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 23 for “"Colloidal nanoparticles"”.
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Phase-equilibrium-mediated assembly of colloidal nanoparticles
Colloidal dispersion of nanoparticles (CNPs) has interesting properties both in terms of fundamental studies and industrials applications. Particular focus on the phase equilibrium and separation dynamics of CNPs has been necessary for understanding how exactly and fast CNPs are assembled and for …
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Modeling the Nucleation and Growth of Colloidal Nanoparticles
Controlling the size and size distribution of colloidal nanoparticles have gained extraordinary attention as their physical and chemical properties are strongly affected by size. Ligands are widely used to control the size and size distribution of nanoparticles; however, their exact roles in …
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Controlling structure across length scales with directed assembly of colloidal nanoparticles
… for producing these designer materials from nanoparticles that arrange themselves into precise symmetries through mechanisms analogous to atomic crystallization. However, DNA-directed colloids and other self-assembled nanoparticle systems still struggle to realize the goal of arbitrary …
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Nanoscale self-assembly and nonequilibrium transformation of colloidal nanoparticles visualized by liquid-phase TEM
… at the nanoscale. We used a model system of nanoparticles to study their crystallization pathways into well-shaped supracrystals. We first quantitatively studied the electron induced beam effect in aqueous environment and developed a protocol to control the self-assembly dynamics of …
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Processes for Forming Plasmonic Waveguides from Self-Assembled Gold Nanoparticle Thin Films
… more cheaply if means could be found to arrange colloidal nanoparticles on suitable substrates. In this project, nanoscale self-assembly has been investigated with the aim of achieving such ends. Colloidal nanoparticles have been synthesized and self-assembled onto substrates such that they show …
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Functional nanomaterials via colloidal assisted fabrication
Spherical colloidal nanoparticles have been popular building blocks for larger scale super structures due to their easy synthesis, unique while simple shape and relatively well understood interactions. Despite concentrated and lasting efforts in the scientific community to explore design phases of …
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Controlling the Morphology and Optical Properties of Nanostructured Materials: From Inorganic Nanoparticles to Conjugated Polymers
Soft materials such as nanoparticles and polymers show properties that are highly dependent on the nanoscale morphology as well as compositions. Thus, the ability to control their nanoscale morphology is important for both fundamental understanding and technological applications of nanomaterials. …
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The applications for 3d inverse opal microstructures
… opal micro structures made using spherical colloidal nanoparticles as building blocks. Because the interactions between colloidal particles are well understood and they are easy to synthesize, they have been widely used to grow these 3-D periodic structures. This inverse opal micro structure …
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Templated self-assembly of sub-10 nm quantum dots
… templates can guide the self-assembly of nanoparticles into ordered arrays. Our motivation in pursuing templated self-assembly is to develop a robust method for the creation of ordered structures at length scales below ten nanometers. The basic process entails creating surface relief …
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Surface Modifications of Iron Oxide Nanoparticles for Magnetic Imaging and Diagnosis
… This work explores and discusses potential of colloidal iron oxide nanoparticles as non-toxic MRI contrast agents for diagnosis. Novel single-nanometer iron oxide (SNIO) nanoparticles exhibited contrast enhancement in T1-weighted MRI superior than commercially used gadolinium-based contrast …
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Isolation of Cellulose Nanocrystals: Data-Driven Identification of Key Factors Affecting Yield and Morphology
Cellulose nanocrystals (CNCs) are rod-like colloidal nanoparticles derived from natural cellulose sources. Among the various methods developed for their isolation, the treatment of cellulose fibres with sulfuric acid remains the most widely used. Although conceptually simple, this process involves …
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The ultra-selective hydrogenation of Furfural on PtCu supported bimetallic nanoparticles and on Pt(111) under ultra-high vacuum
… molecules. Liquid phase experimentation on Pt nanoparticles, dispersed on a wide range of oxide supports, show that Pt is a very active hydrogenation catalyst even at very mild temperature and pressure conditions. The reaction was found to be highly dependent on the solvent used, while catalyst …
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Exploring the mechanism of interfacial self-assembly of colloidal quantum dot nanoparticles
Colloidal nanoparticles at the interface of two immiscible fluids experience certain restrictions on their position and orientation. This property is exploited to create long-range, coherent assemblies of quasi-2D super-structures that are known to possess strong correlations between their packing …
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Synthesis, characterization and catalytic investigations of Pt-based binary (bimetallic) and ternary (trimetallic) nanoparticles
This work tests the hypothesis that nanoparticles of 75 at.% platinum (Pt) composition and anisotropic morphology, will outperform standard catalysts in (PEMFC) hydrogen fuel cells. A survey of the scientific literature on this topic is first presented. The synthetic strategies which were developed …
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Experimental (spectroscopic) and theoretical studies of rhodanine (2-Thio-4-Oxothiazolidine) and its derivatives
… behaviour with citrate-reduced Ag and Au colloidal (substrate) nanoparticles, as well as for semi-quantitative trace analysis. The pH studies revealed that the optimum conditions for SERS analysis is the presence of HC1 and poly(L-lysine) at pH 2.3 (?o = 632.8 nm). The SERS studies also …
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Connecting Thermodynamics and Kinetics of Ligand Controlled Colloidal Pd Nanoparticle Synthesis
Colloidal nanoparticles are widely used for industrial and scientific purposes in many fields, including catalysis, biosensing, drug delivery, and electrochemistry. It has been reported that most of the functional properties and performance of the nanoparticles are highly dependent on the particle …
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Shape-Engineering Substrate-Based Plasmonic Nanomaterials
… This massive effort has resulted in a maturing colloidal chemistry containing an extensive collection of morphologies with compositions nearly spanning the entire transition of the periodic table. While colloidal nanoparticles have opened the door to promising applications in fields such as …
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A Study on Supported Metal Catalysts Prepared from Colloidal Precursors
When metal nanoparticles are supported on the surface of an inert carrier, the resulting materials can become powerful heterogeneous catalysts capable of accelerating a diverse range of chemical reactions. Though there are a wide variety of synthetic routes by which these materials can be prepared, …
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Properties modification of nanopatterned surfaces functionalized with photo activated ligands
… on four research topics: self-assembly of colloidal nanoparticles, surface modifications of the properties of ionically self-assembled multilayer films, surface enhanced Raman spectroscopy of functionalized gold nanoparticles, and two photon uncaging in gel. Those techniques are used for …
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STRUCTURE, DYNAMICS AND RHEOLOGY OF SURFACTANT MICELLES AND MICELLE-NANOPARTICLE SOLUTIONS: A MOLECULAR DYNAMICS STUDY
… been generated in studying the effect of adding colloidal particles to WLMs. Colloidal particles can not only add functionality to the fluid but also act as viscosity modifiers. Such solutions can be used to design active nanomaterials for applications in energy harvesting and sensing. While …
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