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 20 for “"hydrodynamic size"”.
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Quantitative Model for the Prediction of Hydrodynamic Size of Nonionic Reverse Micelles
The sizes of nonionic reverse micelles were investigated as a function of the molecular structure of the surfactant, the type of oil, the total concentration of surfactant [NP], the ratio of NP4 to total surfactant (r), the water to surfactant molar ratio (ω), temperature, salt concentration, and …
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Optical instruments for characterization in the nano-scale
… Correlation Spectroscope for determination of hydrodynamic size of quantum dot bioprobes to nanometer precision in part one, and the Long Trace Profiler/Optical Slope Measurement System for characterization of line spacing errors in X-ray blazed synchrotron diffraction gratings to the Angstrom …
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Surface modifications of iron oxide nanoparticles for biological applications
… of high crystallinity, high magnetization, and size-monodispersity were synthesized with oleic acid as their native ligands. These hydrophobic and non-functionalized MPs have magnetic properties that are suitable for various biological applications. Surface modifications were studied for …
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Characterization of nanoparticle-DNA conjugate and control of DNA conformation on particle surface
… Conjugates of DNA with Au NP of different sizes and coverages are evaluated with Ferguson analysis to characterize important parameters such as hydrodynamic size and zeta-potential. Surface modified Au NP exhibits enhanced stability and hybridization specificity in the system, which infers …
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DNA-colloid systems and micro-rheology
… previous works, which simply found an increased hydrodynamic size. Chapter 4 looks at tuning the hydrophobicity of silica particles using poly(L)lysinepolyethylene glycol (PLL-PEG). We find an incubation pH dependence on their coverage. From analysing video microscopy trajectories, PLL-PEG coated …
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Quantum dot-based nanomaterials for biological imaging
Quantum dot-based fluorescent probes were synthesized and applied to biological imaging in two distinct size regimes: (1) 100-1000 nm and (2) < 10 nm in diameter. The larger diameter range was accessed by doping CdSe/ZnS or CdS/ZnS quantum dots (QDs) into shells grown on the surfaces of pre-formed …
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Multifunctional Nanoparticles for Cancer Imaging and Therapy
… stability and biocompatibility as evaluated by hydrodynamic size measurement over time due to the presence of a chitosan-PEG copolymer. The efficiency of gene silencing was evaluated by transfection of anti RFP siRNA in glioma cells. Conjugation of glioma-targeting peptide chlorotoxin on the …
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Capillary electrophoresis of pteridines in urine and plants and quantification of pharmaceutical and personal care products in Missouri waste water
… molecules based on their respective charge and hydrodynamic size. The major advantages of CE are high separation efficiency, small sample volume requirements, simple to no sample preparation and often organic solvents are not required for the separation.</p> <p>The work presented in this …
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Single quantum dot tracking for quantitative molecular imaging
… application is toward accurate measurement of hydrodynamic size of colloids with dimensions smaller than 100 nanometers (nm). We develop a new method using widefield fluorescence microscopy and SPT to measure nanoparticle size and demonstrate accurate single-molecule size measurements of a …
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An investigation of the molecular structure, composition and biophysical properties of gum Arabic
… is in agreement with literature values. The hydrodynamic size of the molecules present in the gums was studied using dynamic light scattering and it was found that molecular association occurred in solution over time which was inhibited in the presence of an electrolyte. The comparison of …
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A next generation theranostic nano-platform for sustained and enhanced inhibition of cancer stem cells
… spectroscopic methods. Carbon nanoparticles (Hydrodynamic dynamic size=55±1 nm) were obtained via the environmentally benign hydrothermal synthetic route using food grade Agave nectar as the carbohydrate source. The particles were either prefunctionalized (hHydrodynamic dynamic size= 76±13 nm) …
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PFG-NMR Untersuchungen zu Skalenverhalten, effektiver Größe und Lösungsverhalten von Dendrimeren
Das Ziel der Arbeit war es, Skalenverhalten und Lösungseigenschaften von flexiblen Dendrimeren als Modell für hochverzweigte Polymere zu untersuchen. Als Untersuchungsmethode wurde die gepulste Feldgradienten NMR (PFG-NMR) eingesetzt, um das hydrodynamische Verhalten der Dendrimere in Lösung zu …
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Engineering nanomaterials for molecular imaging and targeted therapy
… dot surfaces to make a quantum dot with minimal hydrodynamic size, negligible nonspecific interactions, chemical functionality and long stability for imaging cells and tissues. Toward this goal, a new polymer surface coating methodology is developed for making small (7.4-12 nm), stable (over …
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Aerosol Route Synthesis and Applications of Doped Nanostructured Materials
… TiO2 nanomaterial properties: composition, size, and crystal phase) were independently controlled based on nanoparticle formation and growth mechanisms dictated by process control parameters. Copper dopant found to significantly affect TiO2 properties such as particle size, crystal phase, …
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Development of polymer-coated nanoparticle imaging agents for diagnostic applications
… and treatment of cancer before it has metastasized to other organs has resulted in a dramatic improvement in patient survival rates. One area of research that has shown considerable promise in further advancing diagnostics and early cancer detection is nanotechnology. Specifically, …
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The development of targeting nanosystems for the treatment of glioblastoma and neuroblastoma tumours
… analysis for both citrate capped NPs showed a hydrodynamic size of approximately 7 nm, which doubled after surface functionalization with PEG and slightly increased following CTX surface functionalization. The zeta-potential revealed highly stable citrate NPs and decreased to more neutral …
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A new approach to predictive modelling of flow of hydrophobically associating polyacrylamide polymers in porous media.
… was linked to the effective pore radius and the hydrodynamic size of the polymer molecules. Thirdly, a similar structural kinetic theory was employed for the quantitative description of hydrophobic interactions under shear thinning, shear thickening, and shear degradation flow regimes in the …
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Influential cooling of the free surface by jet impingement of aqueous nanodispersion dominant with hybridized nanoparticles
… by TEM and DLS to understand the dispersion and hydrodynamic size. The fluid stability was evaluated and quantified by visual inspection, zeta potential and transient viscosity approach. The nanofluid properties such as viscosity, thermal conductivity and surface tension were measured at …
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Single Molecule Study of Polymer-Surfactant Interactions
… value obtained from ‘classical methods’. The hydrodynamic radius of SDS micelle around CMC is found to be ~ 2.0 nm. The shape of the autocorrelation curves and number of dye particles in the focal volume also supports to follow the SDS micelle. When varying the concentration of MC, slight …
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Advancing thermal field-flow fractionation for industrial polymer characterization
… solely on D which subsequently relates to hydrodynamic size. For thermal FFF (ThFFF), the retention parameter is dependent on the Soret coefficient (ST), a ratio of the thermal diffusion coefficient (DT) and D. Existing studies of the thermophoresis of polymers in dilute solutions have …