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  • 1
    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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    Paper (German National Licenses)
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  • 2
    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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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Evaporation and aggregation in aqueous monododecyltrimethylammonium n-dodecanephosphonate solutions (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 92-95 
    Details
    ISSN: 1435-1536
    Keywords: Key words Catanionic surfactants ; evaporation rate ; electrobalance ; premicelles ; dodecyltrimethylammonium n-dodecanephosphonates ; 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  Electrobalance evaporation rate measurements were used to measure solute weights in the aqueous catanionic system monododecyltri-methylammonium-n-dodecanephos-phonate. At very low concentration premicelles composed of ion pairs between 3.6 and 7 were found, which increased with concentration. Above the cmc the aggregates increased in size with concentration much more rapidly. Aggregates had 54 ion pairs at the higher studied concentration (6×10-3 mol dm-3). This value agrees with literature data of other similar systems. Since the system is probably polydisperse and the evaporation rate method gives number average weights, the true aggregation numbers are probably higher than those found. In this system the cmc did not indicate the starting point of aggregation, but a change in the aggregates structure and growing regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050214
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    Paper (German National Licenses)
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