Surface tension of solutions of pure sodium dodecyl sulfate

Mysels, Karol J.

doi:10.1021/la00070a008

Cited by 261 publications

(228 citation statements)

References 5 publications

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“…16 Although GigSavino del Vecchio (Rome, Italy), in collaboration with Oslio's model can more readily explain the observed bisignate trow and Mukerjee, presented rapid, simple procedures to CD spectra, Mukerjee remarked that conclusions derived obtain preparations of the high purity required for physicofrom studies of crystals and large fibrous aggregates may chemical studies. successively passing a submicellar aqueous solution through J. Donald Ostrow (Chicago, IL) noted that the hepatocytic activated charcoal, 66 octadecylsilane silica, 67 and a chelating uptake of cholephilic organic anions (e.g., UCB) in a variety resin. Removal of surface-active impurities may be as good of experimental systems shows a saturable relationship to as the foam fractionation method, 67 but the yields of 65% to the concentration of unbound UCB (Bf), 51 whether serum 75% are clearly superior.…”

Section: Purification Of Bile Salts and Ucbmentioning

confidence: 99%

“…successively passing a submicellar aqueous solution through J. Donald Ostrow (Chicago, IL) noted that the hepatocytic activated charcoal, 66 octadecylsilane silica, 67 and a chelating uptake of cholephilic organic anions (e.g., UCB) in a variety resin. Removal of surface-active impurities may be as good of experimental systems shows a saturable relationship to as the foam fractionation method, 67 but the yields of 65% to the concentration of unbound UCB (Bf), 51 whether serum 75% are clearly superior. This new method is also more effecalbumin is present or not.…”

Section: Purification Of Bile Salts and Ucbmentioning

confidence: 99%

See 1 more Smart Citation

New concepts in bilirubin and jaundice: Report of the Third International Bilirubin Workshop, April 6-8, 1995, Trieste, Italy

Tiribelli

Ostrow

1996

Hepatology

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only partial and temporary relief of hyperbilirubinemia; tocytic transporters of UCB and related organic anions extracorporeal liver assist devices have had some sucwere described. Special emphasis was given to the adencess in initial human studies; and inhibition of heme osine triphosphate (ATP)-dependent canalicular multioxygenase (HO) with metalloporphyrins, especially tin specific organic anion transporter that is defective in mesoporphyrin, which markedly decreases bilirubin production for prolonged periods, is a new alternative dipyrrole (Fig. 1). In solution, however, this structure is flexi- Received October 3, 1995; accepted June 6, 1996. ble, and small changes ({40Њ) in the interplanar angle (u)

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Section: Purification Of Bile Salts and Ucbmentioning

confidence: 99%

Section: Purification Of Bile Salts and Ucbmentioning

confidence: 99%

New concepts in bilirubin and jaundice: Report of the Third International Bilirubin Workshop, April 6-8, 1995, Trieste, Italy

Tiribelli

Ostrow

1996

Hepatology

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“…This paper examines the role of counterions in determining the properties of micelles formed by 1-methyl-4-n-dodecylpyridinium surfactants (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17). These properties include the cmc, the degree of counterion binding, and the degree of penetration of aromatic counterions between the headgroups.…”

Section: Introductionmentioning

confidence: 99%

Effect of Counterions on Properties of Micelles Formed by Alkylpyridinium Surfactants. 1. Conductometry and ¹H-NMR Chemical Shifts

1997

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This paper delineates the influence of counterions on the aggregation behavior of 1-methyl-4-ndodecylpyridinium surfactants, using conductometry and 1 H-NMR spectroscopy. Three types of counterions have been studied: (i) halides, (ii) alkanesulfonates, and (iii) aromatic counterions. The critical micelle concentration is found to decrease with increasing counterion size and increasing counterion hydrophobicity, whereas the degree of counterion binding increases. The aggregation behavior of 1-methyl-4-ndodecylpyridinium surfactants with aromatic counterions is shown to be markedly dependent on the substituent (hydrophobicity) and the substitution pattern in the aromatic ring of the counterion. Depending on the molecular architecture of the aromatic counterion, extremely long wormlike micelles can be formed instead of (nearly) spherical micelles. NMR experiments revealed that all aromatic counterions intercalate in between the pyridinium headgroups of the micelles, with more or less the same degree of penetration. All results can be explained on the basis of counterion-surfactant and counterion-water interactions, taking into account the specific microenvironment in the Stern layer.

