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Materials 2015, 8(6), 3754-3766; doi:10.3390/ma8063754

Revealing New Structural Insights from Surfactant Micelles through DLS, Microrheology and Raman Spectroscopy

1
Malvern Instruments, 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA
2
Chemical and Biomolecular Engineering, University of Delaware, 150 Academy St., Newark, DE 19716, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Jaroslaw W. Drelich
Received: 12 May 2015 / Revised: 3 June 2015 / Accepted: 15 June 2015 / Published: 19 June 2015
(This article belongs to the Section Structure Analysis and Characterization)
View Full-Text   |   Download PDF [1193 KB, uploaded 19 June 2015]   |  

Abstract

The correlation between molecular changes and microstructural evolution of rheological properties has been demonstrated for the first time in a mixed anionic/zwitterionic surfactant-based wormlike micellar system. Utilizing a novel combination of DLS-microrheology and Raman Spectroscopy, the effect of electrostatic screening on these properties of anionic (SLES) and zwitterionic (CapB) surfactant mixtures was studied by modulating the NaCl concentration. As Raman Spectroscopy delivers information about the molecular structure and DLS-microrheology characterizes viscoelastic properties, the combination of data delivered allows for a deeper understanding of the molecular changes underlying the viscoelastic ones. The high frequency viscoelastic response obtained through DLS-microrheology has shown the persistence of the Maxwell fluid response for low viscosity solutions at high NaCl concentrations. The intensity of the Raman band at 170 cm1 exhibits very strong correlation with the viscosity variation. As this Raman band is assigned to hydrogen bonding, its variation with NaCl concentration additionally indicates differences in water structuring due to potential microstructural differences at low and high NaCl concentrations. The microstructural differences at low and high NaCl concentrations are further corroborated by persistence of a slow mode at the higher NaCl concentrations as seen through DLS measurements. The study illustrates the utility of the combined DLS, DLS-optical microrheology and Raman Spectroscopy in providing new molecular structural insights into the self-assembly process in complex fluids. View Full-Text
Keywords: wormlike micelles; microrheology; DLS; Raman Spectroscopy; branching; viscoelasticity wormlike micelles; microrheology; DLS; Raman Spectroscopy; branching; viscoelasticity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Amin, S.; Blake, S.; Kennel, R.C.; Lewis, E.N. Revealing New Structural Insights from Surfactant Micelles through DLS, Microrheology and Raman Spectroscopy. Materials 2015, 8, 3754-3766.

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