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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
Published on: April 19, 2018
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Shear-induced structural and thermodynamic phase transitions in micellar systems
Angelina Martín Del Campo1, J Paulo García-Sandoval2, J F Armando Soltero1
1Departamentos de Ingeniería Química y Física, Universidad de Guadalajara, Blvd. M. García Barragán 1451, 44430, Guadalajara, Jal., Mexico.
The European Physical Journal. E, Soft Matter
|February 26, 2017
Summary
This study presents a new method using rheological data to classify shear-induced phase transitions in surfactant/water mixtures. The Bautista-Manero-Puig model helps identify boundaries for structural changes in micellar systems.
Area of Science:
- * Colloid and Surface Science
- * Rheology and Materials Science
Background:
- * Understanding shear-induced structural and phase transitions in surfactant/water mixtures is crucial for material design.
- * Rheological measurements offer a powerful tool for probing these complex behaviors.
Purpose of the Study:
- * To develop and validate a methodology for computing and classifying shear-induced structural and phase transitions in surfactant/water systems.
- * To utilize the Bautista-Manero-Puig (BMP) model parameters to define transition boundaries.
- * To analyze the phase behavior of cetyltrimethylammonium tosylate (CTAT)/water and Pluronics P103/water systems.
Main Methods:
- * Non-linear rheological experiments were conducted at varying surfactant concentrations and temperatures.
- * The Bautista-Manero-Puig (BMP) model was fitted to shear stress versus shear rate data.
- * Analysis focused on identifying transition boundaries based on BMP model parameters.
Main Results:
- * CTAT/water mixtures exhibit a first-order phase transition at 30°C and 31-32 wt.% CTAT, shifting from isotropic to nematic phases.
- * Pluronics P103/water solutions show two second-order transitions (spherical to cylindrical micelles at 33.1°C, cylindrical to nematic at 35.8°C) and a first-order transition near 37.9°C.
- * The methodology successfully identified instability regions leading to shear banding due to wormlike micelle breakage.
Conclusions:
- * The proposed rheological methodology effectively classifies shear-induced structural and phase transitions in surfactant/water mixtures.
- * The Bautista-Manero-Puig (BMP) model parameters serve as reliable indicators of these transition boundaries.
- * This approach aids in understanding and predicting the complex phase behavior of micellar systems under shear.
Keywords:
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