Rodlike micelles of sodium dodecyl sulfate in concentrated sodium halide solutions

Ikeda, Shôichi; Hayashi, Shoji; Imae, Toyoko

doi:10.1021/j150601a024

Cited by 128 publications

(70 citation statements)

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“…48 We can therefore expect an increase of micelle size when using Ca 2+ instead of K + in combination with CTAB. In order to obtain further information regarding the substantial differences between the samples prepared with CTAB/KCl and CTAB/CaCl 2 , we have conducted XRD measurements.…”

Section: Introductionmentioning

confidence: 98%

Tuning the aspect ratio of arrays of silica nanochannels

Zucchetto

Brühwiler

2015

RSC Adv.

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Arrays of silica nanochannels (ASNCs) are ordered mesoporous silica particles with hexagonal prismatic shape. The entrances of the well-defined one-dimensional nanochannels are located on the base surfaces of the hexagonal prisms. The aspect ratio of the micrometer-sized particles (length-to-diameter ratio) can be tuned in the range of 0.8 to 2.2 by the addition of co-ions (K + and Ca 2+ ) to the hexadecyltrimethylammonium bromide (CTAB) templated synthesis and by an adjustment of the relative amounts of silica precursor (tetraethoxysilane) and CTAB. The length of the nanochannels can be varied between 2 and 9 µm. Co-ions thereby not only improve the regularity of the hexagonal prismatic particle shape, but also affect the diameter of the nanochannels, which lies at approximately 2.6 nm (with K + as co-ion) and 3.2 nm (with Ca 2+ as co-ion).

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Section: Introductionmentioning

confidence: 98%

Tuning the aspect ratio of arrays of silica nanochannels

Zucchetto

Brühwiler

2015

RSC Adv.

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“…The utilisation of this method for the aggregation number determination is rather complicated as it requires the independent determination of refractive index increment of the measured surfactant solution and the extrapolation of the data to the CMC which does not allow measurement of the concentration dependence of the aggregation number. Using this method, micelle aggregation numbers of some conventional singlechain ionic surfactants were determined at different solution ionic strength as published in the papers of Imae and Ikeda -dodecyltrimethylammonium bromide (DTAB) [17], dodecyldimethylammonium bromide [18] and chloride [19], dodecylpyridinium bromide [20], tetradecyltrimethylammonium halides [21], sodium dodecyl sulfate (SDS) [22,23]. Small angle neutron scattering data permit the determination of the average charge of micelles, the average micelle aggregation number [24] as well as providing information on the micelle shape.…”

Section: Introductionmentioning

confidence: 99%

Determination of micelle aggregation numbers of alkyltrimethylammonium bromide and sodium dodecyl sulfate surfactants using time-resolved fluorescence quenching

2015

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Abstract:The time-resolved fluorescence quenching method was applied to determine the micelle aggregation number of cationic single-chain surfactants dodecyltrimethylammonium bromide (DTAB), cetyltrimethylammonium bromide (CTAB) and anionic surfactant sodium dodecyl sulfate (SDS). The concentration dependence of micelle aggregation number was found to be linear for all investigated surfactants in the concentration range 2-15 × the value of critical micelle concentration of the respective surfactant. The values of micelle aggregation number were found in the range 30-77. Different trends in the linear concentration dependence of micelle aggregation number were observed for cationic surfactants and for the anionic surfactant SDS. A small slope value was found for cationic surfactants, while the SDS micelle aggregation number concentration dependence showed significantly a larger slope value. The aggregation number increase with the increasing SDS concentration results in the micellar growth. Results from a simple analysis based on computer models of cationic and anionic surfactant molecules with dodecyl chains supports, the formation of intramicellar hydrogen bonding between surfactant molecules in SDS micelle shell.

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“…This trajectory was long enough to observe the self-assembling of monomers, and therefore, it is possible to compare the sizes, geometries and number of these micellar aggregations with experimental data and other works of molecular dynamic simulations. Although, the SDS micelle has been extensively studied, 26,27,[30][31][32][33][34][35][36][37] to the best of our knowledge this is the first time that a microsecond trajectory has been calculated, allowing the spontaneous SDS micellization to be observed. Therefore, as will be discussed, the trajectory obtained shown details of the micellar formation not revealed by experimental data, once the measured results are an average over all aggregates.…”

Section: Introductionmentioning

confidence: 99%

Investigating the spontaneous formation of SDS micelle in aqueous solution using a coarse-grained force field

Pires¹,

Moura²,

Freitas³

2012

Quím. Nova

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Recebido em 19/8/11; aceito em 5/12/11; publicado na web em 31/1/12 A 1µs Molecular Dynamic simulation was performed with a realistic model system of Sodium Dodecyl Sulfate (SDS) micelles in aqueous solution, comprising of 360 DS -, 360 Na + and 90000 water particles. After 300 ns three different micellar shapes and sizes 41, 68 and 95 monomers, were observed. The process led to stabilization in the total number of SDS clusters and an increase in the micellar radius to 2.23 nm, in agreement with experimental results. An important conclusion, is be aware that simulations employed in one aggregate, should be considered as a constraint. Size and shape distribution must be analyzed.

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Rodlike micelles of sodium dodecyl sulfate in concentrated sodium halide solutions

Cited by 128 publications

References 0 publications

Tuning the aspect ratio of arrays of silica nanochannels

Tuning the aspect ratio of arrays of silica nanochannels

Determination of micelle aggregation numbers of alkyltrimethylammonium bromide and sodium dodecyl sulfate surfactants using time-resolved fluorescence quenching

Investigating the spontaneous formation of SDS micelle in aqueous solution using a coarse-grained force field

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