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“…Samples were used within several hours of preparation to minimize hydrolysis of SDS into dodecanol (48). Solution was placed into the aluminum sample holder (Fig.…”

mentioning

confidence: 99%

“…1B), a microbutton was then deposited onto the surface, and ζ R * was measured (f = 1 Hz, Δθ 0 ∼ 0.05 rad) over time to allow for adsorption equilibration ( Fig. 2A) (48,50,51). Fig.…”

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confidence: 99%

Surface shear inviscidity of soluble surfactants

Zell

Nowbahar

Mansard

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

113

123

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Foam and emulsion stability has long been believed to correlate with the surface shear viscosity of the surfactant used to stabilize them. Many subtleties arise in interpreting surface shear viscosity measurements, however, and correlations do not necessarily indicate causation. Using a sensitive technique designed to excite purely surface shear deformations, we make the most sensitive and precise measurements to date of the surface shear viscosity of a variety of soluble surfactants, focusing on SDS in particular. Our measurements reveal the surface shear viscosity of SDS to be below the sensitivity limit of our technique, giving an upper bound of order 0.01 μN·s/m. This conflicts directly with almost all previous studies, which reported values up to 10 3 -10 4 times higher. Multiple control and complementary measurements confirm this result, including direct visualization of monolayer deformation, for SDS and a wide variety of soluble polymeric, ionic, and nonionic surfactants of high-and low-foaming character. No soluble, small-molecule surfactant was found to have a measurable surface shear viscosity, which seriously undermines most support for any correlation between foam stability and surface shear rheology of soluble surfactants.S urfactants facilitate the formation of foams and emulsions by reducing surface tension, thereby lowering the energy required to create excess surface area (1-3). These multiphase materials, however, are thermodynamically unstable, and coarsen through bubble or drop coalescence, as well as diffusive exchange between bubbles or drops (1, 4-6). Surfactants can additionally be used to control this coarsening rate, with effective foaming surfactants retarding coalescence, and defoamers speeding it. For example, coalescence may be slowed by repulsive forces between the surfactant monolayers adsorbed to either side of the (continuous) phase separating bubbles or drops. Ionic surfactants, for example, introduce electrostatic repulsions (1, 2, 5), whereas nonionic surfactants (e.g., polymers, proteins, or particles) provide steric barriers against coalescence (7-9). Moreover, Marangoni stresses arise when compressional or dilatational deformations drive gradients in surfactant concentration (and thus surface tension). The resulting dilatational surface elasticity resists surface area changes, slowing drainage and rupture of the thin fluid films between adjacent bubbles (4, 5, 10-13).Additionally, surfactant monolayers may exhibit nontrivial rheological responses. For example, the surface shear viscosity η S gives the excess viscosity associated with shearing deformations within the 2D surfactant monolayer. Because surfactant interfaces are inherently compressible, they may exhibit a surface dilatational viscoelasticity η D *, in addition to η S *, even under small-amplitude deformations. This contrasts with incompressible Newtonian liquids, which are well-described by a single scalar viscosity. Moreover, surface shear and dilatational viscosities need not have equal (14), or even compara...

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Surface tension of solutions of pure sodium dodecyl sulfate

Abstract: perature increases and the phase boundary is approached.

Cited by 261 publications

References 5 publications

New concepts in bilirubin and jaundice: Report of the Third International Bilirubin Workshop, April 6-8, 1995, Trieste, Italy

New concepts in bilirubin and jaundice: Report of the Third International Bilirubin Workshop, April 6-8, 1995, Trieste, Italy

Effect of Counterions on Properties of Micelles Formed by Alkylpyridinium Surfactants. 1. Conductometry and ¹H-NMR Chemical Shifts

Surface shear inviscidity of soluble surfactants

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Surface tension of solutions of pure sodium dodecyl sulfate

Abstract: perature increases and the phase boundary is approached.

Cited by 261 publications

References 5 publications

New concepts in bilirubin and jaundice: Report of the Third International Bilirubin Workshop, April 6-8, 1995, Trieste, Italy

New concepts in bilirubin and jaundice: Report of the Third International Bilirubin Workshop, April 6-8, 1995, Trieste, Italy

Effect of Counterions on Properties of Micelles Formed by Alkylpyridinium Surfactants. 1. Conductometry and 1H-NMR Chemical Shifts

Surface shear inviscidity of soluble surfactants

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Product

Resources

About

Effect of Counterions on Properties of Micelles Formed by Alkylpyridinium Surfactants. 1. Conductometry and ¹H-NMR Chemical Shifts