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1.
Superkritični CO2, čistejša alternativa tradicionalnim metodam procesiranja polimernih biomaterialov
Elena Markočič, Mojca Škerget, Željko Knez, 2009, review article

Keywords: superkritični CO2, polimerni biomateriali, polimerne pene, mikrodelci, kompozitni materiali
Published in DKUM: 19.04.2024; Views: 67; Downloads: 1
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Navodila za vaje iz prenosa snovi
Željko Knez, Mojca Škerget, Elena Markočič, 2010, other educational material

Keywords: kemijsko inženirstvo, prenos snovi
Published in DKUM: 31.05.2012; Views: 2529; Downloads: 76
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4.
Measurement of CO2 solubility and diffusivity in poly(L-lactide) and poly(D,L-lactide-co-glycolide) by magnetic suspension balance
Elena Markočič, Mojca Škerget, Željko Knez, 2008, original scientific article

Abstract: The solubility of supercritical carbon dioxide (scCO2) in poly(l-lactide) and poly(d,l-lactide-co-glycolide) at different temperatures (308, 313 and 323 K) and pressures (10-30 MPa) was measured using a magnetic suspension balance. The solubility data were also used for estimating the binary diffusion coefficients. The results show a good solubility of CO2 in both polymers: up to 43% in poly(l-lactide) and 30% in poly(d,l-lactide-co-glycolide). The diffusion coefficients have high values, which verify the liquid-like solvating properties of scCO2. The diffusion coefficient depends on the quantity of gas already absorbed by the polymer; its values decrease with increasing gas concentration.
Keywords: SC CO2, solubility, diffusivity, magnetic suspension balance
Published in DKUM: 31.05.2012; Views: 1789; Downloads: 103
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5.
Measurement and modeling of the CO2 solubility in poly(ethylene glycol) of different molecular weights
Elena Markočič, Mojca Škerget, Željko Knez, 2008, original scientific article

Abstract: The solubility of supercritical carbon dioxide (scCO2) in solid (298 K) and melted (323 K) poly(ethylene glycol) (PEG), in the pressure range (7 to 25) MPa, was measured using a magnetic suspension balance. The phase behavior of the CO2 + PEG system was modeled by using the Sanchez-Lacombe equation of state (EOS) and statistical associating fluid theory (SAFT). The results show a good solubility of CO2 in polymer and a good accuracy of the thermodynamic models in describing the phase equilibrium of the working system. The experimental data are also in good agreement with the solubility values previously described in the literature, obtained by employing different experimental techniques.
Keywords: polyetylene glycol, different molecular weights, carbon dioxide
Published in DKUM: 31.05.2012; Views: 1939; Downloads: 82
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