Aqueous Solutions Of Sodium Dodecylbenzene Sulfonate Research Articles

Correlation between biological activity and physicochemical properties of sodium dodecylbenzenesulfonate in aqueous solutions

The purpose of this study was to establish a correlation between the effect of the pollutant content on the dimensional and physicochemical characteristics of the investigated solutions and its effect on aquatic organisms. To this end, the surface tension, electrical conductivity, pH, and redox potential of aqueous solutions of sodium dodecylbenzenesulfonate were measured in a wide concentration range (10–710–2 М). The change in the size and number of optical inhomogeneities was investigated using the small-angle reflection method in the micron range. In addition, the behavior of aquatic biological objects (Daphnia Magna) was studied in the investigated solutions. It was shown that the investigated concentration dependences (including the behavior of biological objects) are non-linear: they have either a stepped character or clearly expressed extremes and are well correlated with each other. A comfortable concentration range of sodium dodecylbenzenesulfonate for daphnia (all daphnia are active within 58 hours of the experiment) was established (0.018–0.037 mM). The correlation and nature of the concentration dependences indicate that at critical concentrations, structural rearrangements occur in sodium dodecylbenzenesulfonate solutions, not only the formation of micelles and pre-micelles, but also structural rearrangements of the solvent (water) itself. Thus, it has been experimentally shown that the change in the structure of water during interaction with pollutants can significantly affect both the physicochemical properties of aqueous solutions and the behavior of aquatic biological objects.

Optical fiber optofluidic laser based on surfactant solubilization of rhodamine B gain in an aqueous solution.

We report a whispering gallery mode (WGM)-based fiber optofluidic laser (FOFL), in which rhodamine B (RhB) in an aqueous surfactant solution of sodium dodecylbenzene sulfonate (SDBS) is used as the laser gain medium. Here, the role of SDBS is to scatter the RhB dye molecules to effectively prevent its self-association in the aqueous solution. Therefore, the fluorescence quantum yield of the used RhB dye is improved due to the enhanced solubilization, which results in a low lasing threshold of ∼2.2 µJ/mm2 when the concentration of SDBS aqueous solution reaches up to 20 mM, on par with or even better than most of the optofluidic dye lasers using RhB as the gain medium in an organic solution. We then establish a model of solubilization capacity of SDBS micelles, which successfully addresses the mechanisms of dye-surfactant interactions in the proposed FOFL system. We further apply this FOFL platform to the case of concentration sensing of the used SDBS, which exhibits a 2-order-of-magnitude improvement in sensitivity compared to the fluorescence measurement due to the signal amplification inherent to the lasing process. The proposed FOFL platform in combination with surfactant solubilization gain medium in an aqueous solution promises to enable chip-scale coherent light sources for various environmental and bio-chemical sensing applications.

Fabrication of polyamide 6 nanocomposites reinforced by the exfoliated graphene

ABSTRACT In this study, a green and efficient method was demonstrated to produce few-layer graphene (FLG) with high quality and yield via liquid-phase exfoliation (LPE) of graphite in sodium dodecyl benzenesulfonate aqueous solution by sonication. The final concentration of the as-prepared graphene was 0.96 mg mL−1 with a lateral size of about 2 μm after 2 h of sonication exfoliation. In addition, the polyamide 6/the exfoliated graphene (PA6/EG) nanocomposites were successfully fabricated by melt-blending injection. The effects of loading of EG on the mechanical properties of PA6 composites were systematically investigated. A noticeable enhancement was achieved on the PA6/EG nanocomposites. Compared with pure PA6, when the loading of EG is only 0.3 wt-%, the significant tensile strength and Young's modulus were increased by 26.7 and 21.1%, respectively, of PA6/EG composites. This green and easy process provides a choice for the application of high-performance graphene-based polymer composites.

