Sodium dodecylsulfate in water

The cmc values of nDTMABr and SOS in water are in good agreement with literature values (26) our a values are slightly different from Evans for SDS (0.26 and 0.32 respectively) however, there is a 15 K temperature difference between the two experiments. Furthermore, Evans uses the transference number of the sodium ion at infinite dilution in his calculation. We have also determined a for sodium dodecylsulfate in water at 298.15 K. We found a = 0.24. Literature values range from 0.18 to 0.28 according to the physicochemical method used (27,28). 

Figure 4 Ternary phase diagram for the system methyl methacrylate (MMA)-acrylic acid (AA)-20 wt% solution of sodium dodecylsulfate in water (w/SDS)-ethylene glycol dimethacrylate (EGDMA) at 25 0.1°C and 1 atm. Compositions are on weight percent basis EGDMA content is 4% of the combined weight of MMA and AA. Domain A, two-phase region domain B, W/O microemulsion domain C, bicontinuous microemulsion domain D, OAV microemulsion. (From Ref 50.)...

SIL Silva, R.C. da, Loh, W., and Olofsson, G., Calorimetric investigation of temperature effect on the interaction between polyfethylene oxide) and sodium dodecylsulfate in water, Thermochimica Acta, 417,295,2004. 

The chemical polymerization of aniline at the interface between two immiscible solvents provides an attractive alternative route to PAn s. Such interfacial polymerization was first demonstrated in 1994 by Michaelson and McEvoy,82 who produced a freestanding PAn film at the interface between a solution of aniline/sodium dodecylsulfate in carbon tetrachloride and an aqueous oxidant solution containing ammonium persulfate/HCl. The analogous interfacial polymerization of a range of /V-alkylanilincs and o-alkylanilines using hexane and water phases for chemical oxidation with ammonium persulfate has also been briefly described.83... 

The phase diagrams of two quaternary mixtures made of sodium dodecylsulfate (SDS)-water-dodecane and hexanol (system A) or pentanol (system B) have been investigated in detail [22,23]. In both cases, sections of the three-dimensional diagram with constant water/surfactant ratio have been examined. These cuts were chosen because they allow a good description of the oil region and also because the water/SDS ratio, termed X in the following, fixes the size of the droplets in the inverse microemulsion phase and the thickness of the bilayers in the oil-rich lamellar phase. In the description of the quaternary mixtures, we emphasize the details of the evolution of the phase equilibria as X is varied. We have focused our attention not only on the characterization and the location of the boundaries of the various phases but also on the equilibria between the phases. 

A. Pan, B. Naskar, G. K. S. Prameela, B. V. N. Kumar, A. B. Mandal, S. C. Bhattacharya and S. P. Moulik, Amphiphile behavior in mixed solvent media I Self-aggregation and ion association of sodium dodecylsulfate in 1,4-diox-ane- water and methanol-water media. Langmuir 28,13830-13843 (2012). N. Patra and P. Krai, Controlled self-assembly of filled micelles on nanotubes. J.Am. Chem. Soc. 133,6146-6149 (2011). 

Criterion [44] is in agreement with the experiments of Watanabe et al. [48] on electrical emulsification of the system water + KCl in contact with a solution of sodium dodecylsulfate in methy-lisobutylketone. 

Distribution of benzodiazepines in system micellar pseudophase - water was investigated in micellar solutions of sodium dodecylsulfate. The protonization constants of benzodiazepines were determined by the UV-spectophotometry. Values of protonization constants increase with increasing of sodium dodecylsulfate concentration. The binding constants of two protolytic forms of benzodiazepines with a micellar pseudo-phase and P, values were evaluated from obtained dependence. 

The optimal conditions for the complexation were found. The luminescence of Tb " in (L ) complex was established to observed in a range of pH 2,0-11,0 with maximum at 7,0-7,5. The Tb (III) luminescence in complex with (L ) aslo depends on amount of reagents, solvent nature, amount of surfactants and trioctylphosphinoxide (TOPO). It was shown that introduction into the system Tb-L the 3-fold excess sodium dodecylsulfate (SDS) increases the luminescence intensity by 40 times and introduction into the system Tb-L the 3-fold excess TOPO increases the luminescence intensity by 25 times by the order value connecting with the crowding out of water molecules from the inner sphere of complexes. 

Sodiiun dodecylsulfate, cetyltrimethylam-monium chloride, sodium cholate, -cyclodextrin dansylated amino acids and polycyclic aromatic hydrocarbons > 45-fold 1% in water the greatest enhancement of fluorescence is that of sodium cholate on pyrene [263]... 

