Unexpected enormous efficiency increase of fluorinated CO2-microemulisons by the addtion of non-amphiphilic hydrophobic additives
Microemulsions containing supercritical CO2 have attracted much attention as novel environmental friendly solvents or as templates for nanoporous foams.However,using the Principle of Supercritical Microemulsion Expansion,the foams suffer from aging phenomena,resulting in pore sizes in the lower µm range.In order to suppress the aging of the pores an anti-aging concept was developed.Expanding supercritical microemulsions containing low-molecular hydrophobic molecules,these additives are supposed to accumulate at the blowing agent/matrix interface reducing the interfacial tensions and therewith the aging of the pores.Surprisingly,phase behavior studies showed that adding only small amounts of C6H12 improve the efficiency of fluorinated non-ionic surfactants by a factor of 2.Assuming a non-homogeneous distribution of CO2 and C6H12 in the sub-domains would explain this enormous effect.To investigate the role of C6H12 and its distribution in the scCO2/additive sub-domain we propose systematic contrast variation measurements on the system H2O/D2O/NaCl – CO2/C6H12/C6D12 – fluorinated non-ionic surfactant mixture the contrast can be adjusted by both the H2O/D2O and C6H12/C6D12-ratio.
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PUETZ Yvonne; GRASSBERGER Lena; LINDNER Peter; SCHWEINS Ralf and SOTTMANN Thomas. (2013). Unexpected enormous efficiency increase of fluorinated CO2-microemulisons by the addtion of non-amphiphilic hydrophobic additives. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1302
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