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Showing 1 to 20 of 27 for “"particle aggregation"”.
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Applying Classical Particle Aggregation Modeling Techniques to Investigate the Heteroaggregation of Environmental Biocolloids
… predicting the fate and transport of biological particles. For over 100 years, Smoluchowski’s watershed 1917 work has provided a foundation for the construction of such models. Classically, this approach has been used for inert nano-scale particles. However, given that several of the most …
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Designing Particle Tracking Software for a Theoretical Understanding of Magnetic Janus Particle Aggregation
<p>Magnetic Janus particles are spherical colloids covered with a thin magnetic cap on one half of their surface. The asymmetric magnetic material gives the particles a magnetic dipole shifted away from the center of mass of the particle. The magnetic dipole either points perpendicular …
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Nucleation Control in Size and Dispersity in Metallic Nanoparticles: The Prominent Role of Particle Aggregation
… on the final size and dispersity in metallic nanoparticle systems. Aggregative nucleation functions are determined for the first time for three nanocrystal systems, namely gold: Au), silver: Ag) and bismuth: Bi). These nucleation functions give critical information that correlates closely with the …
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Kinetics of Crystallization and Gelation in Colloidal Suspensions
… arising from three underlying processes at the particle level, viz., aggregation, dissociation, and rearrangement. Particles aggregate via Brownian encounters into clusters that have open structures. Subsequently, these particles rearrange into crystalline configurations to minimize their free …
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Non-equilibrium self-assembly processes of complex dipolar colloids
… underlying mechanisms of structure formation and particle aggregation. The experimental systems motivating this work correspond to two prototype non-equilibrium processes, which are lane formation and diffusion limited aggregation. In the case of lane formation it is Janus particles in AC electric …
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Electric charge within volcanic plumes on Earth and Io
… detecting even very small quantities of volcanic particles, and tracking a continuously produced (over a period of several hours), dilute plume as it was dispersed by the wind. Data collected during one small Vulcanian eruption suggest that charges, about 1 C in magnitude, were generated and then …
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Particle microstructure and polymer dynamics in concentrated polymer solutions
The states of nanoparticle dispersions in concentrated polymer solutions are studied with extensive small angle scattering and NMR experiments. Silica nanoparticles are suspended in polymer-solvent mixtures. The effects of polymer induced interactions on the particle microstructure are examined …
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Caracterização estrutural, dinâmica e reológica de suspensões coloidais via simulação molecular
… are formed. It is necessary studiyng the particle aggregation dynamics to understanding the dynamic mechanisms of paraffins and asphaltenes precipitation. The goal of this work was the implementation of algorithms that calculate structural (Radial Distribution function (RDF) and Structure …
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Toxicity and drug delivery ability of bio-inspired silica nanoparticles
Silica nanoparticles are already being used for a number of diagnostic and therapeutic applications. This work focused on the use of bio-inspired silica as a potential drug delivery agent and the toxic effect produced due to their small size. Using two bio-inspired drug encapsulation methods and a …
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Effect of silver nanoparticles on planktonic and biofilm cell growth
Silver nanoparticles (Ag NPs) are one of the most widely used nanoparticles, most notably serving as an antimicrobial agent for sanitization and medical purposes. Despite of their widespread use, little was known about the environmental effect of silver nanoparticles. This research focused on the …
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Optical properties of concentrated dispersions
… has been investigated for non-spherical particles in concentrated dispersions, over a range of pH and surfactant concentrations. Measurements of diffuse transmittance and reflectance required large corrections to be made £->r the presence of any specular interfaces i.e. windows. These …
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Directional Dependence and Polarization Anisotropy in Pump-probe Microscopy
… signals using model samples (e.g., gold nanoparticles, natural and synthesized melanin particles, historic artwork pigments) and an upgraded pump-probe microscope. The experiments improve understanding in pump-probe signals and help for better data analysis.Chapter 2 demonstrates my …
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Metal Oxide Nanoparticles: Optical Properties and Interaction with Chemical Warfare Agent Simulants
… condensation synthesis of metal oxide nanoparticles was used to develop materials to explore the optical and chemical properties of metal oxide nanoparticles. One potential application for nanomaterials is use in optical applications. The possibility of interparticle energy transfer was …
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Physicochemical properties of the anion-modified surfaces of silver nanostructures
… the surface plasmon resonance band assigned to particle aggregation. This was confirmed using two dimensional arrays of particles in which the surface-modifier caused only damping with no change in the plasmon frequency;Addition of cytochrome c to the halide-modified colloid resulted in the …
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Visible Light Photocatalytic MoO3-Based Nanomaterials Synthesis, the Effect of Polymer Coatings on Their Photocatalytic Activity and Dissolution, and Their Applications in Water Treatment
… dissolution was observed in a wide pH range and particle aggregation was elevated in the presence of inorganic and organic compounds, resulting in diminished photocatalytic activity. However, material dissolution was significantly reduced in the presence of inorganic and organic matter, …
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Use of Rheology to Assess Structures in Polymer Nanocomposites
Nano-scale particles due to their outstanding ability to improve physico-mechanical properties of polymeric matrices have been the major research interest in composite science area in recent years. In many cases the so-called improved properties are considered to be linked to the irreversible …
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All-atom and Coarse-grained Molecular Dynamics Modeling of Various Polymeric and Composite Materials
… polymer nanocomposites by mitigating nanofiller aggregation. Experiments show that coating the surface of reduced graphene oxide (rGO) nanoparticles with PEI chains can improve their dispersion in a PEI matrix and thus lead to stronger composites. Simulations reveal that the PEI chains grafted to …
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Numerical Study of Acoustophoretic and Thermophoretic Aggregation of Micro- and Nano-Sized Particles
Precise manipulation of bio-micro/nanoparticles, including cells, platelets, bacteria, and extracellular vesicles, is critical for tumour diagnostics, infectious disease detection, and cell analysis. The acoustofluidic aggregation method shows its significant advantages in microparticle …
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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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Exploring co-milling as a strategy to improve the dissolution of poorly water-soluble drugs
… solid-state and thermal analyses, as well as particle size characterization. The first major finding of this thesis was the development of a predictive model to quantify the dissolution enhancement achievable through co-milling. Using data from 29 crystalline drugs co-milled with PVP K25, key …
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