A Novel Design Of Water- And Oil-Repellent Surface Modifier Having Double-Fluoroalkyl Groups

Synthesis and Monolayer Behaviors of Succinic Acid-Type Gemini Surfactants Containing Semifluoroalkyl Groups

“…3, Γ CMC values were determined, and are listed in Table 3. With respect to the occupied minimum area A G , the values for the 1 1 type F4C10 was 0.43 nm 2 , which was consistent with the values obtained from π-A measurements of various semifluoroalkanoic acids on water 28 . However, the A G values of the 1) Values at the 1st break point.…”

A Novel Synthesis of SO3H Type Gemini Surfactant Having Semifluoroalkyl Group as Hydrophobic Group

“…3, Γ cmc values of 11a-c and 12a were determined using 4 5 points just below cmc and listed in Table 9. With respect to the occupied minimum area A, the values for 1 1 type 11a-c were 0.36 nm 2 C 4 F 9 to 0.4 nm 2 C 8 F 17 , which was consistent with the values obtained from π-A measurements of semifl uoroalkanoic acid on water 26 . The A value of 12a 0.70 nm 2 was smaller than twice the A values of 1 1 type 11a-c, which would indicate that two hydrophobic chains of Gemini 12a can align more close at the air/ water interface than monomeric surfactant.…”

Novel Fluorinated Gemini Surfactants with γ-Butyrolactone Segments

“…The value of ν used in this study was 2, because the concentration of TBAH was not high and the volume of tetrabutylammonium counter ions adsorbed at the air/water interface would be large. In our previous work 20 , A G values for Rf-CH 2 n -COOK Rf C 4 F 9 , C 6 F 13 , C 8 F 17 ; n 3-10 were in the range 0.35-0.45 nm 2 per molecule. Contrary to our expectations, all the A G values for 15 were twice as large as those for Rf-CH 2 n -COOK; this may be because of the large volume of tetrabutylammonium counter ions at the air/water interface.…”

“…The residue was treated in a similar manner to that described above. The residue was recrystallized from diethyl ether to give 1 s 2 2.36 g, yield 20 . Dimethyl 1,1-cyclopropanedicarboxylate was obtained from the filtrate in 60 yield.…”

“…On acidification, the precipitated solid showed a C O stretching peak at 1687 cm 1 chart C , but no lactone peak, which means that simple acidification did not cause recyclization to the lactone. The surface properties, i.e., CMC, effectiveness of surface tension reduction γ CMC , efficiency of surface tension reduction pC 20 : negative logarithm of the surfactant concentration required to reduce the surface tension of the solvent, i.e., water by 20 mN/ m 18 , maximum surface excess concentration G CMC , and the Gibbs occupied minimum area A G of the fluoroalkylated lactone surfactants were therefore investigated at 25 in aqueous TBAH solution.…”