Aggregation of new bipolar glucosyled and cationic fluoroamphiphiles in aqueous media

Aggregation Behavior and Total Miscibility of Fluorinated Ionic Liquids in Water

“…The critical packing parameter, P , is an important factor in understanding the self-aggregation process, shape of aggregates, for a surfactant. According to Israelachvili et al, the structure of the aggregate can be predicted from the packing parameter, defined as follows where V 0 is the effective volume occupied by hydrophobic chains in the aggregate core, considered to be an incompressible fluid, l c is the maximum effective length, also denoted as the critical chain length, and A min is taken as the effective headgroup surface area occupied by the hydrophilic group at the aggregate/solution interface. ,,, With the increment in P values, the structure of aggregates can be spherical when P ≤ 0.33, cylindrical when P ≤ 0.5, lamellar when P ≤ 1, or inverted when P > 1. In this work, this parameter has been used with the aim of obtaining the structure of the transition ascertained by surface tension in the [EtMeIm]­[(PFBu)­SO 3 ] aqueous system and predicts the possible mechanism of this phase transition.…”

“…The interest in these novel FILs is that these combine the best properties of fluorocarbon compounds with those of ionic liquids. The potential biological applications of fluorocarbon compounds present a handicap because their aqueous solubility (water and biological fluids) is commonly too low . The increment of aqueous solubility could open new frontiers in applications of fluorinated ionic liquids; for example, they could be used to solubilize some proteins and enzymes .…”

“…The potential biological applications of fluorocarbon compounds present a handicap because their aqueous solubility (water and biological fluids) is commonly too low. 11 The increment of aqueous solubility could open new frontiers in applications of fluorinated ionic liquids; for example, they could be used to solubilize some proteins 12 and enzymes. 13 Ionic liquids based on bis(trifluoromethylsulfonyl)imide, hexafluorophosphate, or tetrafluoroborate anions have been frequently characterized and designated as fluorinated ionic liquids.…”

Synthesis and properties of quaternary ammonium surfactants containing a methoxy benzyl substitute

“…According to the literature, 23 the hydrophobic interaction could be reinforced between the molecules with the increase of chain length, attributed to an enhancement of the hydrophobic character, which favors the orderly assembly of the surfactants at the interface, resulting in a decreasing of the A min values. Whereas, the average area per molecule (A min ) of m-MDRA-n increased in our study, and the saturated adsorption (G max ) decreased with increasing the length of hydrophobic carbon chain from 12 up to 18.…”

Solubilization and release of fragrance agents in the aqueous solution of CO2 switchable surfactants

“…All dynamic light scattering (DLS) measurements were performed on a Particulate Systems (Micromeritics, Norcross, GA, USA, Nano Plus-3) at a 90 scattering angle. The obtained scattering data were fitted using an intensity-weighted cumulative analysis to estimate the diffusion coefficient of the emulsions formed by the N-alkylimidazolium bicarbonate solutions with or without fragrance agents (Ngo et al, 2013). The average diameter D a determined from the diffusion coefficient through the Stokes-Einstein Equation and the polydispersity index (PDI) of the particles in the solutions were obtained.…”