Existence of Time-Dependence for Interfacial Tension of Solutions

Ward, A. F. H.; Tordai, L.

doi:10.1038/154146b0

Cited by 22 publications

(8 citation statements)

References 4 publications

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“…Note the local depletion of diblock copolymer near the A/B interface with the concomitant diblock copolymer adsorption peak, a result reminiscent of the classical Ward-Todai analysis of surfactant adsorption dynamics. 12 In Figure 7c after 1.7 h, this same trend continues, but now an adsorption peak appears at the second hPB90/hPB63 interface. Clearly, the diblock copolymer diffuses through the hPB63 layer crossing the first interface to arrive at the second interface.…”

Section: Resultssupporting

confidence: 52%

“…After 0.2 h, the diblock copolymer surfactant has diffused from the upper hPB90 layer and adsorbed at the first hPB90/hPB63 interface. Note the local depletion of diblock copolymer near the A/B interface with the concomitant diblock copolymer adsorption peak, a result reminiscent of the classical Ward−Todai analysis of surfactant adsorption dynamics …”

Section: Resultsmentioning

confidence: 85%

“…There have been numerous experimental and theoretical investigations into the dynamics of surfactant adsorption and desorption. − These studies are motivated, in part, by the technological importance of surfactant-stabilized materials such as emulsions, drug delivery systems, foams, and paints. Surfactant transport to interfaces is typically described by diffusion to the interface, coupled with the kinetics of adsorption, although more sophisticated models have been proposed .…”

Section: Introductionmentioning

confidence: 99%

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Diblock Copolymer Surfactant Transport across the Interface between Two Homopolymers

et al. 2006

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Dynamics of adsorption and desorption of a diblock copolymer to an interface between two homopolymers was measured using dynamic secondary-ion mass spectrometry (SIMS). Thin films were constructed consisting of a layer of saturated polybutadiene with 90% 1,2-addition (sPB90), followed by a layer of saturated polybutadiene with 63% 1,2-addition (sPB63), and finally by another layer of the sPB90 homopolymer. A sPB90-sPB63 diblock copolymer was initially included only in the top sPB90 layer of the film at a volume fraction of 0.05. The thin films were annealed at ambient temperature for times ranging between 0.2 and 108 h, and the concentration profiles of the diblock copolymer through the films were measured using SIMS. The dynamics of adsorption and desorption of the diblock copolymer at the two sPB90-sPB63 interfaces was gauged by comparing the different transient concentration profiles. The sorption process was modeled as diffusion in an external field, generated from self-consistent field theory (SCFT). All parameters for the model were determined independently. Although the model neglects the dynamics of conformational change, experimental results matched theory very well.

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Section: Resultssupporting

confidence: 52%

Section: Resultsmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Diblock Copolymer Surfactant Transport across the Interface between Two Homopolymers

et al. 2006

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“…The existence of a semi-soluble pellicle in some solutions and a concomitant time effect in attaining final static surface tension (7,12) could also be explained by a similar hypothesis, where the autocatalytic process refers to association or crystallization rather than denaturation. A slow attainment of a static value for interfacial tensions has been reported recently (21) and may also be due to a similar cause.…”

Section: Order Of the Reaction At The Surfacesupporting

confidence: 60%

The Change of Surface Tension with Time. II. The Surface Tension of Saponin Solutions

Ross¹

1945

J. Phys. Chem.

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“…Fluid-fluid interfaces were first addressed in the 1940's by Alexander 19 and Ward and Tordai. 20 The tension of an interface of a fluid to a surfactant solution is determined by its coverage with surfactant molecules. When the solution is saturated and in equilibrium with the interface, the surface coverage is referred to as complete.…”

Section: Introductionmentioning

confidence: 99%

Dynamic interface tension of a smectic liquid crystal in anionic surfactant solutions

Harth

Shepherd

Honaker

et al. 2015

Phys. Chem. Chem. Phys.

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The interface tension of a smectic liquid crystal with respect to a surrounding ionic surfactant solution is investigated at concentrations above and below the critical micelle concentration (cmc). A simple measurement technique has been developed recently [Phys. Chem. Chem. Phys., 2013, 15, 7204], based on the geometrical analysis of the shape of smectic bubbles in water that are deformed by the buoyancy of trapped air bubbles. After preparation of the smectic membranes in the solution, we measure both the time dependence of their dynamic interface tension as well as the asymptotically reached static tension values. These are established about 15 minutes after the membrane preparation. At large enough concentrations of the surfactant (above the critical micelle concentration), the interface tension drops to 6 mN m(-1). At the lowest possible surfactant concentrations in our experiment, the equilibrium tension reaches 20 mN m(-1), which is almost equal to the smectic surface tension respective to air. The tension of a freshly drawn film exceeds this value by far.

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Existence of Time-Dependence for Interfacial Tension of Solutions

Cited by 22 publications

References 4 publications

Diblock Copolymer Surfactant Transport across the Interface between Two Homopolymers

Diblock Copolymer Surfactant Transport across the Interface between Two Homopolymers

The Change of Surface Tension with Time. II. The Surface Tension of Saponin Solutions

Dynamic interface tension of a smectic liquid crystal in anionic surfactant solutions

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