Anomalous Viscoelasticity of Concentrated Solutions with a Fluorinated Hybrid Surfactant

Abstract

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.

Synthesis and Solution Properties of Sulfate-Type Hybrid Surfactants with an Ethylene Spacer

“…FmPHnS are expected to be a good emulsifier for making aqueous fluorocarbon paints because they are able to emulsify fluorocarbon/water/hydrocarbon systems (6). The present authors have also reported that the synthesized hybrid surfactants form long-life micelles detected by NMR (7) and abnormally highly viscous solutions at about 10 wt% and 36 (8)(9)(10)(11)(12), and have a human tooth reformability for the prevention of its decay (13). These properties are characteristic of the hybrid surfactants and cannot be developed by mixed systems of fluorocarbon and hydrocarbon surfactants.…”

“…We have reported a peculiar viscosity behavior of highly concentrated aqueous solutions of the hybrid surfactants (8)(9)(10)(11)(12). Figure 6 shows typical photographs of 1, 5, 10, and 20 wt% solutions of F8EH3OS at 25 .…”

Phase behavior and preparation of mesoporous silica in aqueous mixtures of fluorinated surfactant and hydrophobic fluorinated polymer

“…This behavior has been found in solutions of worm-like micelles when longchain oils are solubilized, and it is attributed to a rod-sphere transition [2,42]. As a matter of fact, worm-like micelles have been reported in several fluorinated surfactant systems [43][44][45][46][47][48], although they are not common in binary nonionic surfactantwater systems.…”

Unique liquid crystal behavior in water of anionic fluorocarbon–hydrocarbon hybrid surfactants containing oxyethylene units

“…Most ionic fluorocarbon-hydrocarbon hybrid surfactants reported previously employed a stimuli-insensitive group (e.g., n-alkyl) as one of the hybrid-structured tails [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41], although only two ionic hybrid surfactants had a stimuli-sensitive group; one had a redox-responsive ferrocene group at the terminal end of nalkyl tail [42]. Then, there is no information on the interfacial properties and liquid crystal behavior for an ionic hybrid surfactant having temperature-sensitive oxyethylene units in one hybridstructured alkyl tail.…”