Study on the Phase Change Characteristics of Carbon-Based Nanofluids

In this study, carbon-based nanofluids (CBNFs) with the minimized carbon materials (MCMs) were prepared using a graphite powder-based heating and cooling processing method (GP-HCPM). In addition, sodium dodecyl benzenesulfonate (SDBS) was added as a dispersant to enhance the stability of the CBNFs. Two methods, one involving fixed heating and cooling rates and the other involving fixed heating and cooling temperatures, were used to measure and analyze the phase change characteristics of the CBNFs and SDBS aqueous solution in order to evaluate the feasibility of employing CBNFs as phase change materials (PCMs) for cold storage applications. Results revealed that SDBS reduced the thermal conductivity (k) and increased the viscosity (μ), density (ρ), and specific heat (cp) of the samples; the CBNFs tended to increase the k, μ, and ρ values but reduce the cp values of the samples, compared with water. Furthermore, the SDBS aqueous solution and CBNFs significantly reduced the contact angle of droplets, compared with water. Phase change experiments conducted for all samples revealed that the CBNF sample S4 demonstrated the greatest reduction ratios in onset nucleation time, solidification time, and subcooling degree (38.98%, 11.05%, and 35.41%, resp.); thus, S4 was determined to be the most suitable CBNF for use as a PCM in cold storage applications.

Kinetic study of hydrate formation for argon + TBAB + SDS aqueous solution system

In this communication, the effects of initial temperature and pressure, aqueous TBAB (tetra-n-butylammonium bromide) solution concentration, and sodium dodecyl benzene sulfonate (SDS) concentration on the kinetic behaviour of semi-clathrate hydrates of Ar+aqueous TBAB solutions were investigated. Kinetic experiments were performed in a high pressure equilibrium cell with an inner volume of approximately 40cm3 at initial temperatures of (281, 285 and 287.5)K and initial pressures of (6.1, 8.1 and 10.1)MPa. The results indicate that induction time decreases significantly with an increase in the initial pressure. However, the kinetic constant, and consumption of Ar during the semi-clathrate hydrate formation, increases. The same trends were detected with a decrease in the initial temperature, at a constant pressure. In addition, with an increase in the TBAB concentration, from 0.1 to 0.3mass fraction TBAB, the rate of semi-clathrate hydrate nucleation and consumption of Ar, increases during the hydrate formation, while the induction time decreases, significantly. The results therefore show a positive kinetic effect of TBAB on Ar hydrates which indicates that TBAB is a reliable promoter to increase the rate of argon hydrate formation. The results for the addition of SDS (at concentrations of 100, 200ppm) at initial temperatures of 285K and initial pressures of (6.1 and 8.1)MPa indicate that SDS increases the induction time of the semi-clathrate hydrate formation for the system of Ar+0.1mass fraction TBAB+0.9mass fraction water, but there is no systematic trend between induction times and the SDS concentrations for this system.

Enhanced adsorption of atrazine on a coal-based activated carbon modified with sodium dodecyl benzene sulfonate under microwave heating

Abstract The concentrations of sodium dodecyl benzene sulfonate (SDBS), modification time and temperature were considered to be the specific factors that influence the SDBS-modified coal-based activated carbon (SCACs). The superior properties of the SCACs were assessed through the adsorption amount of atrazine under same conditions. The adsorption capacity of optimal sample (SCAC-10) that the CAC was modified in 50 ml of 0.6 mmol/l SDBS aqueous solution for 10 min under microwave heating (MWH) is superior. Compared with the CAC sample, the acidic functional groups of the SCAC-10 sample were reduced, thereby resulting in the increasing pHpzc value, the pore volume and specific surface area, and the elemental analysis results exhibited the O/C ratio of the SCAC-10 sample decreased from 0.41 to 0.38, which is consistent with X-ray photoelectron spectroscopy analysis results. The kinetics of adsorption fitted with pseudo-second-order model perfectly, and the Langmuir model was suitable for the SCAC-10 samples with a maximum capacity of 222.22 mg/g. Results exhibited the modification of CAC by SDBS with MWH can effectively improve the adsorption capacity of the samples for atrazine.

