstrate shear thickening at $\phi \ge$ 0.50 and also have a shear history dependent elastic modulus, G$\sp\prime.$ In the shear thinning region G$\sp\prime$ decreases with increasing shear …
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Chemistry directed assembly of multilayered polymer thin films and colloidal particles
… and meso-scale systems, including dye molecules, colloidal particles, proteins and cells. An approach of "surface sorting" was proposed to direct two or more objects with varying functionalities to deposit on predetermined regions of a surface based on specific surface interactions. Specifically, …
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Separation of Colloidal Particles in a Packed Column using Depletion Forces
… of 1.5 and 0.82 µm polystyrene sulfate (PS) particles. Experiments consisted of injecting a pulse of a binary dispersion of PS particles into the inlet of a packed bed of 0.5 mm silica collector beads. Prior to injection, a carrier fluid of either KCl and KOH electrolyte or a silica …
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Coagulation of colloidal particles in turbulent flows with applications in wastewater treatment.
Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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Surfactant Adsorption during Collisions of Colloidal Particles: A Study with Atomic Force Microscopy (AFM)
The adsorption of cationic and zwitterionic surfactants is studied in aqueous electrolyte solutions. A Maxwell relation is applied to Atomic Force Microscopy (AFM) data to obtain changes in surfactant adsorption as a function of the separation between two glass surfaces. In addition, …
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The dual impact of colloidal particles in the environment: emerging contaminants and groundwater remediation agents
L'abstract è presente nell'allegato / the abstract is in the attachment
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