Data of Badder and Brooks (24). Figure 7 shows the comparisons of EPM with the experimental data obtained by Badder and Brooks (2A) in a CSTR (run C-24). The reactor feed contained 22.8% styrene, 0.64% emulsifier (sodium dodecylsulfate), and 0.39% initiator (ammonium persulfate). The residence time was 114 min. The initial reactor charge was water and emulsifier. In this case the size of the primary precursors was varied slightly from its baseline value of 1 nm to 0.8 nm. Although the experimental data show some scatter, EPM reproduces very well both the transient and steady state... 

The last, and less extensively studied field variable driving percolation effects is chemical potential. Salinity was examined in the seminal NMR self-diffusion paper of Clarkson et al. [12] as a component in brine, toluene, and SDS (sodium dodecylsulfate) microemulsions. Decreasing levels of salinity were found to be sufficient to drive the microemulsion microstructure from water-in-oil to irregular bicontinuous to oil-in-water. This paper was... 

Subsequently, cationic rhodium catalysts are also found to be effective for the regio- and stereoselective hydrosilation of alkynes in aqueous media. Recently, Oshima et al. reported a rhodium-catalyzed hydrosilylation of alkynes in an aqueous micellar system. A combination of [RhCl(nbd)]2 and bis-(diphenylphosphi no)propanc (dppp) were shown to be effective for the ( >selective hydrosilation in the presence of sodium dodecylsulfate (SDS), an anionic surfactant, in water.86 An anionic surfactant is essential for this ( )-selective hydrosilation, possibly because anionic micelles are helpful for the formation of a cationic rhodium species via dissociation of the Rh-Cl bond. For example, Triton X-100, a neutral surfactant, gave nonstereoselective hydrosilation whereas methyltrioctylammonium chloride, a cationic surfactant, resulted in none of the hydrosilation products. It was also found that the selectivity can be switched from E to Z in the presence of sodium iodide (Eq. 4.47). 

Toshima et al. obtained colloidal dispersions of platinum by hydrogen- and photo-reduction of chloroplatinic acid in an aqueous solution in the presence of various types of surfactants such as dodecyltrimethylammonium (DTAC) and sodium dodecylsulfate (SDS) [60]. The nanoparticles produced by hydrogen reduction are bigger and more widely distributed in size than those resulting from the photo-irradiation method. Hydrogenation of vinylacetate was chosen as a catalytic reaction to test the activity of these surfactant-stabilized colloids. The reaction was performed in water under atmospheric pressure of hydrogen at 30 °C. The photo-reduced colloidal platinum catalysts proved to be best in terms of activity, a fact explained by their higher surface area as a consequence of their smaller size. 

Anionic surfactants are present in surface water, resulting in serious environmental pollution. Therefore, adsorption of surfactants, such as sodium dodecylsulfate [155,156], on Mg/Al LDHs has received considerable attention. Ulibarri et al. also published the results of sorption of an anionic surfactant (sodium dodecylbenzenesulfonate) from water by LDHs and calcined samples (773 K), focusing both on their potential application as a sorbent and on the possibility of their recycling [154,157]. They found that anionic exchange was complete when the interlayer anion in the LDH precursor was Cl", reaching 100 % of AEG, and calcined LDH-carbonates were better adsorbents than those derived from LDH-chloride samples, however. It was also claimed that an increase in the crystallinity of the LDH samples probably leads to better ordered calcined mixed oxides, facilitating reconstruction of the layers and enlarging the absorption capacity. 

Fig. 6. Experimental data for system of Fig. 5(a), plotted and compared with calculation [Eq. (20)] on the basis of no interfacial resistance to the diffusion of acetic acid from water to benzene (37). Points are +, clean interface o, 0.00125 M pure sodium dodecylsulfate A, 0.00250 M pure sodium dodecylsulfate , 0.00250 M pure sodium dodecylsulfate- -2.4% lauryl alcohol -j-, spread protein , 5000 p.p.m. of sorbitan tetrastearate in the benzene. Units are q in moles c in moles liter and DtY in cm.

The increase in conductivity is due to increase in dissolved surfactant, and this increase continues until all the crystallites dissolve. The peak in specific conductance is attained when the microemulsion is formed and the specific conductance levels off. The plateau of Figure 6 is often referred to as a "percolation threshold" (] ) and is reached when there is a disordered interspersion capable of bicontinuous structures ( ). Further addition of methanol results in a lowering of conductivity explained by the solution eventually approaching the conductivity of methanol. This is the region of molecular dispersion. These conductivity curves are similar to those observed by Lagues and Santerey (13) on a system of water, cyclohexane, sodium dodecylsulfate and 1-pentanol. 

Recovery of only 20 % was observed in the separation of influenca virus components on a RP column (250x4.6 mm dG = 30 nm) with a water/acetonitrile gradient. The virus consists of three protein components with molar mass alues ranging from 28 to 55 kg/mol. After several runs, the column back pressure increased from 60 to 90 bars. Overnight treatment with 0.1 % sodium dodecylsulfate and 0.05 % TFA helped to regain approximately the initial permeability 67 ... 

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