Study on the applicability of dynamic light scattering (DLS) to microemulsions including supercritical carbon dioxide-swollen micelles

Journal article
(Original article)


Publication Details

Author(s): Cadogan S, Hahn CJ, Rausch MH, Fröba AP
Journal: Journal of Colloid and Interface Science
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Publication year: 2017
Volume: 499
Pages range: 202-208
ISSN: 0021-9797
Language: English


Abstract


The applicability of dynamic light scattering (DLS) for the characterization of the size of supercritical carbon dioxide (sc-CO2)-swollen micelles in a polyester polyol-based multicomponent microemulsion with non-ionic surfactant has been thoroughly proved for the first time in this work. Systematic experiments confirming that a hydrodynamic mode is observable in either a homodyne or a heterodyne detection scheme as well as the evaluation of the influence of the laser power applied to the slightly colored microemulsion have ensured an accurate implementation of this technique for a technically relevant system. The correlation times associated with the translational diffusion coefficient of the swollen micelles in a continuous liquid phase were measured for temperatures from (298.15 to 338.15) K at pressures of (90 and 100) bar. While there was no significant effect of pressure, it was found that the translational diffusion coefficient increases with increasing temperature as expected. We postulate this is primarily related to the effect of decreasing viscosity of the continuous phase. An estimation of the hydrodynamic diameter of the sc-CO2-swollen micelles is in good agreement with values for similar systems reported in the literature. For the derivation of absolute sizes for corresponding systems, also dynamic viscosity and refractive index data will be determined simultaneously in a currently developed closed experimental loop. (C) 2017 Elsevier Inc. All rights reserved.



FAU Authors / FAU Editors

Cadogan, Shane
Erlangen Graduate School in Advanced Optical Technologies
Fröba, Andreas Paul Prof. Dr.-Ing.
Lehrstuhl für Advanced Optical Technologies - Thermophysical Properties
Rausch, Michael Heinrich Dr.-Ing.
Lehrstuhl für Advanced Optical Technologies - Thermophysical Properties


External institutions
Covestro Deutschland AG


How to cite

APA:
Cadogan, S., Hahn, C.J., Rausch, M.H., & Fröba, A.P. (2017). Study on the applicability of dynamic light scattering (DLS) to microemulsions including supercritical carbon dioxide-swollen micelles. Journal of Colloid and Interface Science, 499, 202-208. https://dx.doi.org/10.1016/j.jcis.2017.03.111

MLA:
Cadogan, Shane, et al. "Study on the applicability of dynamic light scattering (DLS) to microemulsions including supercritical carbon dioxide-swollen micelles." Journal of Colloid and Interface Science 499 (2017): 202-208.

BibTeX: 

Last updated on 2018-14-07 at 03:23