Journal article

Colloidal fibers as structurant for worm-like micellar solutions

  • Zanchetta, Giuliano Department of Physics, University of Fribourg, Switzerland - Department of Medical Biotechnology and Translational Medicine, University of Milano, Italy
  • Mirzaagha, Shadi Department of Chemical, Materials and Industrial Production Engineering, Università degli Studi di Napoli Federico IINaples, Italy
  • Guida, Vincenzo Bruxelles Innovation Center, Procter & Gamble Co.Strombeek Bever, Belgium
  • Zonfrilli, Fabio Bruxelles Innovation Center, Procter & Gamble Co.Strombeek Bever, Belgium
  • Caggioni, Marco Microstructured Fluids Group, Procter & Gamble Co.West Chester, USA
  • Grizzuti, Nino Department of Chemical, Materials and Industrial Production Engineering, Università degli Studi di Napoli Federico IINaples, Italy
  • Pasquino, Rossana Department of Chemical, Materials and Industrial Production Engineering, Università degli Studi di Napoli Federico IINaples, Italy
  • Trappe, Véronique Department of Physics, University of Fribourg, Switzerland
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    01.08.2018
Published in:
  • Colloid and Polymer Science. - 2018, vol. 296, no. 8, p. 1379–1385
English 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.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/306866
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