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  • 1
    Electronic Resource
    Electronic Resource
    Rheology of Cetyltrimethylammonium Tosylate-Water System. 1. Relation to Phase Behavior (1995)
    s.l. : American Chemical Society
    Langmuir 11 (1995), S. 3337-3346 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00009a013
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  • 2
    Electronic Resource
    Electronic Resource
    The aggregation of aqueous dodecylphosphonic acid in dodecyltrimethylammonium hydroxide mixtures (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 669-677 
    Details
    ISSN: 1435-1536
    Keywords: Dodecanephosphonic acid ; dodecyltrimethylammonium hydroxide ; mixed micelles ; critical micelle concentration ; aggregation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The aggregation of aqueous dodecylphosphonic acid (DPA) and dodecyltrimethylammonium hydroxide (DTAOH) mixtures was studied by several methods. The behavior of DPA-rich mixtures is close to that of pure DPA. This is probably due to the preservation of the hydrogen-bonded structure of the micellar headgroup layer. The behavior is almost ideal. Betweeny DPA =0.5 and 0.33 (y DPA being the mole fraction of DPA in the surfactant mixture), the hydrogen-bonded structure of the micellar headgroup layer is destroyed. A sort of “micellar azeotrope” is formed, and the maximum of non-ideal interaction between the two surfactants is attained aty DPA =0.4. Fory DPA 〈0.33 the system behaves as a common mixture of a cationic surfactant and a non-ionic one (DPA.2LTA). There is a phenomenon of counterion “condensation” on aggregates at concentrations over the CMC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653066
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on styrene phosphonic acid (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 741-746 
    Details
    ISSN: 1435-1536
    Keywords: Styrene phosphonic acidcrystals ; micelle solubilization ; solubility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Some properties of styrene phosphonic acid (SPA) were studied. The crystals were triclinic, witha=0.6434 nm,b=0.5842 nm,c=2.0338 nm, α=96.17°, β=97.33°, γ=79.65° andZ=4. SPA underwent a change in crystal structure at 78.8°C, the hydrocarbon network became disordered (“liquid-like”) at 138.5°C. Crystals melted at 148.6°C giving a cubic mesophase, then changed to an isotropic liquid at 155.6°C and at 162.13°C SPA underwent decomposition. Values for pK1=2.15 and pK2=7.66 were obtained at 25°C. The water solubility of SPA at several temperatures, and its interaction with surfactant micelles were determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654669
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  • 4
    Electronic Resource
    Electronic Resource
    The aggregation in dodecyltrimethylammonium hydroxide aqueous solutions (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 959-966 
    Details
    ISSN: 1435-1536
    Keywords: Hydroxide surfactants ; critical micelle concentration ; aggregation ; cationic surfactants ; micelle charge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The aggregation of dodecyltrimethylammonium hydroxide (DTAOH) aqueous solutions has been studied by several methods. It is stepwise and four critical points were found. AtC T=(2.51±0.10)×10−4 mol · dm−3 the surface excess becomes zero, atC T=(1.300±0.041)×10−3 mol · dm−3 small aggregates from, which grow with concentration. AtC T=(1.108±0.010)×10−2 mol · dm−3 true micelles form (CMC) and at (3.02±0.28)×10−2 mol · dm−3 the structure of micelles probably changes affecting their properties. The DTAOH micelles are highly ionized (α=0.8) at the CMC, and decreases to reach very small values when the total concentration increases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00660374
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of NaOH and NaCl on the disodiumn-decane phosphonate micellar aggregation number (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 288-292 
    Details
    ISSN: 1435-1536
    Keywords: Disodiumn-decane phosphonate ; rodlike micelles ; diffusion coefficients ; polarography ; micelle size
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The diffusion coefficient of disodiumn-decane phosphonate micelles was studied by polarography at 25°C in NaCl and in NaOH solutions, and the size and aggregation number of the micelles was computed as a function of Na+ concentration. All other conditions being equal, the addition of NaCl produces micelles with an aggregation number one order of magnitude larger than the NaOH addition. This is due to the increase of the effective charge per micellized head group produced by the reaction of OH- with the hydrolized head groups which are mainly present as-PO3H- in the micellar Stern layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657836
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of NaOH on dodecyltrimethylammonium hydroxide aggregation in aqueous solutions (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 854-859 
    Details
    ISSN: 1435-1536
