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Showing 1 to 20 of 101 for “"aerogel"”.
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Thermal properties of advanced aerogel insulation
… for a new, easily installable, inexpensive, thin aerogel-based insulation and goes into detail on how the thermal properties of the aerogel were measured and validated. The transient hot-wire method for measuring the thermal conductivity of very low thermal conductivity silica aerogel (1 0mW/m K …
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Performance of aerogel composite and foam insulations
… available insulating materials (three aerogel composite blankets, two extruded poly- styrene foams (XPS) and one blown polyurethane foam (PUR) on plywood ) were evaluated. Thermal conductivity (reciprocal of resistivity) was measured with a heat flow metering apparatus at one week in- …
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Aerogel coated metal foams for dehumidification applications
Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2013-08-30T14:44:52Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Nawaz_Kashif.pdf: 3672800 bytes, checksum: aba11b231fa7266a2a5495204b4f469b (MD5) Nawaz_Kashif.pdf: 6965739 bytes, …
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Truss core sandwich panels with compacted aerogel insulation
Silica aerogels are well known for their low thermal conductivity, approximately 15 mW/m-K. Their low relative density (typically less than 5%) reduces conduction through the solid and their small pore size, typically less than one hundred nanometers, on the order of the mean free path of air, …
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Structure Evolution of Silica Aerogel under a Microwave Field
Structure evolution of silica aerogel was studied in microwave- and conventionally processed samples over the temperature range from 25 to 1200â °C. The samples were produced using sol-gel processing and dried under carbon dioxide supercritical conditions. After drying, the monolithic samples …
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Adsorption of organic Iodides on Reduced Silver Functionalized Silica Aerogel
… material, reduced silver functionalized silica aerogel (Ag0-Aerogel), was developed at the Pacific Northwest National Laboratory (PNNL), and has been considered as an outstanding material for its high silver content and adsorption rate. The efficiencies of the three materials were evaluated and …
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Sintesi e caratterizzazione di nanocompositi aerogel altamente porosi per applicazioni catalitiche
… and catalytic applications of nanocomposite aerogels, made out of an active nanophase dispersed in a highly porous amorphous silica matrix. These nanocomposites have unique properties which mainly depend on the composition, size and distribution of the nanoparticles and on the morphology and …
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Thermal properties of granular silica aerogel for high-performance insulation systems
… panelized insulation system based on silica aerogel. Two test methods were used for measuring the thermal conductivity of the granules: the transient hot-wire technique and the guarded hot-plate system. Utilizing the hot-wire set-up, it was demonstrated that compressing a bed of granules will …
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Generation of Titanium Dioxide Parts using Cellulose Nanocrystal Aerogel Hard Templates
… dioxide (TiO2) using cellulose nanocrystal (CNC) aerogel hard templates for photocatalytic and biomaterial applications. Suspensions of CNCs in water varying in solid loading from 20 mg/mL to 100 mg/mL were prepared and frozen at three different temperatures (-20 °C, -40 °C, or -80 °C) using four …
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Investigation and Characterization of Composite Silica Aerogel Nanostructures Obtained Via Magnetron Sputtering
… of Copper (Cu) onto hydrophilic Silica Aerogel (SA) monoliths using magnetron sputtering, with Cu thicknesses of 20 nm, 50 nm, and 100 nm. Leveraging the mesoporous nanostructure of SA, a Cu-sputtered SA nanocomposite was fabricated, creating a non-homogeneous nanocomposite material. …
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Experimental and ANSYS investigation on the aerogel envelopes for energy-efficient building
… the heat loss in buildings or homes. Silica aerogels have grown in popularity as an insulating material due to their extremely low thermal conductivity. Very often the benefits of transparency as well as strength is ignored due to its brittleness. An effort has been taken to increase the …
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Influence of Compressible Aerogel Electrodes on the Properties of an Electrochemical Cell
… were first electrolyzed in the gel creating an aerogel, and that this effect was virtually undetectable without the bubbles present. Using electrochemical impedance spectroscopy (EIS) and model fitting, it was shown that this effect occurs at the electrode interface. Theoretical derivation …
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Effect of Aerogel on the Thermal Performance of Corrugated Composite Sandwich Structures
… and ineffective when considering their volume. Aerogels are excellent insulators, exhibiting low thermal conductivities and low densities with a porosity of around 95%. Such characteristics make aerogels effective in decreasing conductive heat transfer within a solid. These requirements are …
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Fabrication of carbon-aerogel electrodes for use in phosphoric acid fuel cells
… to determine the ability to fabricate carbon aerogel electrodes for use in a phosphoric acid fuel cell (PAFC). It was found that the use of a 25% solution of the surfactant Cetyltrimethylammonium chloride (CTAC) in water resulted in the creation of micelle within the pores of the organic …
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Spectroscopic Studies of Small Molecule Oxidation Mechanisms on Cu/TiO2 Aerogel Surfaces
… supported metal nanoparticles and TiO2. Cu/TiO2 aerogels were identified as a candidate for more in-depth studies. Flow reactor methods in combination with the surface-based infrared spectroscopy were utilized to elucidate the CO oxidation reaction mechanism over Cu/TiO2 aerogels. Bridging oxygen …
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Advanced thermal insulation for energy efficient buildings : structural performance of aerogel composite panels
Aerogels are well known as exceptional thermal insulators. Thermal conductivities of 9 to 10 mW/m.K have been achieved at atmospheric pressure, and a moderate vacuum (between 1/3 and 1/10 of an atmosphere) can lower this number even further, to around 5 mW/m.K. However aerogels for insulation …
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Optically transparent, thermally insulating and soundproofing (OTTIS) aerogel for high-efficiency window applications
Building heating, ventilation and air conditioning (HVAC) accounts for about 13.6 quadrillion BTU ("quads") per year or 14% of the total energy consumption in the United States.' Accounting for 39% of annual US carbon dioxide emissions, this consumption is directly related to the energy efficiency …
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Experimental investigations of using silica aerogel to harvest unconcetrated sunlight in a solar thermal receiver
… a prototype flat plate collector using silica- aerogel. Optically Transparent Thermally Insulating silica aerogel with its high transmittance and low thermal conductivity is used as a volumetric shield. The prototype collector was subjected to ambient testing conditions during the months of …
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Inverse solid-liquid fluidization of aerogel granules and its application in removing oil from water
… pressure drop) of an inverse fluidized bed of aerogel granules and using this system to remove oil from an oil-water mixture. The solid particles employed for this study are low density (100 kg/m^3) surface treated hydrophobic aerogel (Nanogel ) granules of size in the range of 0.5 to 2.3 mm. …
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Engineering carbon nanostructures : development of novel aerogel-nanotube composites and optimization techniques for nanotube growth
Carbon aerogels offer several unique advantages which make them ideal for evaluating a metal's ability to catalyze nanotube growth, including in situ carbothermic reduction of oxidized nanoparticles to their catalytic metallic phase as they form and production of a bulk quantity of nanoparticles …
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