Effects of SDS and SDBS on CO2Hydrate Formation, Induction Time, Storage Capacity and Stability at 274.15 K and 5.0 MPa

AbstractThe CO2 hydratetechnology is growing in relative to CO2 capture, storage and transportation processes. An experimental investigation on CO2 hydrate formation in case of SDS (Sodium dodecyl sulfate) and SDBS (Sodium dodecyl benzene sulfonate) with seven concentrationsi. e.0, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6 g/L was conducted at temperature of 274.15 K and initial pressure of 5.0 MPa. It was found that SDS and SDBS surfactants havelittleinfluence on the total moles of gas consumed in the stirred reactor. The induction time of CO2hydrate formation was approximately 35 minsinboth of 0.5 g/L SDS and 0.3 g/L SDBS solution,while that was 50 minsin pure water. Although the surfactantsreduced the CO2hydrate induction time significantly, they did not show clear influence on the gas storage capacities. The maximum gas storage capacities of CO2 hydrate in pure water, SDS and SDBS aqueous solutions are 89.62, 92.67, 92.62 V/VH, respectively. The difference in decomposition time of CO2 hydrate formed in pure water, SDS and SDBS solutions indicates that SDS and SDBScan greatly enhance the stability of CO2 hydrate.

Modeling of the chemical composition of DC atmospheric pressure air discharge plasma in contact with aqueous solutions of sodium dodecylbenzenesulfonate

The results of calculation of the chemical composition of plasma of the DC atmospheric pressure discharge in air in contact with aqueous solutions of sulfonol (C12H25C6H4SO3Na) in the concentration range of 0–10 g/L at a discharge current of 40 mA are presented. At modeling, the combined solution of Boltzmann equation for the electron gas, equations of vibrational kinetics for ground states of N2, O2, H2O, and NO molecules, equations of chemical kinetics and plasma conductivity equation were used. It was shown that sodium atoms appearing as a result of transfer processes from the liquid cathode affect the chemical composition of the plasma and the characteristics of the electron gas.

Remediation of nitrobenzene contaminated soil by combining surfactant enhanced soil washing and effluent oxidation with persulfate.

The combination of surfactant enhanced soil washing and degradation of nitrobenzene (NB) in effluent with persulfate was investigated to remediate NB contaminated soil. Aqueous solution of sodium dodecylbenzenesulfonate (SDBS, 24.0 mmol L-1) was used at a given mass ratio of solution to soil (20:1) to extract NB contaminated soil (47.3 mg kg-1), resulting in NB desorption removal efficient of 76.8%. The washing effluent was treated in Fe2+/persulfate and Fe2+/H2O2 systems successively. The degradation removal of NB was 97.9%, being much higher than that of SDBS (51.6%) with addition of 40.0 mmol L-1 Fe2+ and 40.0 mmol L-1 persulfate after 15 min reaction. The preferential degradation was related to the lone pair electron of generated SO4•−, which preferably removes electrons from aromatic parts of NB over long alkyl chains of SDBS through hydrogen abstraction reactions. No preferential degradation was observed in •OH based oxidation because of its hydrogen abstraction or addition mechanism. The sustained SDBS could be reused for washing the contaminated soil. The combination of the effective surfactant-enhanced washing and the preferential degradation of NB with Fe2+/persulfate provide a useful option to remediate NB contaminated soil.

