Effects of functional groups on the solubilities of polyhedral oligomeric silsesquioxanes (POSS) in supercritical carbon dioxide

Date

2015-07-01

Author

Kanya, Basak
Dilek Hacıhabiboğlu, Çerağ

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

113
views

0
downloads

The phase behavior of the binary systems containing CO2 and various hybrid polyhedral oligomeric silsesquioxanes (PUSS) with different functional groups were investigated. A high-pressure view cell was used to measure the dew-points or cloud-points at temperatures between 308 and 323 K, up to 30 MPa. Among the studied PUSS structures, methacryl, isooctyl and octaisobutyl PUSS were observed to form homogenous solutions with CO2, while octamethyl PUSS was found to be insoluble in the supercritical fluid. The solubilities of both methacryl and isooctyl PUSS in scCO(2) decrease with increasing temperature, while isooctyl PUSS exhibits nearly an order of magnitude higher solubility than methacryl PUSS at both temperatures. The octaisobutyl PUSS-CO2 binary system exhibits a crossover pressure, below which the solubility of the component decreases with increasing temperature. Above this pressure, as the temperature is increased, the solubility of PUSS in scCO(2) increases. These results show that the functional groups of PUSS affect its solubility in scCO(2) and the phase behavior of the PUSS-CO2 binary system significantly. The scCO(2)-soluble PUSS can be implemented in environmentally benign material processing applications using the supercritical fluid.

Subject Keywords

Crossover pressure, Binary system, Organic-inorganic hybrid materials, Silica cage, CO2-philic

URI

https://hdl.handle.net/11511/42497

Journal

JOURNAL OF SUPERCRITICAL FLUIDS

DOI

https://doi.org/10.1016/j.supflu.2015.03.024

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Effects of functional groups on the solubilities of polyhedraloligomeric silsesquioxanes (poss) in supercritical carbon dioxide Kanya, Başak; Dilek Hacıhabiboğlu, Çerağ; Department of Chemical Engineering (2015) In this study, the phase behavior of the binary systems containing CO2 and various hybrid polyhedral oligomeric silsesquioxanes (POSS) with different functional groups were investigated. A high-pressure view cell was used to measure the dew-points or cloud-points at temperatures between 308K and 323K, up to 30 MPa. Among the studied POSS structures, methacryl, isooctyl and octaisobutyl POSS were observed to form homogenous solutions with CO2, while octamethyl POSS was found to be insoluble in the supercriti...
Effect of calcium oxide addition on carbothermic formation of hexagonal boron nitride Özkenter, Ali Arda; Sevinç, Naci; Department of Metallurgical and Materials Engineering (2009) Hexagonal boron nitride (h-BN) formation by carbothermic reduction of B2O3 under nitrogen atmosphere at 1500°C and effect of CaO addition into the initial B2O3 – active C mixture were investigated during this study. Reaction products were characterized by powder X-ray diffraction, scanning electron microscopy (SEM) and quantitative chemical analysis. Main aim of this study was to investigate the presence of a second reaction mechanism that catalytically affects h-BN formation during CaO or CaCO3 addition in...
Effects of silica nanoparticles on the performance of water-based drilling fluids Kök, Mustafa Verşan; Bal, Berk (2019-09-01) In this research, two groups of experiments were conducted to investigate the effects of silica (SiO2) nanoparticles on the filtration and rheological properties of water-based drilling fluids. In the first group, bentonite, chrome-free lignosulfonate (CFL) and carboxymethyl cellulose (CMC) were used in different concentrations to obtain base fluids. Nanofluids were prepared by adding 0.5 g of four different silica nanoparticles into these drilling fluids. Comparison of rheological properties, fluid loss am...
Effect of gamma irradiation on structure and electrical properties of (Bi,Pb)(2)Sr2Ca2Cu3O10 superconductor Albiss, BA; Ozkan, H; Bocuk, H; Hasanlı, Nızamı; Ercan, I (1997-01-01) Specimens of pure and Pb-doped high-T-c superconductors Bi2Sr2Ca2Cu3O10 (BSCCO) were irradiated with gamma-rays up to an integrated dose of about 225 MR. The variations of normal state resistance, transition temperature, critical current and lattice parameters with gamma-irradiation were studied. The normal state resistance increases with increase of gamma-dose at zero applied magnetic field, whereas the transition temperature and the critical current decrease with the same gamma-dose. The intensities of th...
Effects of reactor geometry on dissociating CO2 and electrode degradation in a MHCD plasma reactor Taylan, Onur; Pinero, Daniel; Berberoğlu, Halil (2018-08-01) This paper reports an experimental study on the effects of reactor geometry for dissociating carbon dioxide using a microhollow cathode discharge (MHCD) reactor, and the associated electrode degradation. A MHCD reactor consists of two hollow metal electrodes that are separated by dielectric material. The geometric reactor parameters studied were the dielectric material thickness and the diameter of the reactor hole. Dielectric thicknesses of 150, 300 and 450 mu m and discharge hole diameters of 200, 400 and...

Citation Formats

B. Kanya and Ç. Dilek Hacıhabiboğlu, “Effects of functional groups on the solubilities of polyhedral oligomeric silsesquioxanes (POSS) in supercritical carbon dioxide,” JOURNAL OF SUPERCRITICAL FLUIDS, pp. 17–23, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42497.