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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 264 for “"dynamic light"”.
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Study of Semiconducting Nanomaterials: Photoelectrochemistry and Dynamic Light Scattering
… behavior has been described with respect to dynamic light scattering (DLS) measurements. In our system, we studied electron transfer across the semiconductor (SC) electrode and electrolyte interface. The application of ZnO and TiO2 nanomaterials in dye-sensitized solar cells is the motivation …
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Characterizing Nanoparticle Size by Dynamic Light Scattering Technique (DLS)
<p>The Dynamic Light Scattering Technique was used to determine the size, shape and diffusion coefficient of nanoparticle. The intensity auto correlation functions of light scattered by particles in a solution were measured by using a photomultiplier tube and analyzed to get the relaxation rates …
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A study of polyelectrolyte complexes with dynamic light scattering
Polyelectrolyte complexes (PEC) are a novel class of copolymers formed from the reaction between polyanions and polycations (PE's) in polar solvents.
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Aggregation Behavior of Keratin Proteins Determined by Dynamic Light Scattering
… To have a better understanding of this effect, dynamic light scattering was used to test the size ranges and volume percentages in each range. Dynamic light scattering shows the size of the keratin in each environment and its consistency with time. The results showed that there is a difference …
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Dynamic light scattering studies of phase transitions in polymers and gels
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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Stomatal acclimation to dynamic light: implications for photosynthesis and water use efficiency
… at global scales. Plant acclimation to growth light environment has been studied extensively; however, the majority of these studies have focused on constant light intensity and photo-acclimation, with few studies exploring the impact of dynamic growth light on stomatal acclimation and …
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Dynamic Light Scattering in Alkali Borate Glass Melts Near the Glass Transition
… borate glasses are strongly influenced by their dynamics, which are difficult 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 …
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A comparative analysis of C3 and C4 photosynthesis under dynamic light conditions
… effort. The response of plants to changes in light intensity has been identified as a source of inefficiency for photosynthesis, as in the dynamic environments of the open field, where crop canopies are subject to constantly changing light intensity, lags in photosynthetic responses can amount …
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Dynamic Light Scattering Study of Structural Effects on the Dynamics of Potassium Borate Glass
Liquids cooled at a sufficiently fast rate can become supercooled and later solidify in a process known as vitrification, or the glass transition. It is commonly believed that intermolecular bonds are responsible for the vitrification of glass-forming liquids. In Particular, oxide glass-formers …
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N-Vinylcaprolactam based Bulk and Microgels: Synthesis, Structural Formation and Characterization by Dynamic Light Scattering
The light scattering methods were used for characterization of properties and formation of networks of different dimension, based on N-vinylcaprolactam (VCL). Formation of PVCL microgels in presence of poly(vinyl alcohol) as stabilizer was studied. Size of resulting microgels strongly depends on …
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On the Structure and Dynamics of Aluminophosphate Glass-forming Melts measured by Dynamic Light Scattering
I report the results of a series of dynamic light scattering studies of molten aluminophosphate 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 …
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From the Boiling Point to the Glass Transition: Reorientational Dynamics as Revealed by Dynamic Light Scattering
Im Laufe dieser Arbeit wurde mit Hilfe der depolarisierten dynamischen Lichtstreuung (DLS) die Rotationsdynamik von molekularen und ionischen Flüssigkeiten im Temperaturintervall zwischen der Glasübergangstemperatur und dem Siedepunkt gemessen. Es werden depolarisierte Lichtstreuspektren von …
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Measurement of the first internal mode of polystyrene in cyclohexane and toluene through dynamic light scattering
… 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 program (NLLSQ) on an Apple IIe computer. The …
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Dynamic Light Scattering for the Characterization of Polydisperse Fractal Systems by the Example of Pyrogenic Silica
Dynamic light scattering (DLS) is a method to size submicron particles by measuring their thermal motion (diffusion) in suspensions and emulsions. However, the validity of the Stokes-Einstein equation that relates the diffusion coefficient and the particle size is limited to spherical particles and …
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Evaluation of dynamic light scattering as a technique for the routine monitoring of therapeutic proteins on stability
… developed and can be used where appropriate. Dynamic Light Scattering (DLS) is one such technique, that has been described on several occasions as an early indicator of protein aggregation. Some benefits of DLS over other aggregation-monitoring techniques, is its ability to analyse proteins in …
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Dynamic light scattering and diffusing wave spectroscopy studies of the microscopic dynamics of polystyrene latex spheres suspened in glycerol
The dynamics of polystyrene latex spheres [650 A radius] suspended in glycerol have been studied using the techniques of dynamic light scattering in the single scattering limit and diffusing wave spectroscopy in the multiple scattering regime using a charge coupled device [CCD] camera as our …
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A study of long time behavior of aqueous solution of polyethylene oxide (Peo) and aqueous salt (potassium sulfate) solution of Peo using dynamic light scattering
… solutions of PEO by using the dynamic light scattering technique; The long time study measurement results indicated that the values of the polydispersity factor and the mutual diffusion coefficient of the PEO particles of the solutions changed very slowly. The analysis of the …
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Mechanistic approaches towards understanding particle formation in biopharmaceutical formations. The role of sufactant type and level on protein conformational stability, as assessed by calorimetry, and on protein size stability as assessed by dynamic light scattering, micro flow imaging and HIAC
… and on protein size stability as assessed by Dynamic Light Scattering (DLS), HIAC and MFI. BSA and IgG2 were used as model proteins. Thermal unfolding experiments indicated a very weak surfactant-immunoglobulin IgG2 interaction, compared to much stronger interactions for the BSA surfactant …
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Solution Properties of Polymer Nanostructures Studied by Scattering Techniques
… angle neutron scattering (SANS) and small angle light scattering (SLS). The change in dynamics of the cylindrical polymer brushes at the dilute and semi-dilute concentration regimes was studied by using the dynamic light scattering. The thermodynamic transition and kinetics of the cylindrical …
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