On the ionizing properties of supercritical carbon dioxide: uncatalyzed electrophilic bromination of aromatics

RSC Advances ◽  
2014 ◽  
Vol 4 (92) ◽  
pp. 51016-51021 ◽  
Author(s):  
Thais Delgado-Abad ◽  
Jaime Martínez-Ferrer ◽  
Javier Reig-López ◽  
Rossella Mello ◽  
Rafael Acerete ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Dielectric Constant ◽  
Supercritical Carbon Dioxide ◽  
Polar Solvent ◽  
Electrophilic Bromination ◽  
Supercritical Carbon

scCO2, a non-polar solvent with a dielectric constant lower than n-pentane, promotes the electrophilic bromination of aromatics as efficiently as strongly ionizing solvents such as aqueous acetic and trifluoroacetic acids.

Repair of Porous Methylsilsesquioxane Films using Supercritical Carbon Dioxide

2004 ◽  
Vol 812 ◽  
Author(s):  
Bo Xie ◽  
Anthony J. Muscat
Keyword(s):  
Carbon Dioxide ◽  
Dielectric Constant ◽  
Fourier Transform ◽  
Supercritical Carbon Dioxide ◽  
Ftir Spectroscopy ◽  
Oxygen Plasma ◽  
Contact Angles ◽  
Silanol Groups ◽  
Chain Lengths ◽  
Supercritical Carbon

AbstractPorous methylsilsesquioxane (p-MSQ) films (JSR LKD 5109) were treated with alkyldimethylmonochlorosilanes having chain lengths of one, four, and eight carbon atoms dissolved in supercritical carbon dioxide at 150-300 atm and 50-60°C to repair oxygen ashing damage. Fourier transform infrared (FTIR) spectroscopy showed that trimethylchlorosilane (TMCS), butyldimethylchlorosilane (BDMCS), and octyldimethylchlorosilane (ODMCS) reacted with silanol groups on the surfaces of the pores producing covalent Si-O-Si bonds. Selfcondensation between alkylsilanols produced a residue on the surface, which was partially removed using a pure scCO2 rinse. The hydrophobicity of the blanket p-MSQ surface was recovered after silylation treatment as shown by contact angles >85°. The initial dielectric constant of 2.4 ± 0.1 increased to 3.5 ± 0.1 after oxygen plasma ashing and was reduced to 2.6 ± 0.1 by TMCS, 2.8 ± 0.1 by BDMCS, and 3.2 by ODMCS.

scholarly journals Extraction of citrus flavonoids from peel of Citrus junos using supercritical carbon dioxide with polar solvent

2014 ◽  
Vol 39 (3) ◽  
pp. 309-311
Author(s):  
Munehiro Hoshino ◽  
Takuya Suetsugu ◽  
Hideo Iwai ◽  
Arata Takamizu ◽  
Masahiro Tanaka ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Polar Solvent ◽  
Citrus Flavonoids ◽  
Citrus Junos ◽  
Supercritical Carbon

scholarly journals Extraction of Citrus Flavonoids from Peel of Citrus Junos Using Supercritical Carbon Dioxide with Polar Solvent

2013 ◽  
Vol 1 (4) ◽  
pp. 87-90 ◽  
Author(s):  
Takuya Suetsugu ◽  
Hideo Iwai ◽  
Masahiro Tanaka ◽  
Munehiro Hoshino ◽  
Armando Quitain ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Polar Solvent ◽  
Citrus Flavonoids ◽  
Citrus Junos ◽  
Supercritical Carbon

scholarly journals Supercritical carbon dioxide extraction of porogens for the preparation of ultralow-dielectric-constant films

2003 ◽  
Vol 82 (24) ◽  
pp. 4328-4330 ◽  
Author(s):  
T. Rajagopalan ◽  
B. Lahlouh ◽  
J. A. Lubguban ◽  
N. Biswas ◽  
S. Gangopadhyay ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Dielectric Constant ◽  
Supercritical Carbon Dioxide ◽  
Supercritical Carbon Dioxide Extraction ◽  
Carbon Dioxide Extraction ◽  
Supercritical Carbon

Lowering the dielectric constant of polyimide thin films by swelling with supercritical carbon dioxide

2013 ◽  
Vol 24 (7) ◽  
pp. 615-622 ◽  
Author(s):  
Inga A. Ronova ◽  
Maria Bruma ◽  
Alexander A. Kuznetsov ◽  
Alexander Yu. Nikolaev
Keyword(s):  
Thin Films ◽  
Carbon Dioxide ◽  
Dielectric Constant ◽  
Supercritical Carbon Dioxide ◽  
Supercritical Carbon
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