Impact of carbon dioxide on the surface tension of 1-hexanol aqueous solutions

Firooz, Abdolhamid; Chen, P.

doi:10.1016/j.colsurfa.2011.10.017

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…The CMC of the pure SDS aqueous solution under CO 2 is slightly lower than the value under air, because the ionization of CO 2 dissolved in water generates bicarbonate and hydrogen ions, which slightly weaken the air/water surface tension. [19,20] There is no dramatic change in the surface tension because the dodecylsulfate anion is not sufficiently basic to be protonated in carbonated water. With the combination of CO 2 and DMEA, however, the presence of the organic salt and the consequent increase in the ionic strength cause the CMC value of SDS to decrease sharply ( Figure 1).…”

Section: Resultsmentioning

confidence: 99%

A Conventional Surfactant Becomes CO₂‐Responsive in the Presence of Switchable Water Additives

Robert

Mercer

et al. 2013

Chemistry A European J

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We have developed a new benign means of reversibly breaking emulsions and latexes by using "switchable water", an aqueous solution of switchable ionic strength. The conventional surfactant sodium dodecyl sulfate (SDS) is not normally stimuli-responsive when CO2 is used as the stimulus but becomes CO2 -responsive or "switchable" in the presence of a switchable water additive. In particular, changes in the air/water surface tension and oil/water interfacial tension can be triggered by addition and removal of CO2 . A switchable water additive, N,N-dimethylethanolamine (DMEA), was found to be an effective and efficient additive for the reversible reduction of interfacial tension and can lower the tension of the dodecane/water interface in the presence of SDS surfactant to ultra-low values at very low additive concentrations. Switchable water was successfully used to reversibly break an emulsion containing SDS as surfactant, and dodecane as organic liquid. Also, the addition of CO2 and switchable water can result in aggregation of polystyrene (PS) latexes; the later removal of CO2 neutralizes the DMEA and decreases the ionic strength allowing for the aggregated PS latex to be redispersed and recovered in its original state.

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Section: Resultsmentioning

confidence: 99%

A Conventional Surfactant Becomes CO₂‐Responsive in the Presence of Switchable Water Additives

Robert

Mercer

et al. 2013

Chemistry A European J

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“…It was proven that neutral oligochitosan could not change the surface tension and CMC values. The CMC of the pure SDS aqueous solution in the presence of CO 2 was marginally lower than the value under air because the ionization of the oligochitosan by the CO 2 dissolved in the water produced carbamate ions, which decreased the surface tension [21,22]. However, the combination of CO 2 and oligochitosan ensured the appearance of the organic salt and consequently enhanced the ionic strength, resulting in a decrease in the CMC of SDS (Figure 2).…”

Section: Resultsmentioning

confidence: 99%

Reversible Stability of Emulsion and Polymer Latex Controlled by Oligochitosan and CO2

Guo

Xiao

et al. 2018

Polymers

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The addition of salt to a colloid solution ensures that emulsions can be easily separated into two phases and that polymer latexes can be coagulated. The switchable stability of emulsions and polymer latexes would improve the properties for their current applications. A switchable process of salt addition can be achieved using CO2 and switchable water, and it is a novel, benign approach to achieving a switchable ionic strength in an aqueous solution. However, the problem associated with switchable water is that its additives are all synthetic tertiary amines, most of which are harmful to human beings and the environment. Oligochitosan, as a natural product, can also be used as a switchable water additive. In this paper, a new switchable water system using oligochitosan to change the ionic strength was explored for use in several potential industrial applications. The conductivity of the aqueous solution of oligochitosan (0.2 wt.%) was switched from 0.2 to 331 μS/cm through the addition and removal of CO2. Oligochitosan and CO2 were successfully utilized to reversibly break a crude oil emulsion. Polystyrene (PS) latexes could also be reversibly destabilized; the zeta potential of the PS latex changed between −5.8 and −45.2 mV in the absence and presence of CO2 after oligochitosan was dissolved in the PS latex. The use of oligochitosan is a more environmentally friendly means for reversibly separating colloid solutions.

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Surface tension and adsorption kinetics of amphiphiles in aqueous solutions: The role of carbon chain length and temperature

Firooz¹,

Chen²

2012

Journal of Colloid and Interface Science

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Impact of carbon dioxide on the surface tension of 1-hexanol aqueous solutions

Cited by 4 publications

References 24 publications

A Conventional Surfactant Becomes CO₂‐Responsive in the Presence of Switchable Water Additives

A Conventional Surfactant Becomes CO₂‐Responsive in the Presence of Switchable Water Additives

Reversible Stability of Emulsion and Polymer Latex Controlled by Oligochitosan and CO2

Surface tension and adsorption kinetics of amphiphiles in aqueous solutions: The role of carbon chain length and temperature

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Impact of carbon dioxide on the surface tension of 1-hexanol aqueous solutions

Cited by 4 publications

References 24 publications

A Conventional Surfactant Becomes CO2‐Responsive in the Presence of Switchable Water Additives

A Conventional Surfactant Becomes CO2‐Responsive in the Presence of Switchable Water Additives

Reversible Stability of Emulsion and Polymer Latex Controlled by Oligochitosan and CO2

Surface tension and adsorption kinetics of amphiphiles in aqueous solutions: The role of carbon chain length and temperature

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Product

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A Conventional Surfactant Becomes CO₂‐Responsive in the Presence of Switchable Water Additives

A Conventional Surfactant Becomes CO₂‐Responsive in the Presence of Switchable Water Additives