CO2 , supercritical

Fig. 1. Crack-free monolithic titania-silica aerogel photos, (a) aerogel prepared by hi -temperature ethanol supercritical drying, (b) aerogel prepared by low-temperature CO2 supercritical drying.

Gamlieli-Bonshtein, I. Korin, E. Cohen, S. 2002. Selective separation of cis-trans geometrical isomers of P-carotene via CO2 supercritical fluid extraction. Biotech. Bioeng. 80 169-174. 

The dynamic behaviour of the system h (nicotine salt and CO2 supercritical fluid) and the system c (system b plus entrainer molecules) is shown in Figs. 18a and 18b, respectively. It can be seen from these CG pictures that the malic salts of nicotine keeps its configuration even on interaction with the supercritical CO2 and the two hydrogen bonds remain stable during the simulation (Fig. 18a). On the contrary, the separation of nicotine from its malic counterparts develops in the presence of entrainer molecules and hydrogen bonds become finally broken (Fig. 18b). 

Assuming that the COj-naphthalene mixture obeys the Peng-Robinson equation of state with C02-n = 0.103, estimate the.solubility of naphthalene in the CO2 supercritical fluid (SCF). Also compute the predicted enhancement factors and the contribution of the Poynting factor to the enhancement factor. 

Thus, europium loaded gels were prepared. Some of them were dried by solvent evacuation at CO2 supercritical conditions to obtain the Eu-organic aerogeh After pyrolysis at 1050 °C a Eu-carbon aerogel was obtained (entries 2-4 of Table 5.7). The materials were tested as catalysts in Michael additions (Scheme 5.11). We performed the reaction of ethyl 2-oxocyclopentanecarboxylate and 3-buten-2-one... 

Buriti oil (BO) was mixed with PST or PMMA and the ensuing blends characterized in terms of absorption and photoluminescence properties associated with the specific structure of this oil extracted from an Amazonian palm tree [ 106]. Liu et al. reported very recently that SOYO can be homo-polymerized in CO2 supercritical conditions by cationic initiation with BFE without using a co-monomer [107]. 

El Rassy H, Buisson P, BouaU B, Perraid A, Pierre AC (2(X)3) Surface Characterization of Silica aerogels with Different Proportions of Hydrophobic Groups, dried by the CO2 Supercritical Method Langmuir, 19 358-363 Harreld JH, Ebina T, Tsubo N, Stucky G (2(X)2) Manipulation of pore size distributions in silica and ormosil gels dried under ambient pressure crmditions. J Non-Cryst Solids 298 241 251... 

CP co-precursor, OM organic modifier, S Silylotion, M methoxylation, abbreviations used in the Precursor column are defined in Table 3.1 abbreviations used in the Additional Reagent(s) Employed column and in foomotes, below, are defined in Table 3.2 AMB ambient pressure extraction, ASCE alcohol supercritical extraction, CSCE CO2 supercritical extraction, RSCE rapid supercritical extraction. The temperature indicated in the Hydrophobicity column indicates the maximum temperature at which the aerogels were hydrophobic. 

El Rassy, H, Buisson, P, Bouali, B, Perrard, A, Pierre, A C (2003) Surface characterization of silica aerogels with different proportions of hydrophobic groups, dried by the CO2 supercritical method. Langmuir 19(2) ... 

Suh D J, Park T J (2002) Synthesis of high-surface-area zirconia aerogels with a well-developed mesoporous texture using CO2 supercritical drying. Chem Mater 14 1452-1954... 

Tursiloadi S, Yamanaka Y, Hirashima H (2006) Thermal evolution of mesoporous titania prepared by CO2 supercritical extraction. J Sol-Gel Sci Technol 38 5-12... 

---