Behavior of wormlike micellar solutions formed without any additives from semi-fluorinated quaternary ammonium salts
作者:Gennifer Padoan、Elisabeth Taffin de Givenchy、Alessandro Zaggia、Sonia Amigoni、Thierry Darmanin、Lino Conte、Frédéric Guittard
DOI:10.1039/c3sm51591e
日期:——
of the obtained surfactants were characterized by DLS, zeta potential, viscosity, and Cryo-SEM. The surfactants with a long fluorinated chain form long and highly flexible aggregates that lead to highly viscous solutions and the formation of an entangled network made of flexible worm-like micelles. The viscoelastic properties of the surfactants that form hydrogels without any additives were characterized
Amine N-oxides represented by the formula:
wherein
Rf is C3-C20 perfluoroalkyl;
R is H or alkanoyl containing 1-4 carbons;
R' and R2 are the same or different
C1-C6 alkyl or C1-C6 hydroxyalkyl, or together with the N atom to which they are bonded form a piperidine, morpholine or N-alkyl (C1-C4) piperazine ring; or
R' is C1-C6 alkyl or C1-C8 hydroxyalkyl
R3 is C1-C6 alkyl or C1-C6 hydroxyalkyl; and n is an integer from 1-8;
and mixtures thereof.
The amine N-oxides are highly effective in reducing the surface tension of aqueous systems and as aqueous foaming agents. They are prepared by oxidizing the amine represented by the formula:
Amphiphilic perfluoroalkylated sulfones and sulfonate betaines
作者:Robert Kaplánek、Oldřich Paleta
DOI:10.1016/j.jfluchem.2007.02.011
日期:2007.7
overall yields of two-step syntheses were above 90%. The compounds 7–9 were prepared by the reaction of oxiranes 1–3 with 2-sulfanylethan-l-ol and subsequent oxidation of intermediate sulfides. Similarly, the amphiphiles 13–15 were obtained by analogous reaction of oxiranes 1–3 with thiomorpholine and subsequent oxidation of the sulfur atom in the morpholine ring. In the syntheses of betaines 23–32, the
两种类型的全氟烷基的含两亲砜的7 - 9和13 - 15,分别和磺酸盐甜菜碱23 - 32使用2制备- [(全氟烷基)甲基]环氧乙烷(1-3,R ˚F = C 4 ˚F 9, C 6 F 13,C 8 F 17)或3-(全氟烷基)丙基碘(16和17,R F = C 6 F 13,C 8 F 17)作为起始化合物。两步合成的总产率高于90%。化合物7 – 9是由[oxiranes] 1 – 3与2-sulfanylethan-1-ol反应并随后氧化中间体硫化物而制备的。类似地,两亲物13 - 15通过环氧乙烷的类似反应得到13与硫代吗啉和在吗啉环中的硫原子的后续氧化。在甜菜碱23 – 32的合成中,起始化合物1 – 3或16和17 首先使它们与二甲胺反应,然后使中间氟烷基(二甲基)胺与丙烷-1,3-或丁烷-1,4-内酯进行开环反应。
Characterization of air/water interface adsorption of a series of partially fluorinated/hydrogenated quaternary ammonium salts
The adsorption at air/water interface of a series of partially fluorinated/hydrogenated quaternary ammonium salts was characterized by the determination of static and dynamic surface tension, critical micelle concentration, surface excess, area per molecule and Krafft temperature. In particular, the variation of these parameters was studied as a function of fluorinated and hydrogenated chain length