Results 271 to 280 of about 102,133 (316)
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Amphiphiles for supercritical CO2
Biochimie, 2012A semi-fluorinated hybrid amphiphile, pentadecafluoro-5-dodecyl (F7H4) sulfate, has been shown to form reversed micelles in dense CO(2); the aggregates evolve to form water-in-CO(2) (w/c) microemulsion droplets on addition of water. Aggregation structures in these w/c phases have been characterised by small-angle neutron scattering (SANS), showing the ...
Cummings, Stephen +4 more
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Supercritical Transitiometry of Polymers
Analytical Chemistry, 1998Employing supercritical fluids (SCFs) during polymers processing allows the unusual properties of SCFs to be exploited for making polymer products that cannot be obtained by other means. A new supercritical transitiometer has been constructed to permit study of the interactions of SCFs with polymers during processing under well-defined conditions of ...
S L, Randzio, J P, Grolier
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Solvation in supercritical water
The Journal of Chemical Physics, 2006Solvation in supercritical water under equilibrium and nonequilibrium conditions is studied via molecular dynamics simulations. The influence of solute charge distributions and solvent density on the solvation structures and dynamics is examined with a diatomic probe solute molecule. It is found that the solvation structure varies dramatically with the
Jinsong, Duan +2 more
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Simulation of supercritical water and of supercritical aqueous solutions
The Journal of Chemical Physics, 1991Molecular dynamics (MD) calculations have been performed to determine equilibrium structure and properties of systems modeling supercritical (SC) water and SC aqueous solutions at two states near the critical point using the simple point charge (SPC) potential model of Berendsen et al. for water.
P. T. Cummings +4 more
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Supercritical impregnation of polymers
Current Opinion in Solid State and Materials Science, 2003The interest in the supercritical fluid impregnation of polymeric materials stems from the opportunity to utilize high diffusivity, low surface tension and the ease of solvent recovery for the preparation of new polymeric materials. This term includes a wide range of applications of the supercritical impregnation process that will be discussed in this ...
KIKIC, IRENEO, VECCHIONE F.
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Chromatography with Supercritical Fluids
Science, 1987In supercritical fluid chromatography (SFC) the mobile phase is neither a gas nor a liquid, but is a supercritical fluid. As a result of the unique properties of supercritical fluids, SFC is rapidly becoming a prominent separation technique for the analysis of reactive, thermally labile, and nonvolatile compounds.
M L, Lee, K E, Markides
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Supercritical fluid processing
Environmental Science & Technology, 1986Separation and detoxification reactions often can be run advantageously using supercritical fluids (SCFs) as processing media. The use of a supercritical solvent frequently permits extraction of very dilute toxic species, either directly or in a two-step process.
C A, Eckert, J G, Van Alsten, T, Stoicos
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Understanding supercritical speedup
ACM SIGSIM Simulation Digest, 1994Simulations running under Time Warp using lazy cancellation can beat the bound given by the critical path. We explain this phenomenon to be the result of a kind of intra-object parallelism. Specifically, we show that instances of beating the critical path, called supercritical speedup , are made possible by messages
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Journal of Chromatography A, 1990
Abstract Comparisons of supercritical propane and supercritical carbon dioxide eluents were made on bare silica and octadecylsilane-derivatized silica using substituted and unsubstituted aromatic hydrocarbons as test solutes. The greater elution strength of carbon dioxide relative to propane for these solutes on underivatized silica is indicated to ...
C.H. Lochmüller, L.P. Mink
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Abstract Comparisons of supercritical propane and supercritical carbon dioxide eluents were made on bare silica and octadecylsilane-derivatized silica using substituted and unsubstituted aromatic hydrocarbons as test solutes. The greater elution strength of carbon dioxide relative to propane for these solutes on underivatized silica is indicated to ...
C.H. Lochmüller, L.P. Mink
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Supercritical Fluid Chromatography
Science, 1983Chromatographic separations with a supercritical fluid as the mobile phase were suggested more than 20 years ago. Availability of commercial hardware makes this technique more widely usable today. Many separations by this method are now carried out with supercritical carbon dioxide as the mobile phase and packed liquid-chromatography ...
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