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Showing 1 to 20 of 58 for “"supercritical CO2"”.
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Saturation and foaming of thermoplastic nanocomposites using supercritical CO2.
… (PS) nanocomposite foams were prepared using supercritical fluid (SCF) CO2 as a solvent and blowing agent. PS was first in-situ polymerized with a range of concentrations of montmorillonite layered silicate (MLS). The polymerized samples were then compression molded into 1 to 2mm thick …
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Supercritical CO2 foamed biodegradable polymer blends of polycaprolactone and Mater-Bi.
Supercritical CO2 foam processing of biopolymers represents a green processing route to environmentally friendly media and packaging foams. Mater-Bi, a multiconstituent biopolymer of polyester, starch and vegetable oils has shown much promise for biodegradation. The polymer, however, is not …
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Cross-Linked PDMS Expansion Due to Submersion in Liquid and Supercritical CO2
… Polydimethylsiloxane (PDMS) submersed in supercritical carbon dioxide (scCO2) was studied. The purpose of this investigation was to advance micro-corrosion sensor technology utilizing PDMS and micro-metal particle composite as the sensing element currently under-development. One of the key …
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An investigation of the supercritical CO2 cycle (Feher cycle) for shipboard application
Thesis. 1977. Ocean E.--Massachusetts Institute of Technology. Dept. of Ocean Engineering.
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Entrapment of insulin into nanometric liposomes produced by supercritical CO2 for oral administration
O diabetes mellitus é uma desordem metabólica grave resultante das falhas da ação e/ou secreção de insulina. O tratamento mais utilizado para essa enfermidade é a administração subcutânea de insulina. Entretanto, a administração crônica dessa proteína pode causar alguns efeitos adversos, como …
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Feasibility of supercritical CO2 coaxial heat exchanger geothermal well conversion with ECO2G technology
… non-producing geothermal wells to closed loop supercritical CO2 coaxial heat exchanger using ECO2G technology was analyzed for two heat exchanger scenarios. The first scenario, Case A, utilizes the existing production casing as the heat exchanger and plugs the well at 1000 m depth to create the …
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Thermal Boundary Condition Effects On Local Supercritical CO2 Heat Transfer Trends In Tubes
<p>Supercritical carbon dioxide (sCO2) is a promising heat transfer fluid for the refrigeration and power generation industries due to its unique thermal properties and low environmental impact. To understand it as an alternative to traditional working fluids, the thermophysical and heat transfer …
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Fundamental behaviour and micronisation of Fischer-Tropsch waxes via supercritical CO2 PGSS processing
… saturated solution (PGSS) process, via use of supercritical CO₂ (sc-CO₂) as plasticiser, offers a promising alternative to harsher traditional methods used to produce particles in the micron size range (“micronisation”). PGSS micronisation with sc-CO₂ is a safe and cost-effective process, thus …
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Specifics of forced-convective heat transfer to supercritical CO2 flowing upward in vertical bare tubes
… in the forced convection regime of fluids at supercritical conditions has been studied extensively for the past 60 years. The dominant approach to summarize the experimental results was by proposing empirical correlations for the data within the investigated range of parameters. It was soon …
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An experimental study of supercritical CO2 flow in pipes and porous micro-models for carbon sequestration applications
The flow of high-pressure, near-critical CO2 in configurations relevant to CO2 sequestration was investigated. The first configuration was CO2 flow in pipes and orifices at pressures and temperatures close to the critical point of CO2 (74 bar, 31°C). A 60-cm-long stainless steel pipe with 2.1 mm …
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A supercritical carbon dioxide cycle for next generation nuclear reactors
… constraints has been performed of the family of supercritical CO2 Brayton power cycles for application to advanced nuclear reactors. The recompression cycle is shown to excel with respect to simplicity, compactness, cost and thermal efficiency. The main advantage of the supercritical CO2 cycle is …
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Characterization and modeling of the stress and pore-fluid dependent acoustic properties of fractured porous rocks
… velocities were monitored during injection of supercritical CO2 in samples of Berea sandstone initially saturated with saline water and under constant confining stress. Changes in seismic wave velocity were measured at different levels of supercritical CO2 saturation as the initial saline water …
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Formation of Cyclodextrin-Drug Inclusion Compounds and Polymeric Drug Delivery Systems using Supercritical Carbon Dioxide
… complexes as the drug delivery component. Supercritical CO2 was explored as the main processing fluid in the complex formation and in the foaming of the polymer scaffold. The co-solvents, ethanol, ethyl acetate and acetone, were explored in each stage, as needed, to improve the solvent …
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Design and Fabrication of Polyvinylidene Fluoride for Triboelectric Nanogenerators
… using different fabrication methods such as supercritical CO2 processing, non-isothermal crystallization, electro-poling and electrospinning. The results confirmed increasing in PVDF electroactive phase content positively affected triboelectric properties. Consequently, by fabrication of …
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Evaluation of biomass from the halotolerant microalga Dunaliella salina as an animal feed additive with immune-modulatory activity
… from algae, and this is growing at ~4 % p.a. Supercritical CO2 extraction of high-value carotenoids yields a solvent-free defatted powder. This material was sourced from biomass cultivated across different seasons from two different cultivation sites, namely a coastal Mediterranean site, which …
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Preparation of highly reflective films by supercritical infusion of a silver additive into poly(ether ether ketone)
… in the last few years. The application of supercritical fluid technology in this area is beginning to receive a great deal of attention. Poly ether ether ketone (PEEK) is well known for its excellent thermal, chemical, mechanical and electrical properties. These properties make it ideal for …
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Process-morphology-property Relationships in Strut-like Poly(ether ether ketone) Aerogels Prepared through Thermally Induced Phase Separation
… prepared with vacuum-drying, freeze-drying, and supercritical CO2 extraction with minimal shrinkage and deformation. The weaker globular PEEK aerogel morphologies suffered from considerable shrinkage due to capillary forces or ice crystal growth induced on vacuum-drying or freeze-drying, …
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Evaluating Nuclear Energy Power Conversion Cycles for Microreactors
… turbine and pump efficiencies for water and CO2. An additional capability is included which can estimate the effect of a regenerative heat exchanger in the conversion cycle. A reference design was picked to show the ability of the analysis tool to effectively compare different primary fluids …
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