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 “"Light scattering measurements"”.
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Inversion of Light Scattering Measurements for Particle Size and Optical Constants
Light scattering techniques have proven to be valuable tools in determining the size and optical properties of aerosol particles. Laser light scattering techniques can be used unobtrusively in harsh environments, so the development and improvement of these techniques is of great interest. The …
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Addressing process variation in aerosol jet printing and accelerating conformal electronics manufacturing
… in a process monitoring technique employing light scattering measurements enabling closed-loop operation and data-rich quality control measures. Light scattering measurements have been shown successful over timescales spanning milliseconds to hours, enabling both closed-loop control and …
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Light Scattering Measurement of Phospholipid Microvesicle Membrane Fusion Kinetics
… density function, as measured by quasi-elastic light scattering and Koppel's method of cumulants, are expressed in terms of moments of the size density function of single-walled hollow spherical scatterers. An equation governing the evolution of fusing particles is derived and solved for simple …
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Effects of Background Ions on Polyethersulfone (Pes) Membrane Fouling by Natural Organic Matter (Nom)
… was experimentally evaluated by dynamic light scattering measurements with SRNOM. These tests showed that calcium caused formation of supramolecular NOM clusters. Large-scale MD simulations with multiple NOM molecules were then performed to probe possible formation of supramolecular NOM …
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Synthesis and characterization of poly-(p-phenylene pyromellitamic acid)
… polyimide in air and in argon. Viscometry and light scattering measurements showed that dimethylformamide is a poor solvent for the polymer. The intrinsic viscosity - weight average molecular weight relationship was found to be [η] = 25.22 x 10⁻⁴ M̄<sub>w</sub>⁰.⁵⁶³ The poly(p-phenylene …
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Dynamics of Membrane Structure Formation in Quenched Polymer Solutions
… agree well with real-time data obtained from light scattering measurements. Predicted pore growth rate curves exhibit a relative maximum with both quench temperature and nonsolvent composition. For shallow quenches (higher quench temperatures and lower nonsolvent content) near a phase …
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Raman scattering in heavy rare earth metals
Inelastic light scattering spectra were measured in MBE grown single crystal films of Dysprosium, Erbium and yttrium. In order to measure the weak Raman signals of metals a single grating monochromator was designed and constructed and added to an existing double grating monochromator to improve the …
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Solution Properties of Polymer Nanostructures Studied by Scattering Techniques
… systems mainly studied by using the scattering techniques at the solution state . The importance of the studying the solution properties of the polymer systems can be related to the solution related applications. In this context the solution properties of the flexible cylindrical …
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Transient electric birefringence of macromolecular systems
… and review of the errors implicit in such measurements is given, with suggested alignment and calibration procedures. For the first time in electro-optic work, a data-logging system and computer program have been developed and employed, and enabled the automatic recording of transient …
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The Dynamics of Phase Separation and Structure Formation in Phase Inversion
… The first two studies employ small angle light scattering to quantify the kinetics of two-phase domain growth that occurs during thermally-induced phase separation of a binary (polymer/poor solvent) system based on a crystallizable polymer and a ternary (polymer/solvent/nonsolvent) system …
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Synthesis and Surface Characterization of Silica-Polypeptide Composite Particles
… with ninhydrin. The use of zeta potential measurements of the P/F silica particles at low pH is presented as a potential alternative for the quantification of surface amino groups. The amino groups on the P/F silica cores were used as initiators for the polymerization of N-carboxyanhydrides …
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Electrical breakdown and structural characterization in synthetic resins using optical techniques
… and tree growth in the pin-plane geometry. Light scattering measurements have been used to determine the origins and magnitudes of the microstructure content (MC) of the Epoxy (CT200) and unsaturated polyester rains, and in conjunction with FTIR spectroscopy, the polyester resin cure …
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STUDY OF COLLOIDAL INTERACTIONS MEDIATED BY BIOMOLECULAR RECOGNITION AND BY ELECTROKINETIC FLOWS.
… by optical techniques: static and dynamic light scattering, electric transmitted light intensity and electric birefringence. The first part of the thesis reports a systematic study of colloidal interactions performed on a dispersion of charged spherical latex particles having two peculiar …
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Novel amphiphilic diblock copolymers by RAFT-polymerization, their self-organization and surfactant properties
… composition, according to dynamic and static light scattering measurements. The micellization is shown to be thermodynamically favored, due to the high incompatibility of the blocks as indicated by thermal analysis of the block copolymers in bulk. The thermodynamic state in solution is found …
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Microrheology and microstructure of poly(vinyl alcohol)-based physical gels
… gels using atomic force microscopy, dynamic light scattering and particle tracking. We compare the microscopic rheological properties with the bulk properties measured using conventional shear rheometry, and correlate the rheological properties to the structure of the materials. We develop a …
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In Situ Characterization of Optical Absorption by Carbonaceous Aerosols: Calibration and Measurement
Light absorption by aerosols has a great impact on climate change. A Photoacoustic spectrometer (PA) coupled with aerosol-based classification techniques represents an in situ method that can quantify the light absorption by aerosols in a real time, yet significant differences have been reported …
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Design and synthesis of mechanoresponsive materials and multivalent polymer-peptide conjugates
… mechanophore. Further, this study highlighted the structure-reactivity relationships which govern naphthopyran mechanochromism. The third chapter of this thesis details the remote generation of light using high-intensity focused ultrasound (HIFU) as a remote force trigger for a …
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Method Development for Transmission Electron Microscopy of Carbon Nanotubes and for Distributed Sensing With Triboluminescent Materials in the Premise of Sustainable Infrastructure
… Raman spectroscopy and time-resolved dynamic light scattering measurements. The water containing functionalized SWNTs and MWNTs were incorporated in the mix design to prepare the cement paste. Compatibility between functionalized nano-reinforcements and the cementitious matrix at the nanoscale …
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Evaluation and Calibration of Coupled Low-Cost Particulate Matter Sensors
… device manufactured by QuantAQ that couples two light-scattering low-cost PM sensors–the Plantower PMS5003 and the Alphasense OPC-N3–to measure both PM2.5 and PMCoarse. QuantAQ purportedly uses the PMS5003 to estimate the mass concentration of particles below the detection limit of the OPC-N3; in …
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