Vesicle formed by N′‐dodecyl‐N,N‐dimethylacetamidine and tuned by CO2 and alkali

By dynamic light scattering (DLS) and transmission electron microscopy (TEM), it is shown that spherical vesicles are formed spontaneously in the mixed systems consisting of sodium dodecyl benzene sulfonate (SDBS) and N′‐dodecyl‐N,N‐dimethylacetamidinium bicarbonate (DAB). These vesicles can be successfully tuned by alkali, but not CO2‐switch due to the unsuitable pKa of DAB. In SDBS/DAB system, alkalinity increase can substantially expand the vesicle size in DAB‐rich zone, but same effect is indistinguishable in SDBS‐rich zone. Only DAB solution can also form vesicles when the solution pH is close to the pKa of DAB.Practical applications: The vesicles can be spontaneously formed by mixing DAB and SDBS aqueous solution at various concentrations and mole fractions. These vesicles can expand gradually as the solution pH increases. They can be used as pH‐response vesicles for application in drug‐delivery, size‐selective release, biochemical reactions, and so on.Mixing SDBS and DAB aqueous solution can spontaneously form vesicles at various concentration and mole fraction. The vesicles cannot be tuned by CO2/Ar stimuli. The pH increase by adding NaOH can expand the vesicle size in DAB‐rich zone, but the same effect is indistinguishable in SDBS‐rich zone.

Electrodeposition of poly(3,4-ethylenedioxythiophene) on a stainless steel wire for solid phase microextraction and GC determination of some esters with high boiling points

In this work, 3,4-ethylenedioxythiophene (EDOT) emulsion is prepared by ultrasonication agitation and poly(3,4-ethylenedioxythiophene) (PEDOT) coating is fabricated on a stainless steel wire by electrochemical method from a 0.10M sodium dodecylbenzenesulfonate aqueous solution containing EDOT. The coating is characterized by scanning electron microscopy and Fourier transform infrared spectrophotometry, and it presents cauliflower-like structure. When the resulted PEDOT/steel fiber is used for the headspace solid phase-microextraction of some esters (i.e. methyl anthranilate, dimethyl phthalate, ethyl-o-aminobenzoate, methyl laurate and diethyl phthalate) and their GC detection, the limits of detection (LOD) are ca. 7.8–31ngL−1 (S/N=3) and the linear ranges are 0.25–800μgL−1. The fiber shows high thermal stability (up to 320°C), good reproducibility and long lifetime (more than 183 times). It also has good chemical stability. After it is immersed in acid, alkali and dichloromethane for 4h its extraction efficiency remains almost unchanged. Besides esters the fiber also exhibits high extraction efficiency for alcohols and aromatic compounds.

Micellar solubilization of octan-1-ol in aqueous solutions of SDBS and TTAB

Speed of sound and density measurements of aqueous solutions of anionic surfactant, sodium dodecylbenzene sulfonate (SDBS) and cationic surfactant, tetradecyltrimethyl- ammonium bromide (TTAB) in the presence of octan-1-ol, have been measured as a function of concentration of surfactants (0.05 and 0.10) mol·kg−1 at T=(298.15, 303.15 and 308.15) K. From these measurements, the apparent molar volume (Φv) and isentropic compressibility (ks) of octan-1-ol have been computed. The standard partial molar volume (Φov) has been calculated for rationalizing various interactions in the studied solutions. 1H and 13C NMR chemical shift measurements in micelle solutions containing monohydric alcohols have also been carried out in order to interpret the preferential solubilization site of alcohol on the studied micellar systems. Further, FTIR studies suggest that the peak values of OH and –CC– stretching are considerable in hydrophobic alcohols. The results obtained are analyzed in terms of the solute–solvent interaction.

Surface Activity of a Mixed Aqueous Solution of Poly(6-dodecyl-2-(acrylamidomethoxy)-1,3,6,2-dioxaza borocane) and Sodium Dodecylbenzene Sulfonate

