https://doi.org/10.1140/epje/s10189-026-00558-y
Research – Soft Matter
Experimental Determination of the Dielectric Constant of Micellar Hydration Layer via Localized Surface Plasmon Resonance of Gold Nanoparticles
1
Physics Department, Ponta Grossa State University, Av. General Carlos Cavalcanti, 4748, 84030-900, Ponta Grossa, PR, Brazil
2
Physics Department, Federal University of Technology of Paraná, R. Doutor Washington Subtil Chueire, 330, 84017-220, Ponta Grossa, PR, Brazil
a
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Received:
27
September
2025
Accepted:
19
January
2026
Published online:
20
February
2026
Abstract
The localized surface plasmon resonance (LSPR) of plasmonic nanoparticles can be used both for measuring the dielectric constant in which they are dispersed and for determining changes in the structure of the medium around them. In this work, we explored the shift in the LSPR of gold nanoparticles (AuNPs), obtaining the out-of-plane dielectric constant of the hydration layer of nanoparticles dispersed in aqueous solutions of sodium dodecyl sulfate for concentrations below and above the critical micelle concentration. A reduction is observed, which is due to a soft confinement between the nanoparticle and the micelles. The confinement favors the in-plane alignment of the water’s molecular dipoles, hindering a rotation out-of-plane and reducing the tendency to align with an external electric field, i.e., diminishing the medium’s polarization.
Rozane F. Turchiello and Sergio L. Gómez have contributed equally to this work.
© The Author(s) 2026
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