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 714 for “"gels"”.
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Binary diamondoid molecular gels
We demonstrate the formation of gels composed of saturated carbon cage, diamondoid molecules that are rendered attractive through acid-base, non-covalent interactions (hydrogen bonding either with or without proton transfer). The gels are formed by mixing dimethyl sulfoxide (DMSO) solutions of …
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Nucleation of Cavities in Gels
Many implantable devices are made of synthetic polymers which upon insertion absorb water, causing the polymer to swell and form a gel (mixture of solid and fluid). Since the swelling leads to an expansion of the polymer, a gel is considered to be a compressible material. A high concentration of …
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Chemomechanics of self-oscillating gels
… In this thesis, self-oscillating polymer gels comprising N-isopropylacrylamideco- Ru(bpy) 3 are synthesized in order to elucidate chemical and mechanical (chemomechanical) coupling in synthetic, stimuli-responsive materials, and to design mechanically induced, oscillatory signaling …
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Kinetics of gelation in photoreversible gels
… This thesis explores light sensitive gels and colloids, which could be used as valves in microfluidics devices, as tunable templates for the production of nanoparticles, or as devices for capturing pollutants or delivering drugs. At the basis of the sensitivity to light is the …
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Convective transport of macromolecules in gels
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1999.
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Transport through macromolecular solutions and gels
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Inducing Liquid Evaporation with Hygroscopic Gels
… behavior of humans and to test the synthesized gels. Hygroscopic materials readily absorb and/or adsorb water from a humid environment. The hygroscopic gel can cause long-range evaporation of water from the sweat leading tocrystallization of minerals which can ultimately clog the sweat duct and …
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The Rosensweig instability in isotropic magnetic gels
Die vorliegende Arbeit befasst sich mit der nichtlinearen theoretischen Analyse der Rosensweig Instabilität in isotropen magnetischen Gelen. Die Rosensweig Instabilität beschreibt den Übergang einer zunächst flachen Oberfläche zwischen einer magnetischen Flüssigkeit zu einer hexagonal geordneten …
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Block copolymer Ion gels for CO2 Separations
… to study the gas separation performance of ion gels for CO2 separation, and seek ways to optimize their properties in terms of the gas separation performance and mechanical strength. Ionic liquids have shown great promise as novel CO2-separation media, largely due to their highly selective gas …
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Oscillating Aqueous Gels as Drug Delivery Systems
Aqueous liquid crystal gels formed by surfactant/cosurfactant/oil/water systems have been studied as potential novel controlled release drug delivery systems. They possess a unique oscillating property that was evaluated as a means of controlling drug release dependent upon intentional structural …
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Stimuli responsive polymer gels for sensing applications
… the photopatterning of electro-active hybrid sol-gels that are based on the chemical composition (MAPTMS,ZrPO,MAAH) as introduced in chapter 4. For these studies however, the hybrid materials are based solely on Zr metallate complexes. The electroactive species that become encapsulated within the …
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Novel Smart Polymer Based In Situ Gels
The objectives of this investigation were to investigate the effect of interaction of protein and polymers with varying end groups on the overall release profile of model proteins (Lysozyme, Bromelain and Bovine Serum Albumin (BSA)). Lactide and/or glycolide-based polymers (intrinsic viscosity 0.15 …
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Structure-property relationships in physical polymer gels
Associating polymer networks are included in a large number of materials where it is important to control and tune the rheological response of the material, particularly including responses to temperature, shear, or changes in the surrounding environment. Knowledge of the relationship between the …
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Commercial applications of block copolymer photonic gels
Block copolymer photonic gels are a simple and easily processed material which responds rapidly to environmental stimuli through a color change. The diblock copolymer that forms the gel self-assembles into a lamellar structure that has the potential to reflect light over a broad range of …
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Molecular imprinting and recognition in heteropolymer gels
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
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Mechanics of amorphous polymers and polymer gels
… with a solvent, and certain thermally-responsive gels can undergo large reversible volume changes as they are cycled about a critical temperature. We have developed a thermodynamically-consistent continuum-level theory to describe the coupled mechanical-deformation, fluid permeation, and heat …
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Structure and Dynamics of Associative Polymer Gels
Associative polymers have attracted wide attention for applications spanning biomedicine, soft robotics, and rheological modification due to their unique viscoelastic and stimuli-responsive properties imparted by their dynamic bonds. However, predicting the response of associative polymer networks …
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Structure and critical behavior of polymer gels
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1989.
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Mathematical and Experimental Analysis of Microbicide Vaginal Gels
… Many currently available vaginal spermicidal gels are applied using a syringe-like applicator. After vaginal application, several physical forces will perturb the gel: gravity, squeezing, surface tension and shearing. In this document I will outline the work that has been completed, for an …
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