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.
Results
Showing 1 to 20 of 75 for “"polymer solution"”.
-
Kinetic theory for dilute and concentrated polymer solution study of nonhomogeneous effects
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1993.
-
Impact of polymer solution aggregation and assembly on organic solar cell morphology and device properties
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms
-
Poly (2,6-dimethyl-1,4-phenylene oxide) hollow fibres for gas separation.
… prepared by the dry-wet spinning method from solutions of PPO in trichloroethylene using the non-solvent methanol as the bore liquid and for the gelation bath. The variables studied were the length of the air gap, the flowrates of the bore liquid and polymer solution and the presence of …
-
Phase separation in thermally-drawn fibers: From porous domains to structured Si-Ge spheres
… versatile process that allows the fabrication of polymer or glass-based fibers with complex multimaterial internal structures, which grant them functions ranging from optical transmission to chemical detection. However, while a wide range of materials have been successfully drawn in various phases …
-
Gas permeation properties and characterization of mitrimid based carbon tubular membrane
… the effect of carbonization parameter such as polymer composition, carbonization temperature, and carbonization environment on the gas separation properties. Polyimide (Matrimid 5218) was used as a precursor for carbon tubular membrane to produce high quality of carbon membrane via …
-
Responsive polymers for dynamic modulation of bio-macromolecular transport properties
Responsive self-assembling polymers are used in wide range of applications in the food, pharmaceutical, agricultural, electronic and environmental industries, as well as in the biomedical field. The proper design of such polymers is critical for the particular applications being considered. In this …
-
Luminescent, quantum dot-based anti-reflective coatings for crystalline silicon photovoltaics
… potential application of luminescent quantum dot/polymer solutions on crystalline silicon photovoltaics. After spin coating the QD/polymer onto silicon photodiodes, an increase of 3% in current density was observed. This performance improvement was used to determine the impact application would …
-
Surface modification of electrospun poly(vinylidene fluoride) nanofibrous microfiltration membrane
… fibers through an electrically charged jet of polymer solution/melt. These electrospun fibers have been explored in various applications such as scaffolds for tissue engineering, drug delivery carrier, biosensor/chemosensor, reinforced nanocomposite and electronic and semi-conductive materials. …
-
Soft hydrated sliding interfaces as complex fluids
… aqueous component. Recent studies have shown polymer concentration gradients resulting in a less dense region in the top micrometers of the surface. Under shear, this gradient is hypothesized to drive lubrication behavior due to its rheological similarity to a semi-dilute polymer solution. In …
-
The mechanical testing of single nanofiber
Polymer nanofibers exhibit properties that make them a favorable material for the development of tissue engineering scaffolds, filtration devices, sensors, and high strength lightweight materials. Perfectly aligned PLLA Nanofibers were fabricated by an electrospinning technique under optimum …
-
Polymer dynamics and fluctuations probed with fluorescence methods
The arc of the thesis is direct measurement of polymer chain properties with potent fluorescence methods imported from other interdisciplinary sciences and applied successfully to polymer physics problems for the first time. The focus is an important theme in equilibrium polymer physics - chain …
-
Simulations of polymeric membrane formation in 2D and 3D
… precipitation process makes most commercial polymeric membranes, which enjoy widespread use in water filtration and purification. In this work, a ternary Cahn-Hilliard formulation incorporating a Flory-Huggins homogeneous free energy function is used to model both initial diffusion and the …
-
Spatiotemporal Signatures of Elastoinertial Turbulence
The addition of small amounts of polymers to a Newtonian solvent makes the fluid viscoelastic, and can lead to significant drag reduction in high-speed flows. The interaction of viscoelasticity and inertia in a dilute polymer solution results in the emergence of unique inertioelastic instabilities. …
-
Developing a labview based thermally stimulated current (tsc) controller to measure residual charge in electrospinning
… field to overcome the surface tension of the polymer solution to extrude a fine jet of fluid which deposits on the grounded collector as a nanofiber mat. Using this process, nanofibers with diameters less than a micron can be produced. Previous studies have shown the presence of residual …
-
Dynamics of nanoparticles in complex fluids.
… is a subfield of condensed matter including polymers, colloidal dispersions, surfactants, and liquid crystals. These materials are familiar from our everyday life- glues, paints, soaps, and plastics are examples of soft materials. Many phenomena in these systems have the same underlying …
-
The incorporation of electrohydrodynamics and other modifications into a dry spinning model to develop a theoretical framework for electrospinning
… employs an electric field to propel a stream of polymer solution to create the sub-micron diameter fiber. Although much research has been done on the process itself, its wide-scale adoption has been inhibited by a lack of predictive control on the fiber properties. By developing an accurate …
-
Complementary strategies to promote the regeneration of bone-ligament transitions using graded electrospun scaffolds
… first strategy involved co-electrospinning two polymers (one doped with hydroxyapatite) from offset spinnerets onto a rotating drum to produce scaffolds possessing a gradient in mineral content. Post-electrospinning, these graded scaffolds were treated with a simulated body fluid to further …
-
A Novel Technique for Fabricating Aligned Nanofibers by Using Solution Electrospinning
… been created by using new designed apparatus. Solution electrospinning has been used for nanofibers fabrication. During solution electrospinning, when two negative (-20kV) charged wheels and a positive (+20kV) charged needle were placed in the system, aligned nanofibers were collected on the …
-
Statistical Physics of Semidilute Polymer Systems (And); Soft Billiard Systems
… we carefully study the semidilute regime of polymer solutions. The renormalization group (RG) method using the $\varepsilon$-expansion has been a systematic method giving good semiquantitative agreement with both real and computer experiments for the static and dynamical properties of …
-
Electrospun membranes for implantable glucose biosensors
… in our workshop and used to electrospin single polymer - Selectophore™ polyurethane (PU) and two polymer (coaxial) – PU and gelatin (Ge) fibre membranes. Extensive studies involving optimization of electrospinning parameters (namely solvents, polymer solution concentration, applied electric …
Page 1 of 4