聚（2-丙烯酰胺甲基-6-十二烷基硼酸二乙醇胺酯）（PADB）是一类两亲性聚硼酸酯.本文通过表面张力法考察了不同相对分子质量的PADB水溶液的表面活性; 重点研究了PADB与十二烷基苯磺酸钠（SDBS）在0.5 mol.L-1 NaCl溶液中的相互作用,通过正规溶液理论,计算PADB/SDBS混合体系的胶束化参数,并与单体ADB/SDBS混合溶液体系进行了比较.结果表明,PADB相对分子质量可达1.5×104-3.5×104,随分子量增加,PADB水溶液中临界胶束浓度（cmc）增大,但cmc时的表面张力（γcmc）维持在31 mN.m-1左右（298 K）; 加入PADB后,SDBS溶液表面张力-浓度对数（γ-lgc）曲线出现两处转变点,即c1和c2点,但c1和c2皆小于纯SDBS溶液的临界胶束浓度（cmcSDBS）,临界胶束浓度（cmcSDBS），即c1〈c2〈cmcSDBS．PADB加入量越大，相对分子质量越低，SDBS溶液的表面活性越强．将聚硼酸酯PADB溶液视为特殊状态的单体ADB溶液，通过近似处理，计算得到PADB／SDBS混合胶束中相互作用参数βrn在-2．4到-4．7之间，活度系数f1m〈1，表明聚硼酸酯PADB与SDBS有较强的相互作用；当混合体系中PADB的ADB结构单元摩尔分数x1为0．47时，｜βm｜达到最大．相比于单体ADB／SDBS混合体系，当x1〈0．8时，PADB／SDBS混合体系｜βm｜值较大，相互作用更强；随x1增大，混合胶束中聚合物PADB的ADB结构单元摩尔分数x｜βm｜不断增加，但其值低于ADB／SDBS混合体系．

Thermodynamic Properties of Micellization of Sodium Dodecylbenzene Sulfonate in the Aqueous-Rich Region of 1-Pentanol and 1-Hexanol

Apparent molar volumes, Φv, and isentropic compressibilities, κs, of the aqueous solutions of anionic surfactant, sodium dodecylbenzene sulfonate (SDBS), have been derived from experimental densities, ρ, and speed of sound, u, data measured below 0.40 mol·kg−1 at T = (298.15, 303.15, 308.15, and 313.15) K using an Anton Paar densimeter (DSA-5000). Conductance measurements were also made for aqueous solutions of SDBS to obtain critical micelle concentration at the above temperatures. Apparent molar volumes and isentropic compressibilities of 1-pentanol and 1-hexanol dissolved in aqueous micellar solutions of SDBS were determined as a function of molalities of surfactant (0.05 and 0.1) mol·kg−1 and alcohols at T = (298.15 and 308.15) K. The standard partial molar volumes, Φov, and transfer volume, Φov(tr), have been calculated for rationalizing various interactions in the studied solutions. Viscosity measurements were made for the above-mentioned alcohols in aqueous solutions of SDBS to obtain relative visc...

Morphology and thermostability of polypyrrole prepared from SDBS aqueous solution

Polypyrrole (PPy) with microstructure was prepared in sodium dodecyl benzene sulfonate (SDBS) aqueous solution. The composition, morphology, structure and thermostability of the resulting PPy particles were collected by elemental analysis, scanning electron microscopy (SEM), fourier transformation infrared (FT-IR) spectra and differential thermal analysis (DTA). The yield and conductivity were also measured. Different preparation conditions including the concentration of the surfactant and the monomer, addition of acid or not and the kind of the oxidant were all investigated. The results showed there was an extrinsic relation between the morphology and the thermostability of the samples. Based on the relation, a possible mechanism was proposed that there might be two kinds of interaction between SDBS and PPy, i.e., inter- and intra-interaction.

Preparation of mesostructured barium sulfate and its application in methane activation

Barium sulfate with lamellar and tubular microstructure was developed through a surfactant templating route under different synthesis conditions. Lamellar barium sulfate was synthesized through direct combination of Ba 2+ and SO 4 2 − in an aqueous solution containing sodium dodecyl benzene sulfonate (SDBS). Agglomerate barium sulfate nanotubes were obtained by the reaction of Ba 2+ and CaSO 4 in the SDBS aqueous solution. Preparation of regular single barium sulfate nanotubes was achieved by the controlled hydrolysis of dimethyl sulfate in an aqueous solution containing Ba 2+ and SDBS. As revealed by transmission electron microscopy characterization, the tube wall thickness was 7–8 nm, and the inner diameter was about 6 nm. When such mesostructured barium sulfate was loaded with VOSO 4 and sulfuric acid (100%), it performed excellently in catalyzing oxidative conversion of methane to methanol using molecular oxygen. The conversion proceeded at a relatively lower temperature (under 250 °C) than over general solid catalysts, and the selectivity to methanol remained high when methane conversion increased to an acceptable level. When the reaction proceeded stably, the one-pass conversion of methane was about 30%, and the selectivity to methanol could reach 50%.

