The binding equilibrium of sodium dodecyl sulfate to poly(ethylene oxide) in 0.1 M sodium chloride solution at 30°C

Shirahama, Keishiro

doi:10.1007/bf01566618

Cited by 124 publications

(81 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is evident that at low grafting densities the excluded volume interactions do not play a role in the degree of loading, the loading isotherm is Langmuir-like. This is in agreement with experimental binding isotherms of SDS on PEO in dilute bulk solutions, where the surfactant concentration determines the adsorption strength [21,30]. In Fig.…”

Section: Resultssupporting

confidence: 90%

“…In some studies the micelle size is concluded to be independent of the degree of complexation, in other a dependence is found [21,[30][31][32]. In the case of complexing colloidal particles (proteins) the dimensions of the particles are similar to those of adsorbed micelles and constant.…”

Section: Estimation Of Parametersmentioning

confidence: 99%

“…When the radius of curvature is significantly larger than the segment length, the curvature of the surface does not affect N ad , and N ad is proportional to the surface, i.e. N ad ϳ R p 2 , The number given in the literature for N ad for PEO-SDS varies between 60 and 120 [21,30]. It is also reported that in bulk there exists a critical length of approximately 100 segments for PEO, below which no complexation is found [35].…”

Section: Estimation Of Parametersmentioning

confidence: 99%

“…The behaviour of such necklaces in a dilute bulk phase has been extensively studied experimentally [20][21][22] and theoretically [24][25][26][27]. However, the interaction between densely grafted polymers and surfactants at a concentration above the CAC has not been considered.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Stuffed brushes: theory and experiment

Currie¹,

Gucht²,

Borisov³

et al. 1999

Pure and Applied Chemistry

View full text Add to dashboard Cite

Abstract:The interaction between polymer brushes and mesoscopic particles is investigated both theoretically and experimentally. We present an analytical mean-field theory for a polymer brush (a layer of long polymer chains end-grafted to a substrate) with varying excluded volume interactions between monomer units. This system mimics the reversible adsorption of mesoscopic particles, such as surfactant micelles or proteins, on the grafted chains. The equilibrium structural properties of the brush (the brush thickness and overall degree of complexation) as well as the number of adsorbed particles per unit area, ⌫, are analysed as functions of the affinity between particle and chain, grafting density and excluded volume interactions. In our model ⌫ is found to have a maximum as a function of . Experimentally the adsorption of BSA on a hydrophobic substrate with grafted PEO chains is measured with reflectometry. In the case of short grafted chains the adsorbed amount of BSA, ⌫, decreases continuously with increasing , which agrees with previous results and model calculations in the literature. In the case of long PEO chains, however, ⌫ is found to have a maximum as a function of . Qualitatively the experimental dependence of ⌫ on is found to agree with the results of our mean-field model. PEO chains show no affinity for BSA in the bulk, whereas in a grafted conformation an effective attraction is found. Some comments are made on the nature of this affinity, which is not yet fully understood.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Estimation Of Parametersmentioning

confidence: 99%

Section: Estimation Of Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stuffed brushes: theory and experiment

Currie¹,

Gucht²,

Borisov³

et al. 1999

Pure and Applied Chemistry

View full text Add to dashboard Cite

show abstract

“…Many experimental approaches have been used to study polymer -surfactant interactions such as turbidimetry [21,23], light scattering [26 -30], small-angle neutron scattering [35], electrophoretic light scattering [36,37], NMR [38], dialysis [26,39,40], surface tension [41 -44], viscometry [28,41], calorimetry [45], dye-solubilization [46,47], and solvatochromic studies [48], but relatively few techniques can be utilized to identify the phase transition and to clarify the dynamics of polyelectrolyte -micelle association. Static [28,30,49] and quasielastic [25,[27][28][29]49] light scattering especially have provided important information on the size and structure of polymermicelle complexes but soluble complexes can only be detected by QELS if their lifetime (residence time) is sufficiently long and the scattering intensity of the complexes is sufficiently large compared with those of the micelles and polymers from which they form.…”

Section: Introductionmentioning

confidence: 99%

Interactions of micelles with fluorescence-labeled polyelectrolytes

Morishima

Mizusaki

Yoshida

et al. 1999

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

Pyrene-labeled polyelectrolytes can be used to study the interaction between the polyelectrolyte and an oppositely charged micelle, if the micelle incorporates a fluorescence quencher. If the charge on the micelle is varied systematically, polymer-micelle complex formation can be observed at some well-defined micelle surface charge density. Applying a kinetic model to steady-state and time-dependent fluorescence quenching data, one can estimate the binding constant (K), association rate constant, and lifetime (residence time). K increases strongly with increase in micelle surface charge density (|) or decrease in ionic strength (v). These effects arise from the dependence of association rate constant and residence time on | and v. While these observations reflect the fundamental electrostatic nature of the interaction, it is also found that micelles preferentially bind to pyrene sites, so that complex formation results from the conjoint action of electrostatic and hydrophobic forces.

show abstract

Formation of emulsions in a screw loop reactor

Ludwig¹,

Flechtner

Prüß

et al. 1997

Chem Eng & Technol

View full text Add to dashboard Cite

The following article concerns emulsification reaction in a continuous screw loop reactor. The influence of hydrodynamics on the emulsification process as well as the influence of some specific substances were examined. We produced oil/water model emulsions under different test conditions and we determined the correlations between the mixing behavior of the reactor and the characteristic features of the obtained emulsion. Special consideration was given to the droplet size and its distribution. Variable operating conditions of the reactor are the residence time and the rotational speed of the screw, both of which have a decisive influence on the recycle factor and the number of passages through the rotor/stator system. In addition we determined the dependence of the obtained droplet size distribution on the viscosity of the continuous and dispersed phase, on the interfacial surface tension and on the phase proportions. The influence of the specific type of emulsifying agent and its concentration has been examined as well. The positive effect of the mixing and of the recirculation on the emulsification in the screw loop reactor was particularly evident with low emulsifier concentrations and with emulsifiers with slow adsorption kinetics. The established theories for emulsion formation (Kolmogoroff, Taylor) were used for a quantitative description of the experimental results. The screw loop reactor was compared to an agitated tank reactor and a toothed-ring dispersing machine (Ultra Turrax) based on the comminution energy which is produced per unit volume of emulsion. The agitated tank reactor produced only coarsely dispersed emulsions through the entire rotational speed range, whereas the screw loop reactor and the Ultra Turrax, particularly at high rotational speeds and, therefore, high power densities, showed a similar emulsification and produced much finer dispersed emulsions.Emulsions are used by industry in many different fields and in our daily life. Emulsions are mainly used in cosmetic products, plant protection, and by the foodstuff, washing and detergent industries. They also play an important role in the textile and plastics industries and for the extraction of mineral oil.On account of the many areas of application, there are a lot of different demands on user-specific emulsions with respect to the fineness, homogeneity, stability, and rheological features, which can often only be fulfilled by improvements on equipment and processes.

show abstract

The binding equilibrium of sodium dodecyl sulfate to poly(ethylene oxide) in 0.1 M sodium chloride solution at 30°C

Cited by 124 publications

References 21 publications

Stuffed brushes: theory and experiment

Stuffed brushes: theory and experiment

Interactions of micelles with fluorescence-labeled polyelectrolytes

Formation of emulsions in a screw loop reactor

Contact Info

Product

Resources

About