Effects of fluoroalkyl chain length and added moles of oxyethylene on aggregate formation of branched-tail fluorinated anionic surfactants

Citation
M. Sagisaka et al., Effects of fluoroalkyl chain length and added moles of oxyethylene on aggregate formation of branched-tail fluorinated anionic surfactants, COLL SURF A, 183, 2001, pp. 749-755
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
ISSN journal
0927-7757 → ACNP
Volume
183
Year of publication
2001
Pages
749 - 755
Database
ISI
SICI code
0927-7757(20010715)183:<749:EOFCLA>2.0.ZU;2-I
Abstract
The effects of fluorocarbon chain length and oxyethylene chain length were examined on the aggregate formation of newly synthesized double chain-type fluorinated anionic surfactants. The solution properties of double chain-ty pe fluorinated anionic surfactants with two moles of added oxyethylene (nFS (EO)(2)) were found to depend on the fluorocarbon chain length. Thus, the K rafft temperature rose abruptly as the length of fluorocarbon chain increas ed, while the concentration at which the lowest surface tension is attained or aggregates are formed lowered with increasing chain length. In contrast , for double chain-type fluorinated anionic surfactants with two more moles of added oxyethylene (nFS(EO)(4)) their solution properties were almost in affected by fluorocarbon chain length. That is, almost no change was seen i n the concentration that indicates the lowest surface tension or aggregate formation when the chain length was altered, whereas the Krafft temperature was below 0 degreesC for ah members, providing them with a high solubility in water. In addition, spontaneous vesicle formation was observed in solut ion of nFS(EO)(4) and the size distribution of the vesicles thus formed had plural peaks (discrete size distribution). (C) 2001 Published by Elsevier Science B.V. All rights reserved.