RUS  ENG
Полная версия
ЖУРНАЛЫ // Наносистемы: физика, химия, математика // Архив

Наносистемы: физика, химия, математика, 2017, том 8, выпуск 6, страницы 732–739 (Mi nano98)

Эта публикация цитируется в 8 статьях

PHYSICS

Viscoelastic properties of new mixed wormlike micelles formed by a fatty acid salt and alkylpyridinium surfactant

A. V. Shibaev, O. E. Philippova

Department of Physics, Lomonosov Moscow State University, Leninskie Gory, 1, bld. 2, Moscow, 119991, Russia

Аннотация: We propose a new combination of an anionic (potassium oleate) and cationic (n-octylpyridinium chloride) surfactants that are able to self- assemble into long cylindrical (wormlike) mixed micelles in water. The solutions have strong viscoelastic properties with viscosity up to 300 Pa$\cdot$s and elastic modulus around 20 Pa, which are attributed to the formation of an entangled micellar network. We discover that with an increase in the molar ratio of cationic to anionic surfactant, the solutions first increase drastically their viscosity and elasticity due to the growth of micelles in length and formation of the network, but then the rheological parameters slightly decrease, possibly due to micellar branching or shortening. The addition of cationic surfactant also induces the increase of difference between scission energy and micellar electrostatic energy, which is explained both by stronger binding of surfactants within the micelle and decrease of the micellar net charge.

Ключевые слова: surfactant, self-assembly, wormlike micelles, rheology, viscoelastic properties.

PACS: 36.20.Ey 47.57.Qk 66.20.Ej 82.70.Gg 83.60.Bc

Поступила в редакцию: 14.11.2017
Исправленный вариант: 18.11.2017

Язык публикации: английский

DOI: 10.17586/2220-8054-2017-8-6-732-739



Реферативные базы данных:


© МИАН, 2024