Swelling–shrinking hysteresis of poly(N‐isopropylacrylamide) gels in sodium dodecylbenzenesulfonate solutions

AbstractThe swelling and shrinking behaviors of a series of poly(N‐isopropylacrylamide) (PNIPA) hydrogels are studied in aqueous solutions of sodium dodecylbenzenesulfonate (SDBS). Between 0 and 3 mol % 2‐acrylamido‐2‐methylpropanesulfonic acid sodium salt (AMPS) is used as an ionic comonomer in the hydrogel synthesis. It is shown that the collapsed PNIPA gels in water at 52°C start to swell above a critical SDBS concentration in the external solution. This critical concentration decreases as the ionic group content of PNIPA gel increases. A comparison of the swelling and shrinking experiments in SDBS solutions indicates strong hysteresis behavior of PNIPA gels. A more diluted solution is required to make a swollen gel start to reshrink than to cause gel swelling. The results show strong attractive forces between the isopropyl groups of the PNIPA network and the DB groups of SDBS molecules. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 1228–1232, 2002

Mimic oil recovery with a SDBS–dodecane–silica gel system

The wettability of the solid powder of silica gel was determined via a modified Washburn equation expressed as contact angles. The interfacial tension ( γ) between the dodecane and the dilute sodium dodecyl benzene sulfonate (SDBS) aqueous solution was obtained using the spinning drop ( γ<10 mN m −1) or drop volume methods ( γ>10 mN m −1). Contact angle changes for SDBS aqueous solutions on the surface of a silica gel powder were studied. The average aggregation number of SDBS micelles in aqueous solution was determined using the fluorescence quenching method. The relationship between the wettability of the powder surface, the critical micelle concentration (CMC) of SDBS and the mimic oil recovery of the resident oil on the powder surface has been explored. It has been found that good residual oil recovery was achieved by surface wettability changes at the interfacial tensions around 4–5 mN m −1, which is far from the ‘ultra low’ condition (≤10 −3 mN m −1).

The effect of preparation temperature on the swelling behavior of poly (N-isopropylacrylamide) gels

The role of the preparation temperature of poly(N-isopropylacrylamide) (PNIPA) gels on their swelling behavior in water and in aqueous solutions of sodium dodecylbenzenesulfonate was investigated. PNIPA gels were prepared by free-radical crosslinking copolymerization of N-isopropylacrylamide and N,N'-methylene(bis) acrylamide in water at fixed monomer and crosslinker concentrations. The equilibrium swelling ratio of the gels increases first slightly up to about 20°C then rapidly with increasing gel preparation temperature. Magnitude of the collapse transition in water at 34°C becomes larger as the gel preparation temperature increases. Calculations indicate a decrease in the effective crosslink density of PNIPA gels with increasing preparation temperature. The gels prepared at temperatures higher then 20°C were heterogeneous consisting of highly crosslinked regions interconnected by the PNIPA chains.

Wettability, Oil Recovery, and Interfacial Tension with an SDBS–Dodecane–Kaolin System

The wettability of kaolin with SDBS (sodium dodecyl benzene sulfonate) aqueous solutions was measured by the Washburn equation expressed as contact angles. The contact angle changes for SDBS aqueous solutions on kaolin surface was studied. The interfacial tension between the SDBS solutions and n-dodecane was measured using both drop volume and spinning drop methods. Then the oil recovery of n-dodecane on the kaolin surface was tested. It was found that the minimum contact angle (the most hydrophilic condition) and the maximum oil recovery occurred near the critical micelle concentration (CMC) of SDBS while the interfacial tension between the SDBS solution and n-dodecane was far from ultra-low.