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Preparation and Characterization of SDF-1α-Chitosan-Dextran Sulfate Nanoparticles

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Published on: January 22, 2015

Molecular mobility in solid sodium dodecyl sulfate.

S Mitra¹, V K Sharma, V Garcia Sakai

¹Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India.

The Journal of Physical Chemistry. B

|July 21, 2011

Summary

Solid sodium dodecyl sulfate (SDS) exhibits molecular mobility starting below 210 K, with dynamics evolving until a transition at 360 K. Above this, localized translational diffusion occurs, similar to SDS micelle behavior.

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Area of Science:

Materials Science
Physical Chemistry
Condensed Matter Physics

Background:

Sodium dodecyl sulfate (SDS) is a widely used surfactant.
Understanding molecular dynamics in solid-state surfactants is crucial for various applications.

Purpose of the Study:

To investigate the molecular mobility in solid sodium dodecyl sulfate (SDS) using high-resolution neutron scattering.
To identify temperature-dependent dynamical transitions and characterize the nature of molecular motion.

Main Methods:

High-resolution neutron scattering (quasielastic neutron scattering - QENS and fixed energy window - FEW).
Differential scanning calorimetry (DSC) for corroboration.
Analysis of molecular motion including reorientational and translational diffusion.

Main Results:

Dynamical motion in solid SDS is present from at least 210 K, evolving monotonically until a transition at 360 K.
Below 360 K, fractional reorientational motion occurs, progressing from the tail to the head of the SDS molecule, indicating gradual melting.
Above 360 K, localized translational diffusion of the hydrocarbon chain is observed, mirroring dynamics in SDS micelles.

Conclusions:

A significant dynamical transition occurs in solid SDS at 360 K.
The molecular mobility transitions from reorientational to translational diffusion with increasing temperature.
The high-temperature behavior of solid SDS resembles monomer dynamics in SDS micelles.