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Showing 1 to 20 of 40 for “"bicontinuous"”.
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A Confocal Rheology Study of Network Stabilized Bicontinuous Emulsion Gels
In this thesis, a new bicontinuous soft material was discovered. Bicontinuous intraphase jammed emulsion gels (bipjels) were formed from critical mixtures of water and 2,6-lutidine and were stabilized with commercially produced alumina coated silica nanoparticles. Using a novel confocal rheology …
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Structural study of lipid bicontinuous cubic phases for cellular delivery
Lipid bicontinuous cubic phase is fundamentally interesting phase. Initially it is considered as an intermediate structure between lamellar and hexagonal phases due to its small phase space and complicated structure. With the development of structure characterization technologies, especially X-ray …
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A SANS study of the interfacial curvatures and the phase behavior in bicontinuous microemulsions
… the first time in a practical way. In isometric bicontinuous microemulsions, the Gaussian curvature is negative and has a parabolic dependence on the surfactant volume fraction. In non-isometric systems, based on the measured interfacial curvatures, a characteristic structural transformation was …
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Design and fabrication of high power microbatteries and high specific strength cellular solids from bicontinuous microporous hierarchical materials
… hierarchical electrodes. The three-dimensional bicontinuous interdigitated microelectrode architecture improves power performance by simultaneously reducing ion and electron transport distances through the anode, cathode, and electrolyte. The microbattery power densities are up to 7.4 mW cm-2 …
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Stability of Nanoporous Metals
A study of the stability of bicontinuous nanoporous metals is presented. Atomic scale simulations are used to probe the dominant mechanisms of geometric relaxation in these materials. A method is presented for generating model bicontinuous metal / void structures for use in atomistic simulations of …
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Improving lithium-ion battery power and energy densities using novel cathode architectures and materials
… power and energy densities. Three-dimensional bicontinuous cathode structures should help improve the charge and discharge rate performances, while maintaining a high energy capacity. By controlling the pore architectures of the bicontinuous cathode structures, we hope to manipulate the power …
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Diffusion of proteins inside crowded structures generated using microemulsions
… microemulsion form different structures. In the bicontinuous phase continuous oil and water domains are present separated by a surfactant/co-surfactant film. At higher surfactant amounts the bicontinuous structure passes over to a droplet phase. The size of these structures is in the scale of up …
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Bitopological spaces
… for semi-compactness, semi-paracompactness, and bicontinuous functions are proposed and are related to the definitions of pairwise-separated spaces. Finally, quasi-pseudo-metric spaces are defined, and a number of quasi-pseudo-metrization theorems are summarized.
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Design, Synthesis and Self-assembly of Amphiphilic Cyclodextrin-Based Materials for Enhanced Ion Conduction and Drug Encapsulation
… have shown unprecedented ability to form bicontinuous cubic mesophases. Chapter 3 builds upon the findings of the previous chapter by enhancing the synthetic efficiency and investigating the ‘open’ crown-ether concept, achieved by incorporating linear OEG chains onto a benzene ring in …
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Bijels For Continuous Reactive Separations
… A recently developed class of soft materials, bicontinuous interfacially jammed emulsion gels or bijels provide opportunity to overcome the shortcomings of emulsions and membrane-based biphasic reactors. Bijels are made by triggering the spinodal decomposition of a homogenous mixture of fluids …
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Improving energy and power densities of three-dimensional next generation secondary battery electrodes
… doctor blade casting and a real 3D (~ 50 μm) bicontinuous porous carbon current collector was obtained. Sulfur and selenium was incorporated with the 3D BPC, achieving much higher loadings than the Ni inverse opal case and meanwhile demonstrating good electrochemical properties. The porous …
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Computational Studies of the Mechanical Response of Nano-Structured Materials
… capillary forces on the deformation response of bicontinuous metallic composites and porous materials. This research utilizes atomistic scale modeling to study nanoscale deformation phenomena with time and spatial resolution not available in experimental testing. Molecular dynamics techniques are …
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Pattern formation and magnetism in pulsed laser-induced self-organized nanostructures from single and bilayer metallic films
… nm, the early stages of dewetting consisted of bicontinuous structures, while above, it consisted of regular sized holes. This observation was consistent with a previously published theoretical argument that morphology was based on the film-thickness dependent location of the minimum in the free …
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A Mesoscale Dynamics study of the phases in surfactant-water ternary systems
… high-surface curvature phases, such as the bicontinuous cubic and mesh phases, in favour of the lamellar phase. However, the addition of anaesthetics and short-chained alcohols, which are small amphiphilic molecules, promote surface curvature, and there is an optimum chain length for maximum …
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Nanomorphology dependent optical and mechanical properties of aerogels
… trend whereas, all other factors being equal, bicontinuous structures were by several times stiffer than spheroidal nanostructures.</p><p>In order to develop silica aerogels as thermal insulators for windows, one must achieve a balance of clarity, strength, and thermal insulation value. Light …
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Ultra-lightweight nanorelief networks : photopatterned microframes
… were implemented for periodic and quasiperiodic bicontinuous polymer-air structures on the submicrometer length scale. For 3D quasiperiodically nanostructured materials, quasicrystalline phase mask lithography utilizing 2D quasiperiodic phase mask was successfully employed. 2D hexagonal arrays of …
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TEM/EDXS studies of phase separation in block and graft copolymers
… films showed phase transitions from disordered bicontinuous (M<sub>n</sub> = 5K) to lamellar (M<sub>n</sub> = 10K) to cylindrical <M<sub>n</sub> = 20K). Qualitative TEM/EDX analysis of other systems was used to identify oligomers, homopolymers, and contaminants, thus monitoring the effects of …
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Structural transitions in self-assembled lipid systems driven by induced curvature: from cell-penetrating peptides to programmable vesicles
… remodels vesicles into a porous ‘sponge-like’ bicontinuous manifold. By applying ideas from coordination chemistry, soft condensed matter physics and differential geometry, we propose a geometric mechanism facilitated by both electrostatics and bidentate hydrogen bonding. We also examined the …
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Transport properties of micellar solutions and microemulsions.
… and oil-continuous structures and also bicontinuous structures via wrhich phase inversion can occur. Phase diagrams were determined for C[12]E[4]-H[2]O-triacetin and Brij 30-H[2]0-triacetin. The differences between these systems and those with heptane and hexane as third components are …
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Aerogels for energy storage applications: From shape memory materials to thermites and explosives
… micrometer sized particles with thick necks to bicontinuous structures, that are typical of spinodal decomposition. A Marcus-type thermodynamic-kinetic relationship was identified between that shape recovery rate, R<sub>t</sub>(N), and the elastic modulus, E. Other part of the dissertation deals …
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