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 “"Charged Nanoparticles"”.
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Controlling Colloidal Stability using Highly Charged Nanoparticles
… focused on the potential use of highly charged nanoparticles to stabilize dispersions of weakly charged microparticles. The experimental components of the project centered on a model colloidal system containing silica microparticles at the isoelectric point where the suspensions are …
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Stabilization of weakly charged microparticles using highly charged nanoparticles
… conducted to evaluate the possible use of highly-charged spherical nanoparticles to stabilize an aqueous dispersion of weakly-charged microspheres. At low pH values, the surface of silica is weakly charged, which leads to flocculation of colloidal suspensions of silica microspheres. Binary …
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Investigating transport of charged nanoparticles by multiphoton fluorescence correlation spectroscopy (MPFCS)
Nanoparticles have been demonstrated as a promising new generation of specific imaging agents and targeted delivery vehicles for the diagnosis and treatment of solid tumors. Nonetheless, for optimal therapy of tumors, the nanoparticles must penetrate the tumor interstitial matrix to reach the …
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Nanoparticle Engineering of Colloidal Suspension Behavior
We investigate the effects of highly charged nanoparticles on 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 …
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Phase Behavior, Structure, and Properties of Colloidal Microsphere-Nanoparticle Mixtures
… and properties of binary mixtures of negligibly charged colloidal microspheres were studied for two size ratios of 95 and 197 at pH = 1.5. In the absence of nanoparticle additions, the system spontaneously assembled into a colloidal gel whose strength increased with microsphere volume fraction. …
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Polymers, Nanoparticles and Phospholipids
In addition, we find binding of charged nanoparticles to the outer surface of phospholipid liposomes produces particle-stabilized liposomes that repel one another and do not fuse. Subsequently, the volume fraction can be raised as high as ∼50%, reversibly, still without fusion. In studies of …
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Plasmon Directed Chemical Reactivity and Nanoparticle Self-Assembly
Nanotechnology has advanced to the point that nanoparticles can now be fabricated in a broad variety of shapes from a wide range of materials, each with their own properties and uses. As the list of manufacturable particles continues to grow, a new frontier presents itself: assembling these …
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Environmental biotransformation of chiral polychlorinated biphenyls and their metabolites
… Other affecting factors, such as presence of nanoparticles and changes in feeding ecology of organisms, also affect the fate of chiral contaminants. In vitro incubations of rat cytochrome P-450 2B1 (CYP2B1) isozyme with chiral PCBs indicated that different biotransformation kinetics and …
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Investigation of electrophoretic deposition as a fabrication technique for high performance composites
… method for the deposition of materials from charged nanoparticles suspended in solution with the application of an external electric field. It is an increasingly popular manufacturing method for engineered materials because of its low cost, simple equipment, flexibility, and efficiency. Yet, …
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Advancements in branched bottlebrush polymers for responsive, targeted imaging
Multi-modality and stimuli responsive nanoparticles are promising platform materials for medical imaging and diagnostics. Specifically magnetic resonance imaging (MRI) and nearinfrared (NIR) fluorescent probes can be used in combination to visualize biodistribution and in vivo clearance rates. We …
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Electrostatically-driven self-assembly of polyelectrolytes and colloidal tetrapods
… research in the aggregation and self-assembly of charged macromolecules. This work aligns along three themes. The first theme is the effective interactions and aggregation of rodlike polyelectrolytes. The second theme is the self-assembly of colloidal tetrapods using Monte Carlo simulation. The …
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POLYELECTROLYTE NANOPARTICLE MEMBRANES AT WATER-WATER INTERFACES
Complexation between oppositely charged nanoparticles (NPs) and polyelectrolytes (PEs) on aqueous two-phase systems (ATPSs) provides a scalable route to assemble functional, stimuli-responsive membranes. The aim of this thesis is to identify the membrane self-assembly mechanism of such systems. We …
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Metal Nanoparticles Deposition On Biological And Physical Scaffolds To Develop A New Class Of Electronic Devices
… issue. Also percolating/conductive array of nanoparticles is not easy to build since repulsion between the charged nanoparticles causes them to deposit at distance significantly larger for electron tunneling. In this study, we resolve these challenges to make nanoparticle based electronic …
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Aerosol Route Synthesis and Applications of Doped Nanostructured Materials
… synthesis system. Both singly- and doubly- charged nanoparticles were measured, with the charged fractions dependent on particle mobility and dopant concentration. A theoretical calculation was conducted to evaluate the relative importance of the two charging mechanisms, diffusion and …
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Studio di formulazione e caratterizzazione di nanoparticelle a base di trimetil chitosano e sodio alginato per il rilascio mirato di farmaci
… purpose of this study was to develop positively charged nanoparticles (NPs) based on trimethyl chitosan (TMC) and sodium alginate (SA) as drug delivery systems able to interact with the sialic residues of the mucous membranes. The TMC has been synthesised in our laboratory slightly modifying …
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Degradable polymeric nano-films and particles as delivery platforms for vaccines and immunotherapeutics
… we also developed biodegradable core-shell nanoparticles with a PBAE core enveloped by a phospholipid bilayer shell for cytosolic delivery, with a view towards delivery of messenger RNA (mRNA)-based vaccines. The pH-responsive PBAE component was chosen to promote endosome disruption, while …
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Investigation of Electrostatic Assembly of Gold Nanoparticles Mediated by Giant Polyoxomolybdate Clusters
… its focus from studying properties of individual nanoparticles toward using these nanoparticles as building blocks to assemble larger systems. One approach to this end is to exploit electrostatic self-assembly through the interaction of oppositely charged nanoparticles to form larger …
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An investigation of the role of mucin gels in disease progression and transmission
… bacteriophage, a model system for viruses, and nanoparticles of comparable size in reconstituted mucin gels simulating the respiratory tract and intestinal environment. Our findings reveal that phage have different transport abilities tied to their geometry, size, and surface chemistry. In …
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Transport of Antibodies and Nanoparticles across An in vitro Blood-Brain Barrier
… antibodies and a variety of drug-loaded nanoparticles (NPs) have been widely used to treat CNS disorders such as brain tumors, Alzheimer's disease and Parkinson's disease. To improve brain delivery efficacy of antibodies and NPs, it is necessary to quantify their transport parameters …
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Crystal engineering, Bio Pharmaceutics and Cell biology of active pharmaceutical ingredient (drug) nanoparticles. Formation and cell interaction of hydrocortisone and prednisolone nanoparticles.
… using cationic surfactants to obtain nanoparticles with different levels of surface positive charge as indicated by ¿-potential values. Dynamic light scattering (DLS) and transmission electron microscope (TEM) techniques were used to characterize the prepared nanoparticles. Powder …
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