We have recently found that sodium 1-oxo-1-[4-(tridecafluorohexyl)phenyl]-2-hexanesulfonate (FC6-HC4), one of the synthesized hybrid surfactants that have both fluorocarbon chain and hydrocarbon chain
in the molecule, exhibits a thermoresponsive viscoelastic behavior in aqueous solution. The aim of this
study is to examine the viscosity behavior in solution of synthesized surfactants with different chemical
structures (different lengths of fluorocarbon and hydrocarbon chains) as a function of temperature and
to analyze the data obtained by using a theory of probability. The study reveals the importance of the
chemical structure in which the numbers of carbon atoms are 6 and 4 in the fluorocarbon and hydrocarbon
chains, respectively, for the hybrid surfactant to show the thermoresponsive viscoelastic behavior. This
behavior is also found to be observed during the process where the size of assemblies of surfactant molecules
decreases with rising temperature and when the probability of collision is highest between small and large
molecular assemblies.
The thermal viscosity behavior or temperature-dependent viscosity
of an aqueous solution of sodium
1-oxo-1-[4-(tridecafluorohexyl)phenyl]-2-hexanesulfonate
(FC6-HC4), a fluoro-hybrid type surfactant, which
has a fluorocarbon chain and a hydrocarbon chain in a molecule, was
examined. The FC6-HC4 solution
showed viscoelastic behavior at concentrations around 10 wt %.
Further study on the temperature
dependence of the viscosity of a 10 wt % solution revealed that the
viscosity increased about 102 times,
showing a maximum as temperature rose from 6 to 36 °C, and then
decreased about 10-4 times with
further
rising at in temperatures up to 64 °C. Moreover, tan δ, a
parameter for viscoelasticity, exhibited a minimum
at 36 °C. The phenomenon found in this work was reversible with
respect to temperature change. In other
words, an aqueous solution of FC6-HC4 was found to show
thermoresponsive viscoelastic behavior.
Flow (rheological) properties and dynamic
viscoelasticity of concentrated solutions of a hybrid
surfactant
containing a fluorocarbon chain and hydrocarbon chain within a single
molecule were analyzed. The
results indicated that the viscosity of the hybrid surfactant solution
is not proportional to the increase in
its concentration, and it showed an anomalously large value around a 10
wt % solution. It was also
indicated that the surfactant solution in this range of concentration
behaves like a viscoelastic substance
with a characteristic of rubber like elasticity.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.