Role of ionic surfactant in magnetic dynamics of self-assembled dispersions of nanoplatelets

TL;DR

This paper investigates how ionic surfactants influence the magnetic dynamics of self-assembled nanoplatelet dispersions, revealing new collective modes and tunable magnetic responses through electrostatic interaction adjustments.

Contribution

It demonstrates the control of magnetic response spectra in nanoplatelet dispersions by tuning electrostatic interactions with ionic surfactants, introducing new dynamic modes.

Findings

Tuning electrostatic interactions induces new magnetic modes.

Varying nanoplatelet to surfactant ratio affects collective dynamics.

Increased nanoplatelet concentration modifies magnetic response.

Abstract

In complex colloidal systems, interparticle interactions strongly affect the dynamics of the constituting particles. A study of the dynamical response also provides invaluable information on the character of those interactions. Here we demonstrate how tuning the electrostatic interactions by an ionic surfactant in dispersions of magnetic nanoplatelets leads to developing new dynamic modes in magnetic response spectra. The collective modes can be induced or suppressed by either varying the concentration ratio of the magnetic nanoplatelets (MP) to the surfactant or increasing the MP concentration reflecting the nanoscale characteristics of this fluid magnet.