Perfluoroalkylated poly(oxyethylene) thiols: Synthesis, adsorption dynamics and surface activity at the air/water interface, and bubble stabilization behaviour
摘要:
We report the synthesis of four new perfluoroalkylated thiols, CnF2n+1(CH2)(2)(OCH2CH2)(y)SH (FnH2(OE)(y) with n = 4 and 6; y = 4 and 6, that have a hydrophilic poly(oxyethylene) (POE) segment inserted between the hydrophobic fluorinated chain and the thiol functional group. The dynamics of adsorption and surface activity of these compounds at the air/water interface were studied using bubble profile analysis tensiometry. The adsorption kinetics profiles show that all compounds diffuse rapidly to the air/water interface and decrease the interfacial tension of water to values ranging from 16.5 to 31.6 mN m(-1), which qualifies them as potential components of microbubble shells. Their ability to self-assemble and stabilize gaseous microbubbles in the presence or absence of a fluorocarbon gas (perfluorohexane) was investigated by optical microscopy. Three out of the four compounds (the two F6 derivatives and F4H2(OE)(6)) were able to form and stabilize microbubbles. Microbubbles based on both F6 PEG thiols are more stable than those based on the F4 derivative. The number of oxyethylene (OE) groups substantially influences bubble stability; the higher the number of OEs, the more stable the microbubbles. Finally, the most important stabilising effect was obtained by introducing an internal fluorocarbon gas, whose presence in the bubble increases bubble stability from 6 h to 5 days for the most promising candidate, F6H2(OE)(6)SH. (C) 2014 Elsevier B.V. All rights reserved.
Perfluoroalkylated poly(oxyethylene) thiols: Synthesis, adsorption dynamics and surface activity at the air/water interface, and bubble stabilization behaviour
摘要:
We report the synthesis of four new perfluoroalkylated thiols, CnF2n+1(CH2)(2)(OCH2CH2)(y)SH (FnH2(OE)(y) with n = 4 and 6; y = 4 and 6, that have a hydrophilic poly(oxyethylene) (POE) segment inserted between the hydrophobic fluorinated chain and the thiol functional group. The dynamics of adsorption and surface activity of these compounds at the air/water interface were studied using bubble profile analysis tensiometry. The adsorption kinetics profiles show that all compounds diffuse rapidly to the air/water interface and decrease the interfacial tension of water to values ranging from 16.5 to 31.6 mN m(-1), which qualifies them as potential components of microbubble shells. Their ability to self-assemble and stabilize gaseous microbubbles in the presence or absence of a fluorocarbon gas (perfluorohexane) was investigated by optical microscopy. Three out of the four compounds (the two F6 derivatives and F4H2(OE)(6)) were able to form and stabilize microbubbles. Microbubbles based on both F6 PEG thiols are more stable than those based on the F4 derivative. The number of oxyethylene (OE) groups substantially influences bubble stability; the higher the number of OEs, the more stable the microbubbles. Finally, the most important stabilising effect was obtained by introducing an internal fluorocarbon gas, whose presence in the bubble increases bubble stability from 6 h to 5 days for the most promising candidate, F6H2(OE)(6)SH. (C) 2014 Elsevier B.V. All rights reserved.
Compositions of fluorocarbon nanoemulsion, and methods of preparation and use thereof
申请人:NuvOx Pharma LLC
公开号:US11304899B2
公开(公告)日:2022-04-19
The invention provides novel compositions of fluorocarbon nanoemulsions comprising one or more of fluorosurfactants and phospholipids, and methods of preparation and use thereof for enhanced oxygen delivery.
COMPOSITIONS OF FLUOROCARBON NANOEMULSION, AND METHODS OF PREPARATION AND USE THEREOF
申请人:NuvOx Pharma LLC
公开号:US20220401364A1
公开(公告)日:2022-12-22
The invention provides novel compositions of fluorocarbon nanoemulsions comprising one or more of fluorosurfactants and phospholipids, and methods of preparation and use thereof for enhanced oxygen delivery.