Interactions between supercritical (sc) CO2 and minerals are important when CO2 is injected into geologic formations for storage and as working fluids for enhanced oil recovery, hydraulic fracturing, and geothermal energy extraction. It has previously been shown that at the elevated pressures and temperatures of the deep subsurface, scCO2 alters smectites (typical swelling phyllosilicates). How...

One of the most promising developments of supercritical fluid technologies concerns today the field of inorganic, hybrid and organic materials processing. Two well known ways are generally associated to materials processing in supercritical fluids: the first way with processes based on a physical transformation (RESS, SAS, PGSS ... processes) and the second one with processes based on a chemica...

The objective of this work has been the co-precipitation of the coating material Ethyl Cellulose (EC) and two natural extracts (IDOKI SCF Technologies), R1 and P1, using the Supercritical Antisolvent (SAS) precipitation technique with supercritical carbon dioxide (SC-CO2), in order to obtain active microparticles. EC is a hydrophobic material widely used for controlled delivery systems, sustain...

In the present work, a modified equation of state has been presented for the calculation of volumetric properties of supercritical fluids. The equation of state is van der Waals basis with temperature and density-dependent parameters. This equation of state has been applied for predicting the volumetric properties of fluids. The densities of fluids were calculated from the new equation of state...

Griseofulvin (GF) is an antifungal drug whose pharmaceutical activity can be improved by particle size reduction. In this study the rapid expansion of supercritical solution (RESS) was employed to micronize GF. Carbon dioxide (CO2) with cosolvent acetone was chosen as a supercritical mixed solvent. The solubility of GF in supercritical CO2 with cosolvent acetone was measured using a dynamic app...

Production of aerogels starts with solution chemistry and may end with supercritical carbon dioxide drying, which both require a specialized system. Here we present a complete aerogel production system that was developed and used in our laboratory over the last nine years. Our aim was to develop a supercritical dryer and a protocol, whereby the CO2 pump can be left out, and the entire flow syst...

Air-starved combustion of biomass and fossil fuels releases aerosols, including airborne carbonaceous particles, causing negative climatic and health effects. Radiocarbon analysis of the elemental carbon (EC) fraction can help apportion sources of its emission, which is greatly constrained by the challenges in isolation of EC from organic compounds in atmospheric aerosols. The isolation of EC u...

Chemical Fluid Deposition (CFD) involves the chemical reduction of organometallic compounds in SCFs to yield high purity deposits.[4] Typically, the reaction is initiated upon the addition of H2 or other reducing agent. The advantages of CFD over conventional deposition techniques are a consequence of the unique properties of SCFs, which lie intermediate to those of liquids and gases. Supercrit...

Industrial scale injection of anthropogenic carbon dioxide into the crustal lithosphere has been proposed to reduce atmospheric accumulation. Much of this injection is expected to occur in saline reservoirs. An understanding of two-phase brine-CO2 flow is necessary for predicting storage capacity, fluid migration, and injectivity in geologic reservoirs. Additionally, the chemical reactivity of ...