Foamability of sodium dodecyl sulfate solutions: Anomalous effect of dodecanol unexplained by conventional theories

Abstract

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. • Antifoam efficacy of DOH and decreased bubble surface potential explain the decreased foamability of pre-CMC SDS-DOH solutions.• Complex effect of surfactant mixtures on foamability is demonstrated.4 AbstractConventional theories indicate that surfactant solutions with low surface tension, fast adsorption kinetics, and high interfacial viscoelasticity increase foamability. These theories are applicable to single surfactants of pre-CMC. Here, we examine whether these theories are applicable for surfactant mixtures. Specifically, we investigated the foamability of sodium dodecyl sulfate (SDS)-dodecanol (DOH) solutions. We found that the foamability of SDS-DOH solutions exhibited 'anomalies' that were unexplained by conventional theories. The remarkable decrease in the foamability of SDS solutions caused by the addition of DOH could not be easily explained by the theories of surface tension and surface viscoelasticity.Instead, we proposed alternative mechanisms to resolve these unexpected results. Below the DOH solubility limit, the replacement of SDS molecules by DOH molecules at the air-water interface results in a reduced surface potential, leading to a lower foamability. The antifoam effects of DOH droplets can account for the reduced foamability above this limit. This paper highlights the complex effect of surfactant mixtures on foamability.

Improved CO2 Capture Performance of Electrochemically Mediated Amine Regeneration Processes with Ionic Surfactant Additives

“…This is especially important for operation of the cell on a large scale, since the absorption column previously developed for the EMAR process can still be employed in the presence of surfactants, with no required modification in terms of size or configuration, avoiding additional capital costs. The only concern associated with the use of surfactants in the absorption column would be foaming, which can be easily handled by using very low concentrations of a cost-effective anti-foaming agent (also known as defoamer) such as polydimethyl­siloxane. , For the investigated concentrations of the surfactants (1 m m ), no significant foaming was observed. In addition, the total CO 2 capacity of the solution was not affected by the surfactants, as indicated by achievement of the same CO 2 loadings with and without surfactant present (Figure A, inset).…”

“…The only concern associated with the use of surfactants in the absorption column would be foaming, which can be easily handled by using very low concentrations of a cost-effective anti-foaming agent (also known as defoamer) such as polydimethylsiloxane. 31,32 For the investigated concentrations of the surfactants (1 mm), no significant foaming was observed. In addition, the total CO 2 capacity of the solution was not affected by the surfactants, as indicated by achievement of the same CO 2 loadings with and without surfactant present (Figure 3A, inset).…”

Application of foam dyeing technology on ultra-fine polyamide filament fabrics with acid dye

“…Because adding these stabilizers could strengthen the surface viscoelasticity and weaken the fluidity of the foam film, the time of foam rupture becomes longer. 19,20 The reasons for the t 1/2 decrease of the guar gum foam need further research. However, the foam volume was decreased when dodecanol, CMC-Na, sodium alginate and guar gum were used as stabilizers (see Figure 2(b)).…”

Morphology, Rheology, and Kinetics of Nanosilica Stabilized Gelled Foam Fluid for Hydraulic Fracturing Application

“…However, the foam decay process was very slow. The decay rate of the foam bubbles was determined using the second order of kinetics decay model given in eq . , …”

“…The decay rate of the foam bubbles was determined using the second order of kinetics decay model given in eq 1. 41,42 The foam collapse process is analogous to a second order decomposition reaction…”