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 22 for “"Silica nanoparticle"”.
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Molecular pathways of silica nanoparticle formation and biosilicification
Biosilicification and silica nanoparticle formation occur in many modem terrestrial environments and they also played an important role in ancient geological settings. This thesis presents results from (i) field studies in Icelandic geothermal waters that aimed at quantifying the parameters that …
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Lattice Vibration Study Of Silica Nanoparticle In Suspension
… at the solid-liquid interface and clustering of nanoparticles. In this work atomic scale simulation has been used to study possible mechanisms affecting the heat transfer characteristics of nanofluids. Molecular dynamics simulation for a single silica nanoparticle surrounded by water molecules …
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Study of Freeze-Cast Porous Silica Nanoparticle-Based Composites
Porous silica-based nanocomposites are promising ceramics, as they exhibit high specific surface area, highly porous network, and a surface that can be easily functionalized. This dissertation describes the results of a study on the formation and properties of porous silica nanoparticle-based …
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Silica Nanoparticle-Based Platform for Rare Earth Element Recovery and Separation
… materials, such as those incorporating silica nanoparticles (SiO2 NPs), are promising materials to incorporate into REE separations due to their high surface area, tunable surface chemistry and environmental compatibility. Their scale offers several advantages, including high …
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Silica Nanoparticle-based Novel Fluorescent Biosensors with Conjugated Polyelectrolyte-sensitized Signals
… that is focused on the design and fabrication of silica nanoparticle (NP) based fluorescent biosensors with the aid of conjugated polyelectrolytes (CPEs) for the detection of human-essential biomolecule and disease-related proteins. An overview of recent research and development emphasizing on …
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Effects of silica nanoparticle surface treatment and average diameter on the physical and mechanical properties of poly(dimethylsiloxane)-silica nanocomposites
… of this thesis was to quantify the effects of silica nanoparticle surface treatments and average silica nanoparticle diameter on various macroscopic properties of poly(dimethylsiloxane)-silica nanocomposites, specifically stiffness, wettability, and permeability to organic solvents. …
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Improvement of the Optical and Mechanical Properties of Silica Nanoparticle Ionic Self-Assembled Multilayer Anti-Reflection Coatings on Glass and Polycarbonate Substrates
… of the optical and mechanical properties of silica nanoparticle films fabricated by ionic self-assembly, also known as layer-by-layer (LbL) deposition. Utilizing electrostatic attraction of oppositely-charged materials permits uniform and rapid growth of the constituents onto planar and …
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GROWTH OF SILICA-BASED NANOPARTICLES: CONTROLLING STRUCTURE AND FUNCTION
Silica chemistry provides a uniquely tunable platform for nanoparticle synthesis, where particle size, nanoscale morphology, and surface properties can be precisely controlled. Recent advances demonstrate that conveniently accessible parameters, including silica precursor chemistry, solvent, and …
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Highly Transparent, Self-cleaning, and Antireflective Nanoparticle Coatings
… behavior of low index of refraction silica nanoparticle films, with an ultimate goal to develop a method to deposit these films on glass substrates from aqueous solutions. </p> <p>The optical, wetting, and self-cleaning ability of these films was evaluated at a laboratory scale. It …
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Terpyridine Functionalized Dye-Doped Silica Nanoparticles (DDSN) for Detection of Metal Ions
<p>In an effort to synthesize a novel silica nanoparticle platform for the fluorescent sensing of metal ions and future use in QDA, we synthesized from the bottom up a novel 2, 2’: 2’, 6- terpyridine functionalized fluorescein doped silica nanoparticle system capable of the sensitive detection of …
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Construction of an Optical Quarter-Wave Stack Using the ISAM (Ionic Self-Assembled Multilayers) Technique
… of one layer of titania and of one layer of silica nanoparticles. We utilize much that is already known about silica nanoparticle deposition. The first objective of this thesis is deposition and characterization of titania nanoparticle films deposited on glass microscope slides by a technique …
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Molecular dynamics simulation of penetrant transport in composite poly (4-methyl-2-pentyne) and nanoparticles of different types
… composite Poly (4-methyl-2-pentyne) (PMP) and silica nanoparticle is being explored with molecular dynamics (MD) simulations. The structure of the PMP and amorphous silica nanoparticle composite was modeled and with the structure the variation of the cavity size distribution was established due …
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Separation of Colloidal Particles in a Packed Column using Depletion Forces
… 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 nanoparticle dispersion was flowing through the column at steady state. When the carrier fluid was a dispersion of silica nanoparticles, the …
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Dendrimer Modified Silica Nanoparticles as Fluorescent Chemosensors for the Detection of Copper and Cyanide Ions
<p>A series of silica nanoparticle-based fluorescent chemosensors were synthesized for the sensitive and selective detection of Cu<sup>2+ </sup>ions in aqueous solution and subsequent CN<sup>-</sup> ion detection. Silica nanoparticles (SNP) were modified with branching polyamidoamine (PAMAM) …
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Synthesis and characterisation of hollow monodisperse silica-titania nanostructures for potential use in targeted delivery of drugs/vaccines/genes
… growth in pharmaceutical formulations based on nanoparticle technology. Although a large number of nanocarriers have been studied, most of them are limited by their ability to carry sufficiently viable therapeutic loads, toxicity, and target specific delivery etc. There is, therefore, an urgent …
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Investigation of Hydrodynamic and Depletion Interactions in Binary Colloidal Dispersions
… particles. The effects of charged, hard spheres (silica nanoparticle) on the hydrodynamic drag force a particle experiences as it approaches a flat plate were measured experimentally using colloid probe atomic force microscopy (CP-AFM). Deviation was found between the measured drag force and …
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Development of novel bio/nano interfaces for materials science and biomedical applications
… self-assembled hexagonal close-packed arrays and nanoparticles with greatly enhanced surface plasmonic properties. Multivalent peptide display on MS2 VLPs greatly enhances their affinity for target cells (e.g. hepatocellular carcinoma), providing the specificity necessary to deliver various …
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Synthesis of CRUD and its effects on pool and subcooled flow boiling
… using layer-by-layer deposition of 100 nm silica nanoparticles to form porous, hydrophilic thick films. Photolithography was used to manufacture posts that were then dissolved to create characteristic boiling chimneys. Features such as thickness, wettability, pore size, and chimney diameter …
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Novel Rubber Nanocomposites with Adaptable Mechanical Properties
… Instead of carbon black and conventional silica particles, the reinforcing agents used here were polymeric fillers and silica nanoparticles whose effectiveness in reducing the Payne effect were also examined In Chapter 2 a commercial polybutadiene rubber, CB 10, was quantitatively modified …
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