A lyotropic ferrocolloid (ferronematic) based on a potassium laurate/1-decanole/water ternary solution

TL;DR

This paper reports the synthesis and characterization of a lyotropic ferrocolloid (ferronematic) based on a potassium laurate/1-decanol/water system, highlighting its phase behavior and magnetic properties.

Contribution

It introduces a novel ferronematic formed from a cationic ferrofluid and a specific ternary solution, with detailed phase diagrams and magnetic property measurements.

Findings

Existence of a nematic phase in the mixture.

Magnetic properties depend on particle concentration and pH.

Stable suspension of magnetic particles within the nematic phase.

Abstract

A lyotropic ferrocolloid is synthesized by mixing of a cationic ferrofluid and potassium laurate/1-decanol/water ternary solution. Conditions of existence of a nematic phase in this mixture, other mesophases, and their phase diagrams in the vicinity of the nematic one are obtained and characterized quantitatively. Inside of the nematic zone the lyotropic ferrocolloid becomes a ferronematic, i.e., a liquid crystal with remarkably strong magnetic properties. We found that the pH and the component concentrations dramatically affect the amount of magnetic particles stably suspended in a lyotropic carrier. Magnetization and magnetic susceptibility of synthesized ferronematics are measured depending on the concentration of dispersed magnetic particles.