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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 26 for “"photon correlation spectroscopy"”.
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Photon correlation spectroscopy study of slow relaxation in alkali germanate and phosphate germanate glass melts
… polymers. Over the past two decades, a series of photon correlation spectroscopy (PCS) investigations carried out by Dr.Sidebottom and colleagues at Creighton University have worked to fill this data gap by systematically probing the α-relaxation in a variety of alkali-modified network-forming …
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X-ray photon correlation spectroscopy studies of the dynamics of self-assembling block copolymer structures
… presented to the emerging technique of X-ray Photon Correlation Spectroscopy. These improvements enabled the study of polymer structures, in particular isotropic sponge phases of homo-polymer block copolymer mixtures. An analysis is presented on how to optimize the experimental beamline …
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Optical Properties of Colloidal II-VI and III-V Semiconductor Nanocrystals: Single Nanocrystal Photon Correlation Spectroscopy
… using a combination of ensemble and single NC photon correlation spectroscopic techniques. In the first chapter, I introduce the photophysical properties of colloidal NCs and spectroscopic techniques relevant to my studies. In the second chapter, I determine the dominant photoluminescent line …
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An investigation of photon correlation spectroscopy data analysis packages "discrete" and "contin" using the Schulz-Zimm distribution
… are standard data analysis packages used in Photon Correlation Spectroscopy for inversion of noisy autocorrelation functions. Their resolution was studied using simulated autocorrelation data based on the Schulz-Zimm distribution of polymer radii; Autocorrelation functions with various noise …
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The effect of intense x-ray beams on oxide glasses unveiled by means of photon correlation spectroscopy
In this thesis we aim to study the structural evolution under x-ray illumination in a selection of oxide glass formers as a function of the radiation dose. The irradiated specimens are investigated by means of XPCS experiments and also by means of “exsitu” experiments as luminescence, Raman and …
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Measurement of the dependence of the averaged internal mode on the scattering vector and of the first internal mode on the concentration of polystyrene in solution using photon correlation spectroscopy
… in toluene and cyclohexane was done using photon correlation spectroscopy. In the experiments laser light of two different wavelengths was scattered from local concentration fluctuations in the polymer and autocorrelation function was calculated; The autocorrelation function can be written …
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Solubility and speciation of plutonium(VI) with orthophosphate
… phosphate concentrations up to 0.6 M. Absorption spectroscopy, solubility experiments, scanning electron microscopy and photon correlation spectroscopy were utilized.
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Light Scattering Study of Aqueous Sucrose Solutions
… at concentrations ranging from 10 wt% to 50 wt%. Photon correlation spectroscopy was performed on samples at temperatures from −100C to 500C . Light scattering data were obtained from angles of scattering between 18.4<deg> and 90<deg>. The autocorrelation showed two distinct relaxations that were …
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Dynamic Light Scattering in Alkali Borate Glass Melts Near the Glass Transition
… to study using conventional techniques. Photon correlation spectroscopy (PCS) is a powerful tool that allows the study of the dynamics of liquids at the molecular scale. In this thesis, we investigate the dynamics of alkali borate glass melts using PCS, with the aim of understanding how …
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On the Structure and Dynamics of Aluminophosphate Glass-forming Melts measured by Dynamic Light Scattering
… liquids, [Al(PO3)3]x[NaPO3]100-x, obtained by photon correlation spectroscopy. The study covers a range of compositions designed to manipulate the network connectivity of the glass-forming liquid in order to investigate how the change in the chemical structure of covalent network affects its …
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Dynamic Light Scattering Study of Structural Effects on the Dynamics of Potassium Borate Glass
… here the results of a study in which we used photon correlation spectroscopy to determine if the average number of structure-connecting bonds is related to the temperature-dependent viscoelastic properties of potassium borate glass.
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Measurement of the first internal mode of polystyrene in cyclohexane and toluene through dynamic light scattering
… and cyclohexane was done through the use of photon correlation spectroscopy from scattered laser light. The data obtained (autocorrelation functions) were then analyzed by means of a multi-exponential fitting programme (Discrete) on the Cyber 830 computer and by a non-linear least squares …
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X-ray induced temperature dependent amorphous-amorphous transitions in the GeO2 glass
… strong oxide glass, by combining X-ray photon correlation spectroscopy (XPCS), X-ray diffraction (XRD), and inelastic X-ray scattering (IXS). The results demonstrate that intense X-rays induce atomic dynamics and structural transformations in v-GeO2 far below the glass transition …
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Dynamical perspective of stability in glasses
… Analysis of Inelastic X-ray Scattering and Raman spectroscopy, while slow relaxation processes are probed via X-ray Photon Correlation Spectroscopy. Fast nanocalorimetry provides complementary information on the macroscopic stability of compressed samples. The results show that ultra-stable …
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A study of the effects of lithium perchlorate on poly(ethylene oxide), (Peo) melt dynamic behavior using Fabry-Perot interferometry
… techniques, Fabry-Perot interferometry and photon correlation spectroscopy. Our tests and evaluation show that the setup performs very well giving good resolution and numerous advantages to both techniques. We report Brillouin scattering results on PEO-1K melts and PEO-1K/LiClO4 complexes at …
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Spectroscopy and rational chemical design of single emitters for quantum photonics
… heterogeneity, emission linewidths, and singlephoton emission purity of single lead halide perovskite quantum dots (PQDs) in dilute solutions using photon-correlation spectroscopy. I identify PQD's unique minimal inhomogeneous broadening and remarkable tunability of the biexciton Auger …
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Microemulsions formation, stability and their characterisations
… viscometry, electrical conductivity, photon correlation spectroscopy, UV-spectrophotometry, thermogravimetric analysis, transmission electron microscopy, surface and interfacial tension techniques) have been used to characterise and understand the microchemistry of the microemulsion …
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Colloidal microgels as (trans)dermal drug delivery systems
… determined using different techniques including photon correlation spectroscopy (PCS), transmission electron microscopy (TEM), nuclear magnetic resonance (NMR spectroscopy), and turbidimetric analysis (UV-vis). The uptake and release of the model compounds to and from colloidal microgel particles …
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An investigation into polymeric excipient-drug compatibility in solid-liquid formulations
… Stable dispersions were monitored by photon correlation spectroscopy (PCS) for changes in particle size after their preparation and also for up to three months thereafter. Samples remained dispersed at three months. The adsorption characteristics of the stabilising and partially …
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Light scattering: from ensembles to single particles
… with statistical inference can be applied to Photon Correlation Spectroscopy. By viewing the inverse problem of size distribution estimation within the Bayesian framework, a method for extracting an uncertainty quantified (UQ) estimate of the size distribution is presented. The technique is …
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