The Determination of Interfacial Tension by Video Image Processing of Pendant Fluid Drops.

Anastasiadis, S. H.; Chen, J. K.; Koberstein, Jeffrey T.; Siegel, A. F.; Sohn, J. E.

doi:10.21236/ada165745

Cited by 16 publications

(19 citation statements)

References 4 publications

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“…The interfacial tension is measured by the ring method ͑Surface Tensiomat, Model 21, Cole-Parmer͒ and the pendant drop method. 19 Both methods are calibrated by measuring the surface tension of distilled water at room temperature, and the results agree closely with the standard value ͑72 dyn/ cm at 20°C͒.…”

Section: B Materialsmentioning

confidence: 53%

“…19,28 Figure 8 compares the results for a water drop in decane ͑M7͒ and a water drop in a very dilute PIB solution, made by adding 0.1 ml of M10 into roughly 120 ml of M7, resulting in a PIB concentration around 5 ppm. In both cases, the initial value of Ϸ 50 dyn/ cm agrees very well with the published value in the absence of a surfactant.…”

Section: B Non-newtonian Liquidsmentioning

confidence: 99%

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An experimental study of the coalescence between a drop and an interface in Newtonian and polymeric liquids

2006

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When a water drop falls onto an oil-water interface, the drop usually rests for some time before merging with the water underneath the interface. We report experiments on this process using waterand oil-based Newtonian liquids and polymer solutions, with an emphasis on the non-Newtonian effects. We deduce that the drop surface is immobilized by contaminants pre-existing in the fluids, and find that the rest time scales with the matrix viscosity for Newtonian fluids. The results are compared with lubrication models for film drainage. If the surrounding matrix is a dilute polymer solution, the rest time is identical to that for a matrix of the solvent alone. Further investigation indicates that the polymer molecules have been cleared from the film by surface adsorption. Depending on the fluid properties and drop size, the drop-interface merging may be completed in one shot or through a cascade of partial coalescence. Partial coalescence occurs for an intermediate range of drop sizes; it is arrested by viscosity for smaller drops and by gravity for larger ones. When either the drop or the matrix phase is a polymer solution, viscoelasticity is shown to suppress partial coalescence for smaller drops. This is apparently due to the inhibition of capillary pinch-off which would otherwise produce a secondary drop before the merging is complete.

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Section: B Materialsmentioning

confidence: 53%

Section: B Non-newtonian Liquidsmentioning

confidence: 99%

An experimental study of the coalescence between a drop and an interface in Newtonian and polymeric liquids

2006

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“…The surface tension of small volumes was measured using a homemade pendant drop tensiometer which analysis is based on the application of the Young−Laplace equation to the drop profile. 26 In this technique, a surfactant solution drop is created at the end of a straight cut tiny Teflon tube, which has an internal diameter of 0.8 mm and an external diameter of 1.58 mm. The image of the drop is recorded using a webcam (640 × 480 pixels) and corrected for spherical aberration.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Chiral Cyclobutane β-Amino Acid-Based Amphiphiles: Influence of Cis/Trans Stereochemistry on Solution Self-Aggregation and Recognition

2015

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Novel diastereomeric anionic amphiphiles based on the rigid cyclobutane β-amino acid scaffold have been synthesized and deeply investigated with the aim of generating new functional supramolecular architectures on the basis of the rational design of original amphiphilic molecules and the control of their self-assembly. The main interest has been focused on the effect that cis/trans stereochemistry exerts on their molecular organization and recognition. In diluted solutions, the relative stereochemistry mainly influences the headgroup solvation and anionic-charge stabilization, i.e., better stabilized in the cis diastereoisomer due to intramolecular hydrogen-bonding and/or charge-dipole interactions. This provokes differences in their physicochemical behavior (pKa, cmc, conductivity) as well as in the structural parameters of the spherical micelles formed. Although both diastereoisomers form fibers that evolve with time from the spherical micelles, they display markedly different morphology and kinetics of formation. In the lyotropic liquid crystal domain, the greatest differences are observed at the highest concentrations and can be ascribed to different hydrogen-bonding and molecular packing imposed by the stereochemical constraints. Remarkably, the spherical micelles of the two anionic surfactants show dramatically diverse enantioselection ability for bilirubin enantiomers. In addition, both the surfactants form heteroaggregates with bilirubin at submicellar concentrations but with a different expression of supramolecular chirality. This points out that the unlike relative configuration of the two surfactants influences their chiral recognition ability as well as the fashion in which chirality is expressed at the supramolecular level by controlling the molecular organization in both micellar aggregates and surfactant/bilirubin heteroaggregates. All these differential features can be appropriate and useful for the design and development of new soft materials with predictable and tunable properties and reveal the cyclobutane motif as a valuable scaffold for the preparation of new amphiphiles.

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“…This was also observed for some of the copolymers discussed. Surface tension measurements using drop profiles are typically based on pendant or sessile drops [Roe et al, 1967;Wu, 1969;Anastasiadis et al, 1987;Bhatia et al, 1988;Cheng and Neumann, 1992;Fleischer et al, 1994;Lin et al, 1995;Song and Springer, 1996]. New developments utilize digital image-processing techniques for extracting the entire drop profile and subsequent calculation of the surface tension coefficient, γ, based on the Laplace equation of capillarity [Song and Springer, 1996;Luciani et al, 1997;Demarquette and Kamal, 1998;Kwok et al, 1998;Menke et al, 2000;Morita et al, 2002].…”

Section: Preliminariesmentioning

confidence: 99%

Bulk and Surface Properties of Random Copolymers in View of the Simha–Somcynsky Equation of State

Kammer

Kreßler

2010

Polymer Physics

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The Determination of Interfacial Tension by Video Image Processing of Pendant Fluid Drops.

Cited by 16 publications

References 4 publications

An experimental study of the coalescence between a drop and an interface in Newtonian and polymeric liquids

An experimental study of the coalescence between a drop and an interface in Newtonian and polymeric liquids

Chiral Cyclobutane β-Amino Acid-Based Amphiphiles: Influence of Cis/Trans Stereochemistry on Solution Self-Aggregation and Recognition

Bulk and Surface Properties of Random Copolymers in View of the Simha–Somcynsky Equation of State

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