RESS Rapid Expansion

RESS [Rapid Expansion of Supercritical Solutions] A process for depositing a film of solid material on a surface. The substance is dissolved in supercritical carbon dioxide. When the pressure is suddenly reduced, the fluid reverts to the gaseous state and the solute is deposited on the walls of the vessel. Used for size-reduction, coating, and microencapsulation. First described in 1879. Developed in 1983 by R. D. Smith at the Battelle Pacific Northwest Laboratory. [Pg.227]

RESS Rapid expansion of supercritical solutions through a nozzle causing rapid nucleation of product into highly dispersed nanoparticles... [Pg.192]

Abbreviations ASES, aerosol solvent extraction system BSA, bovine serum albumin PCA, precipitation with compressed antisolvent PLA, polylactic acid PLGA poly(lactic-co-glycolic acid) PMMA, poly(methyl methacrylate) PPG, poly(propylene glycol) RESS, rapid expansion of supercritical solution TFE, 2,2,2-trifluoroethanol. [Pg.377]

Abbreviations GAS, gas antisolvent HPC, hydroxypropylcellulose PEG poly(ethylene glycol) PPG, polyipropylene glycol) PLA, poly(lactic acid) PVCVA, poly(vinyl chloride-co-vinyl acetate) RESS, rapid expansion of supercritical solution. [Pg.395]

In our laboratory, we have modified the supercritical fluid processing method known as RESS (Rapid Expansion of Supercritical Solution) (7 J-7S) by expanding the supercritical solution into a liquid solvent, or RESOLV (Rapid Expansion of a Supercritical Solution into a Liquid SOLVent), to produce nanoscale semiconductor and metal particles (7, 9, 19-22). For the solubility of metal salts, supercritical ammonia, THF, and acetone were used in the rapid expansion at relatively higher temperatures. The nanoparticles thus obtained were small (less than 10 nm), with relatively narrow size distributions. In an effort to replace the organic solvents with C02-based systems for RESOLV at ambient temperatures, we used a water-in-C02... [Pg.310]

Micro-encapsulation of drug-polymer systems using flic RESS (Rapid Expansion of Supercritical Fluid Solutions) techniques have been initiated with limited success due to poor understanding of the complex phenomena involved in co-nucleation of components. Not only do the particles have to be nucleated with the desired particle size and shape but also encapsulate the material simultaneously in an uniform fashion. [Pg.1454]

ASES aerosol solvent extraction system, GAS gas antisolvent precipitation, PGSS precipitation from gas-saturated solutions, RESS Rapid expansion of supercritical solutions, SAS supercritical... [Pg.589]

Repeat step 1 using ethanol for both copper and phenylenediamine solutions. This time, when you vent the system after 45 min, place a carbon TEM grid at the base of the collector vessel (the instmctor will point this out). This technique, known as RESS (rapid expansion of the supercritical solution), is a unique benefit of performing reactions in supercritical fluids. When the system is vented, the gas/liquid carbon dioxide expands, being rapidly converted from its original... [Pg.699]

Besides the supercritical fluid extraction (SFE) for preparation of medicines and materials processing, supercritical fluid technology involves processes such as supercritical anti-solvent (SAS), rapid expansion supercritical solutions (RESS), rapid expansion of a supercritical solution into a liquid solvent (RESOLV), supercritical assisted atomization (SAA), impregnation and solution enhanced dispersion by supercritical CO2 (SEDS) that involves the supercritical fluid in drug processing to drug delivery systems. [Pg.2]