New polyimide-polyoxometalate nanocomposite materials with nanoporous structure and ultra-low dielectric constant, formed in supercritical carbon dioxide

2012 ◽  
Author(s):  
Mukhamed Keshtov ◽  
Ernest Said-Galiev ◽  
Vitaliy Kochurov ◽  
Alexei Khokhlov
Keyword(s):  
Carbon Dioxide ◽  
Dielectric Constant ◽  
Supercritical Carbon Dioxide ◽  
Nanocomposite Materials ◽  
Nanoporous Structure ◽  
Low Dielectric Constant ◽  
Low Dielectric ◽  
Supercritical Carbon

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.

Low dielectric constant silica films with ordered nanoporous structure

2007 ◽  
Vol 27 (5-8) ◽  
pp. 1145-1148 ◽  
Author(s):  
Jun Shen ◽  
Aiyun Luo ◽  
Lanfang Yao ◽  
Xuejin Lin ◽  
Bin Zhou ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Nanoporous Structure ◽  
Low Dielectric Constant ◽  
Silica Films ◽  
Low Dielectric

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.

Evolution of the Nanoporous Structure of High-Density Polyethylene during Drawing in Supercritical Carbon Dioxide

2018 ◽  
Vol 51 (3) ◽  
pp. 1129-1140 ◽  
Author(s):  
Anna O. Dudnik ◽  
Elena S. Trofimchuk ◽  
Aleksandr V. Efimov ◽  
Nina I. Nikonorova ◽  
Ekaterina G. Rukhlya ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
High Density Polyethylene ◽  
High Density ◽  
Nanoporous Structure ◽  
Supercritical Carbon
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