    Keywords: Hydroxide surfactants ; critical micelle concentration ; aggregation ; cationic surfactants ; counterion effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The aggregation of dodecyltrimethylammonium hydroxide (DTAOH) in aqueous NaOH solutions was studied as a function of NaOH concentration. As in NaOH-free DTAOH aqueous solutions, the surfactant underwent a stepwise aggregation mechanism. Changes in the structure of aggregates produced an increase of the concentration at which premicellar aggregates could solubilize hydrophobic dyes and also in the concentration at which hydroxide inons join the aggregates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654743
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  • 7
    Electronic Resource
    Electronic Resource
    Styrene solubilization in micelles of dodecyltrimethylammonium hydroxide (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 604-607 
    Details
    ISSN: 1435-1536
    Keywords: Key words Solubilization ; hydroxide surfactants ; styrene ; monomers ; micelles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The solubilization of styrene molecules in aqueous dodeciltrimethylammonium Hydroxide (DTAOH) solution was studied by UV-Vis spectroscopy. In short, fully ionized DTAOH aggregates the styrene molecules in the micelle double layer, oriented with their vinyl group to the micelle core and the aryl ring to the intermicellar solution. At increased surfactant concentration, when the aggregates incorporate counterions in their Stern layer, the orientation is maintained, but styrene molecules gradually penetrate into the micelle core as the micelle size and degree of counterion union increased, until they were completely immersed in the hydrocarbon core of rod-like micelles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050125
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of surfactant charge on micellization behavior (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 754-759 
    Details
    ISSN: 1435-1536
    Keywords: Key words Micelle charge ; alkanephosphonates ; cmc ; micellization ; micelle composition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The influence of the surfactant charge on micellization was studied on sodium n-dodecane-phosphonates, varying the charge of the surfactant ion from 0 to 2. The effects on the cmc, hydrolysis, micelle composition, and micelle ionization degree were studied. The increase of one e unit in the charge of the surfactant species reduces the cmc by about one order of magnitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050144
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  • 9
    Electronic Resource
    Electronic Resource
    The interface air/water of n-dodecanephosphonic acid solutions (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 52-58 
    Details
    ISSN: 1435-1536
    Keywords: Key words Dodecanephosphonic acid ; soluble monolayer ; air/water interface ; evaporation ; adsorption ; ion-selective electrodes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The air/water interface of the system n-dodecanephosphonic acid (H2DP)–water was studied by surface tension, ion-selective electrodes and evaporation in an electrobalance. The combination of surface tension and ion-selective electrodes measurements enables to study the adsorption of soluble surfactants above the cmc using the Gibbs’ equation. H2DP formed a nonideal monolayer at the air/water interface with A molec=0.995 nm2 below the cmc. Above the cmc there was a reduction in adsorption giving A molec=6.32 nm2, which remained almost constant in the explored concentration range. This adsorption reduction may be due to a change composition on micellization, or to a thermodynamic advantage of micellization on adsorption. The reduction in the evaporation rate of water was mainly due to the reduction of the water activity, caused by the presence of solutes in bulk. This is because the strong changes in the surface coverage did not have significant influence on the evaporation rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050208
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  • 10
    Electronic Resource
    Electronic Resource
    Partial molar volume of dodecyltrimethylammonium hydroxide in water and NaOH aqueous solutions (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 738-742 
    Details
    ISSN: 1435-1536
    Keywords: Key words Hydroxide surfactants ; micelles ; partial molar volume ; Dodecyltrimethylammonium hydroxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The partial molar volume of dodecyltrimethylammonium hydroxide in water and aqueous NaOH solutions was measured. The addition of NaOH did not affect either the micellized or the unmicellized molecules. The expansion on micellization is much larger than in dodecyltrimethylammonium bromide systems, which reflects the stronger ionization of the hydroxide surfactant micelles, when compared with that of the bromide amphiphile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050304
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