Structural organization of cetyltrimethylammonium sulfate in aqueous solution: The effect of Na2SO4

Feitosa, Eloi; Brazolin, Marcelo Rodrigo Savério; Naal, Rose Mary Zumstein Georgetto; Lama, Maria Perpetua Freire de Morais Del; Lopes, Josias R.; Loh, Watson; Vasilescu, Marilena

doi:10.1016/j.jcis.2006.02.051

Cited by 58 publications

(44 citation statements)

References 23 publications

(40 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Once the total concentration of the surfactant in the reaction cell reaches cmc, a sharp change in the heat of injection is observed. At the end of the experiment, the enthalpy change is solely the result of micelle dilution without breaking down the micelles [21]. The difference between the enthalpy before and after micellization gives the enthalpy of demicellization process, DH demic .…”

Section: Itc Resultsmentioning

confidence: 99%

Thermodynamics, size, and dynamics of zwitterionic dodecylphosphocholine and anionic sodium dodecyl sulfate mixed micelles

Sikorska

Wyrzykowski

Szutkowski

et al. 2015

J Therm Anal Calorim

View full text Add to dashboard Cite

The thermodynamic properties of micellization for dodecylphosphocholine (DPC), sodium dodecyl sulfate (SDS), and their mixtures were studied using isothermal titration calorimetry. NMR relaxation measurements were used to explore molecular mobility of the DPC-containing micelles, whereas the diffusion measurements were taken to determine the micelle size. The DPC/SDS mixed systems reveal a tendency to form two kinds of micelles in buffered solution at lower temperatures. An increase in temperature as well as the transfer of the DPC/SDS mixed micelles from buffered to unbuffered solution results in only a single-step micellization process. The average size of the DPC-containing micelles is only slightly dependent on the SDS fraction. Examination of the data of spin-spin relaxation (T 2 ) shows that methylene protons on the polar headgroup of DPC and methylene protons (H1) on the hydrocarbon chain in the micellar systems studied reveal a heterogeneous dynamic behavior reflected in a twocomponent T 2 relaxation in the whole temperature range. The latter is the main constituent of the rigid interfacial layer core protecting the penetration of water into the hydrophobic interior.

show abstract

Section: Itc Resultsmentioning

confidence: 99%

Thermodynamics, size, and dynamics of zwitterionic dodecylphosphocholine and anionic sodium dodecyl sulfate mixed micelles

Sikorska

Wyrzykowski

Szutkowski

et al. 2015

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…Comparing the effect of the presence of porphyrin in the G 0 m is worth noticing that the stability of C 12 TAB micelles is not affected by the presence of porphyrin, whilst for C 16 Since the variation of H 0 m results from the sum of different interactions, such as chain dehydration for micelle formation, hydrophobic interactions between the hydrocarbon chains, ionic interactions between the head ionic groups and counterions, etc., it is difficult, and somewhat speculative, to try to assign accurately the factors responsible for such variations. However, we can hypothesize that the screening of the electrostatic interactions as a consequence of the presence of H 2 TPPS 4− monomers in solution, reduces the enthalpy of micellization, i.e., favoring C n TAB micelle formation [38]. Table 3.…”

Section: Thermodynamic Parameters Of Micellizationmentioning

confidence: 99%

Interactions between cationic surfactants and 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin tetrasodium salt as seen by electric conductometry and spectroscopic techniques

Carmona

Piñeiro

Monteiro

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

“…Unlike steadystate fluorescence measurements taking advantage of conventional spectrophotometers, this method requires the application of single-photon counting equipment and analysis by appropriate non-linear fitting software. Utilisation of time-resolved fluorescence quenching resulted in the determination of micelle aggregation number of conventional surfactants such as DTAB [13,30], cetyltrimethylammonium bromide (CTAB) [31,32], SDS [16,33,34], sodium lauryl ether sulfate [35].…”

Section: Introductionmentioning

confidence: 99%

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

2015

View full text Add to dashboard Cite

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.

show abstract

Structural organization of cetyltrimethylammonium sulfate in aqueous solution: The effect of Na2SO4

Cited by 58 publications

References 23 publications

Thermodynamics, size, and dynamics of zwitterionic dodecylphosphocholine and anionic sodium dodecyl sulfate mixed micelles

Thermodynamics, size, and dynamics of zwitterionic dodecylphosphocholine and anionic sodium dodecyl sulfate mixed micelles

Interactions between cationic surfactants and 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin tetrasodium salt as seen by electric conductometry and spectroscopic techniques

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

Contact Info

Product

Resources

About