Phase and rheological behavior of the hexadecyl(trimethyl)azanium; 2-hydroxybenzoate/water system

Alfaro, Javier A.; Landázuri, Gabriel; González-Álvarez, Alejandro; Macías, E.R.; Fernández, V. V. A.; Schulz, Pablo C.; Rodrı́guez, José Luis; Soltero, J. F. A.

doi:10.1016/j.jcis.2010.07.038

Cited by 8 publications

(5 citation statements)

References 55 publications

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“…Single-phase samples above T k and below R C were transparent and isotropic when viewed through crossed polarizers, but they showed streaming birefringence that increased in intensity when R increased, and decreased as temperature was raised. This behavior is similar to that demonstrated by wormlike micellar solutions of single-tail cationic surfactants with aromatic hydrotropes, e.g., cetyltrimethylammonium tosylate (CTAT/water) system [10], cetyltrimethylammonium salicylate (CTAS/water) [31], but the shear birefringence intensity for solutions with the same concentration are much lower for SDS/AHC/ water than CTAT/water and CTAS/water systems. On the other hand, visual apparent viscosity changes of the solutions were detected by a tube-inversion test.…”

Section: Resultssupporting

confidence: 78%

The Effect of Aniline Hydrochloride Hydrotrope on the Phase Behavior of SDS/Water System

Huerta-Marcial

Landázuri

Macías-Balleza

et al. 2017

J Surfact & Detergents

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The aim of this work was to determine the detailed phase behavior of the sodium dodecyl sulfate/ aniline hydrochloride/water system as a function of concentration of sodium dodecyl sulfate (SDS), aniline hydrochloride (AHC) to sodium dodecyl sulfate molar ratio (R = [AHC]/[SDS]) and temperature. Phase behavior information was obtained via polarizing microscopy, differential scanning calorimetry (DSC), cryo-scanning electron microscopy (Cryo-SEM) and oscillatory linear rheological measurements with good agreement among these techniques. It is well known that SDS in water forms spherical micelles at concentrations lower than 40 wt% and temperatures above its Krafft temperature (T k = 16-21°C). In this region, the SDS/water system exhibits Newtonian rheological behavior, which is characteristic of spherical micellar solutions. The addition of the hydrotrope, aniline hydrochloride, to SDS aqueous solutions produces a viscosity increase in this system as R augments, and a maximum of about five orders of magnitude was found at R = 0.47 for 5 wt% SDS at 20°C. Moreover, the system shows a transition from viscous to strong viscoelastic behavior. These changes in the rheological behavior are produced by the transitions from sphere to rodlike micelles, which are induced by the hydrophobicity of AHC causing it to be absorbed into the core and the hydrophilic interface of the micelles, which screens the repulsions between the charged head groups.

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Section: Resultssupporting

confidence: 78%

The Effect of Aniline Hydrochloride Hydrotrope on the Phase Behavior of SDS/Water System

Huerta-Marcial

Landázuri

Macías-Balleza

et al. 2017

J Surfact & Detergents

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“…It is worth to mention that the plateau regime has been previously observed in many different systems ,− and explained by the presence of heterogeneities in the flowing sample. The presence of the stress plateau has also been attributed to different origins in the literature, such as orientation phenomena, water release in the specific shear band, or local concentration fluctuations in initially inhomogeneous structured organization of the molecules. − The origin of this phenomenon in calf-thymus DNA solutions was previously presented by Boukany et al as a localized “collapse” of the entangled network in response to the fast shear and by Hu et al as a possible nematic ordering.…”

Section: Results and Discussionmentioning

confidence: 67%

Supramolecular Organization in Calf-Thymus DNA Solutions under Flow in Dependence with DNA Concentration

et al. 2017

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DNA dynamics and flow properties are of great importance for understanding its functions. DNA is a semiflexible polymer chain characterized by having a large persistence length of around 50 nm and high charge density; DNA chains are interacting efficiently at high concentrations, in dependence of the ionic concentration. In relation with DNA molecular characteristics, it is also known that DNA solutions are able to form liquid crystalline phases over a critical polymer concentration. In this work, the supramolecular organization in calf-thymus DNA solution, with low degree of entanglement, appearing under flow was studied in a wide DNA concentration range from 2 to 10 mg/mL, at a pH of 7.3 and 20 °C. The rheological behavior of the system was studied using steady state flow and oscillatory measurements. Transient regimes were also tested by imposing controlled shear rates on a short time up to steady state. Furthermore, a combination of visual observations and flow birefringence measurements was proposed to reach a better understanding of the obtained rheological behavior. The presence of a shear-induced texture is revealed under flow for the calf-thymus DNA solutions at C DNA> 5 mg/mL and attributed to organized domains of DNA molecules, named in the text as crystalline parts, which are progressively oriented under shear. Finally, at high shear rates (over 100 s–1), it is shown that for the DNA solutions the orientation of these organized DNA domains and connecting chains under flow goes to an anisotropic monodomain.

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“…This suggests that the 3FB − counterion is more hydrophobic than the 4FB − one. Evidently, the counterion characteristics are important in determining the critical surfactant concentration at which the shear thickening transition appears: it is only 0.016 wt.% for CTAS [36], 0.02 wt.% for CTAVB [14], 0.05-0.07 wt.% for CTAT [37,38], and 0.6 and 0.7 wt.% for CTA3FB for CTA4FB solutions, respectively, that suggests that hydrophobicity of these counterions increases in the order:…”

Section: Resultsmentioning

confidence: 99%

On the shear thickening behavior of micellar aqueous solutions of cetyltrimethylammonium fluorobenzoates: Effect of the fluor position

Landázuri

Macías

Fernández³

et al. 2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Phase and rheological behavior of the hexadecyl(trimethyl)azanium; 2-hydroxybenzoate/water system

Cited by 8 publications

References 55 publications

The Effect of Aniline Hydrochloride Hydrotrope on the Phase Behavior of SDS/Water System

The Effect of Aniline Hydrochloride Hydrotrope on the Phase Behavior of SDS/Water System

Supramolecular Organization in Calf-Thymus DNA Solutions under Flow in Dependence with DNA Concentration

On the shear thickening behavior of micellar aqueous solutions of cetyltrimethylammonium fluorobenzoates: Effect of the fluor position

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