Colloidal fibers as structurant for worm-like micellar solutions

Abstract

We investigate the rheological properties of a simplified version of a liquid detergent composed of an aqueous solution of the Linear Alkylbenzene Sulphonate (LAS) surfactant, in which a small amount of fibers made of Hydrogenated Castor Oil (HCO) is dispersed. At the concentration typically used in detergents, LAS is in a worm-like micellar phase exhibiting a Maxwellian behavior. The presence of HCO fibers provides elastic properties, such that the system behaves as a simple Zener body, mechanically characterized by a parallel connection of a spring and a Maxwell element. Despite this apparent independence of the contributions of the fibers and the surfactant medium to the mechanical characteristics of the system, we find that the low frequency modulus increases with increasing LAS concentration. This indicates that LAS induces attractive interactions among the HCO fibers, resulting in the formation of a stress-bearing structure that withstands shear at HCO concentrations, where the HCO fibers in the absence of attractive interactions would not sufficiently overlap to provide stress-bearing properties to the system.

Yield stress “in a flash”: investigation of nonlinearity and yielding in soft materials with an optofluidic microrheometer

“…The origin and conditions of such a transition display several open issues, like the stress distribution within the material or the role of microstructural dynamics in determining slow creep rearrangements before yielding 2 . The possibility to switch from a solid to a fluid behaviour is also at the basis of the widespread application of yield stress fluids in personal care products 5,6 , in particular for their ability to suspend and trap density-mismatched particles, either lighter or heavier See DOI: 10.1039/cXsm00000x/ than the matrix, which would otherwise cream or sediment 7,8 . The threshold condition for stable trapping in a yield stress fluid 9 can be expressed in terms of the ratio between the bulk σ y and the total gravitational stress of the particle 1,10 :…”