Pendent Drops at Elevated P &amp; T

Georgiadis, Apostolos; Maitland, Geoffrey C.; Trusler, Martin; Kazarian, Sergei G.; Bismarck, Alexander

doi:10.1038/npre.2008.2636

Cited by 1 publication

(3 citation statements)

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“…Figure6compares the effect of pressure on g for PDMS13-b-POEGMA46 at either 40 or 80°C. In the absence of polymer, the pressure dependence of g is similar for the two temperatures although g increases slightly when the temperature increases, as already observed in the litterature 32. On the contrary, there was a drastic difference between these two temperatures in the presence of PDMS13-b-POEGMA46.…”

supporting

confidence: 76%

“…In fact, γ decreases almost linearly but slightly with pressure (Figure 6); which is explained by the decrease of the density difference between water and scCO2. 11,32 The results show that an increase of P induces a slight decrease of γ both with and without polymer (Table 3).…”

Section: Considering the Conversion And Percentage Of Pdms-mentioning

confidence: 90%

“…The γ value of 24 mN/m obtained without polymer (Table 2) was in accordance with the values in the literature under the same conditions of T and P after an equilibration time of few minutes. 32 Moreover, the results presented in Table 2 show that the PDMS13-b-POEGMAx decrease γ below 5 mN/m with polymer concentrations ranging from 0.1 to 1 % w/v in water. (all values can be found in Table S2).…”

Section: Considering the Conversion And Percentage Of Pdms-mentioning

confidence: 96%

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Synthesis of PDMS-b-POEGMA Diblock Copolymers and Their Application for the Thermoresponsive Stabilization of Water-Supercritical Carbon Dioxide Emulsions

et al. 2020

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In this study, PDMS13-b-POEGMAx diblock copolymers consisting of a CO2-philic poly(dimethylsiloxane) (PDMS) block connected to a thermosensitive hydrophilic poly(oligoethylene glycol methacrylate) (POEGMA) block, were synthetized by reversible addition-fragmentation chain-transfer (RAFT) radical polymerization. Their ability to decrease the water-supercritical CO2 (scCO2) interfacial tension (g) and to stabilize water-scCO2 emulsions was investigated using an original home-made device developed in the laboratory. This device is able to control the pressure from 1 to 250 bar and the temperature from 40 to 80°C. It was implemented with 2 visualization windows, a drop tensiometer and a remote optical head for dynamic light scattering (DLS) measurements. These experiments revealed that PDMS-b-POEGMA decreased g down to 1-2 mN/m and was the most efficient at high pressure (250 bar) and low temperature (40°C) where PDMS and POEGMA blocks exhibited the highest affinity for their respective phase. The diblock copolymers were shown to stabilize water-scCO2 emulsions.Moreover, the thermosensitive behavior of the POEGMA block in water (with a lower critical solubility temperature around 65°C) resulted in the formation of temperature-responsive emulsions that could reversibly switch at 100 bar from stable at 40°C to unstable at 80°C. These results were rationalized based on the solubility of each individual block of the copolymers in water and scCO2 as a function of temperature and pressure.

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supporting

confidence: 76%

Section: Considering the Conversion And Percentage Of Pdms-mentioning

confidence: 90%

Section: Considering the Conversion And Percentage Of Pdms-mentioning

confidence: 96%

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