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 49 for “"dielectric spectroscopy"”.
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Time domain metrology for dielectric spectroscopy of particulates
… holders to determine a method of obtaining dielectric information from in-situ time domain measurements. A scheme using a twin lead balun driven ground probe was proposed and analysed with regard to accuracy and sensitivity to measurement error.
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Probing Collective Motions and Hydration Dynamics of Biomolecules by a Wide Range Dielectric Spectroscopy
… a highly sensitive megahertz-to-terahertz dielectric spectroscopy system to probe the hydration shells as well as large-scale dynamics of these biomolecules. Thereby, we have deduced the conformation flexibility of proteins and compare the hydration dynamics around proteins to understand …
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Primary and Secondary Relaxations in Neat and Binary Glass Formers Studied by Means of Dielectric Spectroscopy
… molecular glass formers studied with the help of dielectric spectroscopy (DS). One of two main interests followed by this thesis is to refine the generic picture of the dynamic susceptibility, including the temperature evolution of primary and secondary relaxation phenomena. The other objective is …
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Characterization of neural ion regulation dysfunction during insult and evaluation of micro-opioid receptor activation during simulated ischemia in the pre-botzinger complex
… flux affects characterization of brain tissue by dielectric spectroscopy and what can be done to overcome that effect. Second, it investigates how ion flux can be used to describe the state of health of the tissue. Finally, it investigates if pharmacological intervention can attenuate some of the …
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The cure of and moisture ingress into epoxy resins
… the cure of several epoxy resin systems using dielectric spectroscopy, DSC, FT-IR spectroscopy and rheology measurements. It was hoped to build up an understanding of the cure process and correlate the results produced by the different methods to establish whether dielectric spectroscopy can be …
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Development of Dielectric Spectroscopic Resonant Sensors for Biomedical and Industrial Applications
… research entailed the development of resonant dielectric sensors that utilising alternating electric fields at microwave frequencies. Characterisation and identification of biological samples is currently an expensive and time consuming procedure due to the extreme variation of seemingly …
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CHARACTERIZATION OF ELECTROSPRAYED POLY(VINYLIDENE FLUORIDE)/CNT NANOCOMPOSITE
… Differential Scanning Calorimetry (MDSC), Dielectric spectroscopy, Thermally Stimulated Current (TSC), Fourier Transform Infrared Spectroscopy (FT-IR), and X-Ray Diffraction (XRD). MDSC results show that electrosprayed PVDF has a lower melting point temperature than that of PVDF …
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Structure and Dynamics of Confined Molecules
Dielectric spectroscopy was employed within a SFA in order to investigate confinement effects on the dynamics of liquid crystal thin films. No shift upon confinement was observed for the molecular tumbling and flip motions in the nematic state. However, an interesting difference was observed as a …
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Ionic Mobility In Stuffed-Silica Minerals
Using a combination of dielectric spectroscopy and atomistic computer simulation techniques, the dynamical behaviour of loosely bound cations in the stuffed-silica minerals nepheline, yoshiokaite and ß-eucryptite has been investigated. The investigation has been extended to include the feldspar …
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Dielectric studies of novel polymeric systems
… The primary characterization method was dielectric spectroscopy which utilizes an AC electric field as the stress field. A variety of new, well controlled polymeric systems were studied. The first series included a number of radial starblock copolymers, styrene/isoprene, t-butyl- …
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Electromechanical Characterization of Poly(Dimethyl Siloxane) Based Electroactive Polymers
… are characterized by performing tests such as Dielectric Spectroscopy, Differential Scanning Calorimetery and Thermally Stimulated Current measurement. These techniques offer complete understanding of the structure-property relationship and effects of the functional groups on the dielectric and …
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Micro-bioreactor design for Chinese hamster ovary cells
… In this thesis, we also propose the use of dielectric spectroscopy electrodes for online cell viability sensing of CHO cells in micro-bioreactors. The electrodes are fabricated on polycarbonate, a biocompatible and optically clear thermoplastic that will be one of the future base material …
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Structure-property relationships in strontium barium niobate relaxor ferroelectrics
… x) have been performed using a combination of dielectric spectroscopy, Sawyer-Tower polarization techniques, and transmission electron microscopy (TEM). The dielectric response was found to be strongly dependent on crystallographic orientation, in distinct comparison to the nearly orientation …
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Characterization of photocurable networks in real-time and post-exposure
… were monitored in real-time via remote sensing dielectric spectroscopy. The relationship between exposure intensity and vitrification time revealed the exposure conditions necessary to shift the crosslinking rate from reaction kinetics controlled to diffusion kinetics controlled. The effect of …
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Bismuto mangano oksido ir giminingos keramikos dielektriniai tyrimai /
… the creation of innovative technologies. The dielectric and electric properties of BiMnO3 and (Bi0.06Na0.94)(Mn0.04Nb0.96)O3 ceramics were studied in this work. Complex dielectric permittivity was measured of BiMnO3 in temperatures ranging from 140 K to 500 K and in frequencies from 20 Hz up …
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Time-dependent dielectric response of polymer nanoparticulate composites containing rapidly oscillating source terms
… for the macroscopic response of time-dependent dielectric composites that contain space charges varying spatially at the length scale of the microstructure and that are subjected to alternating electric fields. The focus is on dielectrics with periodic microstructures and two fairly general …
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Characterization of PF Resol/Isocyanate Hybrid Adhesives
… parallel-plate oscillatory cure rheology, and 8) dielectric spectroscopy. The neat PF analytical results were unremarkable with one exception; NMR revealed that the formaldehyde/phenol mole ratio in one resin substantially differed from the target mole ratio. The neat PF resins were subsequently …
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The development of micro-sample electrical impedance analysis for freeze-drying process development
… prediction of freezing/drying rate, (3) study dielectric relaxation of ice and sugar solutions using interdigitate electrode and evaluate using electrical circuit elements. Method: The initial stage of the project involved a comprehensive study of water/ice using the broadband frequency range …
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Nanoseconds for the masses
… Several use cases are presented: Differential dielectric spectroscopy, LIDAR, and USB 3 SuperSpeed channel sounding.
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High-Velocity Microparticle Impact for Analytical Modelling of High-Strain-Rate Mechanics and Material Behavior
… impact measurements are then compared with dielectric spectroscopy results to link the impact behavior with the glassy transition. For metals, high-velocity impacts are performed and characterized using in situ observations, post-impact microscopy, and analytical modelling. Observations of a …
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