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 33 for “"Polymer gel"”.
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Polymer gel spinning machine
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Polymer gel actuators and sensors
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Polymer Gel Dosimetry in Magnetic Resonance-Image Guided Radiation Therapy
… prior to any routine patient treatment. Polymer gel detectors have previously been shown to be a useful tool to capture complex 3D dose distributions with steep dose gradients using an MR scanner for readout. Their properties make them favorable devices for the development of quality …
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Polymer gel based actuator : dynamic model of gel for real time control
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Readout of polymer gel dosimeters using a prototype fan-beam optical computed tomography scanner
… of an advanced dosimeter --- the polyacrylamide, gelatin, and tetrakis (hydroxymethyl) phosphonium chloride (PAGAT) dosimeter --- using a prototype fan-beam optical computed tomography (CT) scanner. A number of developments sought to improve the performance of the optical CT device. A new …
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Evaluation of Polymer Gel Dosimeters For Measurements of Dose and Let In Proton Beams
<p>This project assessed the effectiveness of polymer gel dosimeters as tools for measuring the dose deposited by and LET of a proton beam. A total of three BANG® dosimeter formulations were evaluated: BANG®-3-Pro-2 BANGkits™ for dose measurement and two BANG®-3 variants, the LET-Baseline and …
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Evaluation of the performance of different polymer gel systems as an in-depth gel treatment using numerical simulation
… occur.</p><p>Assessment of the potential of polymer flooding and gel treatment requires accurate modeling of different parameters that could affect these processes. Selecting of the best polymer gel system requires an understanding of its performance inside the reservoir. The main aim and …
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HIGH FIELD MAGNETIC RESONANCE IMAGING-BASED GEL DOSIMETRY FOR SMALL RADIATION FIELDS
… may be restricted to one or two dimensions. Polymer gel dosimetryer, is a three-dimensional (3D) dosimeter based on radiation-induced polymerization of tissue equivalent gelatin. Polymer gel dosimeters can be read using magnetic resonance imaging (MRI), which detects changes in relaxivity due …
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Computational Design of Viscoelastic Gels with Tunable Mechanical Energy Dissipation
… temperatures has propelled interest in using polymer gel systems that could potentially mimic the mechanical response of tissues. More generally, the capacity to tune the mechanical energy dissipation characteristics of such gels is of interest to a range of applications. The present work uses …
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A conjugated polymer plastic gel
We present a gel route to process highly oriented conjugated polymer films and fibers. The incorporation of hexafluoroisopropanol, a strong and stable dipolar group, to the polythiophene backbone enhances the solubility and especially, the hydrogen bond forming capabilities of the polymer. This …
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Preparation, Characterization, and Application of Molecular Ionic Composites for High Performance Batteries
… a crucial component of any solid state battery. Polymer gel electrolytes have received increasing attention in recent years due to their high ionic conductivity, flexibility, and improved safety. However, a general tradeoff usually exists between the mechanical properties and ionic conductivity …
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Design and characterization of a gel loading mechanism for an ultra-high throughput mutational spectrometer
… To successfully run CDCE, a high viscosity polymer gel must be loaded into each of the 10,000 channels, each of which are composed of an individual glass capillary with a 75 m inner diameter. A mechanism was designed and tested which loaded gel into 8 channels simultaneously. The mechanism …
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Elucidating Dual Methylcellulose-and-Oil-Nanoemulsion Thermoresponsive Gelation
The rheological properties of a colloidal gel depend upon the microstructure of the gel and the identity of the load-bearing elements. Here we demonstrate a hybrid hydrogel-colloidal gel system composed of a methylcellulose-stabilized oil nanoemulsion. This system has tunable rheology with two …
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Evaluation of yttrium-90 positron emission tomography dosimetry
… dose maps using standard S-kernel convolution. Polymer gel dosimetry was used to validate the 3D dose map results. Furthermore, PET, with associated CT images, were used as input data into MC simulations to model dose rates surrounding patients for future patient release studies. A …
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Design and Characterization of Electrospun Mats with Tailored Morphologies for Enhanced Active Layer Performance in Energy Conversion and Energy Storage Applications
… efficient ion diffusion pathways and beneficial polymer-ion interaction in polymer-gel electrolytes is demonstrated to result in enhanced battery performance. We demonstrate the ability to develop unique morphologies in Poly(3-hexafluoro propylene) (P3HT) films with energy storage applications …
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Nanoparticle Self-Assembly for the Synthesis and Processing of Ordered Nanocomposite Solids
… superlattice stability and processability into polymer nanocomposites. These methods include the addition of free polymer to the assembly solution as a simple means to controllably increase the stability of nanoparticle superlattices against thermal dissociation in solution, as well as a method …
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EVALUATION OF NOVEL PREFORMED PARTICLE GELS FOR CONFORMANCE CONTROL AND ACID STIMULATION THROUGH CORE FLOODING TESTS
… systematically evaluates two newly developed gels: Degradable Preformed Particle Gel (DPPG) and Re-crosslinkable Preformed Polymer Gel (RPPG). DPPG is designed to be a temporary plugging agent for acid stimulation and can self-degrade into a water-like fluid. RPPG is designed for reservoir …
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Investigation of Recrosslinkable Preformed Particle Gels for Natural Gas Conformance Control
<p>"Recross linkable Preformed Particle Gel (RPPG) is a novel type of preformed particle gel in which particles can bond together to form a strong bulk gel system after being placed in the target formation. In this research, I systematically evaluated the feasibility of using this product to …
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Cone Beam Optical Computed Tomography-Based Gel Dosimetry
… target accuracy of ± 5% for the dose delivery. Gel dosimetry is an attractive option for realizing a tissue-equivalent, 3D dose verification tool with high resolution readout capabilities. However, much important work remains to be completed prior to its acceptance in the clinic. The careful …
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Polymer Gels: Kinetics, Dynamics Studies and Their Applications as Biomaterials
The polymer gels especially hydrogels have a very special structure and useful features such as unusual volume phase transition, compatibility with biological systems, and sensitivity to environmental stimuli (temperature, pH value, electric field, light and more), which lead to many potential …
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